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September 13, 2019 Weather Impacts On Economic Activity – New Forecast

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Written by Sig Silber

Updated at 9:45 p.m. EDT to reflect the new Week 3 – 4 Forecast

We cover a lot of ground tonight. We have a new ENSO Update, the State Temperature and Precipitation rankings for last month, some reservoir level reports, and a new crop production forecast which is not horrible but also certainly not good news. Each week we report on the current status of the crop and once a month or as the data comes in, we report on the forecast of the final seasonal results. Of course, we present the weekly drought report. And we have many other regular drought related indices we report on including wildfires and floods. We also provide a shortened version of the Intermediate-term weather forecast.

September 5, 2019

 


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New Format: Each week our Thursday night article will cover the Drought Monitor Report issued by NOAA in conjunction with the University of Nebraska – Lincoln and a summary of U.S. crop conditions.

It provides a link to the Severe Weather Report (this will take two clicks since that report gets republished each day and so you click here to get to the Directory and then click again on the version of the Severe Weather Report closest to the top of the list. Soon, we may have a link to a full weather report, not just severe weather.

Each week, this article will have a different special feature. Examples of special features might be:

A. a more detailed look at crop progress (We focus tonight on the new NASS forecast)

B. a review of the prior month’s weather. (tonight we looked at August)

C. a review of the prior month’s International Weather

D. Current conditions of rivers and reservoirs.(we look at that a bit)

E. Economic Impacts other than crop-related (storm impacts including flooding and drought impacts including wildfires)

F. Other.

ENSO News (Is it news when it is expect?) Note. We remove the links to the figures in this report because it is difficult to include them and we show most of those graphics in our regular Monday Report.

CPC/IRI ENSO Update Published: September 12, 2019

El Niño/Southern Oscillation (ENSO) Diagnostic Discussion issued jointly by the Climate Prediction Center/NCEP/NWS and the International Research Institute for Climate and Society

ENSO Alert System Status: Not Active

Synopsis:

ENSO-neutral is favored during the Northern Hemisphere fall 2019 (~75% chance) and is expected to continue through Northern Hemisphere spring 2020 (55-60% chance).

During August, ENSO-neutral continued as reflected by the near-average sea surface temperatures (SST) across most of the central and eastern equatorial Pacific Ocean. The latest weekly Niño-3 and Niño-3.4 values were -0.2°C and 0.0°C, respectively, with the westernmost Niño-4 region remaining above average (0.5°C) and the easternmost Niño-1+2 region remaining below average (-0.6°C). Upper-ocean subsurface temperature anomalies (averaged across 180°-100°W) decreased slightly during the month , with below-average temperatures strengthening in the east-central equatorial Pacific. Suppressed tropical convection continued over parts of Indonesia, while near-average convection was evident near the Date Line. Low-level and upper-level wind anomalies were near average over most of the tropical Pacific Ocean. Overall, oceanic and atmospheric conditions were consistent with ENSO-neutral.

The majority of models in the IRI/CPC plume continue to favor ENSO-neutral (Niño-3.4 index between -0.5°C and +0.5°C) through the Northern Hemisphere spring. However, the statistical model* averages appear to favor Niño-3.4 values that are at the ElNiño thresholds (+0.5°C) during the fall and winter. Forecasters are leaning toward the dynamical model average, which is also supported by the current tendency of the ocean toward cooler conditions. In summary, ENSO-neutral is favored during the Northern Hemisphere fall 2019 (~75% chance) and is expected to continue through Northern Hemisphere spring 2020 (55-60% chance; click the CPC/IRI consensus forecast for the chance of each outcome for each 3-month period).

This discussion is a consolidated effort of the National Oceanic and Atmospheric Administration (NOAA), NOAA’s National Weather Service, and their funded institutions. Oceanic and atmospheric conditions are updated weekly on the Climate Prediction Center web site (El Niño/La Niña Current Conditions and Expert Discussions). Forecasts are also updated monthly in the Forecast Forum section of CPC’s Climate Diagnostics Bulletin. Additional perspectives and analysis are also available in an ENSO blog.

The next ENSO Diagnostics Discussion is scheduled for 10 October 2019. To receive an e-mail notification when the monthly ENSO Diagnostic Discussions are released, please send an e-mail message to: [email protected].

Not very different from the assessment last month. For those who want the figures, this link will take you to the official version which has live links to the figures. *We have expressed our opinion of statistical models for short-term ENSO predictions before. We agree with favoring the dynamical models. For longer term predictions a statistical model would be favored.

September 12, ENSO Probabilities

I would like to say it is significant that the new forecast on the left is more certain than the prior forecast that we will remain in ENSO neutral conditions but the differences in the methodologies between the first and second report in each month prevents me from saying that as per the ENSO Diagnostic Discussion.

September 12, 2019 DFSv2 ENSO Forecast

The NOAA proprietary model has been jumping around a lot but currently is forecasting total ENSO Neutral

A Review of August State Rankings i.e. where they stand relative to the 125 year history.

