Marine Interpretation Message
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702
AGXX40 KNHC 181711
MIMATS

Marine Weather Discussion
NWS National Hurricane Center Miami FL
111 PM EDT Fri Aug 18 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 28N90W with
a ridge extending from E to W. Latest observations show light to
moderate anticyclonic flow across the basin, except locally to
moderate. Seas are 1 to 3 ft, highest in the western Gulf. An
upper level low approaching the Straits of Florida 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 Saturday night, moving across the basin through early
next week.

Meanwhile, Tropical Storm Harvey currently well SE of the area
entering the eastern Caribbean is forecast to approach the NW
Caribbean and Yucatan Peninsula Tue into Tue night. Uncertainty
remains as far as the exact strength and track of Harvey that
late in the forecast period. Tropical Storm Conditions are
Possible in the SW Gulf Tue. 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 in the process of entering the eastern
Caribbean, centered near 13 nm SSW of St. Vincent and 43 nm SSW
of St. Luica. Maximum 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 western Caribbean
early next week. Harvey is forecast to move into the NW Caribbean
and approach the Yucatan Peninsula Tue and Tue night, although
uncertainty remains with respect to the strength and exact track
of Harvey that late in the forecast period. 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 eastern
Cuba and across the waters between Jamaica and Haiti to NW
Colombia will follow an upper low across the western Caribbean
through Sat, accompanied by a few showers and thunderstorms
across mainly the northwest Caribbean. Associated convection is
currently ongoing across the approach to the Windward Passage.

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

A large and well defined upper low centered over central Cuba and
moving into the Straits of Florida 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 SE 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. 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 through
today into Sat as Tropical Storm Harvey passes S of the region
through early next week.

A second feature, an area of low pressure to the SE approaching
the tropical N Atlantic, is moving WNW toward the region. Some
potential exists for this low to develop into a tropical cyclone
during the next couple of days as it approaches the area. Strong
upper level winds may weaken it before it crosses 65W to the N
of Puerto Rico by early Sun. 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...
.AMZ021...CARIBBEAN FROM 15N TO 18N BETWEEN 72W AND 80W...
     Tropical Storm Warning Sat night into Sun.
.AMZ031...CARIBBEAN FROM 11N TO 15N BETWEEN 72W AND 80W
INCLUDING COLOMBIA BASIN...
     Tropical Storm Warning Sat night into Sun.
.AMZ033...CARIBBEAN S OF 15N BETWEEN 64W AND 72W INCLUDING
VENEZUELA BASIN...
     Tropical Storm Warning tonight into Sat night.
.AMZ035...OFFSHORE WATERS WINDWARD ISLANDS INCLUDING TRINIDAD
AND TOBAGO...
     Tropical Storm Warning 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 Lewitsky. National Hurricane Center.



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