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Atlantic Tropical Weather Discussion



000
AXNT20 KNHC 040556
TWDAT 

TROPICAL WEATHER DISCUSSION 
NWS NATIONAL HURRICANE CENTER MIAMI FL 
205 AM EDT TUE AUG 04 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 
0515 UTC.

...SPECIAL FEATURES...

GALE FORCE WINDS ARE FORECAST STARTING AT 0600 UTC THIS MORNING 
AND CONTINUING UNTIL 1800 UTC FROM 11N TO 13N BETWEEN 74W AND 
77W. THESE WINDS ARE ASSOCIATED WITH THE TIGHT PRESSURE GRADIENT 
BETWEEN THE W ATLANTIC SURFACE RIDGE AND THE 1004 MB LOW 
CENTERED OVER N COLOMBIA. PLEASE SEE THE HIGH SEAS FORECAST 
UNDER AWIPS/WMO HEADERS MIAHSFAT2/FZNT02 KNHC FOR MORE DETAILS.  

...TROPICAL WAVES...                                          

A TROPICAL WAVE IS OVER THE EASTERN ATLANTIC WITH AN AXIS 
EXTENDING FROM 19N34W TO 10N35W MOVING W AT AROUND 10 KT OVER 
THE PAST 24 HOURS. MODEL GUIDANCE SHOWS BROAD 700 MB TROUGHING 
FROM 31W TO 38W. SSMI TPW SHOWS THE WAVE A THE LEADING EDGE OF A 
POLEWARD SURGE IN TROPICAL MOISTURE. NO DEEP CONVECTION IS 
ASSOCIATED WITH THIS WAVE. 

A TROPICAL WAVE IS OVER THE CENTRAL ATLANTIC WITH AXIS EXTENDING 
FROM 20N46W TO 10N45W...MOVING W AT 10 TO 15 KT. THIS WAVE 
COINCIDES WITH BROAD 700 MB TROUGHING BETWEEN 40W AND 48W. SSMI 
TPW IMAGERY SHOWS A DRY ENVIRONMENT SURROUNDING THIS WAVE N OF 
13N ALONG WITH SAHARAN DUST. A MOIST ENVIRONMENT IS INDICATED S 
OF 13N. ISOLATED MODERATE CONVECTION IS FROM 07N TO 12N BETWEEN 
44W AND 48W. 

A TROPICAL WAVE IS OVER THE CENTRAL CARIBBEAN WITH AN AXIS 
EXTENDING FROM THE WINDWARD PASSAGE AT 20N75W TO N COLOMBIA AT  
10N76W MOVING W AT 15 KT OVER THE PAST 24 HOURS. THIS WAVE 
COINCIDES WITH 700 MB TROUGHING BETWEEN 74W AND 80W. NO DEEP 
CONVECTION IS ASSOCIATED WITH THIS WAVE. 

...ITCZ/MONSOON TROUGH... 

THE MONSOON TROUGH AXIS EXTENDS ACROSS AFRICA TO THE E TROPICAL 
ATLANTIC NEAR 12N16W TO 11N34W AND RESUMES W OF A TROPICAL WAVE 
NEAR 12N38W TO 10N44W. THE ITCZ EXTENDS W OF A TROPICAL WAVE 
NEAR 10N48W TO S AMERICA NEAR 10N62W. CLUSTERS OF MODERATE TO 
STRONG CONVECTION ARE FROM 06N TO 14N BETWEEN 13W AND 
20W...WHICH MAY ALSO BE ASSOCIATED WITH A TROPICAL WAVE ABOUT TO 
EMERGE OFF THE AFRICAN COAST. ISOLATED MODERATE CONVECTION IS 
ELSEWHERE WITHIN 200 NM OF THE MONSOON TROUGH E OF 44W. 

...DISCUSSION...

GULF OF MEXICO...  