1-Month Statewide Maximum Temperature Ranks

New Mexico, Arizona, and Utah set record highs. There were a number of states (pale blue) below average. South Dakota was much below average.

For average temperature there were a lot of states shown in orange.

Minimum Temperatures are also important but less so this time of the year as we are less concerned about freezing temperatures in August. I live in a state that had a 124th warmest August relative to lows and it was not very comfortable in our house which does not have airconditioning as it is normally not needed. The failed Monsoon had a lot to do with this. It probably worked out well for the power utility.

Now let us look at precipitation.

Kansas and Nebraska were record wet. Arizona and Utah did not set records but were quite dry. Again this recorded the failed Monsoon. You can see how the Plains States and the Southwest are negatively correlated in the summer.

Sometimes Climate Divisions are a good way of looking at things.

https://www.ncdc.noaa.gov/monitoring-content/sotc/national/divisionalpcpnrank/divisionalpcpnrank-201908-201908.png

We see a part of California that was record dry. It was hidden when you looked at just the statewide data.

Looking at Reservoirs

Western Reservoirs

Only NM (which always has a problem) and Washington State have a problem.

California Reservoir Situation

They are all in good shape.

A new crop forecast came out today and we did not notice that it was available until late in the day so we have not reviewed it but thought we should share it anyway as it will be reported in publications that focus on agriculture and perhaps elsewhere also. We will comment more next week.

Corn September 12, 2019

Decline from last year and also from the August forecast.

NASS v Industry Corn September 12, 2019

Last month the NASS forecast was much higher than the range of industry forecasts but now it is in the middle of the pack. NASS has declined a bit but the group of industry forecasts are now much higher.

Soybeans September 12, 2019

Decline from last year and also from the forecast last month.

Soybeans NASS v Industry

Last month the NASS forecast was almost the lowest compared to other industry forecasts. This month it is almost the highest. The NASS forecast did not change very much but the other forecasts did. It is possible the NASS forecast has room to decline to be more in line with other forecasts in the industry.

Cotton September 12, 2019

Cotton is slightly lower than the forecast last month but is showing a big gain over last year. It is surprising given the number of acres planted is lower and the yield forecast is lower. New Math?

Sorghum et al September 12, 2109

Sorghum and tobacco are lower than last year and less than forecast in August. Sugarbeets is less than forecast last month but still showing a gain compared to last year. Sugarcane is higher than the forecast last month and this makes it a gain over last year.

Peanuts September 12, 2019

An improvement from the forecast last month and this makes it a gain over last year.

Legumes September 12, 2019

Dry edible peas is the largest of the three shown and is forecast to have a large gain over last year while chickpeas and lentils are projected to be much less than last year.

Citrus and Nuts September 12, 2019

All shown as down from last year.

And shifting to the Alaska and CONUS Weather Forecast

First Temperature

Day 3 Max Temperature

6 - 10 Day Forecast Temperature

8 - 14 Day Temperature

3 - 4 Week Temperature

And then Precipitation

Five day QPF

6 - 10 Day Forecast Precipitation

8 - 14 Day Precipitation

3 - 4 Week Precipitation

The Week 3 – 4 Forecast was updated on September 13, 2019.  Right now the forecast does not seem especially favorable (too dry too early) for corn and soybeans. One needs to look at a lot of factors to determine how the current and Intermediate-term forecast might impact the crop.

Here is the discussion released with the new Week 3 – 4 Forecast. 

Week 3-4 Forecast Discussion Valid Sat Sep 28 2019-Fri Oct 11 2019

Today’s forecast is especially tricky for a couple of reasons. First, aside from tropical Kelvin and equatorial Rossby wave activity, there is no large-scale variability on Week 3-4 timescales to anchor the atmospheric state. Second, the forecast period falls in a climatologically active part of hurricane season. Hurricane formation and potential track are difficult to predict 3-4 weeks in advance. Atlantic and eastern Pacific hurricanes can directly influence weather over the forecast area and any hurricane can indirectly influence the forecast area by re-curving poleward and perturbing the mid-latitude wave guide.

Most of our model guidance predicts a time-mean amplified pattern over North America during the Week 3-4 period. Both the CFS and the ECMWF forecast an anomalous trough just south of the Aleutians, but the trough is about 100m deeper in the CFS (-120m vs -20m). The rest of the Rossby wave over North America is of similar amplitude between the models, although the ECMWF positions the wave slightly further north than the CFS. As one might expect from the height pattern, the CFS predicts colder temperatures over Alaska than the ECMWF does. Both models predict anomalous warmth over the western CONUS and near to below normal temperatures in the eastern CONUS, but the CFS positions the most anomalous cold air over the Southeast whereas the ECMWF positions it over the Great Lakes region.

In-line with our calibrated model guidance along with our statistical MLR tool, our forecast favors above normal temperatures for most of the western and southern parts of the country and below normal temperatures throughout the mid-west and northern New England. Our forecast probabilities of above normal temperatures over Alaska are around 60%.

