000
AXNT20 KNHC 071045
TWDAT 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
805 AM EDT TUE APR 07 2009

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.

...THE ITCZ...
ITCZ AXIS IS CENTERED ALONG 5N9W 2N20W CROSSING THE EQUATOR 
NEAR 25W EXTENDING TO NE BRAZIL NEAR 4S39W. SCATTERED MODERATE 
CONVECTION IS WITHIN 60 NM OF THE AXIS E OF 12W AND S OF 2N 
BETWEEN 20W-25W.  

...DISCUSSION...

THE GULF OF MEXICO...
A STRONG COLD FRONT HAS NEARLY CROSSED THE ENTIRE AREA EXTENDING 
FROM EXTREME SOUTH FLORIDA TO THE NE YUCATAN PENINSULA. LOW-MID 
LEVEL CLOUDINESS AND ISOLATED SHOWERS ARE WITHIN 90 NM OF THE 
FRONT. W OF THE FRONT...N TO NW 20-30 KT WINDS COVER THE 
MAJORITY OF THE AREA...STRONGEST OVER THE SW WATERS WHERE LOCAL 
TOPOGRAPHY PROVIDES AN ENHANCEMENT. THESE WINDS ARE PRODUCING 
COMBINED SEAS UP TO 13 FT...HIGHEST OVER THE SRN WATERS DUE TO 
THE LONGER FETCH. HIGH PRES WILL BUILD FROM W TO E OVER THE N 
GULF WATERS TODAY AND WED...WHICH WILL ALLOW WINDS TO QUICKLY 
DIMINISH AND MODIFY THE RELATIVELY COOL AIRMASS. 

THE CARIBBEAN SEA...
THE SAME FRONT MENTIONED ABOVE IS MOVING INTO THE YUCATAN 
CHANNEL. OVERALL LITTLE EFFECTS ARE OCCURRING OVER THAT AREA AT 
THE MOMENT...BUT N WINDS WILL INCREASE SHORTLY BEHIND THE 
BOUNDARY. THE INCREASE IN WINDS COUPLED WITH N-NW SWELL FROM THE 
GULF OF MEXICO WILL ELEVATE SEAS UP TO 11 FT OVER THE NW 
CARIBBEAN LATER TODAY. ELSEWHERE...THE WEAK LOW-LEVEL TROUGH 
THAT HAS BEEN MOVING W ACROSS THE NE CARIBBEAN DURING THE PAST 
FEW DAYS HAS DISSIPATED OVER HISPANIOLA. FAIR CONDITIONS 
DOMINATE THE REGION ENHANCED BY A STRONGLY SUBSIDENT 
ENVIRONMENT...BETWEEN AN AMPLIFIED UPPER RIDGE OVER THE TROPICAL 
EPAC AND TROUGHING OVER THE CENTRAL ATLC. THE TRADE WIND FLOW IS 
FAIRLY RELAXED DUE TO THE PRESENCE OF THE FRONT N AND W OF THE 
REGION. 20+ KT WINDS ARE CONFINED TO NEAR THE COAST OF 
COLOMBIA.  

THE ATLANTIC OCEAN...
SCATTERED SHOWERS AND TSTMS ARE OCCURRING N OF 28N BETWEEN 70W 
AND 75W ASSOCIATED WITH LOW-LEVEL CONVERGENCE ALONG A STRONG 
COLD FRONT FROM 32N71W TO THE FLORIDA KEYS AND UPPER DIFFLUENCE 
E OF AN UPPER JET. SW WINDS AHEAD OF THE FRONT ARE BLOWING TO 
GALE FORCE WITH WINDS JUST BELOW THAT WITHIN THE COLD SECTOR. 
MULTILAYER CLOUDINESS AND EMBEDDED ISOLATED SHOWERS/TSTMS ARE 
FROM 21N-25N BETWEEN 47W-53W ASSOCIATED WITH INSTABILITY WITHIN 
AN MID-UPPER TROUGH. THE FLOW ALOFT IS MAINLY ZONAL ACROSS THE 
SUBTROPICAL E ATLC SUPPORTING FAIR WEATHER. OVER THE TROPICS...A 
SPRAWLING UPPER HIGH CENTERED NEAR 10N18W IS ENHANCING 
CONVECTION WITHIN THE ITCZ.

$$
CANGIALOSI