000
AXNT20 KNHC 080005
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL  
805 PM EDT WED APR 07 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 6N9W 3N19W 1N34W CROSSING THE 
EQUATOR AND INTO BRAZIL SOUTH AMERICA NEAR 49W. SMALL CLUSTERS 
OF SCATTERED MODERATE TO ISOLATED STRONG CONVECTION DOT THE AREA 
WITHIN 150 NM OF THE ITCZ W OF 12W.

...DISCUSSION...

GULF OF MEXICO...
A SURFACE RIDGE REMAINS OVER THE E GULF WITH THE AXIS EXTENDING 
FROM A 1023 MB HIGH IN THE W ATLC ALONG THE N GULF COAST TO THE 
ALABAMA/MISSISSIPPI BORDER WITH SE TO S SURFACE WINDS OVER THE 
GULF WATERS. THE UPPER RIDGE HAS SHIFTED EASTWARD AS A DEEP 
LAYERED TROUGH IS DIGGING S OVER TEXAS AND N MEXICO MOVING 
TOWARD THE MISSISSIPPI VALLEY WITH THE ACCOMPANYING COLD FRONT 
REMAINING INLAND OVER TEXAS. THIS FRONT IS EXPECTED TO ENTER THE 
GULF WATERS LATER THIS EVENING. MODERATE/STRONG SUBSIDENCE AND 
DRY STABLE AIR ALOFT ARE ACROSS MUCH OF THE GULF WITH THE 
EXCEPTION OF THE FAR NW. BROKEN/OVERCAST LOW CLOUDS WITH 
POSSIBLE ISOLATED SHOWERS ARE OVER THE NW GULF W OF A LINE FROM 
VERMILION BAY LOUISIANA TO 25N95W...THUS LEAVING THE REMAINDER 
OF THE GULF WITH CLEAR SKIES AGAIN THIS EVENING. 

CARIBBEAN SEA...
THE SURFACE RIDGE OVER THE W/CENTRAL ATLC AND GULF OF MEXICO IS 
GIVING THE CARIBBEAN MODERATE TO STRONG EASTERLY TRADE WINDS. 
NEAR ZONAL WESTERLY FLOW ALOFT COVERS THE ENTIRE CARIBBEAN 
MODERATE TO STRONG SUBSIDENCE AND DRY STABLE AIR ALOFT OVER ALL 
BUT THE SE CARIBBEAN. AN ABUNDANCE OF LOW LEVEL MOISTURE REMAINS 
OVER THE CARIBBEAN GENERATING OVERCAST MULTILAYERED CLOUDS WITH 
SCATTERED SHOWERS S OF A LINE FROM THE LEEWARD ISLANDS NEAR 
17N63W TO 14N72W. THE SURFACE FLOW IS BANKING LOW CLOUDS WITH 
ISOLATED SHOWERS ALONG THE MOUNTAINS OF W PANAMA AND COSTA RICA 
AND WITHIN 60 NM ALONG THE COAST S OF 11N W OF 81W. 

ATLANTIC OCEAN...
A SURFACE RIDGE COVERS THE W AND CENTRAL ATLC W OF 50W INTO THE 
GULF OF MEXICO ANCHORED BY A 1023 MB HIGH NEAR 29N69W PRODUCING 
STRONG SUBSIDENCE ALOFT AND GIVING THE AREA FAIR WEATHER AGAIN 
THIS EVENING. A DEEP LAYERED TROUGH REMAINS OVER THE E/CENTRAL 
ATLC N OF 25N FROM 29W-43W SUPPORTING COLD FRONT THAT ENTERS THE 
REGION NEAR 32N31W EXTENDING ALONG 24N36W TO 19N43W BECOMING 
STATIONARY TO THE ISLAND OF BARBADOS. SCATTERED SHOWERS AND 
POSSIBLE ISOLATED THUNDERSTORMS ARE WITHIN 120 NM E OF THE FRONT 
N OF 25N. AN UPPER RIDGE AXIS EXTENDS TO THE E OF THE UPPER 
TROUGH ACROSS THE TROPICS NEAR 5N33W 20N20W TO 32N12W PROVIDING 
DIFFLUENCE ALOFT TO GENERATE BROKEN/OVERCAST HIGH CLOUDS WITHIN 
300 NM EITHER SIDE OF THE UPPER RIDGE AXIS. 

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

$$
WALLACE