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Atlantic Tropical Weather Discussion (Text)



000
AXNT20 KNHC 281743
TWDAT 

TROPICAL WEATHER DISCUSSION                                    
NWS NATIONAL HURRICANE CENTER MIAMI FL                         
205 PM EDT THU MAY 28 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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1715 UTC.

...TROPICAL WAVES...

A TROPICAL WAVE IS W OF THE ITCZ FROM 06N TO 15N WITH AXIS NEAR 
56W/57W...MOVING W AT 15-20 KT DURING THE LAST 24 HOURS. SSMI 
TPW IMAGERY SHOWS THAT THE WAVE CONTINUES TO BE EMBEDDED WITHIN 
ABUNDANT MOISTURE IN THE MIDDLE TO LOWER LEVELS. SATELLITE 
DERIVED WINDS AND MODEL GUIDANCE SHOW A DIVERGENT ENVIRONMENT 
ALOFT THAT SUPPORTS SCATTERED MODERATE CONVECTION FROM 09N TO 
16N BETWEEN 55W AND 61W.

...ITCZ/MONSOON TROUGH...

THE MONSOON TROUGH EXTENDS ACROSS AFRICA REACHING THE TROPICAL 
ATLANTIC NEAR 10N14W TO 05N23W...WHERE THE ITCZ BEGINS AND 
CONTINUES THROUGH 04N35W TO THE COAST OF SOUTH AMERICA NEAR 
02N50W. SCATTERED MODERATE/ISOLATED STRONG CONVECTION IS FROM 
02N TO 07N BETWEEN 10W AND 22W. SCATTERED MODERATE CONVECTION IS 
ALSO FROM 02N TO 06N BETWEEN 24W AND 53W. 

...DISCUSSION...

GULF OF MEXICO...

A WEAK UPPER TROUGH IS CENTERED OVER THE EASTERN GULF OF MEXICO 
WITH ANOTHER MIDDLE TO UPPER LEVEL TROUGH ACROSS NORTHERN TEXAS. 
UPPER LEVEL DIFFLUENT FLOW BETWEEN THESE TWO TROUGHS SUPPORTS 
SCATTERED THUNDERSTORMS FROM 27N TO 31N BETWEEN 85W AND 89W. A 
WEAK SURFACE TROUGH EXTENDS FROM 23N93W TO 18N94W. NO CONVECTION 
IS NOTED WITH THIS TROUGH. EAST TO SOUTHEAST SURFACE WINDS OF 10 
TO 15 KT DOMINATE THE BASIN THIS AFTERNOON. AN EASTWARD MOVING 
DISTURBANCE OVER TEXAS MAY BRING CONVECTION ACROSS THE EXTREME 
NORTHWESTERN GULF BY FRIDAY AFTERNOON. ELSEWHERE...GENERALLY 
FAIR WEATHER IS EXPECTED TONIGHT THROUGH FRIDAY. 

CARIBBEAN SEA... 

THE UPPER TROUGH OVER THE EASTERN GULF HAS AN AXIS THAT EXTENDS 
SOUTHWARD OVER THE NORTHWESTERN CARIBBEAN. FORCING AROUND THE 
BASE OF THE TROUGH SUPPORTS SCATTERED MODERATE CONVECTION FROM 
18N TO 22N BETWEEN 76W AND 86W. A 1009 MB LOW OVER COLOMBIA 
SUPPORTS CLUSTERS OF MODERATE TO STRONG CONVECTION OVER THE 
SOUTHWESTERN CARIBBEAN S OF 12N BETWEEN 75W AND 80W. INCREASING 
MOISTURE IN ADVANCE OF A WESTWARD MOVING TROPICAL WAVE OVER THE 
CENTRAL ATLC IS SUPPORTING WIDELY SCATTERED MODERATE CONVECTION 
FROM 10N TO 16N BETWEEN THE WINDWARD ISLANDS AND 63W. TRADE 
WINDS OF 10 TO 20 KT DOMINATE THE CARIBBEAN WITH AN AREA OF 25 
KT WINDS JUST OFFSHORE OF COLOMBIA OVER THE CENTRAL CARIBBEAN. 
OVER THE NEXT 24 HOURS EXPECT CONVECTION TO CONTINUE OVER THE 
SOUTHWESTERN CARIBBEAN. ADDITIONAL CONVECTION WILL SPREAD ACROSS 
THE EASTERN CARIBBEAN OVER THE NEXT 24 HOURS ASSOCIATED WITH THE 
WESTWARD MOVING TROPICAL WAVE.

...HISPANIOLA...

MIDDLE TO UPPER LEVEL TROUGHING COMBINED WITH ABUNDANT LOW LEVEL 
MOISTURE SUPPORTS SHOWERS AND ISOLATED THUNDERSTORMS OVER THE 
ISLAND TODAY. THUNDERSTORMS WILL WEAKEN DURING THE EVENING WITH 
ADDITIONAL DEVELOPMENT EXPECTED AGAIN DURING THE DAY FRIDAY. 

ATLANTIC OCEAN...

A MIDDLE TO UPPER LEVEL LOW CENTERED NEAR 27N63W SUPPORTS A 
COUPLE OF LOW LEVEL CENTERS WITH TROUGHING. THE WESTERNMOST LOW 
OF 1015 MB IS CENTERED NEAR 26N67 WITH A TROUGH AXIS EXTENDING 
FROM 30N64W...THROUGH THE LOW...TO 24N67W. THE EASTERNMOST LOW 
OF 1016 MB IS CENTERED NEAR 25N60W WITH A SURFACE TROUGH 
EXTENDING TO 25N63W. THIS SECOND LOW IS DEPICTED WELL IN THIS 
MORNINGS SCATTEROMETER DATA. SCATTERED MODERATE CONVECTION IS 
FROM 23N TO 31N BETWEEN 54W AND 65W. HIGH PRESSURE CENTERED 
NORTHWEST OF THE AZORES SUPPORTS GENERALLY FAIR WEATHER OVER THE 
EASTERN SUBTROPICAL ATLC. OVER THE NEXT 24 HOURS EXPECT A BROAD 
AREA OF CONVECTION TO CONTINUE IN THE VICINITY OF THE UPPER LOW 
AS IT REMAINS NEARLY STATIONARY OVERNIGHT AND BEGINS TO DRIFT 
NORTH ON FRIDAY. 

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

$$
LATTO

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Page last modified: Thursday, 28-May-2015 17:43:24 UTC