000
AXNT20 KNHC 211113
TWDAT 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
705 AM EST WED DEC 21 2016

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.

...SPECIAL FEATURES...

.None.

...THE ITCZ/THE MONSOON TROUGH...

The Monsoon Trough extends from the coast of Africa at 08N13W to
05N18W. The ITCZ continues from 05N18W to 02N30W to 03N40W to
the coast of South America at 01N50W. Scattered moderate to
isolated strong convection is noted from 00N-05N between 18W-32W.

...DISCUSSION...

...THE GULF OF MEXICO...

As of 0900 UTC, a quasi-stationary front extends from Punta
Gorda Florida at 27N82W to 26N90W to 23N96W to the Bay of
Campeche at 18N93W. The front is mostly void of precipitation.
Over the SW Gulf of Mexico S of 22N and W of front, winds are NW
to N 20-25 kt, with seas to 10 ft. The remainder of the Gulf has
10-20 kt NE winds. Temperatures over the Florida Panhandle are
presently in the 40's, while temperatures over S Florida are in
the 70's. In the upper levels, an upper level high is centered
over central Mexico near 21N101W. Upper level ridging is over
the Gulf of Mexico with strong subsidence. Expect the elevated
platforms in the n-central Gulf to have reduced visibility in
fog and low-level stratus today. Also expect the front to
dissipate over the next 24 hours.  
       
...THE CARIBBEAN SEA...

15-25 kt NE surface flow is over the central and western
Caribbean. Scattered showers are along the coasts of Nicaragua
and Costa Rica. The eastern Caribbean has 15-20 kt tradewinds
with isolated moderate convection E of 70W. In the upper levels,
northern upper level flow is over the central and western
Caribbean with strong subsidence. An upper level low is centered
over Puerto Rico with upper level moisture over the eastern
Caribbean. Expect over the next 24 hours for precipitation to
spread to the central Caribbean.  

...HISPANIOLA...

A sharp transition line between deep moisture and pronounced
drying subsidence is currently orientated n to s along 70W.  The
line will shift w today allowing showers along the east coast to
spread w across the central and western portions of the
Dominican Republic, and possibly reach eastern Haiti this
evening. 

...THE ATLANTIC OCEAN...

A quasi-stationary front extends over the western Atlantic from
31N73W to Stuart Florida at 27N80W. Scattered showers are within
30 nm of the front N of 29N. A surface trough is over the
central Atlantic from 26N53W to 22N55W. Scattered showers are
within 90 nm of the trough. Another surface trough is over the
eastern Atlantic from 31N27W to 27N26W. Scattered showers are
within 90 nm of this trough. A 1035 mb high is centered over the
eastern Atlantic near 38N28W with ridge axis extending WSW to
31N65W. Expect the front to dissipate over the next 24 hours.
  
For additional information please visit
http://www.hurricanes.gov/marine

$$
Formosa