AGXX40 KNHC 260840
Marine Weather Discussion
NWS National Hurricane Center Miami FL
440 AM EDT Mon Jun 26 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...
Generally tranquil wind and wave conditions prevail across the
Gulf this morning, except for the SW quarter where gusty winds
near active convection associated with upper low and long lost
tropical wave has begun to diminish. Outside of cnvtn, winds are
15 kt or less and seas 4 ft or less basin wide.
A weak frontal boundary has shifted S into the far NE coastal
waters from near mouth of the MS to FL Big Bend region with high
pressure behind front across the central U.S. bridging SE and weakly
across the boundary. Front to dip a bit farther SSE today before
being dragged Ewd across the W Atlc and beginning to lift back
inland across the NE Gulf coasts Tue. The high behind front will
shift E to E coast of U.S. Wed as next frontal system and low
moves into Great Plains and allow high to open up across Gulf for
fresh return flow W half that will become fresh to strong into
Fri. Diurnal thermal trough across Yucatan will enhance winds and
seas across S central portions off the peninsula each evening
during that time.
...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN
55W AND 64W...
Atlc ridge remains centered across the central Atlc extending WSW
along 29-30N to FL coast near Cape Canaveral. This producing
modest pres gradient across Carib E of 80W with pair of tropical
wave enhancing trades across the basin. Late evening scat passes
showed 20-25 kt winds across S central portions from 64W to 77W
where seas are 6-10 ft. Low lat tropical wave is S of 13-14N
along 81-82W and moving into CA attm, while next wave along
68-69W will move across central Carib today and W portions
tonight through Tue night. Models and scat pass show strong SE
winds behind second wave axis driving cnvtn earlier where seas
were to 9 ft around 00Z but have since diminished slightly. Next
large tropical wave is quickly approaching 50W with broad area of
SAL across the top and well ahead of this wave, and not moving
across the Lesser Antilles. This stable air will spread across
the tropical N Atlc waters next 24 hours and across portions of E
Carib, with a NE-SW aligned area of dense dust likely to limit
vsbys less than 6 nm as it moves Wwd ahead of wave axis next few
days. 7-8 ft seas in ENE swell will accompany this wave as it
move across tropical Atlc waters Mon night through Tue.
..SW N ATLANTIC INCLUDING THE BAHAMAS...
Atlc ridge is centered on 1025 mb high near 32N49W and extends
WSW to central FL coast as mentioned above. Light to gentle
anticyclonic flow prevails around the ridge except for moderate
to fresh trades S of 25N and into the Bahamas, where seas are 5-6
ft attm. Weak frontal boundary will move SE off GA and N FL
coastal waters today and drag Ewd along about 30N through Wed, as
high shifts NE and ridge axis moves SE to the NW Bahamas. This to
produce a slight diminishing in winds, and veering to SE to S W
of 70W ahead of weak front and pre frontal trough moving Ewd
across the NW waters. SAL to move across NE Carib and into SE
waters tonight and Tue and reach SE Bahamas by Wed before being
shunted SW across Cuba and N Carib Thu.
.WARNINGS...Any changes impacting coastal NWS offices will be
coordinated through AWIPS II Collaboration Chat, or by
.GULF OF MEXICO...
.CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN
55W AND 64W...
.SW N ATLANTIC INCLUDING THE BAHAMAS...
*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:
.Forecaster Stripling. National Hurricane Center.