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Marine Weather Discussion (Text)



000
AGXX40 KNHC 260720
MIMATS

Marine Weather Discussion
NWS National Hurricane Center Miami FL
320 AM EDT Wed Jul 26 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...

Divergence aloft around an upper low centered over the western 
Gulf is supporting scattered strong thunderstorms W of 90W. 
Persistent ridging across the northern Gulf of Mexico will 
maintain gentle winds and seas mainly 2 ft or less N of 22N 
through the remainder of the week and into the first half of the 
upcoming weekend. A weak cold front will approach the N central 
and NE Gulf by the second half of the weekend, with winds 
increasing and seas building over the NE Gulf as a result. A 
trough related to hot daytime temperatures over the NW Yucatan 
will form each afternoon and move westward across the far SW 
Gulf through the evening and overnight hours, enhancing winds
to moderate to fresh.

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

Ridging N of the area continues to support fresh to strong trade
winds over the S central Caribbean, mainly NW of the coast of 
Colombia and western Venezuela. Buoy observations and recent 
altimeter satellite data show seas of 8 to 11 ft in the S central
Caribbean. Moderate to locally fresh trade winds are noted 
elsewhere, except across the approach to the Windward Passage 
where recent scatterometer data showed a pulse of fresh to strong
NE flow, which will diminish by early morning. The winds and 
seas across the S central Caribbean will diminish slightly and 
shrink in coverage as the ridge weakens and a tropical wave moves
across the basin. This will leave the area of strong trade winds
limited to the coastal areas NW-N of Colombia and western 
Venezuela by the end of the week and through the upcoming 
weekend.

In the tropical N Atlantic, moderate trades will prevail through
the remainder of the week and into the upcoming weekend, along 
with 4 to 6 ft seas. A surge of fresh trades will follow the 
passage of a tropical wave by late in the weekend into early 
next week, building seas to 6 to 8 ft N of 10N.

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

Ridging extending from high pressure in the central Atlantic
will support gentle to moderate winds N of 23N through early 
Friday, with moderate to fresh trades S of 22N, pulsing briefly 
to strong N of Hispaniola to the Windward Passage through early
this morning. Southwesterly flow around the ridging will 
increase off NE Florida and north of Grand Bahama starting Friday
morning, as troughing deepens over the Carolinas. Model guidance
suggests weak low pressure along a sagging weak front dropping 
southward from Georgia into northern Florida by the end of the 
weekend, with the associated front laying down just N of 31N by 
late Sunday.

$$

.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:
www.nhc.noaa.gov/abouttafbprod.shtml#OWF

Note: gridded marine forecasts are available in the National
Digital Forecast Database (NDFD) at:
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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Page last modified: Wednesday, 26-Jul-2017 07:20:38 UTC