Marine Interpretation Message
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000
AGXX40 KNHC 190817
MIMATS

Marine Weather Discussion
NWS National Hurricane Center Miami FL
417 AM EDT Sat Aug 19 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...

High pressure is centered in the N central Gulf near 28N87W with
a ridge extending from east to west, maintaining generally light
to moderate flow across the basin. Seas remain 1 to 3 ft, with
highest seas in the western Gulf. An upper level low over the
southeast Gulf near 24N83W is supporting scattered showers and
isolated thunderstorms in the eastern Gulf. The upper level low
will continue to move WNW while the northern extent of a
tropical wave, currently moving through the SE Bahamas,
approaches the basin. The tropical wave will enter the SE Gulf
tonight, moving across the basin through early next week.

Meanwhile, Tropical Storm Harvey currently well southeast of the
area entering the eastern Caribbean is forecast to approach the
northwest Caribbean and Yucatan Peninsula Tue into Tue night,
before emering into the Bay of Campeche Wed. While Harvey will
weaken to some extent overland, it is forecast retain minimal
tropical storm strength as it moves across the far southwest
Gulf through mid week. Please refer to http://hurricanes.gov for
more information on Harvey.

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

Tropical Storm Harvey is about 245 nm south of St Croix in the
USVI, and continues to move westward through the southeast
Caribbean. Sustained winds are 35 kt with gusts to 45 kt.
Minimum central pressure is 1005 mb. Numerous showers and
scattered thunderstorms are within 240 nm in the SW semicircle of
Harvey. Harvey is expected to continue westward across the
central Caribbean through Sun, moving into the northwest
Caribbean and approaching the Yucatan Peninsula Tue and Tue night
as a strong tropical storm. Harvey will remain a relatively
compact system, with an envelope of strong winds and seas 8 to 12
ft within 120 nm of the center on the northern semicircle.
Please refer to http://hurricanes.gov for more information on
Harvey.

Ahead of Harvey, a tropical wave currently moving across central
Cuba and across the waters between Cayman Brac and central
Panama will follow an upper low across the western Caribbean
through early Sun, accompanied by a few showers and thunderstorms
across mainly the northwest Caribbean.

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

A large and well defined upper low centered over the Straits of
Florida and southeast Gulf is moving WNW and is supporting
isolated convection over portions of the Bahamas and eastern
Cuba. The northern extent of a tropical wave is moving through
the Cay Sal area of the Bahamas in the wake of the upper level
low. Fresh easterly winds follow the tropical wave over the
waters S of 22N and W of 70W as noted in a 0230 UTC
scatterometer
pass. Meanwhile, a ridge extends along roughly 29N.

Fresh easterly winds will expand across the waters S of 25N with
locally stronger winds near the coast of Hispaniola as Tropical
Storm Harvey passes S of the region through early next week.

A second feature, an area of active weather approximately 400 nm
to the northeast of the Leeward Islands, associated with the
northern portion of a tropical wave, will move WNW, eventually
reaching the southern and central Bahamas by Sun night.
Environmental conditions are expected to be only marginally
conducive for development during the next few days due to strong
upper level winds. Even so, the low will bring strong winds and
building seas to the area S of 25N from Sun through mid week.
The ridge along roughly 29N will move little through Sun, then
will shift slowly northward early next week, maintaining light to
gentle breezes into early next week N of 28N, with short period
southeast swell of 4 to 6 ft.

$$

.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...
.AMZ019...CARIBBEAN FROM 15N TO 18N BETWEEN 80W AND 85W...
     Tropical Storm Warning Sun night.
.AMZ021...CARIBBEAN FROM 15N TO 18N BETWEEN 72W AND 80W...
     Tropical Storm Warning tonight into Sun night.
.AMZ029...W CENTRAL CARIBBEAN FROM 11N TO 15N W OF 80W...
     Tropical Storm Warning Sun night.
.AMZ031...CARIBBEAN FROM 11N TO 15N BETWEEN 72W AND 80W
INCLUDING COLOMBIA BASIN...
     Tropical Storm Warning tonight into Sun night.
.AMZ033...CARIBBEAN S OF 15N BETWEEN 64W AND 72W INCLUDING
VENEZUELA BASIN...
     Tropical Storm Warning early today into tonight.

.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 Christensen. National Hurricane Center.



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