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AGXX40 KNHC 221733
MIMATS

Marine Weather Discussion
NWS National Hurricane Center Miami FL
133 PM EDT Sat Jul 22 2017

Marine Weather Discussion for the Gulf of Mexico, Caribbean Sea, and Tropical North Atlantic from 07N to 19N between 55W and 64W and the Southwest North Atlantic including the Bahamas


...GULF OF MEXICO...

The typical thermal trough will develop over the Yucatan Peninsula each late afternoon-evening before pushing offshore into the SW Gulf each night, drifting westward during the overnight hours, then dissipating over the SW Gulf each morning. A surge of mainly fresh NE winds will accompany this trough. Seas will briefly build to 4 to 6 ft with these winds.

Otherwise, a weak ridge stemming from high pressure in the SE Gulf will dominate through this afternoon producing gentle to moderate winds and seas of 1 to 3 ft, with the exception of the eastern Gulf, where variable winds and seas of 2 ft or less will prevail. On Sunday, as the ridge builds westward, expect moderate to locally fresh SE to S winds, and seas of 3 to 5 ft across much of the W and SW Gulf through Tuesday night, where the pressure gradient will be tighter. The gradient will then slacken thereafter as a trough or weak front passes into the NE Gulf.


...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W...

Recent observations show fresh to strong trades in the central Caribbean all the way to S coast of Hispaniola, and mainly moderate to fresh trades elsewhere. Seas are 6 to 8 ft in the central Caribbean, and mainly 3 to 5 ft elsewhere, except 2 to 4 ft in lee of Cuba, and lee of Lesser Antilles. A tropical wave reorganizing across the central Carib past 24 hrs is moving to 80W attm and will enter central America Sun through Mon. This will allow Atlc ridge to build slightly across the basin for more Ely flow basin wide, and strongest winds and seas remaining across the central portion of the basin. Moderate to fresh E trades will return to E portions in the lee of the Lesser Antilles on Sun for more typical conditions.


...SW N ATLANTIC INCLUDING THE BAHAMAS...

High pressure ridging will continue to control the sensible weather for the next several days. Mainly moderate anticyclonic winds around the ridge, which will linger between 28N/29N, except in the waters S of 22N and W of 65W where trades will pulse to fresh to strong from N of Hispaniola to the Windward Passage during the evening hours. Seas will be mainly 3 to 5 ft, except 2 ft or less in the lee of the Bahamas, and 5 to 7 ft occasionally N of Hispaniola to the Windward Passage. N portion of tropical wave energy and moisture will move WNW across the SE waters through tonight and then across the SE then central Bahamas Sun night through Tue with slight increase in winds and seas behind it as will as modest increase in weather.

$$


.WARNINGS...Any changes impacting coastal NWS offices will be coordinated through AWIPS II Collaboration Chat, or by telephone:


.GULF OF MEXICO... None.


.CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN 55W AND 64W... None.


.SW N ATLANTIC INCLUDING THE BAHAMAS... None.

$$

*For detailed zone descriptions, please visit: http://www.nhc.noaa.gov/abouttafbprod.shtml#OWF

Note: gridded marine forecasts are available in the National Digital Forecast Database (NDFD) at: http://www.nhc.noaa.gov/marine/grids.php

For additional information, please visit: http://www.nhc.noaa.gov/marine

$$


.Forecaster Stripling. National Hurricane Center.

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