000
AXNT20 KNHC 222358
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL  
805 PM EDT THU APR 22 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 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 2315 UTC...

...THE ITCZ...

FROM THE COAST OF SIERRA LEONE NEAR 8N13W TO 2N29W TO 2N40W
TO THE NORTHEASTERN COAST OF BRAZIL NEAR 1N50W. ISOLATED 
MODERATE SHOWERS TO LOCALLY STRONG THUNDERSTORMS ARE WITHIN
250 NM TO THE SOUTH OF 8N54W 3N33W 9N14W. 

...DISCUSSION...

THE GULF OF MEXICO...
UPPER LEVEL CYCLONIC FLOW COVERS A LARGE AREA OF THE U.S.A....
TO THE NORTH OF 30N BETWEEN 100W AND THE CALIFORNIA COAST. 
UPPER LEVEL SOUTHWESTERLY WIND FLOW COVERS MEXICO TO THE
NORTH OF THE LINE THAT PASSES FROM THE SOUTHERN TIP OF BAJA
CALIFORNIA BEYOND 27N100W. COMPARATIVELY DRIER AIR IS TO THE 
NORTHWEST OF THE BAJA-TO-27N100W LINE. UPPER LEVEL MOISTURE 
GALORE MOVES FROM THE EASTERN PACIFIC OCEAN ACROSS THE REST OF 
MEXICO AND IT COMPLETELY COVERS THE GULF OF MEXICO. THE HIGH 
LEVEL MOISTURE ACCOMPANIES UPPER LEVEL ANTICYCLONIC FLOW ACROSS
THE GULF WATERS. THE SURFACE PRESSURE GRADIENT IS COMPARATIVELY
WEAK. THE NEXT COLD FRONT IS FORECAST TO REACH THE TEXAS GULF 
COAST DURING THE NEXT 30 HOURS OR SO. THE FRONT IS FORECAST TO 
SPEND THE NEXT FEW DAYS MOVING ACROSS THE AREA.

THE CARIBBEAN SEA...
UPPER LEVEL SOUTHWESTERLY WIND FLOW COVERS THE ENTIRE AREA.
BROAD SURFACE CYCLONIC FLOW IS IN THE LOW CLOUD FIELD TO THE 
SOUTH OF 18N TO THE EAST OF 82W. SHOWERS ARE POSSIBLE IN 
LINES OF SURFACE CONFLUENT FLOW. THE SURFACE PRESSURE GRADIENT 
IS COMPARATIVELY WEAK RIGHT NOW. MODERATE TO STRONG TRADES WILL 
RETURN TO THE SOUTHERN HALF OF THE TROPICAL NORTH ATLANTIC AND 
THE EASTERN CARIBBEAN SEA LATER TONIGHT INTO FRIDAY...COVERING 
THE WESTERN CARIBBEAN SEA FROM FRIDAY TO MONDAY AS SURFACE HIGH 
PRESSURE BUILDS TO THE NORTH OF THE AREA.

THE ATLANTIC OCEAN...
BROAD MIDDLE LEVEL TO UPPER LEVEL CYCLONIC FLOW WITH A TROUGH 
COVERS THE AREA TO THE WEST OF THE LINE THAT PASSES THROUGH
31N44W TO 20N60W. A COLD FRONT PASSES THROUGH 32N67W TO 28N72W.
SHOWERS ARE POSSIBLE IN CLUSTERS OF LOW LEVEL TO MIDDLE LEVEL 
CLOUDS FROM 25N TO 28N BETWEEN 67W AND 70W...AND TO THE NORTH
OF 27N BETWEEN 57W AND 63W. AN EASTERN ATLANTIC OCEAN COLD FRONT 
PASSES THROUGH 32N31W 27N40W TO 24N48W. A STATIONARY FRONT 
CONTINUES FROM 24N48W TO 27N55W TO A 1011 MB LOW PRESSURE CENTER 
THAT IS NEAR 26N62W. A SURFACE TROUGH CONTINUES FROM THE LOW 
PRESSURE CENTER TO 21N64W. BROKEN TO OVERCAST MULTILAYERED 
CLOUDS AND SHOWERS AND POSSIBLE THUNDERSTORMS ARE WITHIN 180 NM 
ON EITHER SIDE OF 25N56W 29N41W BEYOND 32N35W. BROAD UPPER LEVEL 
ANTICYCLONIC FLOW COVERS THE AREA TO THE EAST OF THE 31N442 
20N60W LINE. SURFACE ANTICYCLONIC FLOW IS WITHIN 420 NM ON 
EITHER SIDE OF A RIDGE THAT PASSES THROUGH 35N12W TO A 1018 MB 
HIGH PRESSURE CENTER THAT IS NEAR 24N29W TO 17N40W TO 17N50W. 

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

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MT