000
AXNT20 KNHC 011039
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL  
805 AM EDT THU APR 01 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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1015 UTC...

...ITCZ...

ITCZ AXIS IS CENTERED ALONG 7N8W 3N14W 3N38W CROSSING THE 
EQUATOR TO INLAND OVER SOUTH AMERICA NEAR 50W. CLUSTERS OF 
SCATTERED MODERATE/ISOLATED STRONG CONVECTION ARE FROM THE 
EQUATOR TO 6N BETWEEN 6W-38W. 

...DISCUSSION...

GULF OF MEXICO...
A SURFACE RIDGE CONTINUES TO DOMINATE THE GULF ANCHORED BY A 
1022 MB HIGH NEAR 27N84W. AN UPPER LEVEL SHEAR AXIS EXTENDS FROM 
THE W ATLC ACROSS THE FLORIDA KEYS TO 24N93W. STRONG SUBSIDENCE 
AND VERY DRY STABLE AIR ALOFT COVER ALL THE GULF WITH A LARGE 
UPPER RIDGE COVERING THE SE US ANCHORED OVER N ALABAMA. RETURN 
FLOW IS BRINGING BROKEN/OVERCAST LOW CLOUDS N OF 26N W OF 91W TO 
OVER LOUISIANA AND TEXAS. MOSTLY CLEAR SKIES REMAIN ACROSS THE 
REMAINDER OF THE GULF AGAIN THIS MORNING. THE NEXT FRONT IS 
EXPECTED TO ENTER THE NW GULF FRI NIGHT/EARLY SAT. 

CARIBBEAN SEA...
BROAD UPPER RIDGE COVERS THE CARIBBEAN WITH MODERATE/STRONG 
SUBSIDENCE AND DRY STABLE AIR. FRESH TO STRONG TRADE WINDS ARE 
OVER THE CARIBBEAN WITH THE STRONGEST WINDS ALONG THE N COAST OF 
COLOMBIA. SCATTERED SHOWERS AND POSSIBLE ISOLATED THUNDERSTORMS 
ARE OVER THE SW CARIBBEAN S OF 13N W OF 74W TO INLAND CENTRAL 
AMERICA AND COLOMBIA WITH SCATTERED SHOWERS REMAINING OVER HAITI 
AND THE IMMEDIATE COASTAL WATERS WHILE THE REMAINDER OF THE 
CARIBBEAN HAS MOSTLY CLEAR SKIES THIS MORNING. THE FIRST 
SATELLITE IMAGES SHOW A LAYER OF DRY SAHARAN AIR AND DUST 
COVERING THE TROPICAL ATLC S OF 20N INTO THE E CARIBBEAN. 

ATLANTIC OCEAN...
THE SURFACE RIDGE OVER THE GULF OF MEXICO EXTENDS ACROSS THE 
FLORIDA PENINSULA INTO THE W ATLC TO 70W INCLUDING THE BAHAMA 
ISLANDS ANCHORED IN THE GULF OF MEXICO. A STATIONARY FRONT 
ENTERS THE REGION E OF BERMUDA NEAR 32N58W EXTENDING ALONG 
25N63W JUST E OF THE TURKS AND CAICOS TO THE NW COAST OF HAITI 
NEAR 20N73W. THE UPPER TROUGH SUPPORTING THIS FRONT IS N OF 25N 
WITH THE UPPER LEVEL LOW WELL N OF BERMUDA. THE UPPER RIDGE OVER 
THE CARIBBEAN EXTENDS A RIDGE AXIS N ACROSS TRINIDAD ALONG 
25N53W TO BEYOND 32N51W PROVIDING DIFFLUENCE ALOFT TO CONTINUE 
TO GENERATE SCATTERED SHOWERS AND POSSIBLE ISOLATED 
THUNDERSTORMS N OF 26N BETWEEN 50W AND THE FRONT. A WEAK 1017 MB 
HIGH IS TO THE E OF THE FRONT NEAR 25N55W. A 1010 MB LOW IS IN 
THE E/CENTRAL ATLC NEAR 27N38W AND A SURFACE TROUGH EXTENDING 
FROM THE LOW ALONG 28N32W ALONG 22N36W TO 19N48W. SCATTERED 
SHOWERS AND POSSIBLE ISOLATED THUNDERSTORMS ARE FROM 25N-31N 
BETWEEN 29W-37W. THE UPPER LEVEL SUPPORT FOR THIS FRONT IS N OF 
21N BETWEEN 25W-45W WITH THE UPPER LEVEL LOW NEAR 28N38W. A 
SURFACE RIDGE COVERS THE E ATLC N OF 23N E OF 30W ANCHORED BY A 
1027 MB HIGH OVER THE AZORES. THE FIRST SATELLITE IMAGES SHOW A 
LAYER OF DRY SAHARAN AIR AND DUST COVERING THE TROPICAL ATLC S 
OF 20N INTO THE E CARIBBEAN. 
 
FOR ADDITIONAL INFORMATION PLEASE VISIT 
HTTP://WWW.HURRICANES.GOV/MARINE

$$
WALLACE