[Tropical] Tropical Weather Discussion

[EMWIN Server]

AXNT20 KNHC 200557
TWDAT

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
105 AM EST MON DEC 20 2010

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...METEOROLOGICAL ANALYSIS...WEATHER OBSERVATIONS...AND
RADAR.

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 0515 UTC.

...THE ITCZ...

FROM THE GUINEA COAST NEAR 10N14W TO 8N20W 9N36W TO 11N50W.
SCATTERED STRONG RAINSHOWERS AND THUNDERSTORMS ARE FROM 6N TO 8N
BETWEEN 20W AND 27W. SCATTERED MODERATE RAINSHOWERS TO ISOLATED
STRONG THUNDERSTORMS ARE WITHIN 30 NM TO 45 NM ON EITHER SIDE OF
8N31W 4N35W THE EQUATOR AT 39W. RAINSHOWERS ARE POSSIBLE TO THE
SOUTH OF 10N BETWEEN 40W AND 50W. A SURFACE TROUGH IS ALONG
14N51W TO A 1008 MB LOW PRESSURE CENTER THAT IS NEAR 11N53W...
TO 8N52W. STRONG RAINSHOWERS AND THUNDERSTORMS ARE FROM 10N TO
11N BETWEEN 49W AND 51W...AND WITHIN A 30 NM RADIUS OF 11N52W.

...DISCUSSION...

THE GULF OF MEXICO...

UPPER LEVEL NORTHWESTERLY WIND FLOW CONTINUES AFTER THE LATEST
TROUGH HAS MOVED ACROSS THE AREA. A SURFACE RIDGE IS ALONG
25N96W 28N90W...BEYOND SOUTHEASTERN LOUISIANA...MISSISSIPPI...
AND SOUTHWESTERN ALABAMA. A SURFACE TROUGH IS ALONG THE
SOUTHWESTERN GULF COAST OF MEXICO FROM 20N95W TO 23N97W.
MULTILAYERED CLOUDS ARE WITHIN 60 NM ON EITHER SIDE OF 19N94W
21N96W 23N97W. COLD-AIR STRATIFORM CLOUDS REMAIN TO THE SOUTH
OF 28N TO THE EAST OF 88W.

FROM THE ATLANTIC OCEAN TO THE WEST OF 60W INTO THE NORTHWESTERN
CARIBBEAN SEA...AND INTO THE CENTRAL CARIBBEAN SEA...

A LONGWAVE TROUGH ON WATER VAPOR IMAGERY PASSES THROUGH NORTH
CAROLINA TO 32N76W TO 26N74W TOWARD NORTHERN COASTAL HAITI.
THIS TROUGH SUPPORTS THE COLD FRONT THAT PASSES THROUGH 32N68W
TO A 1000 MB LOW PRESSURE CENTER THAT IS NEAR 27N69W. THE COLD
FRONT CONTINUES TO THE TURKS AND CAICOS ISLANDS...AND THEN
DISSIPATING AS IT PASSES THROUGH THE WINDWARD PASSAGE TO THE
CAYMAN ISLANDS. A SURFACE TROUGH EXTENDS FROM THE 1000 MB LOW
PRESSURE CENTER TO 26N66W 20N69W...ACROSS THE DOMINICAN
REPUBLIC...INTO THE CENTRAL CARIBBEAN SEA NEAR 14N71W. BROKEN
TO OVERCAST MULTILAYERED CLOUDS AND ISOLATED MODERATE
RAINSHOWERS AND POSSIBLE THUNDERSTORMS ARE WITHIN 60 NM TO
90 NM ON EITHER SIDE OF THE LINE THAT PASSES THROUGH 32N63W
29N62W 24N65W 20N68W IN THE ATLANTIC OCEAN...AND 20N68W 19N70W
16N70W 13N70W. GALE-FORCE WINDS ARE IN THE ATLANTIC OCEAN WITHIN
180 NM IN THE NORTHEASTERN SEMICIRCLE OF THE LOW CENTER...WITH
SEA HEIGHTS RANGING FROM 8 FEET TO 12 FEET. ISOLATED MODERATE
RAINSHOWERS EVEN ARE IN NORTHWESTERN VENEZUELA AND COASTAL
WATERS.

THE REST OF THE CARIBBEAN SEA...

CLOUDS AND RAINSHOWERS COVER THE WATERS FROM THE ATLANTIC OCEAN
FROM 12N TO 16N BETWEEN 58W AND 67W. A SURFACE-TO-LOW LEVEL
TROUGH IS ALONG 65W FROM 12N TO 16N.

THE REST OF THE ATLANTIC OCEAN...

A LONGWAVE TROUGH ON WATER VAPOR IMAGERY PASSES THROUGH 32N28W
TO 26N31W TO 22N40W. UPPER LEVEL SOUTHWESTERLY WIND FLOW IS TO
THE SOUTH OF 13N46W 21N40W 26N20W BEYOND THE WESTERN SAHARA AND
MAURITANIA. AN OCCLUDED FRONT PASSES THROUGH 32N18W TO 31N18W.
A COLD FRONT CONTINUES FROM 31N18W TO 28N20W AND 23N27W.
A DISSIPATING COLD FRONT GOES FROM 23N27W TO 20N34W.
A DISSIPATING STATIONARY FRONT CONTINUES FROM 20N34W TO 19N49W.
BROKEN LOW LEVEL TO MIDDLE LEVEL CLOUDS AND POSSIBLE RAINSHOWERS
ARE WITHIN 30 NM TO 45 NM ON EITHER SIDE OF THE ENTIRE FRONTAL
BOUNDARY. SURFACE ANTICYCLONIC FLOW MOVES AROUND A 1018 MB HIGH
PRESSURE CENTER THAT IS NEAR 27N52W...FROM 20N TO 30N BETWEEN
40W AND 60W.

FOR ADDITIONAL INFORMATION PLEASE VISIT
HTTP://WWW.HURRICANES.GOV/MARINE

$$

MT





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