The precipitation outlook features below normal precipitation along the northern part of the CONUS and throughout the Plains, based on an amplified ridge forecast near the West Coast. Above normal precipitation is also forecast along coastal parts of Alaska due a southerly flow over anomalously warm waters. Above normal precipitation is also forecast throughout the coastal Southeast due to the potential for tropical cyclone activity.

SSTs are forecast to remain above normal around Hawaii, which should lead to above normal temperature and precipitation.

Hurricanes are a mixed bag. They are destructive but bring moisture. So there is a tradeoff. Many places would be in semi-permanent drought if not for cyclones.

Dorian rain pattern

It truly was a coastal storm.

Dorian impacts September 12, 2019

This graphic is interesting becasue it shows the where crops are grown.

Current Drought Conditions

Now we take a look at Thursday’s U.S. Drought Monitor Report.

The U.S. Drought Monitor is a comprehensive way of understanding the drought situation for the U.S. It is issued every Thursday and reflects the conditions as of the prior Tuesday. Drought is defined as a moisture deficit bad enough to have social, environmental or economic effects. Thus, more factors than recent precipitation are considered and more information on how it is done is found at the end of this report.

https://droughtmonitor.unl.edu/data/png/20190910/20190910_usdm.png

U.S. Affiliated Pacific Islands and the U.S. Virgin Islands.

https://droughtmonitor.unl.edu/data/png/20190910/20190910_usdm_pg2.png

The Western Pacific is an area that has been in drought probably due to the El Nino. This part of the world generally requires two inches of rain per week to avoid drought. Until recently you could see that at about 8N there was a dividing line between Moderate to no Drought and Severe to Exceptional Drought. The situation seems to be dramatically improving. There are only a few Pacific Islands still in drought. And in the Antilles, TS/Hurricane Dorian dramatically reduced drought categories there but created a disaster in the Bahamas. .

Below is the map for just CONUS.

https://droughtmonitor.unl.edu/data/png/20190910/20190910_conus_trd.png
September 12, 2019
On an overall basis, the area impacted by drought and abnormally dry conditions increased from 29.54% to 31.03% which is insignificant and it is mainly D0 and D1. The number of people impacted by drought increased from 24,022,385 to 32,763,165 which is a big increase. There continues to be no more D4 but D3 has increased from 0.20%to 0.31% which is not a high number but which is a large percentage increase. D2 has increased from 1.27% to 2.50% which is not a high number but is a doubling. D1 increased from 8.57% to 10.76% which is also a large change. But D0, which is not drought but abnormally dry, decreased from 19.50% to 17.46% which is not a significant change but indicates that some D0 has been upgraded to D1 but not a lot of new area has been rated D0. D0 is not included when estimating the number of people impacted. So the increase in number of people impacted is partially related to the upgrading of D0 to D1 not expanding the area that is dry. For now, we remain in good shape but the trend is a bit concerning but typical for this time of the year. Compared to a year ago, this is a very good situation with respect to drought.
And we expect some changes but not a lot. We show the areas at risk later with the drought forecast through November.
Last Week This Week

https://droughtmonitor.unl.edu/data/png/20190903/20190903_conus_trd.png

https://droughtmonitor.unl.edu/data/png/20190910/20190910_conus_trd.png

Some might find this animation of twelve weeks of change useful;

Animation of six weeks of change

The graphic below shows the one-week change in drought intensity. Yellow is bad. Green is good.

https://docs.google.com/vihttps://droughtmonitor.unl.edu/data/chng/png/20190910/20190910_conus_chng_PW.png

Somewhat of a repeat of last week with Ariizona and Texas dry but extreme southern Texas wet. The Northwest was wet and the eastern CONUS away from the coast was dry. It will be easier to see individual states in the regional maps which follow and for those interested in a particular state, those maps can be accessed here.

Now we show the week to week change information by region. The yellow is where the level of drought has been raised. The green is where the level of drought has been lowered.

https://droughtmonitor.unl.edu/data/chng/png/20190910/20190910_high_plains_chng_PW.png
Deterioration in Colorado
Mixed with improvement to the west and north and deterioration to the east and south. Kentucky was probably the state with the most deterioration.
Deterioration in Maryland and West Virginia
Some deterioration in Tennessee. A lot of deterioration in Oklahoma, Louisiana, Arkansas and most importantly Texas except extreme south Texas and West Texas.
Except the area impacted by Dorian, there has been deterioration. Not much change in Florida other than western Florida.
Arizona is the focus of the deterioration but there was some in New Mexico, Colorado, Utah, and Nevada. There was improvement in Oregon and Washington and also western Montana.

September 12, 2019

The past week again had a north/south divide. The chart on the upper right is month to date precipitation so it is much like the weekly and on the lower left it is month to date precipitation as a percent of normal which provides more information. The lower right is the Water Year to date. We are starting to see some less green area towards the bottom of this graphic.

Here is the Discussion that was issued with the Drought Report.

