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Atlantic Tropical Weather Discussion



000
AXNT20 KNHC 231801
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
205 PM EDT WED JUL 22 2014

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.

...SPECIAL FEATURES...                                          

AT 1500 UTC...TROPICAL DEPRESSION TWO WAS LOCATED NEAR 14.0N 
56.0W OR ABOUT 270 NM E OF THE LESSER ANTILLES. THE ESTIMATED 
MINIMUM CENTRAL PRESSURE IS 1012 MB. MAXIMUM SUSTAINED WINDS ARE 
30 KT WITH GUSTS TO 40 KT. THE DEPRESSION WEAKENED SIGNIFICANTLY 
OVERNIGHT AND IS EXPECTED TO DEGENERATE INTO A WAVE OR TROUGH BY 
TONIGHT. SCATTERED MODERATE CONVECTION IS FROM 13N-15N BETWEEN 
52W-56W. SEE THE FINAL NHC ADVISORY UNDER AWIPS/WMO HEADERS 
MIATCPAT2/WTNT32 KNHC FOR MORE DETAILS.

A GALE WARNING CONTINUES IN THE SW CARIBBEAN FOR TIGHT PRESSURE 
GRADIENT ALONG THE COAST OF COLOMBIA FROM 11N-13N BETWEEN 73W-
77W WITH SEAS 10-14 FT. WINDS ARE EXPECTED TO DROP BELOW GALE 
THIS AFTERNOON. SEE THE LATEST ATLANTIC HIGH SEAS FORECAST UNDER 
AWIPS/WMO HEADERS MIAHSFAT2/FZNT02 KNHC FOR MORE DETAILS.

...TROPICAL WAVES...                                     

TROPICAL WAVE IN THE CENTRAL ATLC ALONG 39W WITH AXIS EXTENDING 
FROM 4N-13N MOVING W AT 15-20 KT. WAVE POSITION WAS RELOCATED E 
OF PREVIOUS ANALYSIS BASED ON DEEP LAYER MOISTURE ASSOCIATED 
WITH THE WAVE AS DEPICTED ON SSMI TOTAL PRECIPITABLE WATER VAPOR 
IMAGERY. SCATTERED MODERATE ISOLATED STRONG CONVECTION E OF WAVE 
AXIS FROM 6N-10N BETWEEN 37W-40W. DRY SAHARA AIR LAYER HINDERING 
SIGNIFICANT DEEP CONVECTION N OF 10N. 

TROPICAL WAVE MOVING INTO CENTRAL AMERICA ALONG 89W WITH AXIS 
EXTENDING S OF 21N MOVING W AT 15-20 KT. DRY AIR ASSOCIATED WITH 
SUBSIDENCE ALOFT AND DEEP LAYER SHEAR INHIBITING SIGNIFICANT 
DEEP CONVECTION OVER CENTRAL AMERICA NOT DUE TO DIURNAL HEATING.

...ITCZ/MONSOON TROUGH...                                     

THE MONSOON TROUGH EXTENDS FROM THE AFRICAN COAST NEAR 20N16W TO 
8N31W. THE INTERTROPICAL CONVERGENCE ZONE AXIS EXTENDS FROM 
8N31W TO 4N51W. SCATTERED MODERATE ISOLATED STRONG CONVECTION IS 
WITHIN 30 NM N AND 45 NM S OF THE ITCZ AXIS BETWEEN 40W-48W.

...DISCUSSION...

GULF OF MEXICO...                                               

A WELL DEFINED UPPER LEVEL LOW IS CENTERED NEAR 31N90W WITH A 
1016 MB LOW REFLECTED AT THE SURFACE ALONG A STATIONARY FRONT 
NEAR NEW ORLEANS AT 30N91W. SCATTERED MODERATE CONVECTION IS 
MAINLY SOUTH OF THE STATIONARY FRONT WELL SOUTH OF THE LOW FROM 
27N-30N BETWEEN 89W-96W. LIGHT ANTICYCLONIC SURFACE WINDS ARE 
NOTED IN THE NORTH-CENTRAL GULF...AND LIGHT TO MODERATE EAST-
SOUTHEAST WINDS ARE NOTED ELSEWHERE. GENERALLY FAIR WEATHER IS 
NOTED OVER THE REMAINDER OF THE GULF. LITTLE CHANGE EXPECTED 
NEXT 24 HOURS. 

CARIBBEAN SEA...                                            

15-25 KT TRADE WINDS PREVAIL OVER REMAINDER OF THE BASIN OUTSIDE 
WITH STRONGEST WINDS TO GALE FORCE ACROSS THE CENTRAL CARIBBEAN. 
VERY LITTLE CONVECTION IS EVIDENT IN THE REGION TODAY BUT ACTIVE 
CONVECTION IS EXPECTED TO DEVELOP OVER THE ISLANDS FROM STRONG 
DAYTIME HEATING EFFECTS. AN UPPER LEVEL LOW CENTERED NEAR THE 
CAYMAN ISLANDS IS ENHANCING POTENTIAL FOR WIDESPREAD SHOWERS 
OVER JAMAICA AND CUBA. LITTLE CHANGE EXPECTED ELSEWHERE. 

...HISPANIOLA...                                                

THE UPPER LEVEL LOW NEAR THE CAYMAN ISLANDS IS EXPECTED TO DRIFT 
FURTHER W THROUGH WED. EXPECT NORMAL AMOUNT OF CONVECTION OVER 
HISPANIOLA DURING AFTERNOON AND EVENING HEATING MAXIMUM TODAY 
AND THU WITH FEW SHOWERS OVERNIGHT IN A NEUTRAL MID/UPPER LEVEL 
ENVIRONMENT. 

ATLANTIC OCEAN...                                              

IMPRESSIVE LINE OF SHOWERS AND THUNDERSTORMS HAS DEVELOPED E OF 
CENTRAL FLORIDA NORTHWARD TO SOUTH CAROLINA ALONG GULF STREAM. 
SURFACE OBS INDICATE WEAK SURFACE WIND CONVERGENCE IS ENHANCING 
POTENTIAL FOR WIDESPREAD CONVECTION OVER GULF STREAM. NUMEROUS 
MODERATE ISOLATED STRONG CONVECTION WITHIN 45 NM EITHER SIDE OF 
LINE FROM 27N80W TO 32N78W. A BROAD RIDGE ALONG 30-31N ANCHORED 
BY 1026 MB HIGH CENTERED IN THE CENTRAL ATLANTIC NEAR 32N39W 
PRODUCING MOSTLY FAIR WEATHER ALL ACROSS THE REGION E OF 78W 
WITH NOTABLE EXCEPTION OF SMALL AREAS OF SHOWERS ASSOCIATED WITH 
T.D. TWO  AND TROPICAL WAVE ALONG 39W INTERACTING WITH THE ITCZ 
IN THE DEEP TROPICS. AN UPPER LEVEL LOW CENTERED NEAR 26N63W IS 
SUPPORTING STRONG MID-LEVEL SUBSIDENCE. LARGE UPPER LEVEL RIDGE 
EXTENDING FROM 31N36W TO 29N48W TO 17N58W IS SUPPORTING MODERATE 
UPPER LEVEL SUBSIDENCE. LITTLE CHANGE EXPECTED NEXT 24 HOURS. 

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

$$
MUNDELL



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Page last modified: Wednesday, 23-Jul-2014 18:01:24 UTC