Atlantic Tropical Weather Discussion (Text)

AXNT20 KNHC 170603

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
103 AM EST Sun Dec 17 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 0000 UTC surface analysis and satellite imagery through 
0545 UTC.


...Caribbean Sea Gale Warning...

Strong surface pressure centered off the coast of South Carolina
tightens the pressure gradient in the south-central Caribbean,
thus supporting gale-force winds along the northwest portion of the 
Colombian coast. These winds will pulse every night through early
next week as the ridge builds over SW N Atlc waters. Sea heights
will range from 8 to 15 feet in the area of strongest winds. 
Please read the latest NHC High Seas Forecast under AWIPS/WMO 
headers MIAHSFAT2/FZNT02 KNHC for more details. 


The monsoon trough passes through the coast of West Africa near 
09N13W to 08N18W. The ITCZ continues from 08N18W to 06N26W to
01N50W. Scattered showers are from 02N-05N between the Prime
Meridian and 17W and from 07N to 17N between 18W and 35W.



A middle short-wave trough extending from northern Texas SE to a
base over the NW Gulf supports a 1012 mb low off the coast of
Texas near 28N95W. A cold front extends from this low to the SW
basin near 22N96W while a warm front extends NE to E along 30N94W
to 29N92W to 28N88W. At the last coordinate, the front 
transitions to a stationary front continuing SE towards South
Florida. Radar imagery show a line of heavy showers and tstms
between Galveston Texas and SW Louisiana extending S into the Gulf
to near 28N. Scattered to isolated showers are also in the NE
basin associated with the frontal system. Fresh to strong winds
are also in the vicinity of the low due to a tight pressure 
gradient between the low and high pressure over the SE CONUS.
The low will move NE inland dragging the cold front towards
Louisiana and adjacent NW Gulf waters. The front will then
weaken gradually and transition into a surface trough to move
inland Texas early Monday morning.


Gale-force will continue to pulse at night in the south-central
Caribbean as strong high pressure builds in the SW N Atlc waters. Please
refer to the Special Features section above for details. Fair 
weather prevails across the remainder of the basin being supported
by a broad middle to upper level high and very dry air aloft. 
Little change is expected through the next 24-48 hours.


A broad middle to upper level high covering the Caribbean and 
very dry air aloft support very stable conditions across the 
Island. Similar conditions are forecast through Monday. Fresh to 
strong NE to E winds will continue in the Windward Passage through


A broad middle to upper level trough over the NW Atlc supports a
cold front that extends from 30N57W SW to 25N77W to Andros Island.
No convection is associated with this front. Strong high pressure
starts to build west of this front and is forecast to prevail over
SW N Atlc waters through the middle of the week. Otherwise, the
Azores high continue to extend a ridge axis across the eastern
Atlc waters. 

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Page last modified: Sunday, 17-Dec-2017 06:03:44 UTC