This Week’s Drought Summary

Northeast

Light showers dropped 0.5-1.5 inches of rain across northern sections of New York, Vermont, New Hampshire, and Maine. Although offshore in the Atlantic Ocean, Dorian came close enough to far eastern Maine that 1.5-4 inches of rain accumulated. Elsewhere, it was mostly dry across the Northeast. The small D0 areas in upstate New York and New England remained unchanged as this week’s light rain were not enough for removal, but great enough (including last week’s higher rainfall) to prevent expansion. Farther south, however, conditions have recently been drier in the mid-Atlantic and central Appalachians with slightly above-normal temperatures (1-3 degs F). As a result, between 50-75% of normal precipitation has fallen during the past 60-days, accumulating deficits of 2-4 inches. For the week ending Sep. 8, 33, 63 and 74% of the topsoil moisture in West Virginia, Maryland, and Delaware, respectively, was rated short to very short, according to the USDA. Therefore, D0 was added to the Delmarva Peninsula, and expanded in southern West Virginia.

Southeast

With a weakened Hurricane Dorian lurking just off the Carolina coasts and tracking northeastward, a sharp gradient of precipitation amounts was produced. 10-15 inches of rain was dumped on some coastal locations in South Carolina (e.g. Pawleys Island 15.21″; Georgetown 13.38″; North Myrtle Beach 10.44″) and North Carolina (Wilmington coop 13.07″; Smith Creek 11.36″; Wilmington NWS 10.80″; Kingston 8.68″), but totals rapidly declined to the west, with no rain at all in central sections of the Carolinas. Several tornadoes were spawned in the eastern Carolinas, and a severe storm surge on Ocracoke Island required numerous rescues. With that stated, D0 and D1 was removed from northeastern South Carolina and southeastern North Carolina (some 2 cat improvements, D1 to nothing), and some D0 was erased in southeastern South Carolina. Further inland, however, a week of no rain, above-normal temperatures, and windy conditions increased 60-day deficits and evapotranspiration rates. The D1 and D2 areas corresponded to 2-month deficits of 3-6 inches, while newly added D0 areas were generally 50-70% of normal for the same time period. USDA statewide short to very short topsoil moisture percentages have also increased across parts of the Southeast: Virginia (77), Georgia (64), Alabama (53), South Carolina (50), and North Carolina (33). USGS 7-day averaged stream flow have also declined across central sections of Alabama and Georgia, with numerous sites in the lower tenth percentile (much below normal), while western and central South Carolina, Florida Panhandle, and southern Virginia were in the 10-24th percentile (below normal). USDA/NASS pastures for the week ending Sep. 8 were rated very poor to poor in Virginia (50%), North Carolina (26%), South Carolina (22%), Georgia (25%), and Alabama (20%).

South

Mostly dry and warm weather enveloped much of the South, contributing to a rapid decline in short-term moisture conditions across most of Texas, southwest and southeast Oklahoma, southwest Arkansas, and northwest Louisiana. Even a few pockets of D0 were introduced in formerly wet central and northeastern sections of Tennessee. The few exceptions to this were outer bands of rain across southern Texas from Tropical Storm Fernand (which made landfall in northeastern Mexico), some light monsoonal showers in southwestern Texas and the northern Texas and Oklahoma Panhandles, and Day7 thundershowers in northern Louisiana and central Arkansas. A general 1-category improvement was made across southern Texas in response to 1-3 inches (locally 5 inches) of rain, while some slight improvements were made around the Midland area, Trans Pecos region, and in extreme northern Louisiana. In contrast, September’s climatologically higher rainfall totals for Texas and Oklahoma make degradation faster, and temperatures have remained high. Where little or no rain fell, a 0.5-1 category downgrade was made, especially in central Texas, but also in southwest and southeast Oklahoma, and bordering sections of Arkansas and Louisiana. According to USDA, percentages for both topsoil and subsoil moisture for Texas stood at 85 and 79%, respectively, as of Sep. 8, while topsoil moisture grew increasingly short to very short in Arkansas (67%), Louisiana (60%), Mississippi (66%), and Tennessee (52%). Even with the USDA topsoil moisture figure, Mississippi remained D0-D4 free as the entire state still had 60-day precipitation surpluses. Texas pasture and range conditions have been affected by the warmth and dryness, with 48% rated poor or very poor according to the Sep. 8 USDA/NASS report.

