000
AXNT20 KNHC 131736
TWDAT 

TROPICAL WEATHER DISCUSSION  
NWS NATIONAL HURRICANE CENTER MIAMI FL 
205 PM EDT SAT APR 13 2013

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...WEATHER OBSERVATIONS...RADAR...AND METEOROLOGICAL 
ANALYSIS.

BASED ON 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1715 UTC.

...ITCZ/MONSOON TROUGH... 

THE MONSOON TROUGH EXTENDS FROM S GUINEA NEAR 9N13W TO 2N20W TO  
1S25W. THE ITCZ EXTENDS FROM 1S25W TO 0N35W TO THE COAST OF 
BRAZIL AT 3S44W. SCATTERED MODERATE TO ISOLATED STRONG 
CONVECTION IS S OF THE MONSOON TROUGH FROM 1S-5N BETWEEN 1W-
10W...AND FROM 5N-8N BETWEEN 10W-15W. ISOLATED MODERATE 
CONVECTION IS ALONG THE ITCZ FROM 5S-2N BETWEEN 25W-35W. 
 
...DISCUSSION...

GULF OF MEXICO...                                                

AS OF 1500 UTC...A 1020 MB HIGH IS CENTERED OVER W TENNESSEE 
NEAR 36N90W PRODUCING 15-20 KT EASTERLY WINDS OVER THE N GULF OF 
MEXICO N OF 25N. A COLD FRONT IS OVER CENTRAL FLORIDA FROM 
29N80W TO S OF FORT MYERS AT 26N82W. ISOLATED MODERATE 
CONVECTION IS WITHIN 60 NM OF THE FRONT. A WARM FRONT CONTINUES 
FROM 26N82W TO THE CENTRAL GULF NEAR 24N90W TO THE BAY OF 
CAMPECHE AT 19N95W. SCATTERED MODERATE CONVECTION IS OVER THE 
CENTRAL GULF FROM 24N-26N BETWEEN 87W-91W. IN THE UPPER 
LEVELS... WESTERLY FLOW IS OVER THE W GULF W OF 90W. AN UPPER 
LEVEL TROUGH IS OVER THE E GULF SUPPORTING THE COLD FRONT. UPPER 
LEVEL MOISTURE AND BROKEN HIGH CLOUDS ARE OVER MOST OF THE GULF 
EXCEPT OVER THE YUCATAN PENINSULA AND THE BAY OF CAMPECHE WHERE 
SUBSIDENCE IS NOTED. EXPECT IN 24 HOURS FOR THE WARM FRONT TO 
EXTEND FROM N FLORIDA TO E LOUISIANA TO BROWNSVILLE TEXAS WITH 
CONVECTION.   

CARIBBEAN SEA...                                                 

A 1007 MB LOW IS CENTERED OVER N COLOMBIA NEAR 10N75W. 15-25 KT 
TRADEWINDS ARE OVER THE CARIBBEAN SEA. SCATTERED SHOWERS ARE 
NOTED ALONG THE N COASTS OF VENEZUELA...COLOMBIA...PANAMA AND 
COSTA RICA. MORE SCATTERED SHOWERS ARE OVER THE LEEWARD 
ISLANDS...HISPANIOLA...AND E CUBA. IN THE UPPER LEVELS...AN 
UPPER LEVEL TROUGH IS OVER THE W CARIBBEAN W OF 80W. AN UPPER 
LEVEL RIDGE IS OVER THE E CARIBBEAN WITH AXIS ALONG 74W. STRONG 
SUBSIDENCE IS OVER MOST OF THE AREA. EXPECT LITTLE CHANGE OVER 
THE NEXT 24 HOURS.   

ATLANTIC OCEAN...                                               

AS OF 1500 UTC...A COLD FRONT EXTENDS OVER THE W ATLANTIC FROM 
32N75W TO CENTRAL FLORIDA AT 29N80W. SCATTERED MODERATE 
CONVECTION IS WITHIN 60 NM OF THE FRONT. A 1024 MB HIGH IS OVER 
THE CENTRAL ATLANTIC NEAR 30N55W. ANOTHER 1022 MB HIGH IS OVER 
THE E ATLANTIC NEAR 26N35W. IN THE UPPER LEVELS...A RIDGE TROUGH 
RIDGE PATTERN IS OVER THE ATLANTIC WITH THE TROUGH BETWEEN 40W-
60W. EXPECT OVER THE NEXT 24 HOURS FOR THE W ATLANTIC COLD FRONT 
TO MOVE E...AND FOR ANOTHER COLD FRONT TO DIP INTO THE E 
ATLANTIC WATERS AT 31N30W WITH SHOWERS. 

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

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FORMOSA