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Atlantic Tropical Weather Discussion



000
AXNT20 KNHC 030605
TWDAT 

TROPICAL WEATHER DISCUSSION                                    
NWS NATIONAL HURRICANE CENTER MIAMI FL                         
105 AM EST TUE MAR 03 2015

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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH
0545 UTC.

...SPECIAL FEATURES...

...GALE WARNING FOR THE SW CARIBBEAN... 

A GALE WARNING CONTINUES IN EFFECT FOR COASTAL WATERS OF 
COLOMBIA FROM 11N TO 12.5N BETWEEN 74W AND 77W WITH SEAS RANGING 
BETWEEN 10 AND 14 FT. WINDS WILL DIMINISH BELOW GALE-FORCE 
TUESDAY MORNING...HOWEVER INCREASE AGAIN TO GALE FORCE DURING 
THE NIGHT HOURS PREVAILING THROUGH WEDNESDAY EVENING. PLEASE SEE 
THE LATEST HIGH SEAS FORECAST UNDER AWIPS/WMO HEADERS 
MIAHSFAT2/FZNT02 KNHC FOR MORE DETAILS.

...ITCZ/MONSOON TROUGH...                                      

THE MONSOON TROUGH EXTENDS ACROSS AFRICA INTO THE TROPICAL 
ATLANTIC NEAR 09N13W SW TO 02N18W WHERE THE ITCZ BEGINS AND 
CONTINUES ALONG 02S22W TO 02S30W TO THE COAST OF NORTHERN BRAZIL 
NEAR 03S38W. SCATTERED MODERATE CONVECTION IS FROM 3S TO 01N 
BETWEEN 16W AND 24W...AND FROM 06S TO 02S BETWEEN 26W AND 33W. 

...DISCUSSION...

GULF OF MEXICO...      

EXCEPT FOR THE FAR WESTERN GULF...WEAK SURFACE RIDGING PREVAILS 
ACROSS THE GULF OF MEXICO BEING SUPPORTED BY A MIDDLE TO UPPER 
LEVEL RIDGE. THE SURFACE RIDGE CONTINUES TO PROVIDE E-SE WIND 
FLOW OF 5 TO 15 KT THAT ADVECTS LOW -LEVEL MOISTURE FROM THE SW 
N ATLC WATERS. A WEAK STATIONARY FRONT EXTENDS FROM SOUTHERN 
LOUISIANA SW TO 27N96W TO NE MEXICO NEAR 23N97W. OVER THE SW 
GULF...A SURFACE TROUGH IS ANALYZED FROM 22N96W TO 18N93W. WATER 
VAPOR IMAGERY DRY AIR SUBSIDING ACROSS THE BASIN THAT IS 
HINDERING THE DEVELOPMENT OF CONVECTION. HOWEVER...ADVECTION FOG 
IS BEING REPORTED N OF 23N W OF 90W AND OVER THE NE GULF N OF 
27N E OF 87W...COINCIDING WITH MEDIUM TO HIGH GOES-13 IFR 
PROBABILITIES OF FOG. THE STATIONARY FRONT IS FORECAST TO 
DISSIPATE TUESDAY. SURFACE RIDGING THEN WILL DOMINATE BEFORE THE 
NEXT COLD FRONT ENTER THE NW GULF THURSDAY MORNING.

CARIBBEAN SEA...    

PATCHES OF SHALLOW MOISTURE CONTINUE TO MOVE ACROSS THE 
BASIN...THUS INCREASING THE CHANCES OF PASSING SHOWERS OVER 
PUERTO RICO...HISPANIOLA...LESSER ANTILLES AND HONDURAS COASTAL 
WATERS. HOWEVER...NO DEEP CONVECTION IS EXPECTED AS MIDDLE TO 
UPPER LEVEL DRY AIR CONTINUES TO SUBSIDE ACROSS THE ENTIRE 
REGION. TRADES OF 15 TO 20 KT DOMINATE OVER THE BASIN...EXCEPT 
FOR THE SW CARIBBEAN WHERE WINDS RANGE FROM 25 TO 30 
KT...INCREASING TO GALE FORCE WINDS ALONG THE COAST OF COLOMBIA. 
PLEASE SEE THE SPECIAL FEATURES SECTION ABOVE FOR MORE DETAILS. 
LITTLE CHANGE IS EXPECTED OVER THE NEXT 3 DAYS. 

...HISPANIOLA...                                                 

LOW LEVEL MOISTURE IN THE TRADEWIND FLOW IS SUPPORTING 
CLOUDINESS ACROSS THE ISLAND WITH POSSIBLE ISOLATED SHOWERS. 
MOIST AIR WILL CONTINUE TO FLOW OVER THE ISLAND THROUGH THURSDAY 
MORNING...THUS SUPPORTING SIMILAR WEATHER CONDITIONS. NO DEEP 
CONVECTION IS ANTICIPATED AS MIDDLE TO UPPER LEVEL DRY AIR 
PREVAILS OVER THE ENTIRE CARIBBEAN.

ATLANTIC OCEAN...    

SURFACE AND UPPER RIDGING DOMINATES ACROSS THE BASIN ALONG WITH 
DEEP LAYER DRY AIR...WHICH IS SUPPORTING FAIR WEATHER 
CONDITIONS. THE EXCEPTION TO THIS IS ON THE SW N ATLC WHERE 
LINGERING MOISTURE ASSOCIATED WITH A FORMER FRONT SUPPORT 
ADVECTION FOG WITHIN 60 NM OFF THE NE FLORIDA COAST N OF 
MELBOURNE. A COLD FRONT WILL PUSH S OF 31N AND EXTEND FROM 
31N57W TO 29N70W WITH SHOWERS TUESDAY MORNING.  

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

$$
NR



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Page last modified: Tuesday, 03-Mar-2015 06:06:02 UTC