Midwest

Widespread light to moderate rains (0.5-2 inches) fell across the western and northern sections of the Midwest as several frontal systems dove southeastward out of Canada. The heaviest rains (1.5-3.5 inches) were reported across western and northern Minnesota, while bands of scattered thunderstorms moved across parts of Iowa, southern Wisconsin, northern Illinois, and the UP of Michigan. In contrast, little or no rain fell across southern and eastern portions of the Midwest (southern Missouri and Illinois, most of Indiana, southern lower Michigan, and much of Ohio and Kentucky). Not surprisingly, some improvement was made where the greatest totals occurred that greatly reduced or alleviated short-term deficits. This included around Duluth, MN; southwestern, central, and northeastern Iowa; northern Illinois; and the eastern UP of Michigan. Dry weather meant deterioration, and this occurred in northwestern Indiana and southern lower Michigan (D1 expansion); new D1 areas in southwest Ohio, southern Indiana, and central Kentucky; and D0 increase across central and eastern Kentucky. 60-day shortages reached 3-6 inches in the new D1 areas, while most of the D0 areas only received 50-70% of normal precipitation. Kentucky had the highest percent short to very short topsoil moisture value (61%), with Iowa, Michigan, Illinois, Indiana, and Ohio not far behind (between 30-42%). Although the dry weather is good for crop maturation and corn dry down, the wet spring delayed planting, so some crops may be behind schedule and could use rain for filling (mainly soybeans).

High Plains

Unsettled weather brought widespread light precipitation to much of the High Plains, especially Montana and the Dakotas, while monsoonal moisture produced scattered showers in Colorado, western Nebraska, and parts of Kansas and Wyoming. With much of the region drought-free, the rains fell on top soils with adequate to surplus moisture. The few areas with D0 or D1 did receive precipitation, and some improvements were made. In northwestern Montana, 2-3 inches of rain in the Mission Mountains and widespread 1-2 inches across Lake and Flathead counties have produced near record maximum stream flows for this time of year. With 60- and 90-day totals now at normal or surplus, D0 was removed, and D1 shrunk to just include Lincoln County where weekly amounts were somewhat lower, and short-term deficits still remained. In North Dakota, another week of rain (0.5-1.5 inches) continued to reduce short and medium-term deficiencies, with D1 removed and the D0 shrunk to better fit dwindling 60-day deficits. In central Colorado, 1-2 inches of rain south of Denver eliminated short-term deficiencies, thus D0 was erased. Farther to the southwest and southeast, however, dry and warm weather increased 90-day deficiencies as the southwest monsoon has been weak and spotty, generating SPIs less than -1.5 on a 30-, 60-, and 90-day time scales. The wet winter and spring is fast becoming a faded memory as the summer heat and dryness continued to assert itself with impacts. Accordingly, D0 expanded into Gunnison, Pitkin, and Saguache counties in the southwest, while D0 increased in Las Animas and Otero counties in the southeast. D1 also slightly crept northward in southwestern Colorado.

West

While precipitation returned to the Pacific Northwest and conditions improved, the Southwest continued to have a disappointing summer monsoon as only scattered light showers fell across central New Mexico and central Colorado. Rains also fell on most of Idaho and western Wyoming as cold fronts squeezed out moisture from the Pacific Ocean and the southwest monsoon. With June-August completed, the precipitation rankings for the Four Corner States were a disappointment. According to NCEI, Arizona had the driest (1) JJA on record, followed by Utah (8), New Mexico (10), and Nevada (12), with records going back to 1895. Combined with much above normal JJA temperatures (New Mexico 6th and Arizona 12th warmest), the beneficial impacts from a snowy winter and cool and wet spring have faded, and have been replaced by summer’s heat, dryness, and negative impacts. The SPEI, which combines precipitation and temperature effects, was the lowest on record for Arizona in August, July-August, and June-August. With this sudden downturn during the past 3 months, impacts have rapidly surfaced, and as a result, a widespread, 1-category deterioration was made to most of Arizona (D1 and D2 expansion) and bordering areas (e.g. southern Utah, southwest Colorado, and western New Mexico). Southeastern New Mexico has also been dry at 60-days, thus D1 expanded there from west Texas. USDA/NASS pasture and range conditions rated poor or very poor have risen to 41% in Arizona and 46% in New Mexico. In sharp contrast, welcome beneficial rains fell across the Northwest, signaling an uptick in precipitation in the region during the past 30-60 days. With locally heavy amounts (2-4 inches) in western Oregon and Washington and USGS stream flows responding, D2 was reduced in the Olympic Peninsula and northern Cascades of Washington; D1 shrunk in northwestern Oregon, southwestern and northeastern Washington and around the Puget Sound; and D0 removed in west-central Oregon. Hopefully the increase in precipitation normally seen during the late summer and fall months will continue to ease the drought.

Alaska, Hawaii, and Puerto Rico

Light to moderate precipitation (1-3 inches, locally to 5) fell along the western, southwestern, and southeastern Alaskan coasts. Although the increased precipitation was welcome, June 1 to date rainfall was still at near-record low levels in south-central Alaska. The 1- and 10-hour fire fuels are significantly moister, but the 100- to 1000-hours and duff layer are still very dry. There has been little or no recovery in soil moisture, even at a 2 inch depth. Several communities continue to have no water remaining, or are very close to running out. The primary concern of the communities is whether they can fill their water storage before winter sets in next month. Therefore, until a longer stretch of wet weather becomes established, no improvements were made. However, the lower Alaskan Peninsula D0 area was erased with the recent wet weather as Cold Bay is back to near normal precipitation since May 1.

