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posted on 21 March 2017

March 20, 2017 Weather and Climate Report - Some Like it Hot

Written by Sig Silber

But there is still snow to be found. I don't want to be a travel agent but the Tahoe area in California looks to be getting a steady stream of new snow. NOAA (this is in jest) has sent out teams to find the elusive El Nino their dynamical models have divined but the only sightings so far are off Ecuador and Northern Peru. Soon perhaps a reward will be announced for the first confirmed El Nino sighting. Happy Astronomical Spring everyone!

weather.caption

First some housekeeping information. For those who want the forecasts beyond three months, we recently reported on the March 16 NOAA 15-Month Forecast and compared the first nine months of the NOAA Outlook with that of JAMSTEC in a special Update that you can get to by clicking here. More recently we provided an Update on the possible El Nino this Winter that many meteorological models are forecasting. We think it is implausible and our report can be accessed by clicking here. Remember if you leave this page to visit links provided in this article, you can return by hitting your "Back Arrow", usually top left corner of your screen just to the left of the URL box. We will of course publish a new 15 Month Update Report shortly after NOAA issues their update on April 20, 2017. But do not forget to review the current Update Report which to repeat is available by clicking here. You might find it very interesting.     

A. Focus on Alaska and CONUS (all U.S. except Hawaii)

First Let us focus on the Current (Right Now to 5 Days Out) Weather Situation.

Water Vapor.

This view of the past 24 hours provides a lot of insight as to what is happening.

Eastern Pacific Animation

Below is the same graphic as above but without the animation to show the current situation with respect to water vapor imagery for North America. It also covers more of CONUS.

 Water Vapor Imagery

Tonight, Monday evening March 20, 2017, as I am looking at the above graphic, we see zonal flow over the Northern Tier but entering CONUS a bit further south than usual.

Looking at the current activity of the Jet Stream.

Not all weather is controlled by the Jet Stream (which is a high altitude phenomenon) but it does play a major role in steering storm systems especially in the winter The sub-Jetstream level intensity winds shown by the vectors in this graphic are also very important in understanding the impacts north and south of the Jet Stream which is the higher-speed part of the wind circulation and is shown in gray on this map. In some cases however a Low-Pressure System becomes separated or "cut off" from the Jet Stream. In that case it's movements may be more difficult to predict until that disturbance is again recaptured by the Jet Stream. This usually is more significant for the lower half of CONUS with the cutoff lows being further south than the Jet Stream.

Current Jet Stream

One sees the current jet stream above. Notice the entry into CONUS along the West Coast. Also notice the Split Jet Stream but with the Southern Branch deep into Mexico. 

This graphic provides a good indication of where the moisture is. It is a bit different than just moisture imagery as it is quantitative.

 Center for Western Weather and Water Extremes, Scripps/UCSD.

You can convert the above graphic in to a flexible forecasting tool by clicking here.  One can obtain views of different geographical areas by clicking here.

Notice that right now we see moisture impacting the Northwest but not as significantly as in recent weeks. This graphic is about Atmospheric Rivers i.e. thick concentrated movements of water moisture.

More explanation can be found at Atmospheric Rivers (Click to read full Weather Underground Dr. Bob Henson article). For a more technical discussion this might be a good reference. The idea is that we have now concluded that moisture moves via narrow but deep channels in the atmosphere rather than being very spread out. This raises the potential for extreme precipitation events.

 60 Hour Forecast.

Here is a national animation of weather fronts and precipitation forecasts with four 6-hour projections of the conditions that will apply covering the next 24 hours and a second day of two 12-hour projections the second of which is the forecast for 48 hours out and to the extent it applies for 12 hours, this animation is intended to provide coverage out to 60 hours. Beyond 60 hours, additional maps are available at links provided below.

current highs and lows

The explanation for the coding used in these maps, i.e. the full legend, can be found here although it includes some symbols that are no longer shown in the graphic because they are implemented by color coding.

U.S.  3 Day to  7 Day Forecasts

Below is a graphic which highlights the forecasted surface Highs and the Lows re air pressure on Day 3. The Day 6 forecast can be found here.

Day 3 Weather Forecast

The Aleutian Low is as I look at this Day 3 forecast is a split Low with central air pressure for the portion over Kamchatka being 968 hPa and the weaker portion in the Gulf of Alaska having a central pressure of 996 hPa. Remember this is a forecast for Day 3 not the current situation. The average sea level air pressure in the winter is 1001 hPa and 994 hPa for a non-split Low. This graphic changes every six hours.
The High Pressure off of the West Coast, the familiar RRR, on Day 3 is back with a fairly weak surface air pressure of 1024 hPa.  Although weak, the pattern continues to direct storms from the Pacific into CONUS Northwest. It may even allow storms to enter CONUS further south i.e. California.
Notice the large Great Lakes High Pressure System with a central pressure of 1036 hPa. This could bring cold northerly winds to the Northeast.
I provided this  K - 12 write up that provides a simple explanation on the importance of semipermanent Highs and Lows and another link that discussed possible changes in the patterns of these highs and lows which could be related to a Climate Shift (cycle) in the Pacific or Global Warming. Remember this is a forecast for Day 3. It is not the current situation but Day 3 is not very far out.

Now looking at the 5 Day Jet Stream Forecast

Jet Stream Five Days Out .

You can see that moisture is forecast to continue to stream into the West Coast. One no longer sees the Southern Branch of the Mid-Latitude Jet Stream and some forecast that the Split Stream may resume being a non-split Jet Stream which may have to do with the MJO. But reports of the MJO resuming its Active Phase have been frequent and premature this winter. Remember this is a H3 view meaning a view at 30,000 feet which is about six miles high.

Putting the Jet Stream into Motion and Looking Forward a Few Days Also

To see how the pattern is projected to evolve,  please click here. In addition to the shaded areas which show an interpretation of the Jet Stream, one can also see the wind vectors (arrows) at the 300 Mb level.

This longer animation shows how the jet stream is crossing the Pacific and when it reaches the U.S. West Coast is going every which way.

When we discuss the jet stream and for other reasons, we often discuss different layers of the atmosphere. These are expressed in terms of the atmospheric pressure above that layer. It is kind of counter-intuitive to me. The below table may help the reader translate air pressure to the usual altitude and temperature one might expect at that level of air pressure. It is just an approximation but useful.

air pressure and altitude
Re the above, H8 is a frequently used abbreviation for the height of the 850 millibar level, H7 is the 700 mb level, H5 is the 500 mb level, H3 is the 300 mb level. So if you see those abbreviations in a weather forecast you will know what they are talking about.

Click here to gain access to a very flexible computer graphic. You can adjust what is being displayed by clicking on "earth" adjusting the parameters and then clicking again on "earth" to remove the menu. Right now it is set up to show the 500 hPa wind patterns which is the main way of looking at synoptic weather patterns. This amazing graphic covers North and South America. It could be included in the Worldwide weather forecast section of this report but it is useful here re understanding the wind circulation patterns.

You can enlarge the below daily (days 3 - 7) weather maps for CONUS by clicking on Day 3 or Day 4 or Day 5 or Day 6 or Day 7. These maps auto-update so whenever you click on them they will be forecast maps for the number of days in the future shown.

Short term forecasts

Here is the seven-day cumulative precipitation forecast. More information is available here.

Seven Day WPC Quantitative precipitation forecast

We see again a forecast for substantial precipitation along the Northern West Coast. There is also plenty of moisture in the Middle Rockies and the Eastern Half of CONUS. The graphic shows the cumulative precipitation over a seven-day period.

The map below is the mid-atmosphere 7-Day chart rather than the surface highs and lows and weather features. In some cases it provides a clearer less confusing picture as it shows only the major pressure gradients. This graphic auto-updates so when you look at it you will see NOAA's latest thinking. The speed at which these troughs and ridges travel across the nation will determine the timing of weather impacts. This graphic auto-updates I think every six hours and it changes a lot. Because "Thickness Lines" are shown by those green lines on this graphic, it is a good place to define "Thickness" and its uses. The 540 Level general signifies equal chances for snow at sea level locations. Remember that 540 relates to sea level.

