Atlantic Tropical Weather Discussion (Text)

AXNT20 KNHC 210002

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
802 PM EDT Tue Mar 20 2018

Tropical Weather Discussion for North America, Central America
Gulf of Mexico, Caribbean Sea, northern sections of South
America, and Atlantic Ocean to the African coast from the
Equator to 32N. The following information is based on satellite
imagery, weather observations, radar and meteorological analysis.

Based on 1800 UTC surface analysis and satellite imagery through 
2345 UTC. 



A cold front is exiting the Georgia and Florida coastlines 
entering the west Atlantic this evening. Gale force southwest 
winds are noted ahead of the front north of 29N and west of 78W, 
with seas building to 9 ft. The Gale Warning will continue through
the next 24-36 hours as the front continues moving east across 
the west Atlantic. Please refer to the High Seas Forecast product 
under WMO/AWIPS headers FZNT02 KNHC/HSTAT2 for more details. 


The same cold front described above extends across the east Gulf
of Mexico from 30N84W to 24N90W then tot he Bay of Campeche. Near-
gale force northwesterly winds with frequent gusts up to gale 
force are noted behind the front north of 26N west of the front to
92W. tHese conditions will continue through the next 18 hours. Please 
refer to the High Seas Forecast product under WMO/AWIPS headers 
FZNT02 KNHC/HSTAT2 for more details.

...GALE WARNING for the METEO-FRANCE areas...

Please refer to the METEO-FRANCE High Seas Forecast, that is 
forecast for the area that is called: AGADIR, TARFAYA, and
CANARIAS. The OUTLOOK, for the 24 hours that follow the forecast 
that is valid until 21/1200 UTC, consists of: the persistence of 
a N or NE near gale or gale in: AGADIR, TARFAYA, CANARIAS, and CAP


The monsoon trough passes through the coastal sections of Sierra
Leone near 08N13W, to 04N20W. The ITCZ continues from 04N20W to 
01N30W, to Brazil near 03N51W. Scattered moderate convection is 
within 120 nm either side of the boundaries between 16W and 30W.



Please read the Special Features section for information about
the Gale Warning in the Gulf of Mexico.

Upper level westerly wind flow is moving across the open waters of
the Gulf of Mexico.

A cold front passes from the Florida Panhandle near 31N85W to
25N90W to N of Tampico Mexico near 23N98W. A surface trough is 
over the SW Gulf from 24N90W to 18N93W. Scattered to numerous
showers and thunderstorms have developed along the front mainly
across the far east Gulf waters east of 84W affecting the Florida

The current cold front will shift SE across the forecast waters, 
moving SE of the area by early Wednesday. High pressure will 
build in the wake of the front.


Undersea volcano Kick'em Jenny, north of Grenada near 12.18N 
61.38W, is in a state of unrest. The government of Grenada advises
mariners to observe a 5 km or 3.1 nm exclusion zone around 
Kick'em Jenny. Please refer to the webpage, www.nadma.gd, for 
additional information.

Broad upper level anticyclonic wind flow spans the area.

A surface ridge passes from the Atlantic Ocean at 23N70W to W 
Cuba near 23N84W. A 1008 mb low is centered over N Colombia. The 
resultant surface pressure gradient will support fresh to locally 
strong trade winds across the south central Caribbean Sea during 
the next several days. Winds will reach near gale force along the 
NW coast of Colombia during the overnight hours. 


Please read the Special Features section for information about
the Gale Warning in the Atlantic Ocean.

An upper level trough is in the central Atlantic Ocean supporting
a surface trough that extends from 32N53W to 28N60W. Scattered 
showers are N of 27N between 46W and 50W.

A surface ridge extends from a 1031 mb high pressure centered near
35N26W to 25N50W.

The surface trough will move eastward today. A strong cold front 
has entered the region off the Florida/Georgia coasts. Numerous 
showers and thunderstorms are noted with the front affecting the 
waters west of 74W. Gale-force winds will continue north of 29N 
through Wednesday night as the front moves eastward. The wind 
speeds and sea heights will diminish on Thursday, as the front 
reaches from Bermuda to the Windward Passage, then continues E and
weakens slowly. 

For additional information please visit 



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Page last modified: Wednesday, 21-Mar-2018 00:03:02 UTC