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posted on 22 September 2017

Bahamas Next But Reduced - Puerto Rico Impacts Continue - 22Sep2017

Written by Sig Silber


This Article has been updated. You can access the updated Article by clicking on: Out to Sea but is the Track Forecast Reliable? - 23Sep2017


5:20 PM EDT Sept 22, 2017: LATEST FROM NHC: "...MARIA PASSING TO THE EAST OF THE SOUTHEASTERN BAHAMAS..."THE GOVERNMENT OF THE BAHAMAS HAS CHANGED THE HURRICANE WARNING FOR THE TURKS AND CAICOS ISLANDS AND THE SOUTHEASTERN BAHAMAS TO A TROPICAL STORM WARNING."

Special Landing Graphic for Possible Hurricane Maria - Bahamas Next

But the Maria Track does not provide comfort that we will not here from Maria again re CONUS Northeast and Canada


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Damage Reports from the recent impacts of Hurricane Maria start to trickle in. Here is one. And here is an impact assessment and analysis and an update from the same source.    This report is focused on Puerto Rico. Our coverage on impacts will expand as more information becomes available.

Preliminary Puerto Rico Rainfall Totals

This report is particularly concerning.

This is an active period in the tropics so we are starting with the overview of the situation in both the Pacific and the Atlantic even though right now only the Pacific presents major threats. Those potentially impacted by any of these storms should consult their local sources of information. The Public Advisories and other information that is available from the NOAA National Hurricane Center can be found here. Information from the Weather Prediction Center can be found here.

First the Atlantic

Eastern Tropical Pacific 

More Detail

Antilles

Map Source: Kmusser

And now the Pacific

Eastern Tropical Pacific

We start our Report with Hurricane Maria. The"M" Designation means a very powerful storm: Category 3 or higher.  

Tropical Depression 15

Maria Wind Speed Probabilities

And the Discussion

Hurricane Maria Discussion Number 27 NWS National Hurricane Center Miami FL 500 PM EDT Fri Sep 22 2017

A ragged eye has re-appeared during the past several hours, but overall the satellite presentation of Maria has not changed much during the past several hours.  The initial intensity is therefore held at 110 kt pending data new data from an ongoing NOAA research mission and an upcoming Air Force Reserve flight.  According to various analyses, Maria is under the influence of 20 kt of shear from the southwest, which has apparently eroded the eyewall a bit on that side of the storm.  This shear may abate some in about 24 hours, although Maria will also be moving over an area of gradually lowering oceanic heat content.  Maria's intensity is therefore only expected to decrease very gradually during the next 48 hours.  After that time, the shear is expected to pick up again, and Maria will be moving over the cold wake left behind by Jose. As a result, a steadier weakening should ensue on days 3 through 5. The NHC intensity forecast remains closest to the ICON intensity consensus and is relatively unchanged from the previous advisory.

Maria is turning around the southwestern periphery of a mid-level high centered south of Bermuda, and the initial motion estimate is 335/8 kt.  The hurricane should turn northward by 36 hours when it moves between the high and a developing cut-off low near the U.S. Gulf coast, and that northward motion, with some east-west wiggles, is likely to continue through day 5.  The new track models have shifted significantly westward on this cycle, leaving the interpolated version of the previous forecast (OFCI) by itself on the eastern edge of the guidance suite.  Oddly enough, the ECMWF model went from being on the west side of the guidance envelope to the east side, so the westward shift of the new NHC forecast on days 3 through 5 only goes as far as that model and the TVCN consensus.

KEY MESSAGES:

1. Flooding continues in portions of Puerto Rico and the Dominican Republic due to Maria's heavy rains over the past few days. Continue to follow advice from local officials to avoid these life-threatening flooding conditions.

2. Swells from Maria are affecting the coast of the southeastern United States and will likely cause dangerous surf and life-threatening rip currents for the next several days.

3. Maria will move between the east coast of the United States and Bermuda by the middle of next week, but it is too soon to determine what, if any, direct impacts there might be in these areas.

