AXNT20 KNHC 131155 
Tropical Weather Discussion 
NWS National Hurricane Center Miami FL 
755 AM EDT Tue Mar 13 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 0600 UTC surface analysis and satellite imagery through 
1130 UTC. 
...Atlantic Ocean Gale Warning... 
A cold front extends across the west Atlantic from 31N67W to the 
central Bahamas near 23N75W to eastern Cuba near 22N78W. Gale- 
force winds are expected overnight north of 28N west of the cold 
front to 76W, and north of 27N within 150 nm east of the front, 
with seas to 14 feet. The conditions will persist another 12 hours 
through this evening. Please read the latest Atlantic Ocean High 
Seas Forecast under AWIPS/WMO headers HSFAT2/FZNT02 KNHC, for more 
The monsoon trough extends from the African coast near 07N11W to 
04N18W. The ITCZ continues from 04N18W to South America near 
03S40W. Isolated showers are south of the monsoon trough and east 
of 14W. 
A cold front exiting the basin extends from eastern Cuba across 
the Yucatan peninsula into the Bay of Campeche. Scattered rain 
showers are noted within 45 nm of the front. Fresh to strong 
northerly winds are across the basin. Strong northerly winds will 
diminish from the northwest during the day. A ridge will extend 
from northeast Texas to the Straits of Florida today, then a high 
pressure will be centered in the northeast Gulf from Thursday 
through the end of the week. 
A cold front extends from eastern Cuba near 22N78W to the Yucatan 
Channel near 19N88W. The front will reach from eastern Cuba to 
the Gulf of Honduras today, stall from Hispaniola to Nicaragua 
tonight, then dissipate by Thursday. High pressure will build 
southeastward from the Gulf of Mexico into the northwest Caribbean 
by the end of the week. Fresh to strong trades continue across 
the waters east of 80W, except for near gale-force winds north of 
the A-B-C islands. 
Gale force winds are N of 28N over the western Atlantic behind a 
cold front that extends from 31N67W to eastern Cuba, and N of 27N 
within 150 nm east of the front. An area of scattered to numerous 
showers and a few thunderstorms is within 200 nm ahead of the 
front. A broad area of high pressure prevails across the central 
and eastern Atlantic, anchored by a 1023 mb high centered near 
27N43W, and another 1023 mb high centered near 28N25W. 
The convection associated with the front will shift eastward and 
diminish today as the front continues pushing east. The front 
will reach from 30N65W to eastern Cuba today, then stall from 
26N65W to E Cuba tonight. High pressure building from the 
northwest will cause the northern part of the front to begin 
moving east again by Wednesday night. 
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