Atlantic Tropical Weather Discussion (Text)

AXNT20 KNHC 181130

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
630 AM EST Mon Dec 18 2017

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 0600 UTC surface analysis and satellite imagery through 
1045 UTC.


...Gale Warning in the Caribbean Sea...

Pulsing nocturnal NE-to-E winds to gale-force are expected again 
during the early morning hours today from 11N to 13N between 73W 
and 76W off the coast of Colombia. Expect sea heights to range 
from 10 to 15 feet. Wind speeds will be drop below gale-force by 
afternoon, then resume during the early morning hours Tuesday. 
Please read the latest NHC High Seas Forecast under AWIPS/WMO 
headers MIAHSFAT2/FZNT02 KNHC for more details. 


The monsoon trough extends from 06N10W to 04N22W. The ITCZ 
continues from 04N22W to 04N43W. Precipitation: scattered 
moderate north of the ITCZ from 05N to 11N between 34W and 42W.



A surface trough extends across the basin from southern Lousiana 
to the coast of Mexico near 22N98W. Scattered moderate showers 
are NW of a line from 30N86W to 24N98W. The trough will lift 
northwestward today into Texas. A ridge will dominate the Gulf 
waters through Tue. A weak cold front will reach the coast of 
Texas Tue night, extend from SE Louisiana to near Brownsville TX 
Wed morning, then dissipate by Wed night. 


Please refer to the Special Features section for details about 
the gale warning near the coast of Colombia during the next two 
days. Broad mid-level anticyclonic wind flow and relatively dry 
air in subsidence span the entire Caribbean Sea. Except for a 
few random trade wind showers, minimal convective activity is 
occurring across the basin.


A broad mid to upper-level high covering the Caribbean and very 
dry air aloft will support stable conditions across the island 


A deep layer trough in the central Atlantic is supporting a cold 
front that extends from 31N43W to 22N64W. The front dissipates 
west of 22N64W to the SE Bahamas. Scattered moderate showers are 
along the frontal boundary north of 23N. Strong high pressure 
building west of the front will prevail over the area through 
mid-week. The Azores high extends a surface ridge and fair 
weather across the eastern Atlantic, with the ridge axis from 
32N28W to 24N44W.

For additional information please visit 


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Page last modified: Monday, 18-Dec-2017 11:30:37 UTC