7 Day 500 MB Geopotential Forecast

Thinking about clockwise movements around High Pressure Systems and counter- clockwise movements around Low Pressure Systems provides a lot of information.
What you can see in the above graphic is a deep trough impacting the Rocky Mountain States and a strong Ridge of High Pressure for the Great Lakes Area of CONUS.
Remember this is a forecast for Day 7. Note the 540 Thickness Line re the above discussion of thickness and snow likelihood. This week it looks like the 540 line will not impact CONUS other than where there are mountains.

 Four- Week Outlook

Census Bureau Regions and Sub-Regions are not always the best way to describe weather patterns but I am showing this map as I may sometimes use their terminology  to describe regions.

Census Bureau  Regions

I am going to show the three-month AMJ Outlook (for reference purposes), the Early Outlook for the single month of April,  the 6 - 10 Day and 8 - 14 Day Maps and the Week 3 -  4 Experimental Outlook. I use "EC" in my discussions although NOAA sometimes uses "EC" (Equal Chances) and sometimes uses "N" (Normal) to pretty much indicate the same thing although "N" may be more definitive.  

This is a transition week with the 6 - 14 Forecast covering more of March than April. In the past I often provided reference maps for the current and future Month and three-month period. I think that can create confusion and it may be that the April maps better represent late March than the previously issued March maps. So I am only providing the April and AMJ maps for reference.

First - Temperature

Here is the Three-Month AMJ Temperature Outlook issued on March 16, 2017:

AMJ 2017  Temperature Outlook Issued on March 16, 2017

Here is the Early Temperature Outlook for April issued on March 16, 2017

April Temperature Early Outlook Issued on March 16, 2017

6 - 10 Day Temperature Outlook issued today (Note the NOAA Level of Confidence in the Forecast Released on March 20, 2017 was 4 out of 5)

6 - 10 Day Temperature Outlook

8 - 14 Day Temperature Outlook issued today (Note the NOAA Level of Confidence in the Forecast Released on March 20, 2017 was 2 out of 5) 

8-14 Day Temperature Outlook

Looking further out.

Experimental Week 3-4 Temperature Outlook

Consolidation of 6 - 10, 8 - 14 and Experimental Week 3-4 Forecasts

(Interpreted on March 30, 2017

March 26 to April 3 April 1 to April 14

From Alaska to the CONUS Northwest, it starts cool but this cool anomaly slowly tracks south and east. Like last week, the Southern 2/3rds of CONUS starts warm but the warm anomaly tracks slowly to the east. In between the large warm anomaly and the Alaska and Northeast cool anomalies and the late developing California warm anomaly, it is EC.

The Northeast and Northwest are EC with a small cool anomaly embedded in the Northwest EC anomaly. Everywhere else it is warm. The transition to the pattern shown in the Week 3 - 4 Forecast from the pattern shown in the 8-14 Day forecast seems to be feasible.
Remember the Week 3-4 Experimental Outlook was issued last Friday and I am looking at the 6 - 10 and 8 - 14 day forecasts issued today i.e. Monday. So that explains the overlap of dates. Remember that the Week 3 - 4 Forecast covers two weeks so it can appear to not mesh perfectly but actually do so over the two-week period.

 

Now - Precipitation

Here is the three-month AMJ Precipitation Outlook issued on March 16, 2017

AMJ 2017 Precipitation Outlook Issued on March 16, 2016

And here is the Precipitation Early Outlook for April issued on March 16, 2017

April  2017  Early Precipitation Outlook Issued on March 16, 2017

6 - 10 Day Precipitation Outlook Issued Today (Note the NOAA Level of Confidence in the Forecast Released on March 20, 2017 was 4 out of 5)

6 - 10 Day Precipitation Outlook

8 - 14 Day Precipitation Outlook Issued Today (Note the NOAA Level of Confidence in the Forecast Released on March 20, 2013 was 2 out of 5)

Current 8 - 14 Day Precipitation Outlook

Looking further out.

Weeks 3 and 4 Experimental Forecast..

Consolidation of 6 - 10, 8 - 14, and Week 3-4 Forecasts

Interpreted on March 20, 2017

March 26 to April 3  April 1 to April 14, 2017
Alaska and the Panhandle start dry and gradually become wet from South to North. CONUS starts mostly wet except for Florida which is dry and the southern and western parts of the Southwest which are mostly EC except dry for parts of California. The wet area tends to expand south as the period unfolds. Between the wet and dry anomalies. it is EC.

2/3rds of CONUS are projected to be wet stretching east from a line that is just west of Montana and extends Southeast to Central Texas. It is dry in West Alaska and from California to West Texas. Between the wet and dry anomalies it is EC. The transition to the pattern shown in the Week 3 - 4 Forecast from the pattern shown in the 8-14 Day forecast seems to be feasible.

Remember the Week 3-4 Experimental Outlook was issued last Friday and I am looking at the 6 - 10 and 8 - 14 day forecasts issued today i.e. Monday. So that explains the overlap of dates. Remember that the Week 3 - 4 Forecast covers two weeks so it can appear to not mesh perfectly but actually do so over the two-week period.

 

Here is the NOAA discussion released today March 20, 2017.

6-10 DAY OUTLOOK FOR MAR 26 - 30 2017

TODAY'S DYNAMICAL MODEL SOLUTIONS ARE IN FAIRLY GOOD AGREEMENT ON THE 500-HPA CIRCULATION PATTERN PREDICTED OVER NORTH AMERICA. TROUGHS ARE EXPECTED OVER PARTS OF THE ALEUTIANS, THE WESTERN HALF OF THE CONUS, AND NEAR GREENLAND,  WHILE RIDGES ARE FORECAST OVER MUCH OF MAINLAND ALASKA, PARTS OF WESTERN CANADA, AND IN THE EASTERN CONUS. TODAY'S MANUAL BLEND DEPICTS NEGATIVE HEIGHT ANOMALIES OVER THE ALEUTIANS AND PARTS OF THE WESTERN THIRD OF THE CONUS, WITH POSITIVE HEIGHT ANOMALIES ELSEWHERE.

LOW-LEVEL WINDS ARE PREDICTED TO BE SOUTHEASTERLY OVER MUCH OF ALASKA, ORIGINATING FROM CANADA AS OPPOSED TO THE RELATIVELY WARMER OCEAN. THIS FAVORS BELOW NORMAL TEMPERATURES FOR MOST OF ALASKA. TROUGHING IN THE WESTERN CONUS INCREASES THE LIKELIHOOD FOR BELOW NORMAL TEMPERATURES FOR THE PACIFIC NORTHWEST. AN ANOMALOUSLY STRONG RIDGE IN THE EASTERN U.S. ENHANCES THE LIKELIHOOD FOR ABOVE NORMAL TEMPERATURES THERE.

AN ACTIVE STORM TRACK ACROSS THE CONUS FAVORS ABOVE MEDIAN PRECIPITATION FOR PARTS OF THE SOUTH COAST OF MAINLAND ALASKA, THE ALASKA PANHANDLE, AND MUCH OF THE CONUS, EXCEPT FOR PARTS OF THE SOUTHERN U.S., AS THE STORM SYSTEMS ARE EXPECTED TO REMAIN A BIT FARTHER NORTH. RELATIVELY DRY LOW-LEVEL FLOW, ORIGINATING FROM CANADA, IS FORECAST OVER MOST OF ALASKA, FAVORING BELOW MEDIAN PRECIPITATION FOR THE REST OF ALASKA.

FORECAST CONFIDENCE FOR THE 6-10 DAY PERIOD: ABOVE AVERAGE, 4 OUT OF 5, DUE TO GOOD AGREEMENT AMONG THE MODEL SOLUTIONS AND AMONG THE FORECAST TOOLS.  

