Marine Interpretation Message
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000
AGXX40 KNHC 161901
MIMATS

Marine Weather Discussion
NWS National Hurricane Center Miami FL
301 PM EDT Wed Aug 16 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 main feature continues to be the western extension of
the Atlantic sub-tropical ridge that reaches across the central
Gulf, with a 1019 mb center at 28N84W at 16/1200 UTC. The
associated anticyclonic flow consists of light to gentle winds in
the basin.

Moderate to fresh southerly winds being observed in the far
western Gulf will diminish this afternoon, then briefly
materialize tonight before diminishing again on Thursday. Seas to
6 ft associated with these winds will lower to around 4 ft on
Thursday. The ridge will lift northward to the northern Gulf on
Friday, and remain nearly stationary through the weekend.
Moderate NE to E winds over the eastern Bay of Campeche will
pulse to fresh to strong at night through the period.

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

A tropical wave is analyzed near 84W at 18Z, moving westward at
20-25 kt. The wave will move across the remainder of the western
Caribbean through Thursday. A broad tropical wave is in the
eastern part of the area, with rainshowers around it. This wave
will move quickly through the Tropical N Atlantic waters
through Thursday afternoon, across the central Caribbean Thursday
beginning late Thursday afternoon through Friday afternoon, and
the western Caribbean Friday night through Saturday evening. The
next tropical wave or low pressure system will move across the
eastern Tropical N Atlantic waters Thursday afternoon, and the
rest of the Tropical N Atlantic through Friday morning, then
across the eastern Caribbean Friday afternoon through Saturday
night and the central Caribbean Sunday and Sunday night. Fresh to
strong winds, locally gusty at times, will accompany this system
along with scattered to numerous showers and thunderstorms.

Scattered showers and thunderstorms in the far SW Caribbean will
continue to pulse from time to time through the forecast period.

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

The sub-tropical Atlantic ridge will become established along
along 27N through tonight. It will then shift N to near 28N
Thursday through Friday, N to 29N on Saturday and to along 31N on
Sunday. The northern part of a broad tropical wave is passing
across the far SE portion of the area. Associated scattered
showers and isolated thunderstorms cover most of that zone. The
wave is moving through the eastern Caribbean now. The pressure
gradient that exists between it and the Atlantic ridge will
increase the winds and wave heights in the far southern waters
tonight through at least early Friday afternoon, with easterly
winds reaching the fresh to locally strong range and seas
expected to build to around 6 or 7 ft.

A 1010 mb low pressure center is near 14N along a tropical wave
that is along 35W. This low center is in the medium category for
possible development into a tropical cyclone in 48 hours. A
second 1010 mb low pressure center is near 14N along a tropical
wave that is along 47W. This low center also is in the medium
category for possible development into a tropical
cyclone.

$$

.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 MT. National Hurricane Center.


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