Marine Interpretation Message
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000
AGXX40 KNHC 201758
MIMATS

Marine Weather Discussion
NWS National Hurricane Center Miami FL
158 PM EDT Thu Jul 20 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...

A weak ridge will dominate the Gulf waters through Saturday
producing gentle to moderate winds and seas of 1 to 3 ft, with
the exception of variable winds and seas of 1-2 ft over the NE
Gulf, where a weak high pressure center will prevail. On Sunday,
as the ridge builds westward, expect moderate to locally fresh
SE to S winds and seas of 3-5 ft across much of the west and SW
Gulf through Monday night.

A thermal trough will develop over the Yucatan Peninsula each
evening before pushing offshore into the SW Gulf each night. The
trough will drift westward during the overnight hours, and
dissipate over the SW Gulf each morning. A surge of fresh to
occasionally strong NE winds will accompany this trough. Seas
will briefly build to 4-6 ft with these winds.

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

Latest scatterometer data along with ship and buoy observations,
depict fresh to strong winds over the central Caribbean, moderate
to fresh winds over the eastern Caribbean, and the Tropical
North Atlantic forecast zones, and gentle to moderate winds over
the western Caribbean. Buoy 42058 located near 15N75W is now
reporting seas to 11 ft while an altimeter pass also indicated
seas to 11 ft across the south-central Caribbean. The ridge
north of the area will weaken this weekend. This will decrease
the aerial extent of the winds with subsiding seas. The ridge
will strengthen early next week which will once again increase
winds and seas, particularly across the south-central Caribbean.
By Monday morning, expect fresh to strong east winds across most
of the waters S of 17.5N and east of 80W, with seas building
again up to 11 ft across the south-central Caribbean.

A very large tropical wave, with axis along 49W will move across
the Tropical North Atlantic forecast zones on Friday, reaching
the Lesser Antilles by Friday night into Saturday morning. A
second tropical wave with axis over the Lesser Antilles will
cross the eastern Caribbean through Friday, reaching the central
Caribbean on Saturday, and the western Caribbean on Sunday.

Pulsing fresh to locally strong winds are expected across the
Windward Passage this evening, and again Friday evening.

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

Scatterometer and surface data depict moderate to fresh winds
over the southern waters, except fresh to strong winds north of
Hispaniola into the Windward Passage, and gentle to moderate
winds elsewhere. Seas are in the 3-4 ft range over the northern
waters, 5-6 ft over the southern waters outside the Bahamas
except reaching 8 ft north of Hispaniola, and 1-3 ft west of the
Bahamas. A ridge, with axis along 29N/30N, will dominate the forecast
region through the weekend and into early next week with little
change in the marine conditions. Pulsing fresh to locally strong
winds are expected just north of Hispaniola, including the approach
to the Windward Passage during the evenings through the upcomimg
weekend.

$$

.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 GR. National Hurricane Center.


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