000
AXNT20 KNHC 091732
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL  
105 PM EST TUE MAR 09 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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 1715 UTC.

...THE ITCZ...

FROM THE COAST OF LIBERIA NEAR 6N11W TO 4N20W TO 3N30W TO 
1N40W...CROSSING THE EQUATOR ALONG 44W...INTO NORTHEASTERN 
BRAZIL NEAR 2S51W. ISOLATED TO WIDELY SCATTERED MODERATE
SHOWERS AND POSSIBLE THUNDERSTORMS FROM 2N TO 7N BETWEEN 15W
AND 20W...AND FROM 2N TO 5N BETWEEN 24W AND 31W. ISOLATED
MODERATE SHOWERS FROM 2N TO 4N BETWEEN 47W AND 52W. 

...DISCUSSION...

THE GULF OF MEXICO...
A DEEP LAYER TROUGH IS MOVING THROUGH THE CENTRAL U.S.A.
THE TROUGH SUPPORTS A COLD FRONT THAT IS MOVING THROUGH CENTRAL 
TEXAS. THIS FRONT IS FORECAST TO REACH THE TEXAS GULF COAST/
NORTHWESTERN GULF COASTAL WATERS DURING THE NEXT 24 HOURS TO
30 HOURS. A SECOND COLD FRONT IS FORECAST TO FOLLOW THE FIRST 
ONE...AND IT SHOULD OVERTAKE THE FIRST FRONT IN 48 HOURS.
CYCLONIC FLOW ON WATER VAPOR IMAGERY REACHES MEXICO NEAR 25N 
BETWEEN 90W AND 103W. UPPER LEVEL WESTERLY FLOW IS MOVING ACROSS 
THE LOWER RIO GRANDE VALLEY OF TEXAS AND MEXICO FROM THE EASTERN 
PACIFIC OCEAN. SOME OF THIS WESTERLY FLOW REACHES THE YUCATAN 
CHANNEL...AND IT EVENTUALLY PUSHES SOUTHEASTWARD ACROSS CUBA.
LOW TO MIDDLE LEVEL CLOUDS ARE IN THE GULF COASTAL WATERS OF 
LOUISIANA...TEXAS...AND MEXICO TO THE NORTH OF 25N BETWEEN 90W
AND 97W. BROKEN MULTILAYERED CLOUDS COVER THE AREA TO THE NORTH 
OF 23N TO THE EAST OF 90W...AND FROM 22N TO 27N BETWEEN 90W AND 
95W.

THE CARIBBEAN SEA...
LARGE-SCALE UPPER LEVEL NORTHWESTERLY FLOW DURING THE LAST
24 HOURS HAS BEEN PUSHING UPPER LEVEL MOISTURE ACROSS THE AREA...
TO THE NORTHWEST OF THE LINE FROM THE MONA PASSAGE TO 14N76W
TO SOUTHERN NICARAGUA. UPPER LEVEL WESTERLY FLOW IS MOVING 
ACROSS THE LOWER RIO GRANDE VALLEY OF TEXAS AND MEXICO FROM THE
EASTERN PACIFIC OCEAN. SOME OF THIS WESTERLY FLOW REACHES THE 
YUCATAN CHANNEL...AND IT EVENTUALLY PUSHES SOUTHEASTWARD ACROSS 
CUBA. ANOTHER CONTRIBUTING FACTOR TO THE NORTHWESTERLY WIND FLOW 
IS THE UPPER LEVEL TROUGH THAT IS BRINGING CYCLONIC FLOW TO
THE ATLANTIC OCEAN TO THE NORTH OF 20N BETWEEN 45W AND 80W.
A STATIONARY FRONT CONTINUES FROM THE ATLANTIC OCEAN THROUGH 
DOMINICA TO 13N70W AND 13N72W. BROKEN MULTILAYERED CLOUDS ARE 
WITHIN 200 NM TO 300 NM TO THE NORTHWEST OF THE STATIONARY 
FRONT. WEAK MIDDLE LEVEL CYCLONIC FLOW ALSO IS IN THIS AREA
OF COLOMBIA. A QUASI- STATIONARY SURFACE TROUGH IS ALONG 
16N75W...INTO NORTHERN COLOMBIA TO 10N74W AND 6N72W. ISOLATED 
MODERATE SHOWERS ARE IN COLOMBIA FROM 7N TO 8N BETWEEN 73W AND 
76W. WEAK MIDDLE LEVEL CYCLONIC FLOW ALSO IS IN THIS AREA OF 
COLOMBIA.

THE ATLANTIC OCEAN...
AN UPPER LEVEL TROUGH PASSES THROUGH 33N59W TO 28N63W TO 19N67W 
JUST TO THE NORTH OF PUERTO RICO. CYCLONIC FLOW COVERS THE 
ATLANTIC OCEAN TO THE NORTH OF 20N BETWEEN 45W AND 80W. A SURFACE
TROUGH PASSES THROUGH 32N63W TO 30N65W TO 29N69W. A COLD FRONT 
PASSES THROUGH 32N35W TO 29N39W. A STATIONARY FRONT CONTINUES 
FROM 29N39W TO 20N52W TO 16N60W JUST TO THE EAST OF THE 
CARIBBEAN SEA. ISOLATED MODERATE SHOWERS ARE WITHIN 30 NM TO
60 NM ON EITHER SIDE OF 22N48W 21N50W 20N54W 19N57W 18N60W.
BROKEN TO OVERCAST MULTILAYERED CLOUDS ARE WITHIN 60 NM ON 
EITHER SIDE OF 31N36W 27N41W 23N46W.

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

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MT