[Tropical] Tropical Weather Discussion

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AXNT20 KNHC 080554
TWDAT

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
105 AM EST WED DEC 08 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 COASTS OF SIERRA LEONE/LIBERIA NEAR 7N11W TO 4N24W
8N44W...CURVING INTO CENTRAL FRENCH GUIANA. ISOLATED MODERATE
RAINSHOWERS TO LOCALLY STRONG THUNDERSTORMS ARE FROM 3N TO 10N
BETWEEN AFRICA AND 53W. ISOLATED MODERATE RAINSHOWERS ARE FROM
7N TO 12N BETWEEN 50W AND 60W.

...DISCUSSION...

THE GULF OF MEXICO AND THE ATLANTIC OCEAN TO THE WEST OF 60W...

UPPER LEVEL ZONAL FLOW COVERS THE AREA. THE ZONAL FLOW IS ON
THE TAIL END OF A MIDDLE LEVEL TO UPPER LEVEL TROUGH THAT
NOW IS IN THE WESTERN ATLANTIC OCEAN. A MIDDLE LEVEL TO UPPER
CYCLONIC CIRCULATION CENTER IS IN EAST TEXAS. THE TROUGH SUPPORTS
A WESTERN ATLANTIC OCEAN COLD FRONT WHOSE SOUTHERNMOST POINT
REACHES 31N70W...A STATIONARY FRONT THAT PASSES THROUGH 32N56W
TO 23N69W...AND A REMNANT CLOUD LINE THAT IS ABOUT 120 NM TO
150 NM TO THE EAST OF THE STATIONARY FRONT. A SURFACE RIDGE
PASSES THROUGH SOUTHERN ALABAMA AND THE FLORIDA PANHANDLE BEYOND
THE YUCATAN CHANNEL. A STATIONARY FRONT DANGLES ALONG THE
MEXICO/TEXAS COAST...FROM THE ISTHMUS OF TEHUANTEPEC TO THE
LOWER RIO GRANDE VALLEY OF TEXAS. BROKEN LOW LEVEL TO MIDDLE
LEVEL CLOUDS ARE TO THE NORTH 24N BETWEEN 92W AND THE MEXICO/
TEXAS COASTS.

THE CARIBBEAN SEA...

UPPER LEVEL SOUTHWESTERLY WIND FLOW COVERS THE AREA THAT IS TO
THE EAST OF THE LINE THAT GOES FROM EAST CENTRAL NICARAGUA
BEYOND HISPANIOLA. UPPER LEVEL WESTERLY FLOW MOVES ACROSS THE
NORTHWESTERN CORNER OF THE AREA. A 1009 MB LOW PRESSURE CENTER
IS NEAR 10N77W IN THE SOUTHWESTERN CORNER OF THE AREA. A REMNANT
CLOUD LINE EXTENDS FROM THE 1009 MB LOW CENTER TO THE NORTH
CENTRAL CARIBBEAN SEA WATERS...THEN TO A SPOT THAT IS ABOUT 50 NM
TO THE SOUTH OF PUERTO RICO. RAINSHOWERS ARE FROM 16N TO BETWEEN
63W AND 68W. STRONG RAINSHOWERS AND THUNDERSTORMS ARE IN
NORTHERN COLOMBIA FROM 8.5N TO 10N BETWEEN 72W AND 75W. OTHER
RAINSHOWERS AND THUNDERSTORMS ARE TO THE SOUTH OF 10N BETWEEN
77W AND 80W.

THE REST OF THE ATLANTIC OCEAN...

MIDDLE LEVEL TO UPPER LEVEL CYCLONIC FLOW MOVES AROUND A TROUGH
THAT PASSES THROUGH 32N26W TO 22N29W TO 12N34W. THE CYCLONIC
FLOW COVERS THE ATLANTIC OCEAN TO THE NORTH OF 12N TO THE EAST
OF 45W. A SURFACE TROUGH EXTENDS FROM A 1002 MB LOW PRESSURE
CENTER NEAR 34N18W TO 30N23W TO 29N28W. BROAD SURFACE CYCLONIC
FLOW COVERS THE AREA TO THE NORTH OF 18N TO THE EAST OF 37W.
SURFACE ANTICYCLONIC FLOW MOVES AROUND A RIDGE THAT PASSES
THROUGH 33N42W 25N49W 19N55W.

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

$$
MT





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