8-14 DAY OUTLOOK FOR MAR 28 - APR 03, 2017 

DURING WEEK-2 THE TROUGH ENERGY APPROACHING THE WEST COAST IS FORECAST TO UNDERCUT THE WEST-CENTRAL U.S. RIDGE WHILE THE TROUGH OVER THE NORTHEAST CONUS IS FORECAST TO WEAKEN AND LIFT OUT TO THE NORTHEAST. THE OVERALL CIRCULATION  PATTERN IS EXPECTED TO UNDERGO DEAMPLIFICATION RESULTING IN A MOSTLY ZONAL FLOW PATTERN ACROSS THE SOUTHERN CONUS. THE ENSEMBLE SPAGHETTI CHARTS GENERALLY INDICATE MODERATE SPREAD ACROSS MOST OF THE FORECAST DOMAIN, WITH SOMEWHAT LARGER SPREAD DEPICTED FOR THE NORTHERN JET STREAM. THE 500-HPA BLENDED HEIGHT CHART INDICATES NEAR TO BELOW NORMAL HEIGHTS OVER THE ALEUTIANS AND PARTS OF THE WESTERN CONUS, AND NEAR TO ABOVE NORMAL HEIGHTS OVER THE REMAINDER OF THE FORECAST DOMAIN.

ANOMALOUS NORTHERLY FLOW ENHANCES PROBABILITIES FOR BELOW NORMAL TEMPERATURES FOR PARTS OF NORTHERN NEW ENGLAND. ABOVE NORMAL HEIGHTS AND/OR ANOMALOUS  SOUTHEASTERLY FLOW TILT THE ODDS TO NEAR TO ABOVE NORMAL TEMPERATURES FOR MUCH  OF THE CENTRAL AND EASTERN U.S. (EXCEPT THE NORTHEAST). BELOW NORMAL HEIGHTS FAVOR BELOW NORMAL TEMPERATURES FOR PARTS OF THE FAR WESTERN CONUS. LOW LEVEL FLOW FROM INTERIOR WESTERN CANADA FAVORS BELOW NORMAL TEMPERATURES FOR PARTS OF SOUTHEASTERN ALASKA AND THE ALASKA PANHANDLE.

ABOVE NORMAL HEIGHTS TILT THE ODDS TO BELOW MEDIAN PRECIPITATION FOR PARTS OF CENTRAL AND SOUTHERN FLORIDA AND WESTERN TEXAS. TROUGH ENERGY MOVING ONSHORE NEAR THE WEST COAST AND A ZONAL SOUTHERN JET STREAM ENHANCE PROBABILITIES FOR ABOVE MEDIAN PRECIPITATION FOR MUCH OF THE REMAINDER OF THE CONUS. ABOVE NORMAL HEIGHTS FAVOR BELOW MEDIAN PRECIPITATION FOR MUCH OF ALASKA.

FORECAST CONFIDENCE FOR THE 8-14 DAY PERIOD IS: BELOW AVERAGE, 2 OUT OF 5, DUE TO FAIRLY GOOD AGREEMENT AMONG THE ENSEMBLE MEAN SOLUTIONS OFFSET BY THE EXPECTATION OF MOSTLY SMALL MAGNITUDE HEIGHT ANOMALIES AND DISAGREEMENTS AMONG THE PRECIPITATION TOOLS.

THE NEXT SET OF LONG-LEAD MONTHLY AND SEASONAL OUTLOOKS WILL BE RELEASED ON  APRIL 20

Some might find this analysis click to read interesting as the organization which prepares it focuses on the Pacific Ocean and looks at things from a very detailed perspective and their analysis provides a lot of information on the history and evolution of ENSO events.

Analogs to the Outlook.

Now let us take a detailed look at the "Analogs" which NOAA provides related to the 5 day period centered on 3 days ago and the 7 day period centered on 4 days ago. "Analog" means that the weather pattern then resembles the recent weather pattern and was used in some way to predict the 6 - 14 day Outlook.

Here are today's analogs in chronological order although this information is also available with the analog dates listed by the level of correlation. I find the chronological order easier for me to work with. There is a second set of analogs associated with the Outlook but I have not been regularly analyzing this second set of information. The first set which is what I am using today applies to the 5 and 7 day observed pattern prior to today. The second set, which I am not using, relates to the correlation of the forecasted outlook 6 - 10 days out with similar patterns that have occurred in the past during the dates covered by the 6 - 10 Day Outlook. The second set of analogs may also be useful information but they put the first set of analogs in the discussion with the second set available by a link so I am assuming that the first set of analogs is the most meaningful and I find it so.

Day

ENSO

Phase

PDO AMO

Other Comments

Mar 9, 1966 El Nino -(t) +  
Mar 10, 1966 El Nino -(t) +  
Mar 28, 1986 Neutral + -  
Mar 3, 1987 El Nino + - Possibly a Modoki
Mar 4, 1987 El Nino + - Possibly a Modoki
Mar 26, 2004 Neutral + +  
Mar 10, 2007 Neutral N + After an El Nino
Mar 11, 2007 Neutral N +  
Mar 19, 2009 Neutral - -  

(t) = a month where the Ocean Cycle Index has just changed or does change the following month.

One thing that jumped out at me right away was the spread among the analogs from March 4 to March 28 which is 24 days which is a fairly tight spread. I have not calculated the centroid of this distribution which would be the better way to look at things but the midpoint, which is a lot easier to calculate, is about March 16. These analogs are centered on 3 days and 4 days ago (March 15 or March 16). So the analogs could be considered to be in sync with the calendar meaning that we will be getting weather that we would normally get at this point in the calendar. .

For more information on Analogs see discussion in the GEI Weather Page Glossary.

There are four El Nino Analogs, five ENSO Neutral Analogs and zero La Nina analogs. Looks like the analogs are suggesting that ENSO Neutral to El Nino Conditions apply. The phases of the ocean cycles of the analogs do not point clearly to any particular McCabe Condition.

The seminal work on the impact of the PDO and AMO on U.S. climate can be found here. Water Planners might usefully pay attention to the low-frequency cycles such as the AMO and the PDO as the media tends to focus on the current and short-term forecasts to the exclusion of what we can reasonably anticipate over multi-decadal periods of time. One of the major reasons that I write this weather and climate column is to encourage a more long-term and World view of weather.

McCabe Maps modified to include the subtitles

Sometimes it is easier to work in black and white especially if you print this report so there is a black and white version from the later report by the same authors. Darker corresponds to red in the color graphic i.e. higher probability of drought.

McCabe Conditions from 2007 report with labels corrected with authors permission

McCabe Condition Main Characteristics
A Very Little Drought. Southern Tier and Northern Tier from Dakotas East Wet. Some drought on East Coast.
B More wet than dry but Great Plains and Northeast are dry.
C Northern Tier and Mid-Atlantic Drought
D Southwest Drought extending to the North and also the Great Lakes. This is the most drought-prone combination of Ocean Phases.

 

You may have to squint but the drought probabilities are shown on the map and also indicated by the color coding with shades of red indicating higher than 25% of the years are drought years (25% or less of average precipitation for that area) and shades of blue indicating less than 25% of the years are drought years. Thus drought is defined as the condition that occurs 25% of the time and this ties in nicely with each of the four pairs of two phases of the AMO and PDO.

Historical Anomaly Analysis

When I see the same dates showing up often I find it interesting to consult this list.

Recent CONUS Weather

This is provided mainly to see the pattern in the weather that has occurred recently.

Here is the 30 Days ending March 11, 2017

March 11 2017  30 Day temperature and precipitation departures.

The temperature anomaly pattern remains unchanged. The precipitation pattern is a bit muted but one can still still where the fire risk has been. Remember this is a 30 day average so seven recent days are added and seven more distant days are removed. Thus the average changes slowly.

And the 30 Days ending March 18, 2017

March 18, 2017 30 Day Temperature and Precipitation DeparturesImage Properties

The Great Plains Drought has really expanded into New Mexico. The temperature pattern is much muted. Remember this is a 30 day average so seven recent days have been added and seven more distant days have been removed so the map changes slowly.

