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AGXX40 KNHC 250838

Marine Weather Discussion
NWS National Hurricane Center Miami FL
438 AM EDT Sun Jun 25 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


Atlc ridge extends W-SW along 29-30N across the W Atlc across
N FL to weak sympathetic high offshore of Tampa Bay then Wwd
across the northern coastal waters to the TX-LA border. Winds
are generally moderate to locally fresh outside the ridge axis,
with recent scat pass showing peak winds near 20 kt in the active
cnvtn across SW Gulf and 15-20 kt through the Straits. Seas
generally 3-4 ft possibly to 5 ft far W and SW part and 1-3 ft E
half except 4 ft in the Straits.

Models show the high over Ern Gulf to shift slightly S today as a
weak frontal boundary sinks SSE towards the N Gulf coasts, with
pre frontal troffing sinking into the NE Gulf tonight. Upper low
and active cnvtn across SW part early this morning will shift
slightly Nwd as low moves NNE and begins to fill. Broad weak llvl
troffing will drift W and SW portions, N of 20N with convergence
and weather to the E of it. Frontal boundary to sink into NE
coastal waters by Mon evening but then drift Nwd and inland Tue.
Expect gentle to moderate winds and seas through Tue with local
effects dominating, particularly the afternoon- evening Yucatan
thermal trough. Next frontal system to move E into Central Plains
Tue night-Wed and induce return

55W AND 64W...

Modest Atlc ridge extending along 29-30N producing sufficient
pres gradient for fresh E trades across much of central portions
of basin early this morning with seas expected to build to 9-10
ft off of Colombia by 12Z. 00Z altimeter data showed seas 7-8 ft
as far N as 16.5N along 75W and 6-7 ft N of there to 18N. This
area of winds being supported by low lat tropical wave along
73W, with next larger tropical wave along 60W attm with bring
active weather into Lesser Antilles and E Carib today and tonight
as wave moves under upper ridge. Winds to around 20 kt and seas
6-8 ft attm across tropical Atlc waters associated with this
wave. Leading wave to slow down slightly next few days as it
approaches monsoonal flow across EPac and Central America while
second wave closes distance between the two and will create a
broad area of fresh to strong trades across most of Carib E of
80W tonight through Mon morning then shifting Wwd Mon afternoon-
eve then max winds recentering central portions Tue as Atlc ridge
shifts slightly NE. GFS suggests winds off Colombia to pulse to
near 30 kt late tonight. Next tropical wave across central Atlc
attm accompanied by large swath of SAL and plume of significant
dust that will reach tropical Atlc waters Mon and shift Wwd
across the Leewards and into NE Carib Mon night and Tue for
reduced vsbys. The leading 2 waves will move across SW portions
and into Central America Tue-Wed with trades veering slightly SE
to the W of 80W in response to return flow developing across Gulf
of Mexico.


A 1026 mb high is centered over the central Atlc near 48W and
extends ridge wwd along 29-30N to N FL producing moderate to
fresh E trades S of 23N across the SE waters and through Srn
Bahamas. The ridge will weaken slightly tonight through Mon as a
weak frontal boundary moves to the GA-SC coasts with a pre
frontal trough out ahead of it, and sfc high shifts slightly NE.
Expect trades S of 25N to veer SE on Mon as front reaches Atlc
coasts then retreats inland Tue. Front to then shift E into the W
Atlc Tue night into Wed and dragging across Nrn waters through
Thu with weak high pres building off mid Atlc coast behind it.


.WARNINGS...Any changes impacting coastal NWS offices will be
coordinated through AWIPS II Collaboration Chat, or by


55W AND 64W...



*For detailed zone descriptions, please visit:

Note: gridded marine forecasts are available in the National
Digital Forecast Database (NDFD) at:

For additional information, please visit:


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