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Atlantic Tropical Weather Discussion (Text)

000
AXNT20 KNHC 251748
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
205 AM EDT FRI JUL 25 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 
1500 UTC.

...TROPICAL WAVES...                                     

TROPICAL WAVE IS W OF THE CAPE VERDE ISLANDS WITH AXIS EXTENDING 
FROM 17N25W TO 10N26W MOVING W AT 15 KT. THE WAVE CONTINUES 
EMBEDDED IN THE DRY SAHARAN AIRMASS WHICH IS INHIBITING 
CONVECTION.

TROPICAL WAVE IS EMBEDDED IN THE ITCZ WITH AXIS EXTENDING FROM 
12N53W TO 7N54W MOVING W AT 15-20 KT. DEEP LAYER MOISTURE IN THE 
WAVE ENVIRONMENT IS SUPPORTING SCATTERED MODERATE CONVECTION AND 
ISOLATED TSTMS FROM 7N-11N BETWEEN 50W-60W. 

TROPICAL WAVE IS ON THE CENTRAL CARIBBEAN WITH AXIS EXTENDING 
FROM THE DOMINICAN REPUBLIC NEAR 19N70W TO 13N72W MOVING W 20 
KT. A FEW SHOWERS ARE ALONG THE N PORTION OF THE WAVE.

...ITCZ/MONSOON TROUGH...                                     
MONSOON TROUGH EXTENDS FROM THE COAST OF W AFRICA NEAR 11N15W TO 
9N26W. THE INTERTROPICAL CONVERGENCE ZONE AXIS EXTENDS FROM 
9N26W TO 9N50W TO 8N59W. BESIDES THE CONVECTION MENTIONED 
ASSOCIATED WITH THE TROPICAL WAVES...SCATTERED MODERATE ISOLATED 
CONVECTION WITHIN 180 NM S OF AXIS FROM 15W-18W.

...DISCUSSION...

GULF OF MEXICO...                                               

UPPER LEVEL RIDGE IS ACROSS THE SW GULF S OF 25N W OF 90W. A FEW 
SHOWERS ARE S OF 20N...OTHERWISE FAIR WEATHER PREVAILS ACROSS 
THE WESTERN GULF. A BROAD UPPER LEVEL CYCLONIC CENTERED NEAR 
24N85W DOMINATES THE FLOW OVER THE EASTERN GULF. ISOLATED 
SHOWERS ARE ALONG THE NE GULF. A VERY WEAK SURFACE GRADIENT 
ACROSS THE THE ENTIRE GULF WITH WINDS 10 KT OR LESS. SURFACE 
RIDGING AND FAIR WEATHER IS FORECAST ACROSS MUCH OF THE GULF FOR 
THE NEXT THREE DAYS.  

CARIBBEAN SEA...                                               

A REGION OF UPPER-LEVEL DIFFLUENCE IS OVER THE NW CARIBBEAN 
BASIN WHICH ALONG MODERATE LOW-LEVEL MOISTURE SUPPORT ISOLATED 
SHOWERS AND TSTMS FROM 14N-19N BETWEEN 80W-85W. A TROPICAL WAVE 
IS MOVING OVER THE CENTRAL CARIBBEAN WATERS. SEE TROPICAL WAVE 
SECTION FOR DETAILS. STRONG HIGH PRESSURE OVER THE ATLC BASIN IS 
SUPPORTING A TIGHT SURFACE PRESSURE GRADIENT OVER THE CENTRAL 
CARIBBEAN WITH TRADES OF 20-25 KT S OF HISPANIOLA BETWEEN 69W 
AND 83W. THE TROPICAL WAVE IS FORECAST TO MOVE ACROSS EASTERN 
CUBA AND JAMAICA BY SAT MORNING WHILE A NEW WAVE ENTERS THE 
EASTERN CARIBBEAN.

...HISPANIOLA...                                                

THE DOMINICAN REPUBLIC IS EXPERIENCING ISOLATED SHOWERS AND 
TSTMS AS A TROPICAL WAVE STARTS MOVING ACROSS THE SOUTHERN PART 
OF THE ISLAND. THE WAVE IS FORECAST TO EXIT HAITI BY SATURDAY 
MORNING. SHOWER ACTIVITY IS EXPECTED TO INCREASE THIS LATER THIS 
AFTERNOON/EARLY EVENING WITH DAYTIME HEATING. 

ATLANTIC OCEAN...                                              

AN UPPER LEVEL ANTICYCLONIC CIRCULATION IS CENTERED NEAR 
28N71W...WITH A STATIONARY 1026 MB SURFACE HIGH NEAR 30N54W. 
DOWNSTREAM UPPER LEVEL CYCLONIC CIRCULATION IS CENTERED AT 
28N61W. EXCEPT FOR SCATTERED SHOWERS N OF 26N BETWEEN 63W-68W 
AND ALONG A COLD FRONT FROM 32N30W TO 29N38W THE REMAINDER BASIN 
IS FAIRLY DRY AND UNDER THE INFLUENCE STRONG SUBSIDENCE WITH DRY 
AND STABLE AIR AT THE MIDDLE AND UPPER LEVELS. SURFACE RIDGING 
WILL DOMINATE ACROSS THE CENTRAL AND WESTERN ATLC. THE FRONT IS 
FORECAST TO MOVE INTO THE EASTERN ATLC SUN AND MON WHERE IT WILL 
DISSIPATE.

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

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DGS