B. Beyond Alaska and CONUS Let's Look at the World which of Course also includes Alaska and CONUS

I will be including the above graphic regularly as it really helps with understanding why things are happening the way they are.

Todays Forecast

Temperature at 2 Meters

Notice that below the map there is a tabulation of magnitude of the current anomalies by region. That is a large number for the Arctic:

Maine Reanalyer

This graphic is actuals not anomalies. Notice the demarcation areas between wet and dry areas.  The Southern Hemisphere is quite wet and the Northern Hemisphere is quite dry. CONUS, North Africa and Asia are particularly uniformly dry and it looks like Australia and South Africa and Southern South America want to join in.

Additional Maps showing different weather variables can be found here.

Near Term (Currently Set for Day 3 but the reader can change that)

World Weather Forecast produced by the Australian Bureau of Meteorology. Unfortunately I do not know how to extract the control panel and embed it into my report so that you could use the tool within my report. But if you visit it Click Here you will be able to use the tool to view temperature or many other things for THE WORLD. It can forecast out for a week. Pretty cool. Return to this report by using the "Back Arrow" usually found top left corner of your screen to the left of the URL Box. It may require hitting it a few times depending on how deep you are into the BOM tool.

Although I can not display the interactive control panel in my article, I can display any of the graphics it provides so below are the current worldwide precipitation and temperature forecasts for three days out. They will auto-update and be current for Day 3 whenever you view them. If you want the forecast for a different day Click Here

Precipitation

BOM World Preciptation  Wednesday

Notice the wet belt along the Equator. Brazil continues to be wet. A big storm in the Pacific.

Temperature

BOM Current Temperature Wedensday

It is projected to be hot in much of Africa, Australia, and India.

Looking Out a Few Months

Here is the new precipitation forecast from Queensland Australia:

Stable near zero SOI  forecast for Mar - May 2017.

It is kind of amazing that you can make a worldwide forecast based on just one parameter the SOI and changes in the SOI. Notice the change to a dry CONUS and the overall slightly dry orientation of the forecast except for much of Southern Africa.

JAMSTEC Forecasts

JAMSTEC issued their ENSO forecasts and climate maps on March 15. We published a special Update Report on Saturday Night March 18 which can be accessed by clicking here. Remember if you leave this page to visit links provided in this article, you can return by hitting your "Back Arrow", usually top left corner of your screen just to the left of the URL box. One can always find the latest JAMSTEC maps at this link. You will find additional maps that I do not general cover in my monthly Update Report.

Sea Surface Temperature (SST) Departures from Normal for this Time of the Year i.e. Anomalies

My focus here is sea surface temperature anomalies as they are one of the two largest factors determining weather around the World.

And when we look at the current Sea Surface anomalies below, we see a lot of them not just along the Equator related to ENSO. I have switched over to the weekly analysis. It is less visually interesting but probably more meaningful and the Daily has have some update issues. . .

Weekly SST Anomalyi

Remember this discussion is all about anomalies not absolute temperatures so it is deviation from seasonal norms.
The Tropical Pacific is NEUTRAL. The waters off of South America are warm and expanding. This looks like how an El Nino originates.
The cool anomaly needed to have PDO+ is there but the horseshoe shaped warm anomaly around it is not there. The NOAA Pacific Decadal Oscillation (PDO) Index as reported by NOAA (Washington University also reports the PDO but using a different methodology which results in higher index numbers) has been 2016-January 0.79, 2016- February +1.25, 2016- March 1.55, 2016- April +1.62. 2016- May +1.45, 2016-June +0.78, 2016-July 0.15, 2016-August -0.87, 2016- September -1.06, 2016- October -0.68, 2016- November +0.84, 2016- December +0.55 and now January revised to 0.13 and February was recently reported at +0.08. The above reading for February is PDO Positive but not by much.  Here is the full list of PDO values.
The Gulf of Mexico is quite warm especially to the west. The waters off of North American are warm. The list of Atlantic Multidecadal Oscillation (AMO) values can be found here.
The Black Sea, Caspian Sea and the Mediterranean are ever so slightly warm.
The waters at mid-latitude East of South America are now warm. The big story is the warm South Pacific. Is this a new flavor of El Nino?
I have some additional commentary on this static analysis of the anomalies below where I examine the four-week change in these anomalies.
Since these are "departures" or "anomalies", it is not a seasonal pattern that is being shown it is the changes from what we would expect on a seasonal basis. It is important to understand that and interpret my comments above in the context of anomalies not absolute temperatures.

Below I show the changes over the last four weeks in the Sea Surface Temperature (SST) anomalies.

Comparing a four-week graphic to a prior four-week graphic is always tricky since only 25% of the data has changed and I am not showing the former graphic (it is in last week's report). I add the new one to my draft report, compare and comment on the change and then delete the old one to keep this report to a manageable size. Also it is important to recognize that what you see in this graphic is the change in the anomaly over the last four weeks. So blue means either cooler or less warm. Red means warmer or less cool. So you have to refer to the graphic above this one to really interpret this graphic as what we are seeing here is the change in the anomalies. What we see in this graphic is four weeks of change not the current absolute anomalies which are shown in the above graphic. It is not derivatives in the mathematical sense but deltas. They are somewhat similar. The graphic above this discussion is simply the current deviation from climatology and the graphic below shows the four week change in the deviation from climatology. So it is a bit like the graphic above and second below are the first and second derivatives of the sea surface temperature(SST) but not exactly. I take it a step further by comparing this week's version of the graphic below to the prior week and report on the differences below.the graphic. 

March 20, 2017 Change in four week SST Anomalies

What I see as I look at both last week's version of this graphic and the current one (before deleting the prior version) is the warming along the Equator in the Eastern Pacific has stabilized except off the Coast of South America where the trend in warming is both along the Equator and to the south and somewhat to the north (remember warming as a change in an anomaly can mean warmer or less cool). We remain in full ENSO Neutral perhaps headed according to some forecast models towards a Warm Event but it is not yet clear that this will be an El Nino i.e. meet all the necessary criteria particular the duration and confirmation by the SOI. The Western Pacific in the Northern Hemisphere is mostly cooling. I do not see a PDO pattern at all in the Eastern Pacific. East of Japan the trend is now cooling. At the southern end of South America the warm anomalies continue on the western side but the eastern side is now cooling. South and east of Africa the cool anomaly has strengthened.The entire Western Indian Ocean is cooling. The waters surrounding Australia are not showing a lot of change. Remember we are talking about changes in the anomalies something like a second derivative so you have to refer to the graphic above this one to know if blue is cool or less warm and if red is warm or less cool.  

Below is an analysis of projected tropical hazards and benefits over an approximately two-week period.

Tropical Hazards

This graphic updates on Tuesdays and I post on Monday which is almost a week later than when this graphic was last updated. So Week Two applies at the time I write this article on Monday but by the time you read it on Tuesday the Week Two that I am looking at is updated and becomes Week One. Mostly I see as I look at this on March 20 for what is shown as Week Two, the period March 22, 2017 to March 28, 2017, has dry conditions* for part of Southern Africa and wet conditions* east of the dry area. We see wet conditions* for Northwest Australia and parts of the Maritime Continent and dry conditions* for Eastern Brazil.
* Moderate Confidence that the indicated anomaly will be in the upper or lower third of the historical range as indicated in the Legend. 
** High Confidence that the indicated anomaly will be in the upper or lower third of the historical range as indicated in the Legend.

Now let us look at the Western Pacific in Motion.

Western Pacific Tropical Activity

The above graphic which I believe covers the area from the Dateline west to 100E and from the Equator north to 45N normally shows the movement of tropical storms towards Asia in the lower latitudes (Trade Winds) and the return of storms towards CONUS in the mid-latitudes (Prevailing Westerlies). This is recent data not a forecast. But, it ties in with the Week 1 forecast in the graphic just above this graphic.Also you can see the break in the action of Pacific Storms headed east.  Information on Western Pacific storms can be found by clicking here. This (click here to read) is an unofficial private source but one that is easy to read.