In Hawaii, light showers frequented the windward sides of the eastern islands, continuing a recent increase in showers in this area. With the full August statistics available, along with updated NDVI data, surplus rainfall and improved NDVI conditions over portions of the windward slopes in Maui County and the Big Island allowed for some reduction in Dx coverage. On the Big Island, windward slopes of the Kohala Mountains improved from D1 to D0; windward slopes of the Hamakua District went from D2 to D1; D0 area on the leeward slopes of Mauna Kea were reduced in upper and middle elevations; and a 1-category improvement was made near South Point. In Maui County, reduced D0 coverage was favored along the windward slopes of Maui and Molokai. Elsewhere, no other changes were made.

Heavy rains (3-6 inches, locally to a foot) fell along the northwestern, north-central, and far northeastern sections of Puerto Rico, but these areas were mostly drought free. A few areas that observed heavy rains, however, were in D0 or D1 (northeastern and central sections of the island), and a 1-category improvement was made there. 7-day averaged near-record low USGS stream flows were confined to a few sites along the southwestern coast, while the rest of the island was normal or above-normal.

Pacific Islands

The weather pattern during this USDM week (9/4/19-9/10/19) consisted of a continued monsoon trough from the Marianas, northern Palau, and northwest Yap State, southeastward across the Federated States of Micronesia (FSM) to the southern Marshall Islands (RMI). Weak circulations embedded within the monsoon trough slowly migrated westward during the week. Upper-level troughs to the north of the USAPI created a divergent flow aloft that extended over parts of Micronesia, especially in the west, which combined with the monsoonal convergence at the surface to enhance showers and thunderstorms. South of the equator, a surface convergence zone (trough/stationary front) oscillated across the Samoan Island region, competing with stable and more drier air extending into the region from the south and east.

Satellite-based estimates of 7-day precipitation (QPE) showed a mostly continuous band of precipitation extending from the East China Sea and Philippine Sea southeastward across Micronesia into the Southern Hemisphere. Over Micronesia, precipitation amounts in this band were estimated at 2 to 4 inches, with locally up to 10 inches or more, and the rain delineated the monsoon trough. Rainfall amounts tapered off to an inch or less across southwestern Micronesia and over extreme northeastern FSM. South of the equator, the rain band comprised a patchy South Pacific Convergence Zone extending across the Samoan region which was characterized by areas of 2 to 4 inches of rain next to pockets of less than an inch.

The Republic of Palau continued to experience showery weather, with a month-to-date total of 5.81 inches of rain reported at the international airport through the afternoon of September 10. As a result, D-nothing continued.

A showery pattern also persisted in the Mariana Islands, with all major observation sites receiving at least 3 inches of rain during the monitoring period. A D-nothing designation continued throughout the Marianas. Through September 10, month-to-date rainfall totaled 4.37 inches (126 percent of normal) at Saipan/Isley.

In the Federated States of Micronesia, most islands remained wet enough to retain a D-nothing designation. Weekly totals ranged from 6 to 10 inches in several locations, including Fananu, Kosrae, Pohnpei, and Chuuk Lagoon, with nearly all other islands receiving the 2-inch weekly minimum value. One exception was Pingelap, where D0-S was retained due to a weekly sum of 1.30 inches (with 2 days of data missing). Elsewhere, no data was reported from Ulithi and thus no analysis was made.

In the Republic of the Marshall Islands, variable rainfall was generally light or moderately heavy, with most observation sites receiving 1 to 3 inches during the drought-monitoring period. Jaluit remained at D2-SL after receiving 1.11 inches during the week. Meanwhile, short-term dryness was replaced by D-nothing at Kwajalein and Ailinglapalap, courtesy of weekly totals that reached 3.11 and 2.73 inches, respectively. Utirik also received appreciable rain, 3.20 inches, resulting in improvement from moderate drought to abnormal dryness (D1-L to D0-L). Rainfall was a bit lighter at Wotje, where 1.78 inches fell, leaving D1-SL intact. Mili and Majuro retained a D-nothing designation, although the latter location is teetering on the brink of short-term dryness. Majuro’s weekly rainfall totaled 1.07 inches, following an August that featured more than 13 inches. Majuro’s reservoir storage has been dropping in recent days, but stood at 28.838 million gallons (80.1 percent of capacity) on September 11.

In American Samoa, rainfall has been generally light since late August, and D0-S was introduced last week. During the drought-monitoring period, less than an inch of rain fell at two National Park Service observation sites. Rainfall was a little heavier at the Pago Pago Airport, with 1.32 inches reported for the week. Through September 10, the month-to-date rainfall at the airport totaled just 1.35 inches. As a result, D0-S was retained for American Samoa.

