000
AXNT20 KNHC 052347
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL  
805 PM EDT MON APR 05 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 6N8W 3N16W 1N36W ALONG THE 
EQUATOR FROM 42W TO INLAND OVER BRAZIL SOUTH AMERICA NEAR 50W. 
CLUSTERS OF SCATTERED MODERATE/ISOLATED STRONG CONVECTION ARE 
FROM 3N-6N E OF 11W TO JUST INLAND OVER LIBERIA AFRICA AND FROM 
6N TO THE EQUATOR BETWEEN 17W-25W. 

...DISCUSSION...

GULF OF MEXICO...
A SURFACE RIDGE COVERS THE GULF WITH THE AXIS EXTENDING FROM A 
1025 MB HIGH IN THE W ATLC ALONG THE N GULF COAST WITH E TO SE 
SURFACE WINDS OVER THE GULF WATERS. AN UPPER RIDGE EXTENDS FROM 
ACROSS S MEXICO/YUCATAN PENINSULA TO OVER THE E US ALONG THE 
GEORGIA/ALABAMA BORDER WITH STRONG SUBSIDENCE AND DRY STABLE AIR 
ALOFT. A BAND OF LOW CLOUDS WITH POSSIBLE ISOLATED SHOWERS ARE 
OVER THE W GULF WITHIN 45/60 NM OF LINE FROM 23N96W TO 28N95W. 
THUS LEAVING THE REMAINDER OF THE GULF WITH CLEAR SKIES THIS 
EVENING. A STRONG COLD FRONT IS EXPECTED TO MOVE OFF THE TEXAS 
COAST LATE WED.  

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 AXIS OVER THE GULF OF MEXICO IS GIVING THE NW CARIBBEAN NW 
FLOW ALOFT AND A SECOND RIDGE AXIS OVER THE TROPICAL ATLC 
COUPLES TO INDUCE A INVERTED TROUGH EXTENDING FROM E CUBA 
ACROSS JAMAICA TO 15N81W. MODERATE TO STRONG SUBSIDENCE AND DRY 
STABLE AIR ALOFT COVERS MOST OF THE BASIN. AN ABUNDANCE OF LOW 
LEVEL MOISTURE COVERS THE CARIBBEAN S OF 16N GENERATING BROKEN 
TO OVERCAST LOW CLOUDS WITH POSSIBLE SCATTERED SHOWERS. 

ATLANTIC OCEAN...
A SURFACE RIDGE COVERS THE W ATLC W OF 60W INTO THE GULF OF 
MEXICO ANCHORED BY A 1025 MB HIGH NEAR 31N76W PRODUCING STRONG 
SUBSIDENCE ALOFT AND GIVING THE AREA FAIR WEATHER THIS EVENING. 
A DEEP LAYERED TROUGH IS OVER THE CENTRAL ATLC WITH THE UPPER 
LOW NEAR 31N48W AND SUPPORTING A 1005 MB SURFACE LOW NEAR 
32N48W. A SURFACE TROUGH EXTENDS FROM THE LOW INTO THE REGION 
ALONG 32N45W 28N45W TO 24N49W. ISOLATED SHOWERS ARE N OF 29N 
BETWEEN 42W-48W. THIS UPPER TROUGH IS ALSO SUPPORTING A COLD 
FRONT THAT ENTERS THE REGION NEAR 32N37W EXTENDING SW TO 21N48W 
DISSIPATING TO JUST E OF THE LESSER ANTILLES NEAR 15N59W. 
SCATTERED SHOWERS AND POSSIBLE ISOLATED THUNDERSTORMS ARE WITHIN 
150 NM E OF THE FRONT N OF 22N. A WEAK SURFACE RIDGE COVERS THE 
E ATLC EXTENDING FROM A 1021 MB HIGH BETWEEN THE MADEIRA ISLANDS 
AND THE AZORES THROUGH 32N23W TO 22N33W GIVING THE E ATLC FAIR 
WEATHER THIS EVENING. 

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

$$
WALLACE