C. Progress of ENSO

A major driver of weather is Surface Ocean Temperatures. Evaporation only occurs from the Surface of Water. So we are very interested in the temperatures of water especially when these temperatures deviate from seasonal norms thus creating an anomaly. The geographical distribution of the anomalies is very important.
To a substantial extent, the temperature anomalies along the Equator have disproportionate impact on weather so we study them intensely and that is what the ENSO (El Nino - Southern Oscillation) cycle is all about.
Subsurface water can be thought of as the future surface temperatures. They may have only indirect impacts on current weather but they have major impacts on future weather by changing the temperature of the water surface.
Winds and Convection (evaporation forming clouds) is weather and is a result of the Phases of ENSO and also a feedback loop that perpetuates the current Phase of ENSO or changes it. That is why we monitor winds and convection along or near the Equator especially the Equator in the Eastern Pacific. 

Starting with Surface Conditions.

The current conditions are measured by determining the deviation of actual sea surface temperatures from seasonal norms (adjusted for Global Warming) in certain parts of the Equatorial Pacific. The below diagram shows those areas where measurements are taken.

El Nino Zones

NOAA focuses on a combined area which is all of Region Nino 3 and part of Region Nino 4 and it is called Nino 3.4. They focus on that area as they believe it provides the best correlation with future weather for the U.S. primarily the Continental U.S. not including Alaska which is abbreviated as CONUS. The historical approach of measurement of the impact of the sea surface temperature pattern on the atmosphere is called the Southern Oscillation Index (SOI) which is the difference between the atmospheric pressure at Tahiti as compared to Darwin Australia. It was convenient to do this as weather stations already existed at those two locations and it is easier to have weather stations on land than at sea. It has proven to be quite a good measure. The best information on the SOI is produced by Queensland Australia and that information can be found here. SOI is based on Atmospheric pressure as a surrogate for Convection and Subsidence. Another approach made feasible by the use of satellites is to to measure precipitation over the areas of interest and this is called the El Nino–Southern Oscillation (ENSO) Precipitation Index  (ESPI).  We covered that in a weekly Weather and Climate Report which can be found here. Our conclusion was that ESPI did not differentiate well between La Nina and Neutral. And there is now a newer measure not regularly used called the Multivariate ENSO Index (MEI). More information on MEI can be found here. The jury is still out on MEI and it it is not widely used. 

The below diagram shows the usual location of the Indo-Pacific Warm Pool. When the warm water shifts to the east we have an El Nino; to the west a La Nina.

Western Pacific Warm Pool

Click for Source

TAO/TRITON GRAPHIC (a good way of viewing data related to the part of the Equator and the waters close to the Equator in the Eastern Pacific where we monitor to determining the current phase of ENSO. It is probably not necessary to follow the discussion below, but here is a link to TAO/TRITON terminology.

And here is the current version of the TAO/TRITON Graphic. The top part shows the actual temperatures, the bottom part shows the anomalies i.e. the deviation from normal.

Current SST and wind anomalies

Location Bar for Nino 3.4 Area Above and Below
------------------------------------------------  A       B       C      D       E       -----------------

 

Notice that part of what is left of the the cool anomaly is west of 165W and barely gets counted as being in the Nino 3.4 Measurement Area.

The below table which only looks at the Equator shows the extent of anomalies along the Equator. I had split the table to show warm, neutral, and cool anomalies. The top rows showed El Nino anomalies. When there were no more El Nino anomalies along the Equator, I eliminated those rows. NOW i AM PUTTING THEM BACK IN. The two rows just below that break point contribute to ENSO Neutral and after another break, the rows are associated with La Nina conditions. I have changed the reference date to May 23, 1016. I probably have more to do but one step at a time.

Comparing Now to May 23, 2016

Subareas of the Anomaly

Westward Extension Eastward Extension Degrees of Coverage

As of Today

May 23, 2016

As of Today

May 23 2016

As of Today

In Nino 3.4

Dec 12, 2016

May 23, 2016

These Rows below show the Extent of El Nino Impact on the Equator
+0.5C to +1C

110W**

?

LAND

?

15

0

0

0

These Rows Below Show the Extent of ENSO Neutral Impacts on the Equator
0.5C or cooler Anomaly

155E

155E

120W

155W

85

50

95

50

0C or cooler Anomaly

160E

155W

165W

Land

35

5

85

60

These Rows Below Show the Extent of the La Nina Impacts on the Equator
-0.5C or cooler

LAND*

145W

LAND

Land

0

0

65

50

-1C or cooler Anomaly

LAND

140W

LAND

105W

0

0

40

35

 

* There is a small pocket of sub -0.5C water at about 175E. It is south of the Equator but reaches the Equator and is not in the Nino 3.4 Measurement Area. ** There is +0.5C as far west as 140W but not along the Equator.

It is useful to compare the current longitudinal extent of the water temperature anomalies with the situation on May 23, 2016 and the second checkpoint of December 12, 2016. What is new is that the part of the anomaly along the Equator which is cool enough to be ENSO Neutral or cooler has two components both ENSO neutral but one having a warm bias and one having a cool bias and the cool bias now for the first time only has 5 degrees of coverage.  This means there is 50 - 5 or 45 degrees of ENSO Neutral Warm Bias water from 135W to 120W.
If you just look on the Equator, there are 50 degrees of Longitude of Neutral to La Nina anomalies which is the maximum possible as the ONI Measurement Area is 50 degrees of Longitude wide and that also is the maximum possible since the ENSO Measurement Area only stretches for 50 degrees. There are today 0 degrees of water anomalies cool enough to be a La Nina. Subtracting 0 degrees from the 50 degrees you end up with 50 degrees of ENSO Neutral and 0 degrees of water cool enough to qualify as La Nina i.e. temperature anomalies more negative than -0.5C. A new factor is we now begin to see water that is warmer (anomaly) than +0.5C which is El Nino water. The ONI Measurement Area extends 5 degrees of Latitude North and South of the Equator so the above table is just a guide and a way of tracking the changes. Away from the Equator it is generally warmer. The water from 3N to 5N and from 3S to 5S had until recently remained relatively warm.

I calculate the current value of the ONI index (really the value of NINO 3.4 as the ONI is not reported as a daily value) each week using a method that I have devised. To refine my calculation, I have divided the 170W to 120W Nino 3.4 measuring area into five subregions (which I have designated from west to east as A through E) with a location bar shown under the TAO/TRITON Graphic). I use a rough estimation approach to integrate what I see below and record that in the table I have constructed. Then I take the average of the anomalies I estimated for each of the five subregions.

So as of Monday March 20, in the afternoon working from the March 19 TAO/TRITON report, this is what I calculated. [Although the TAO/TRITON Graphic appears to update once a day, in reality it updates more frequently.]

Calculation of ONI from TAO/TRITON Graphic
Anomaly Segment Estimated Anomaly
  Last Week This Week
A. 170W to 160W +0.0 +0.2
B. 160W to 150W +0.3 +0.4
C. 150W to 140W +0.3 +0.4
D. 140W to 130W +0.3 +0.5
E. 130W to 120W +0.3 +0.6
Total +1.2 +2.1
Total divided by five i.e. the Daily Nino 3.4 Index (+1.2)/5 = +0.2 (+2.1)5 = +0.4

 

My estimate of the daily Nino 3.4 SST anomaly is +0.4 which is an ENSO Neutral value but on the El Nino side within the Neutral Range. NOAA has reported the weekly Nino 3.4 to be an ENSO Neutral value at +0.3 which is on the El Nino Side side of Neutral..The cool anomaly has been moving around and NOAA reports a weekly value and I report an estimate of the daily value so that might explain the difference.
Nino 4.0 is also reported warmer than last week at 0.0.. Nino 3 is reported warmer also at 0.8. Nino 1 + 2 which extends from the Equator south rather than being centered on the Equator is also reported warmer at +2.6 which is an astoundingly high value. If it extended into Nino 3.4 it would represent a strong El Nino. It is worth mentioning that many Asian Meteorological Agencies work with Nino 3.0 rather than Nino 3.4 in which case we would be close to having El Nino Conditions with respect to Ocean Temperatures.
I am only showing the currently issued version of the NINO SST Index Table as the prior values are shown in the small graphics on the right with this graphic. The same data in table form but going back a couple of more years can be found here. 

