Marine Interpretation Message
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490
AGXX40 KNHC 231705
MIMATS

Marine Weather Discussion
NWS National Hurricane Center Miami FL
105 PM EDT Fri Jun 23 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...

Remnant circulation of Cindy exiting the area with winds and seas
decreasing across the northern waters. Atlantic ridge will build
westward over the northern Gulf through Saturday night as Cindy
lifts out. Model guidance shows a weak cold front will approach
the northern Gulf coast and briefly stall then sink slowly along
the coast Mon and Tue, increasing chances for showers and TSTMS
over far northern waters. Elsewhere, an upper low and tropical
wave in NW Caribbean will move NW across Yucatan overnight then
move WNW across the western Gulf through Sunday, enhancing the
convection from the associated surface trough, more likely to
occur north of the Bay of Campeche.

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

A tropical wave, which includes the dissipated remnants of Bret,
is interacting and moving in tandem with an upper low centered
over Yucatan near 18N89W to enhance convective activity in the NW
Caribbean. A scatterometer pass at 0300 UTC showed 20-25 kt ESE
winds south of the Cayman Islands, but the most recent ASCAT pass
at 1444 UTC shows much lighter winds in this same area. Marine
conditions are expected to improve further tonight as the wave
moves west into Central America. Light and variable winds across
the SW Caribbean have displaced the Colombian speed max farther
north than usual. The mid Atlantic ridge will shift westward this
weekend, with max winds off Colombia returning to more typical
position of 11-13N between 70-77W, supporting seas to 8-9 ft. A
low latitude tropical wave in the SE Caribbean will move westward
remaining south of 14N this weekend, while the next energetic
wave currently along 46W will move across the tropical N Atlantic
waters Saturday and Saturday night, and reach the E Caribbean
Sunday. A very large tropical wave exiting Africa will reach the
central Atlantic Mon, with a large area of dry Saharan air and
extensive dust reducing visibilities expected west of the wave.

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

High pressure will dominate the region during the next few days,
with the ridge axis meandering along 30N through the weekend. A
weak cold front will reach near 31N Monday night, helping erode
the ridge axis briefly across the NW marine zones late Mon and
Tue. Modest strengthening of the mid Atlantic ridge the next
couple of days will help maintain fresh trades south of 23N into
the southeastern Bahamas through 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:
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 Mundell. National Hurricane Center.



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