Virgin Islands

Scattered showers affected the U.S. Virgin Islands in early September, following Hurricane Dorian’s passage in late August. Although showers were mostly light, a few spots received totals in excess of 2 inches. For example, a CoCoRaHS observer near Christiansted, on St. Croix, reported a weekly sum of 2.45 inches. Several other locations, including King Airport on St. Thomas and a volunteer observer on the northern shore of St. John, received less than an inch. Well reports from the U.S. Geological Survey noted little change in groundwater levels in recent days. Taking all factors, including the Standardized Precipitation Index, into account, D0-L was retained for St. Croix, while D-nothing was maintained for St. Thomas and St. John.

Looking Ahead

Fortunately for the Southeast, Category 5 Hurricane Dorian stalled just east of central Florida, slowly weakened, and gradually turned northward, finally accelerating northeastward into Nova Scotia and Newfoundland. Its only U.S. landfall was at Cape Hatteras. Unfortunately, it stalled over the northern Bahamas for 1-2 days, devastating the islands of Great Abaco and Grand Nassau. Rainfall from Dorian was limited to coastal sections of eastern Florida, the Carolinas, Delmarva Peninsula, Cape Cod, and extreme eastern Maine. Between 5-10 inches of rain, locally to 15 inches, fell along coastal northeastern South Carolina and eastern North Carolina, although the totals sharply dropped off to the west. A second tropical system, Tropical Storm Fernand, made landfall in northeastern Mexico, but its outer bands of rain brought welcome rains to southern Texas. Frequent cold fronts raced across the northern tier of States, dropping light to moderate precipitation on the Northwest, northern Rockies and Plains, Midwest, upper Great Lakes region, and northern New England. Monsoonal moisture produced light showers in western Texas, central New Mexico, Colorado, and into Wyoming and Idaho. Dry weather prevailed in western sections of the Southwest, south-central Plains, lower Mississippi Valley, and across much of the Southeast, eastern Ohio Valley, and mid-Atlantic. Temperatures averaged above-normal across the West, southern two-thirds of the Plains, and across the Southeast, with subnormal readings confined to the northern Plains, upper Midwest, Great lakes region, and Northeast.

During the next 5 days (September 12-16, 2019), the possible development of a tropical system in the western Caribbean and eastern Gulf of Mexico brings enhanced rainfall to the central and eastern Gulf and southern Atlantic Coasts. Elsewhere, the Pacific Northwest should see continued precipitation (0.5-2 inches), while more systems bring rainfall (1-3 inches) to the northern Plains, upper Midwest, and Great Lakes region. Some monsoonal showers should develop in New Mexico and west Texas, with this moisture merging with a cold front that should produce thunderstorms across the south-central Plains. Little or no rain is expected in California, Nevada, most of Arizona, southern Utah, from northeastern Texas eastward to South Carolina, and along coastal New England. Most of the lower 48 States should record above-normal temperatures.

The CPC 6-10 day outlook (September 17-21, 2019) favors above-normal precipitation chances for most of the contiguous U.S. and Alaska, with below-normal odds limited to States along the Northeast Coast. Temperatures are likely to be subnormal from the Rockies westward, while above-normal readings are expected east of the Rockies, especially in the northeastern quarter of the Nation.

Some may find this way of looking at things useful and I hope these graphics are not too small to read. I did not make them so you could click on them individually but you can click on the whole graphic and it may enlarge. But I think you get the picture. It has been a rapid onset and demise. When you read these graphics, remember that the older graphics are not the drought conditions that existed then but the change from then until now.

changes in drought categories September 12, 2019

The biggest changes are the improvement from 6 months ago and 12 months ago.
Recently, the changes both the weekly and the one month have been mostly negative. We will see how that evolves. But this is still a very low level of drought.
Remember when reading this graphic, the 1-year graphic shows the change from then until today. So for some, that may be a bit of an unusual way of looking at things.

Let’s focus on the change between August 13, 2019 through September 10, 2019 i.e. a month. .

Texas, Utah, New Mexico and Arizona have dried out. We are also starting to see some drying in the Great Lakes area and also in the interior of eastern CONUS but there is improvement in the Northwest and adjacent Northern Tier.

Drought Forecasts

First, we show the forecast through November which was issued on August 15, 2019 (to be updated on September 19, 2019). These two forecasts are issued by the same agency but to obtain them you need to access two different links here and here.

Here is the Three-Month Forecast which was issued on August 15, 2019

http://www.cpc.ncep.noaa.gov/products/expert_assessment/sdohomeweb.png

It does not look too bad except for South Texas.

Here is the Monthly Drought Outlook which was updated on August 31, 2019

New August 2018 Drought Outlook

Floods remain a concern but only in a limited area.

September 12, 2019

Last Week Current Week

September 5, 2019

September 12, 2019

The purple triangles are the worst situations. The daily updated map can be obtained here.
Surprisingly it has gotten worse.

Let’s see if this animation works. It shows the pattern for August.

animation

Active Major Fires

Large Fires September 12, 2019

The fire situation in Alaska has improved . Overall it has improved but that might change for the worse but not in the coming week. Updates and more information can be obtained here.