March 20, 2017 Nino Readings

This is probably the best place to express the thought that this way of measuring an ENSO event leaves a lot to be desired. Only the surface interacts with the atmosphere and is able to influence weather. The subsurface tells us how long the surface will remain cool (or warm). Anomalies are deviations from "Normal". NOAA calculates and determines what is "Normal" which changes due to long ocean cycles and Global Warming. So to some extent, the system is "rigged". Hopefully it is rigged to assist in providing improved weather forecasts. But to assume that any numbers reported can be assumed to be accurate to a high level of precision is foolhardy. It is strange to me that the Asian forecasting services generally conclude that that this cool ENSO Phase is not a La Nina but a near La Nina and NOAA concludes it is a La Nina. It is the same ocean. The reported readings are very close but the Asian readings are generally slightly higher (less La Nina-ish) than the NOAA reading and their cut-off points for declaring a La Nina are a bit different and the parts of the Equator they look at are a bit different. It might be explained by what part of the ENSO pattern impacts their area of geography but it just seems to me that NOAA has been a bit over eager. And I wonder why.

Sea Surface Temperature and Anomalies

It is the ocean surface that interacts with the atmosphere and causes convection and also the warming and cooling of the atmosphere. So we are interested in the actual ocean surface temperatures and the departure from seasonal normal temperatures which is called "departures" or "anomalies". Since warm water facilitates evaporation which results in cloud convection, the pattern of SST anomalies suggests how the weather pattern east of the anomalies will be different than normal.

March 20, 2017 Equatorial Pacific SST Anomalies

A major advantage of the Hovmoeller method of displaying information is that it shows the history so I do not need to show a sequence of snapshots of the conditions at different points in time. This Hovmoeller provides a good way to visually see the evolution of this ENSO event. I have decided to use the prettied-up version that comes out on Mondays rather that the version that auto-updates daily because the SST Departures on the Equator do not change rapidly and the prettied-up version is so much easier to read.
You can see that the cool anomaly (bottom of the Hovmoeller has vanished with no blue in the Nino 3.4 Measurement Area), some white and now quite a bit of light yellow (still ENSO Neutral but on the warm side) and El Nino-ish dark yellows off and on from 155W east and browns tending towards reds from 100W east. However this lukewarm pattern weakened last week and has now returned to the situation two weeks ago. It is hard to tell if that is real or data irregularities/artifact. Remember the +5, -5 degree strip around the Equator that is being reported in this graphic. So it is the surface but not just the Equator. This is possibly the beginning of an El Nino pattern. But week to week there have been no change. If anything the pattern is fairly stable. Further west the surface is less warm.
I had stopped showing the below graphic which is more focused on the Equator but looks down to 300 meters rather than just being the surface. But recently there has been sufficient change to warrant including this graphic. And now that we are back tracking a possible El Nino it is the graphic of choice.

March 20, 2017 Upper Ocean Heat Anoma

The bottom of the Hovmoeller shows the current situation. The Cool Event is long gone. But what might be a Kevin wave initiating an El Nino is still not very impressive. If you look from the bottom of the graphic up you can see that any La Nina conditions ended in December. There is not much change from the prior week except for the small warm blip at about 125W. But what I am really looking for is the left portion of the graphic the Pacific Warm Pool and I don't see much change other than a diminishment of the area around the Dateline that is warm. Reds are what is needed for an El Nino.

Let us look in more detail at the Equatorial Water Temperatures.

We are now going to look at a three-dimensional view of the Equator and move from the surface view and an average of the subsurface heat content to a more detailed view from the surface down  This graphic provides both a summary perspective and a history (small images on the right). 

.March 20, 2017 Kelvin Wave Analysis.

Usually we use this to track Kelvin Waves but you can see the progression of warm water streaming east but not very much of it. This may have been a Kelvin Wave. It is not clear but the consensus now is that yes it was. The reason this is important is what is called the Bjerknes Feedback Mechanism which you can read about here. It is an intricate set of interactions which determines the ENSO Cycle. Of course Jacob Bjerknes the son of the world renowned Norwegian meteorologist Vilhelm Bjerknes developed his theories in the sixties. There have been many modifications/improvements in his theories since then and this process continues. You can track the history of this graphic on the right. I think it shows the prior week and then every other week before then. There has not been much change. There is no indication of an El Nino forming.

Now for a more detailed look. Notice by the date of the graphic (dated March 14, 2017) that the lag in getting this information posted so the current situation may be a bit different than shown. The date shown is the midpoint of a five-day period with that date as the center of the five-day period.

Below is the pair of graphics that I regularly provide.

The bottom graphic shows the absolute values, the upper graphic shows anomalies compared to what one might expect at this time of the year in the various areas both 130E to 90W Longitude and from the surface down to 450 meters. At different times and today in particular, I have discussed the difference between the actual values and the deviation of the actual values from what is defined as current climatology (which adjusts every ten years except along the Equator where it is adjusted every five years) and how both measures are useful but for different purposes.

Subsurface Heat Anomalies

Re the top graphic, let us first look at surface temperature anomalies. The -1C water no longer shows anywhere. We only see -0.5 C water now from 160W to 155W and it probably will soon not be shown as sub -0.5C. On the other hand warm water now extends from the Coast of Ecuador to 110W. Subsurface Temperature Anomalies: The cool water is almost all gone. Notice the warm water at depth almost everywhere extending to the coast of Ecuador with very warm water at 170E to 155W and to a lesser extent from 130W to 120W.

The bottom half of the graphic (Absolute Values which highlights the Thermocline) is now more useful as we track the transition to and ENSO Cool Event which may possibly become and El Nino.

It shows the thermocline between warm and cool water. The 28C Isotherm is now located at the 175E. This graphic does not show a 27.5C anomaly which might more precisely indicate where convection is likely to occur. The 27C isotherm is at 170W so we do not yet have ideal conditions for significant convection along the Equator east of the Dateline which is a characteristic of a Cool Event and also ENSO Neutral but it appears to be slowly changing. The 25C isotherm now extends all to the way to Ecuador. The 20C Isotherm is being increasingly depressed by warm water all the way to Ecuador. We are seeing the great swap where neutral and even warm water replaces the cooler water at the surface.
The flattening of the Isotherm Pattern is an indication  of ENSO Neutral just as the steepening of the pattern indicates La Nina or El Nino depending on where the slope shows the warm or cool pool to be. That flattening has occurred. At this point, we have gone to ENSO Neutral but not El Nino although the trend is towards an El Nino.

Here are the above graphics as a time sequence animation. You may have to click on them to get the animation going.

Equatorial Temperature Simulation

Isotherm Simulation

And now Let us look at the Atmosphere.

Low-Level Wind Anomalies near the Equator

Here are the low-level wind anomalies.

Low Level Wlind Anomalies

And now the Outgoing Longwave Radiation Anomalies which tells us where convection has been taking place. 

OLR Anomalies Along the Equator

You can see that the Coast of Ecuador is wet and it is wet in the India Ocean.

And Now the Air Pressure which Shows up Mostly in an Index called the SOI.

This index provides an easy way to assess the location of and the relative strength of the Convection (Low Pressure) and the Subsidence (High Pressure) near the Equator. Experience shows that the extent to which the Atmospheric Air Pressure at Tahiti exceeds the Atmospheric Pressure at Darwin Australia when normalized is substantially correlated with the Precipitation Pattern of the entire World. At this point there seems to be no need to show the daily preliminary values of the SOI but we can work with the weekly values.

