Marine Interpretation Message
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153
AGXX40 KNHC 240720
MIMATS

Marine Weather Discussion
NWS National Hurricane Center Miami FL
320 AM EDT Mon Jul 24 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 through midweek, 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 while seas briefly build to 4 to 6 ft. The strongest
surge of winds is occurring right now, and will diminish through
sunrise. A weaker thermal trough is expected by the end of the
week.

Otherwise, a ridge axis extends from the Texas coastal plains
across the NW Gulf to across SW Florida. Recent observations show
moderate to locally fresh return flow in the NW Gulf, with gentle
to moderate anticyclonic flow elsewhere across the basin. Seas
are up to 3 to 5 ft in the NW Gulf, 2 to 4 ft in the SW Gulf, and
2 ft or less elsewhere. These conditions are forecast to persist
through Tuesday night. The pressure gradient will slacken
thereafter as a trough or weak front passes into the NE Gulf.
Gentle winds and seas of 2 ft or less will then prevail across
the basin by the end of the week.

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

Recent observations indicate the continued presence of fresh to
strong trades in the central Caribbean due to a locally tight
pressure gradient, where seas are also building up to 8 to 11
ft. Moderate to fresh trades prevail elsewhere, along with seas
of 3 to 5 ft, except 2 to 3 ft in the lee of Cuba. The area of
fresh to strong trades will expand westward to near 82W by
Tuesday morning in the wake of a departing tropical wave, as high
pressure N of the area of the Atlantic builds westward. The area
of fresh to strong trades will then become confined to the S
central waters by the end of the week as the Atlantic ridge
weakens.

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

Ridging extends from 1022 mb high pressure near 28N61W to the
Space Coast of Florida. Moderate to locally fresh anticyclonic
winds exist around the outer periphery of the ridge from N of
Hispaniola, to between Florida and the Bahamas, to offshore of
the Carolinas, where seas are 3 to 5 ft. Gentle to moderate
anticyclone winds are found elsewhere, along with seas of 2 to 4
ft. Little change in these conditions is expected through early
Tuesday. A trough will then move in from the E-SE through mid-
week, weakening the ridge with the parent high lifting N of the
area. This will allow for a slackening pressure gradient with
winds diminishing, and seas subsiding slightly through Thursday.
A frontal system is forecast to move through the SE United
States by the end of the week which will increase the pressure
gradient, especially across NW portions where winds will increase
to fresh Friday night.

$$

.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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