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AGXX40 KNHC 220651
MIMATS

Marine Weather Discussion
NWS National Hurricane Center Miami FL
251 AM 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...

A thermal trough will develop over the Yucatan Peninsula each evening before pushing offshore into the SW Gulf each night. The trough will drift westward during the overnight hours, and dissipate 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...

Latest observations report fresh to strong trades in the central Caribbean, 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 the lee of Cuba. These conditions will change little through the next several days with the tightest pressure gradient remaining across the central portion of the basin. One exception will be through the approach to the Windward Passage where NE winds will pulse to fresh to strong the next couple of days.


...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, will prevail, 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.

$$


.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 Lewitsky. National Hurricane Center.

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