Current SOI Readings
The 30 Day Average on March 20 was reported as -0.20 which is ENSO Neutral. The 90 Day Average was reported at 0.11 again as Neutral as an SOI reading can be. Looking at both the 30 and 90 day averages is useful and both are in agreement that we are in ENSO Neutral.

 

SOI = 10 X  [ Pdiff - Pdiffav ]/ SD(Pdiff)  where  Pdiff   =   (average Tahiti MSLP for the month) - (average Darwin MSLP for the month),  Pdiffav   =   long term average of Pdiff for the month in question, and SD(Pdiff)   =   long term standard deviation of Pdiff for the month in question. So really it is comparing the extent to which Tahiti is more cloudy than Darwin,  Australia.  During El Nino we expect Darwin Australia to have lower air pressure and more convection than Tahiti. During La Nina we expect the Warm Pool to be further east.       

To some extent it is the change in the SOI that is of most importance. It had been increasing in September but now from October through February the SOI has stabilized in the Neutral Range.

The MJO or Madden Julian Oscillation is an important factor in regulating the SOI and Kelvin Waves and other tropical weather characteristics. More information on the MJO can be found here. Here is another good resource. January accelerated the decline of this near La Nina development and most likely February will also be unkind in the opposite way in terms of the MJO as it does not deplete the cool pool but stimulates Kelvin Waves. .

This Table is a first attempt at trying to related the MJO to ENSO

  El Nino La Nina MJO Active Phase MJO Inactive Phase  
Relationship of MJO and ENSO
Eastern Pacific Easterlies
  • Weaker
  • Stronger
  • Part of Decay Process
  • Counteracts Easterlies
  • Enhances Easterlies
 
Western Pacific Westerlies
  • Stronger
  • May Create or Stimulate the Onset of El Nino via Kelvin Waves
  • Weaker
  • Part of Decay Process
  • Strengthens Westerlies
  • Weakens Westerlies
 
MJO Active Phase
  • More  likely
  • Stimulates
  • Less likely and weak
  • Retards development of a new La Nina
  • Stimulates the Jet Stream
   
MJO Inactive Phase
  • Less Likely
  • Suppresses
  • More likely but weak
  • Accelerates development of a new La Nina and the Decline of a mature La Nina
 
  • Slows the Jet Stream and can induce a Split Stream especially during a La Nina
 

 

Table needs more work. Is intended to show the interactions. What is more difficult is determining cause and effect. This is a Work in Progress. 

Forecasting the Evolution of ENSO

We now have both the Mid-March and early-month report from CPC/IRI  I am showing both as it is a way of seeing the trend in forecasts even though the methodology of the two forecasts are not identical.

First we look at the IRI/CPC March 16, 2017 fully model-based report.

March 16, 2017, 2016 Model Based ENSO Forecast

Here is the one week earlier what I call the "Tea Leaves Report" issued on March 9, 2017. I call it the Tea Leaves Report as it is not clear how this report is prepared as it is some combination of model results and opinions of meteorologists and it is just not possible to really know how this report is prepared.

March 9, 2017 CPC/IRI Model Probability Report.

Notice that in one week the probabilities for an El Nino soared. Look at JAS as an example. On March 9th the Tea Leaves concluded that the chances of an El Nino were ever so slighlty greather than the chances of ENSO Neutral. But one week later, the readers of the Tea Leaves looked at their model results and concluded that El Nino was an overwhelming favorite for JAS. That does not make any sense.

Here is the daily PDF and Spread Corrected version of the NOAA CFSv2 Forecast Model.

CFSv2 spread and bias correct ENSO forecast

The estimated current value of the Nino 3.4 Temperature Anomaly after the adjustments have been applied is an ENSO Neutral Value now with a warm bias and shooting higher rapidly this month. Looking ahead to next summer you see El Nino readings being the mean of the forecast ensemble but it is before the Spring Prediction Barrier which means we need to wait a few months until May [click here to understand why] before getting excited about that. Notice the wide spread among forecast member into the summer. But we clearly are forecast to be in ENSO Neutral for the rest of this Winter. The question is the coming summer and next winter.

The full list of weekly values can be found here.

From Tropical Tidbits.com

CDAS Legacy System

The above is from a legacy "frozen" NOAA system meaning the software is maintained but not updated. It seems to show a cycle in the Nino 3.4 Index Values. I see that as I monitor the TAO/TRITON graphic. My best guess is that it is related to the MJO but it certainly is intriguing. I do not need to draw in the lines for you to see that the Nino 3.4 Index as reported by CDAS has moved above the 0C line and is now reporting a warm anomaly but not an increasing warm anomaly.

Forecasts from Other Meteorological Agencies.

Here is the Nino 3.4 report from the Australian BOM (it updates every two weeks)

Australia POAMA ENSO model run

Discussion (notice their threshold criteria are different from NOAA).

El Niño WATCH: six of eight models suggest El Niño by July

The El Niño-Southern Oscillation (ENSO) is neutral. However, model outlooks and recent warming in the Pacific Ocean mean there is an increased chance of El Niño forming later this year. The Bureau's ENSO Outlook is currently at El Niño WATCH, which means the likelihood of El Niño forming this year is around double the average chance at 50%.

Most atmospheric and oceanic indictors of ENSO are currently neutral. However, sea surface temperatures (SSTs) in the eastern Pacific Ocean have warmed since the start of the year, and the Southern Oscillation Index (SOI) has been trending downwards. While these are fairly typical changes in the lead up to El Niño, trade winds and cloudiness have not shown any significant shift away from neutral.

All eight international models surveyed by the Bureau show steady warming of the central tropical Pacific Ocean over the next six months. Six models suggest El Niño thresholds may be reached by July 2017. However, some caution must be taken, as models have lower accuracy when forecasting through the autumn months than at other times of the year.

El Niño is often, but not always, associated with below average winter–spring rainfall over eastern Australia and warmer than average winter–spring maximum temperatures over the southern half of Australia.Here is the recently released JAMSTEC Nino 3.4 Forecast.

JAMSTEC March 1, 2017 ENSO Forecast.

Based on the Nino 3.4 projection, JAMSTEC is saying the Cool Event did not meet the criteria to have been declared a La Nina as was done by NOAA: Nino 3.4 being colder than -0.5 and the duration of being under -0.5 was not sufficient  to qualify as a La Nina.

JAMSTEC is raising the possibility of an El Nino for the following winter. But it is too soon to make that prediction with a high degree of confidence.

The Discussion that goes with their Nino 3.4 forecast follows:  Notice the suggestion that we might be having a Pacific Climate Shift to PDO Positive.

Mar. 21, 2017 Prediction from 1st Mar., 2017

ENSO forecast:

The SINTEX-F predicts that a moderate-to-strong El Niño event may start in early summer this year and reach its peak in winter. If this happens, it may suggest a decadal turnabout in the tropical Pacific climate condition to El Niño-like state after a long spell of La Niña-like state. Such natural climate variability may double the global warming impact as we observed during the period from 1976 through 1998. We need to be prepared well to this possible decadal climate regime shift.

Indian Ocean forecast:

Occurrence of a positive Indian Ocean Dipole is also clearly predicted by the SINTEX-F seasonal prediction system; the ensemble mean prediction suggests its evolution in summer and its height in fall. We may observe co-occurrence of a positive Indian Ocean Dipole and an El Niño in the latter half of 2017; this is just as we observed in 1997 and 2015.

Regional forecast:

On a seasonal scale, most part of the globe will experience a warmer-than-normal condition, while some parts of southern Canada and northern U. S., and northern Brazil will experience a colder-than-normal condition in the boreal spring. In the boreal summer, most parts of the globe will experience a hotter-than-normal condition. On the other hand, some parts of Europe, central Russia, and northern Australia will experience a cooler-than-normal condition.