AN UPPER RIDGE EXTENDS FROM TX TO THE NW GULF WITH AN AXIS THAT 
EXTENDS E ACROSS N FL. THE UPPER LEVEL DIFFLUENCE ASSOCIATED 
WITH THE UPPER RIDGE AXIS AND MODERATE MOISTURE SUPPORTS ISOLATED 
MODERATE CONVECTION FROM 26N TO 29N BETWEEN 82W AND 92W. AN 
UPPER TROUGH EXTENDS NE FROM THE NW CARIBBEAN TO CENTRAL CUBA 
AND SUPPORTS ISOLATED THUNDERSTORMS OVER THE FL STRAITS. AT THE 
SURFACE...A SURFACE RIDGE OVER THE W ATLC EXTENDS AN AXIS ACROSS 
S FL AND THE CENTRAL GULF. SE WINDS AROUND 10 KT COVER THE S 
GULF. S TO SW WINDS AROUND 10 KT COVER THE N GULF. A SURFACE 
TROUGH OVER THE SOUTHERN US WILL MOVE OVER THE NORTHERN GULF 
COAST TODAY...ENHANCING CONVECTION OVER THAT PORTION OF THE GULF 
BASIN. 

CARIBBEAN SEA... 

A DEVELOPING GALE IS OVER THE COAST OF N COLOMBIA. PLEASE SEE 
THE SPECIAL FEATURES SECTION FOR MORE DETAILS. STRONG TRADE 
WINDS ARE OVER THE REMAINDER OF THE S CENTRAL CARIBBEAN. 
MODERATE TO FRESH TRADE WINDS ARE ELSEWHERE OVER THE CARIBBEAN. 
A TROPICAL WAVE IS OVER THE CENTRAL CARIBBEAN. PLEASE SEE THE 
TROPICAL WAVES SECTION FOR MORE DETAILS. AN UPPER TROUGH THAT 
EXTENDS ACROSS THE NW CARIBBEAN IS INTERACTING WITH A MODERATELY 
MOIST AIRMASS TO SUPPORTS ISOLATED MODERATE CONVECTION FROM 18N 
TO 23N BETWEEN 77W AND 87W. THE REMAINDER OF THE CARIBBEAN IS 
FREE OF DEEP CONVECTION THIS MORNING. CONVECTION WILL CONTINUE 
OVER THE NW CARIBBEAN TODAY.

...HISPANIOLA... 

DRY AIR AT THE MID TO UPPER LEVELS IS SPREADING ACROSS THE 
ISLAND THIS MORNING AS A TROPICAL WAVE AND UPPER TROUGH W OF THE 
AREA CONTINUES TO MOVE FARTHER FROM HISPANIOLA. PRECIPITATION 
TODAY WILL BE FROM WEAK SHOWERS IN THE TRADE WIND FLOW OVER THE 
EASTERN DOMINICAN REPUBLIC...AND ISOLATED THUNDERSTORMS OVER THE 
ISLAND DUE TO TERRAIN IN THE AFTERNOON. 

ATLANTIC OCEAN... 

AN UPPER RIDGE AXIS EXTENDS ACROSS N FL AND OVER THE W ATLC TO 
77W. UPPER LEVEL DIFFLUENCE UNDER THE RIDGE AXIS COMBINED WITH 
CONVERGENCE FROM A LOW OVER THE ATLC COAST OF GA SUPPORTS 
ISOLATED MODERATE CONVECTION FROM 29 TO 31N BETWEEN 79W AND 81. 
AN UPPER TROUGH EXTENDS FROM THE NW CARIBBEAN TO THE CENTRAL 
BAHAMAS. MODEL GUIDANCE AND SATELLITE IMAGERY ALSO CONFIRM THE 
PRESENCE OF AN INVERTED MID LEVEL TROUGH FROM 73W TO 80W. THESE 
FEATURES ARE SUPPORTING SCATTERED THUNDERSTORMS AND ISOLATED 
MODERATE CONVECTION FROM CUBA TO 26N BETWEEN 72W AND 
80W...INCLUDING THE CENTRAL BAHAMAS. A SURFACE TROUGH IS OVER 
THE W ATLC FROM 30N69W TO 27N68W SUPPORTING ISOLATED MODERATE 
CONVECTION WITHIN 100 NM OF THE TROUGH AXIS. SURFACE RIDGING 
ANCHORED BY A 1028 MB HIGH CENTERED NEAR 34N55W DOMINATES THE 
CENTRAL AND EASTERN SUBTROPICAL ATLC. TWO TROPICAL WAVES ARE 
OVER THE TROPICAL ATLC. PLEASE REFER TO THE TROPICAL WAVES 
SECTION FOR MORE DETAILS. CONVECTION IS EXPECTED TO CONTINUE 
THROUGH TODAY FROM THE CENTRAL BAHAMAS NORTHWARD TO 31N W OF 75W.

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

$$ 
LATTO


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Page last modified: Tuesday, 04-Aug-2015 05:56:52 UTC