AXNT20 KNHC 140001 
Tropical Weather Discussion 
NWS National Hurricane Center Miami FL 
801 PM 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 1800 UTC surface analysis and satellite imagery through 
2300 UTC. 
The monsoon trough extends from the African coast near 07N11W to 
05N14W. The ITCZ continues from 05N14W to 00N33W to the coast of 
Brazil near 03S40W. Scattered moderate convection is seen from 03N 
to 04N between 17W to 23W. 
A cold front has exited to the SE of the basin. Residual troughing 
over the SW Bay of Campeche is maintaining an area of cloudiness 
over the SW Gulf S of 28N and W of 90W. High pressure will build 
SE from the central plains of the United States to the NE Gulf by 
Fri. Moderate to fresh NE winds will gradually veer to SE as the 
high pressure migrates to the NE Gulf. 
A cold front extends from eastern Cuba near 20N78W to Belize near 
18N88W. The front will slow down and reach from eastern Cuba to 
the Gulf of Honduras tonight, then stall from Hispaniola to 
Nicaragua on Wed, 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 are 
observed N of the cold front as well as the waters S of 18N and 
east of 80W. Deep layer low pres will linger near the NE United 
states during the next few days. This will weaken the ridge N of 
the Caribbean and cap winds along the coast of Colombia to 
between 20 and 25 kt during the next few days. 
A cold front extends across the west Atlantic from 32N60W to 
25N68W to eastern Cuba near 21N75W. The gale force winds that 
previously accompanied the front N of 28N have lifted to the N of 
31N as the parent low centered near New England lifts farther N. 
Scattered showers and isolated thunderstorms are present along and 
up to 60 nm NW of the front N of 28N. Otherwise, a broad area of 
high pressure prevails across the central and eastern Atlantic, 
anchored by a 1024 mb high centered near 27N38W. 
The convection associated with the front will shift eastward and 
diminish tonight as the front continues pushing east. The front is 
slowing down and will stall from 32N56W to 26N65W to E Cuba 
tonight. A reinforcing shot of cold air pushing E from the Mid 
Atlc States will cause the northern part of the front to begin 
moving east again by Wednesday night. 
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