4. For more information on the flooding and rip current hazards in the United States, please monitor information from your local National Weather Service forecast office at www.weather.gov.

FORECAST POSITIONS AND MAX WINDS

INIT  22/2100Z 23.3N  71.4W  110 KT 125 MPH

12H  23/0600Z 24.3N  71.8W  105 KT 120 MPH

24H  23/1800Z 25.9N  72.2W  105 KT 120 MPH

36H  24/0600Z 27.5N  72.5W  100 KT 115 MPH

48H  24/1800Z 28.8N  72.5W   95 KT 110 MPH

72H  25/1800Z 30.7N  72.0W   85 KT 100 MPH

96H  26/1800Z 32.5N  72.0W   75 KT  85 MPH

120H  27/1800Z 34.5N  71.5W   65 KT  75 MPH

Vertical Wind Shear is one factor now starting to diminish Maria.

Effects of vertical wind shear

Learn more about wind shear here.

Here is the current Track Map for Jose. 

Tropical Storm Jose

Notice the remnants of Jose are now projected to mover further offshore.

Final Jose Discussion

Post-Tropical Cyclone Jose Discussion Number 70 NWS National Hurricane Center Miami FL 500 PM AST Fri Sep 22 2017

After 70 advisories, enough is enough.  The tropical-storm-force winds from Jose have finally subsided and moved out of the southern New England.  Thus, the wind hazard to land has decreased, and this will be the last advisory on Jose since it is already post-tropical. A slow decay over cold water is forecast while the low drifts southeastward to southward.  The cyclone should degenerate into a trough within 3 days as forecast by the global models.

The swell and rip current threat will remain across large portions of the U.S. east coast for quite some time, due to the wave field from both Jose and Maria.

FORECAST POSITIONS AND MAX WINDS

INIT  22/2100Z 39.3N  69.1W   40 KT  45 MPH...POST-TROPICAL

12H  23/0600Z 39.1N  69.1W   35 KT  40 MPH...POST-TROPICAL

24H  23/1800Z 38.7N  68.7W   30 KT  35 MPH...POST-TROP/REMNT LOW

36H  24/0600Z 38.4N  67.9W   25 KT  30 MPH...POST-TROP/REMNT LOW

48H  24/1800Z 38.2N  68.0W   25 KT  30 MPH...POST-TROP/REMNT LOW

72H  25/1800Z...DISSIPATED

General Weather Situation

We believe that it is easier to understand what is going on with individual storms if they are put into the context of the overall weather situation.

Three day

The graphic above is particularly useful as it shows the forecasted conditions that might determine the future of a storm beyond the predictions of where the storm might be on Day 3. This graphic is updated frequently. There is still a possibility that Maria and Jose will interact at least indirectly.

Some of the graphics below show the two storms of most interest.

Day 1 Forecast Map

Day 2 Forecast

This is a Day 2 Forecast.  Notice Jose has been Downgraded but is still hanging around.

Additional Graphics

More explanation on Atmospheric Rivers can be found by clicking here or if you want more theoretical information by clicking here.

Atmospheric Rivers

This 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. This graphic is very relevant as one can see both storms of most interest in this graphic. .

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.

Precipitation Forecast

You can see the forecast for seven days of cumulative precipitation. It is important to keep in mind that these are forecasts going forward. Precipitation that has already occurred does not show up in these forecasts but will show up in the 30 day maps we show in our weekly Weather and Climate Report. That did not show up in our September 11 Report but did show up in the September 18 Report that was issued Monday evening click here to read. You can see the current QPF for Jose. The remaining precipitation is no longer extreme. Separate from these two hurricanes we see a concerning situation for Southwest Texas. It is also tropical moisture.

 Water Vapor Imagery

The water vapor imagery is a good guide to where precipitation is occurring. Jose seem to be impacting Cape Cod and points north right now. Impacts of Jose seem to be coming to an end.

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

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