Atlantic Tropical Weather Discussion (Text)

AXNT20 KNHC 181755

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
155 PM EDT Sun Mar 18 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 1200 UTC surface analysis and satellite imagery through 
1500 UTC. 


The monsoon trough extends from the coast of Africa near 08N13W 
to 04N20W. The intertropical convergence zone continues from that
position to 03N30W to the coast of Brazil near 03N51W. Scattered 
moderate convection is within 90 nm either side of the ITCZ 
between 23W and 38W.



A surface ridge extending from southwest Florida to the Texas
coast is maintaining generally fair weather over the region.
There is no significant rain or shower activity. Winds are nearly
calm over the northeast Gulf near the center of the high pressure
with gentle to moderate southeast winds elsewhere. Seas are 1 to 
3 ft in the eastern Gulf, and 3 to 5 ft in the western Gulf. 

The ridge over the northern Gulf will shift E through tonight 
ahead of a cold front moving off the Texas coast Mon. The front 
will extend from the Florida Big Bend area to Veracruz Mexico 
early Tue, just as a reinforcing push of cold air moves off the 
Texas coast. The reinforcing front overtakes the first front late
Tue, accompanied by strong winds and building seas over the 
northern Gulf. The merged front sweeps southeast of the Gulf by 
early Wed. Winds and seas diminish across the Gulf through late 
Wed as high pressure follows the front across the northern Gulf.


The undersea volcano Kick'em Jenny, located 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/ 3.1 nm exclusion zone around 
Kick'em Jenny. Please see http://nadma.gd for further information.

High pressure east of the Bahamas and a low over N Colombia is
tightening the surface pressure gradient and maintaining moderate
to fresh trade winds over the south central Caribbean, and gentle
to moderate E to SE winds over the northern Caribbean. 25 kt winds
and seas of 8 to 9 ft are off the coast of N Colombia. Scattered 
showers in the tradewind flow are S of Jamaica, but otherwise no 
significant rainfall is noted.

High pressure north of the region will continue to support fresh
to locally strong trades across the south central Caribbean the 
next several days, except increasing to near gale force along the
northwest coast of Colombia during the overnight hours. A 
weakening cold front will pass through the Yucatan Basin late Tue
night. The pressure gradient will tighten ahead of the front,
allowing fresh to strong E to SE winds off the central coast of
Honduras by Mon night.


A cold front extending from 31N46W to 26N60W will exit east of 
the area tonight. Seas are 8 to 11 ft in NW swell in vicinity of
the front. Elsewhere, 1017 mb high pressure is centered near 
25N69W, maintaining light to gentle breezes from 22N to 28N, with
fresh SW winds north of 28N.

The SW winds north of 28N will increase tonight ahead of another
front moving across the waters north of 28N Mon. Southerly winds
will increase to fresh to strong off northeast Florida and north
of the Bahamas late Mon, then increasing further to near gale to
gale force north of 28N with building seas late Tue through Wed 
as low pressure moves off the Carolina coast. A trailing cold
front will sweep eastward, reaching from Bermuda to eastern Cuba
by Wed night. Looking ahead, the front will drift east through
late week, with 7 to 9 ft NW swell propagating across most of the
open waters east of 55W.

Over the eastern Atlantic, 1025 mb high pressure centered near 
29N26W is maintaining gentle to moderate flow over the subtropics
and moderate to fresh trades over the deep tropics. Persistent 
long period NW swell continues to propagate into the region from 
the north central Atlantic, maintaining 8 to 12 ft seas mainly 
east of 55W, as noted in recent altimeter satellite passes. An 
upper trough reaching from roughly the Canary Islands through the 
Cabo Verde Islands to 06N30W is interacting with trade wind 
convergence in the lower levels to support scattered showers and a
few thunderstorms within 90 nm of the intertropical convergence 
zone between 25W and 35W. 

For additional information please visit 


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Page last modified: Sunday, 18-Mar-2018 17:55:35 UTC