As regards the seasonally averaged rainfall, a wetter-than-normal condition is predicted for western part of Brazil during the boreal spring, whereas most parts of southeastern China, Indonesia, eastern Brazil, southern Australia and Europe will experience a drier condition during the boreal spring. In the boreal summer, most parts of Indonesia, India, Australia, southeastern China, Mexico, and northern Brazil will experience a drier-than-normal condition, due to co-occurrence of the El Niño and the positive Indian Ocean Dipole.

Most parts of Japan will be in a warmer and drier-than-normal condition in the boreal spring. In boreal summer, we expect a wetter-than-normal and slightly hotter-than-normal condition due to development of the positive Indian Ocean Dipole and El Niño; El Niño influences may be cancelled due to development of the positive Indian Ocean Dipole and vice versa.

Indian Ocean IOD (It updates every two weeks)

The IOD Forecast is indirectly related to ENSO but in a complex way.

IOD POAMA Model Run

Discussion

Indian Ocean Dipole outlooks

The Indian Ocean Dipole (IOD) is neutral. The weekly index value to 12 March was −0.14 °C.

The influence of the IOD on Australian climate is weak during December to April. This is due to the monsoon trough shifting south over the tropical Indian Ocean and changing the overall wind circulation, which in turn prevents an IOD ocean temperature pattern from being able to form. Current outlooks suggest a neutral IOD for the end of autumn.

D. Putting it all Together.

This Cool Event is over and NOAA using the "toe in the water test" has recognized and acknowledged that on February 9, 2017. At this time there is now some interest as to whether or not next Summer and Fall will be El Nino situations. The models are suggesting this as a possibility. But it is too soon to tell due to the Spring Predictability Barrier or SPB which was explained earlier but for the convenience of the reader I am repeating the link.

Forecasting Beyond Five Years.

So in terms of long-term forecasting, none of this is very difficult to figure out actually if you are looking at say a five-year or longer forecast.

JAMSTEC has raised the possibility of a Climate Shift in the Pacific and the implications of this are discussed in a prior GEI Weather and Climate Report which you can access by clicking here.

The research on Ocean Cycles is fairly conclusive and widely available to those who seek it out. I have provided a lot of information on this in prior weeks and all of that information is preserved in Part II of my report in the Section on Low Frequency Cycles 3. Low Frequency Cycles such as PDO, AMO, IOBD, EATS.   It includes decade by decade predictions through 2050. Predicting a particular year is far harder. Parts of that discussion are in the beginning  section of this week's Report.

The odds of a climate shift for CONUS taking place has significantly increased. It may be in progress.  JAMSTEC is suggesting that if there is an El Nino in the winter of 2017/2018 this could signify that the PDO has entered its Positive Phase. The AMO is pretty much neutral at this point (but more positive i.e. warm than I had expected) so it may need to become a bit more negative for the "McCabe A" pattern to become established. That seems to be slow to happen so I am thinking we need at least a couple more years for that to happen. JAMSTEC is suggesting it might occur very soon.

E. Relevant Recent Articles and Reports

Nothing to report.

Weather Research in the News

Nothing to report

Global Warming in the News

Nothing to report.

F. Table of Contents for Page II of this Report Which Provides a lot of Background Information on Weather and Climate Science  

The links below may take you directly to the set of information that you have selected but in some Internet Browsers it may first take you to the top of Page II where there is a TABLE OF CONTENTS and take a few extra seconds to get you to the specific section selected. If you do not feel like waiting, you can click a second time within the TABLE OF CONTENTS to get to the specific part of the webpage that interests you.

1. Very High Frequency (short-term) Cycles PNA, AO,NAO (but the AO and NAO may also have a low frequency component.)

2. Medium Frequency Cycles such as ENSO and IOD

3. Low Frequency Cycles such as PDO, AMO, IOBD, EATS.

4. Computer Models and Methodologies

5. Reserved for a Future Topic  (Possibly Predictable Economic Impacts)

G. Table of Contents of Contents for Page III of this Report  - Global Warming Which Some Call Climate Change.  

The links below may take you directly to the set of information that you have selected but in some Internet Browsers it may first take you to the top of Page III where there is a TABLE OF CONTENTS and take a few extra seconds to get you to the specific section selected. If you do not feel like waiting, you can click a second time within the TABLE OF CONTENTS to get to the specific part of the webpage that interests you.

1. Introduction

2. Climate Impacts of Global Warming

3. Economic Impacts of Global Warming

4. Reports from Around the World on Impacts of Global Warming

Useful Background Information

With respect to relating analog dates to ENSO Events, the following table might be useful. In most cases this table will allow the reader to draw appropriate conclusions from NOAA supplied analogs. If the analogs are not associated with an El Nino or La Nina they probably are not as easily interpreted. Remember, an analog is indicating a similarity to a weather pattern in the past. So if the analogs are not associated with a prior El Nino or prior La Nina the computer models are not likely to generate a forecast that is consistent with an El Nino or a La Nina.

  El Ninos La Ninas
  Start Finish Max ONI PDO AMO Start Finish Max ONI PDO AMO
            DJF 1950 J FM 1951 -1.4 - N
T   JJA 1951  DJF     1952 0.9 - +          
   DJF 1953  DJF     1954 0.8 - + AMJ 1954  AMJ 1956 -1.6 - +
M MAM 1957  JJA     1958 1.7 + -          
M SON 1958 JFM     1959 0.6 + -          
M   JJA 1963 JFM     1964 1.2 - - AMJ 1964  DJF 1965 -0.8 - -
M  MJJ 1965 MAM    1966 1.8 - - NDJ 1967 MAM 1968 -0.8 - -
M OND 1968 MJJ      1969 1.0 - -          
T  JAS 1969  DJF     1970 0.8 N -  JJA 1970  DJF 1972 -1.3 - -
T AMJ 1972 FMA     1973 2.0 - - MJJ 1973 JJA 1974 -1.9 - -
            SON 1974 FMA 1976 -1.6 - -
T ASO 1976 JFM     1977 0.8 + -          
M ASO 1977 DJF      1978 0.8 N            
M SON 1979 JFM     1980 0.6 + -          
T MAM 1982  MJJ     1983 2.1 + - SON 1984 MJJ 1985 -1.1 + -
M ASO 1986  JFM    1988 1.6 + - AMJ 1988 AMJ 1989 -1.8 - -
M MJJ 1991  JJA     1992 1.6 + -          
M SON 1994  FMA    1995 1.0 - - JAS\ 1995 FMA 1996 -1.0 + +
T AMJ 1997  AMJ    1998 2.3 + + JJA  1998 FMA 2001 -1.6 - +
M MJJ 2002  JFM    2003 1.3 + N          
M  JJA 2004 MAM    2005 0.7 + +          
T ASO 2006 DJF      2007 0.9 - + JAS  2007  MJJ 2008 -1.4 - +
M JJA 2009 MAM     2010 1.3 N + JJA  2010 MAM 2011 -1.3 + +
            JAS 2011 JFM  2012 -0.9 - +
T MAM 2015 AMJ     2016 2.3 + N  JAS 2016 NDJ  2016 -0.8*  + +

 

*The GEI Weather and Climate Report does not accept this as a legitimate La Nina. It is not unusual for different Meteorological Agencies to maintain different lists of El Ninos and La Ninas. This is usually because the criteria for classification differ slightly. Obviously the GEI Weather and Climate Report has no standing but nevertheless for any analysis we do, we will either not include or asterisk this La Nina to indicate that NOAA  has it on their list and we consider that to be Fake News. The alternative is to conclude that the other Meteorological Agencies are not able to measuring things correctly. .

ONI Recent History

ONI History Updated on March 6, 2017

The Dec/Jan/Feb preliminary has just come out as -0.4. Looks like NOAA chickened out re extending their farcical phony ONI record into the first three months of 2017. The full history of the ONI readings can be found here. The MEI index readings can be found here.

Click here for a list of Sig Silber's Weather Posts

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