000
AXNT20 KNHC 062357
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL  
805 PM EDT TUE APR 06 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...
THE ITCZ AXIS IS CENTERED ALONG 6N5W 3N11W 2N21W 1N29W 2N42W TO 
INLAND OVER BRAZIL SOUTH AMERICA NEAR 2N50W. SCATTERED MODERATE/ 
ISOLATED STRONG CONVECTION IN THE FORM OF AN OUTFLOW BOUNDARY 
EXTENDS FROM 3N1W 2N6W TO 4N10W. CLUSTERS OF SIMILAR CONVECTION 
ARE FROM 4N-7N E OF 14W TO JUST INLAND OVER LIBERIA AFRICA. 

...DISCUSSION...

GULF OF MEXICO...
A SURFACE RIDGE REMAINS OVER THE GULF WITH THE AXIS EXTENDING 
FROM A 1023 MB HIGH IN THE W ATLC ALONG THE N GULF COAST TO THE 
LOUISIANA/TEXAS BORDER WITH SE TO S SURFACE WINDS OVER THE GULF 
WATERS. AN UPPER RIDGE EXTENDS FROM AN UPPER HIGH NEAR 28N85W TO 
OVER THE E US ALONG THE GEORGIA/ALABAMA BORDER WITH STRONG 
SUBSIDENCE AND DRY STABLE AIR ALOFT ACROSS THE ENTIRE GULF. A 
BAND OF LOW CLOUDS WITH POSSIBLE ISOLATED SHOWERS ARE IN THE W 
GULF WITHIN 45 NM OF LINE FROM 24N96W TO 29N94W...THUS LEAVING 
THE REMAINDER OF THE GULF WITH CLEAR SKIES AGAIN THIS EVENING. A 
STRONG COLD FRONT IS EXPECTED TO MOVE OFF THE TEXAS COAST WED 
EVENING AND MOVE SE OF THE AREA BY FRI NIGHT.  

CARIBBEAN SEA...
THE SURFACE RIDGE OVER THE W ATLC AND GULF OF MEXICO IS GIVING 
THE CARIBBEAN MODERATE TO STRONG EASTERLY TRADE WINDS. THE UPPER 
RIDGE OVER THE GULF OF MEXICO IS GIVING THE NW CARIBBEAN NW FLOW 
ALOFT AND A SECOND RIDGE OVER THE TROPICAL ATLC IS GIVING THE 
REMAINDER OF THE CARIBBEAN SW FLOW ALOFT. MODERATE TO STRONG 
SUBSIDENCE AND DRY STABLE AIR ALOFT COVERS MOST OF THE BASIN. AN 
ABUNDANCE OF LOW LEVEL MOISTURE REMAINS OVER THE CARIBBEAN 
GENERATING PATCHES OF BROKEN TO OVERCAST LOW CLOUDS WITH 
POSSIBLE SCATTERED SHOWERS MAINLY SW OF A LINE FROM HAITI TO 
HONDURAS.  

ATLANTIC OCEAN...
A SURFACE RIDGE COVERS THE W ATLC W OF 55W INTO THE GULF OF 
MEXICO ANCHORED BY A 1023 MB HIGH NEAR 29N72W PRODUCING STRONG 
SUBSIDENCE ALOFT AND GIVING THE AREA FAIR WEATHER AGAIN THIS 
EVENING. A DEEP LAYERED TROUGH REMAINS OVER THE CENTRAL ATLC 
WITH THE UPPER LOW NEAR 31N48W AND SUPPORTING A 1005 MB SURFACE 
LOW NEAR 32N40W. A SURFACE TROUGH EXTENDS FROM A 1005 MB SURFACE 
LOW NEAR 32N42W INTO THE REGION ALONG 29N42W TO 29N47W WITH NO 
SIGNIFICANT SHOWER ACTIVITY. THIS UPPER TROUGH IS ALSO 
SUPPORTING A SECOND SURFACE TROUGH TO THE E ENTERING THE REGION 
NEAR 32N34W EXTENDING SW ALONG 21N43W TO 21N48W TO JUST E OF THE 
LESSER ANTILLES NEAR 14N58W. SCATTERED SHOWERS AND POSSIBLE 
ISOLATED THUNDERSTORMS ARE WITHIN 180 NM E OF THE EASTERN MOST 
SURFACE TROUGH N OF 20N. A WEAK SURFACE RIDGE COVERS THE E ATLC 
EXTENDING FROM A 1021 MB HIGH W OF THE MADEIRA ISLANDS NEAR 
33N20W TO 22N31W GIVING THE E ATLC FAIR WEATHER AGAIN THIS 
EVENING. 

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

$$
WALLACE