New Wildfire Indicator

 

September 10, 2019

Click here to update. Red is high risk, blue is low risk. This graphic updates daily but you have to click on the link provided to get the updates More information can be found here.

 

New Month Fire risk.

You can see where the risk is high this month: Alaska, the West Coast, and Hawaii.

Looking out another month.

New Month Fire risk.

Alaska is not forecast to be at risk in October.

New Month Fire risk.

The risk is forecast to narrow in November to part of California and Hawaii. The Southeast is now below normal risk.

Crop Progress

Recently, we looked at the individual crop progress reports graphically from this source. Also recently we reviewed this Executive Summary Report which provides projections of the ultimate harvest. We have reviewed the new NASS forecast earlier in this article. It is important to make the distinction between crop progress which we report in this section of our article weekly and forecasts of what the result for the crop will ultimately be and we review that generally once a month as the NASS forecasts are released.

But for now, we will look at the season to date information summary.

September 12, 2019

Further summarizing the above (after cross-checking it with the more detailed information that accompanies that summary report) in the below table.
In some cases where I have not received new information I have shown the last information I received and in other cases I indicated Not Available NA. I should have more information next week.
CropCrop ProgressCrop Condition
CornSlow (Dough) Very Very Slow(Denting and Mature)Very Bad
SoybeansSlow (Setting Pods)Very Bad
Spring WheatVery Slow (Harvested)Bad
CottonGood (Setting Bolls) Slightly Bad (Harvested)Good
SorghumSlow Headed and Very Slow (Coloring) Slow (Mature) Slightly Slow (Harvested)Very Good
RiceSlow (Harvested)Bad
OatsSlow (Harvested)Bad
BarleySlow (Harvested)NA
PeanutsNABad
What we have tried to do is consider that last year many crops were negatively impacted by drought and this year crops were negatively impacted by cold and flooding. So we saw the possibility that some crops might be getting a slow start but be positively impacted by having more water. So we have rated the rate of development separately from the crop condition. This is not a week to week comparison but a comparison to last year but the five-year average and just last year with respect to condition. The actual numbers in most cases appear in the National Agriculture Summery above or in the more detailed tables from the USDA Weekly Crop Bulletin which can be accessed here.
In some cases where new data for a development stage was not provided, we have left the prior rating in the table which in some cases may be misleading as that stage may be completed or almost completed and thus not reported.
One thing to keep in mind is that some research suggests that in the corn belt, hot and dry and cool and moist are more common than hot and moist and cool and dry. But hot and dry and cool and moist tend to be patterns with substantial persistence meaning that if they occur in one month their chances of repeating in the following month are fairly good. Cool and moist might not be helpful right now and hot and dry would be ok if it did not last too long. I am sure the computers are running the models to calculate what the various players in the agriculture sector should do.

The following table summarizes the situation. It has changed just a a bit since last week for cotton.

 Crop development EarlyOKCrop Development Late
Crop Condition Good Cotton

Sorghum

Crop Condition OK  Barley
Crop Condition Bad 

Peanuts

Corn

Soybeans

Spring Wheat

Rice

Oats

On the upper right are crops that are in better condition than last year which was a drought year. Thus these are crops that may be able to catch up if we have a longer growing season and good harvest conditions. The bottom right would be helped by a longer growing season and good harvest conditions but the poor condition of the crop is not an encouraging sign. They are at high risk of having low yields this year.

This provides some additional information: There are many factors that have led to the current situation but one is the amount of sunshine other causes of temperature and it has been inadequate.

September 12, 2019

Side by Side

September 6, 2019

September 12, 2019

I see no improvement.

Pan Evaporation September 12, 2019

Where you have readings of 0.3 or higher it means you need two inches of rain each week to keep up with the evaporation.

International

International Crop Report September 12. 2019

A map helps and is not always available and fortunately, it was not available this week.

September 12, 2019

 

Major Sources of Information

In the box are shown the major resources we use. We will not be using them all each week but the reader is welcome to refer to these resources.

Major Sources of Information Used in this Weekly Report

  • The U.S. Drought Monitor (the full report can be accessed here)
  • Selected graphics from our Weekly Weather and Climate Report are repeated in this report. These provide forecasts for the next 25 days and they auto-update. The full Monday Report, which provides a lot more detail, can be accessed by referencing the Directory here
  • Selections from the Tuesday USD Weather and Crop Bulletin (the full report can be accessed here). Selections from the USDA Office of the Chief Economist can be found here. NASS Executive Briefings can be found here. Other useful sources of information that I regularly utilize are the National Integrated Drought Information System (NIDIS) which can be accessed here and the USDA NRCS Weekly and Weather Climate Update which can be accessed here.

Background Information

Drought severity classification

The sequence of drought occurrence and impacts for commonly accepted drought types. All droughts originate from a deficiency of precipitation or meteorological drought but other types of drought and impacts cascade from this deficiency. (Source: NDMC)

Source: National Drought Mitigation Center, University of Nebraska-Lincoln

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