144  
AXNT20 KNHC 261709  
TWDAT  
 
TROPICAL WEATHER DISCUSSION  
NWS NATIONAL HURRICANE CENTER MIAMI FL  
109 PM EDT WED APR 26 2017  
 
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  
1600 UTC.  
   
..ITCZ/MONSOON TROUGH
 
 
THE MONSOON TROUGH EXTENDS SW FROM THE COAST OF WESTERN AFRICA  
NEAR 10N14W TO 05N17W. THE INTERTROPICAL CONVERGENCE ZONE  
CONTINUES FROM 05N17W TO 02N30W TO THE COAST OF SOUTH AMERICA  
NEAR 01N51W. CLUSTERS OF MODERATE TO STRONG CONVECTION ARE FROM  
01N TO 09N BETWEEN 08W AND 16W. ISOLATED MODERATE CONVECTION IS  
WITHIN 120 NM OF EITHER SIDE OF THE ITCZ AXIS.  
   
..DISCUSSION
 
 
GULF OF MEXICO...  
 
THE PRESSURE GRADIENT BETWEEN ATLANTIC HIGH PRESSURE AND LOW  
PRESSURE OVER TEXAS SUPPORTS FRESH TO STRONG SOUTHERLY WINDS OVER  
THE WESTERN GULF AND MODERATE SOUTHERLY WINDS OVER THE EASTERN  
GULF. THE ONLY EXCEPTION IS LIGHT TO GENTLE WINDS OVER THE  
NORTHEASTERN GULF, NEAR A WEAK HIGH CENTER INLAND OVER SOUTHERN  
GEORGIA. THE BASIN IS ESSENTIALLY CONVECTION FREE EXCEPT FOR  
SHOWERS ASSOCIATED WITH A PRE-FRONTAL TROUGH THAT IS JUST ABOUT TO  
MOVE OFFSHORE THE TEXAS COAST. OVER THE NEXT 24 HOURS A COLD  
FRONT WILL CLIP THE NORTHWESTERN GULF WITH SHOWERS AND  
THUNDERSTORMS POSSIBLE EAST OF THE FRONT. WINDS WILL INCREASE  
ACROSS THE EASTERN GULF AND BECOME BRIEFLY FRESH AND NORTHERLY  
BEHIND THE FRONT OVER THE NORTHWESTERN GULF.  
 
CARIBBEAN SEA...  
 
HIGH PRESSURE WELL NORTHEAST OF THE CARIBBEAN BASIN AND LOWER  
PRESSURES OVER SOUTH AMERICA SUPPORT MAINLY MODERATE EAST TO  
SOUTHEAST WINDS OVER THE CARIBBEAN TODAY. LOCALLY FRESH TO STRONG  
WINDS ARE OCCURRING NEAR THE COAST OF NORTHEAST COLOMBIA, AND THE  
NORTHERN COASTS OF VENEZUELA AND HONDURAS. DRY AIR AND SUBSIDENCE  
ARE LIMITING CONVECTION TO JUST SOME PATCHES OF SHOWERS IN THE  
TRADE WIND FLOW PRIMARILY OVER THE NORTH CENTRAL AND EASTERN  
CARIBBEAN. LITTLE CHANGE IS EXPECTED OVER THE NEXT 24 HOURS.  
   
..HISPANIOLA
 
 
LOW LEVEL MOISTURE AND DAYTIME HEATING IS SUPPORTING TERRAIN  
INDUCED SHOWERS OVER THE AREA TODAY. EXPECT MOST SHOWERS TO  
DIMINISH BY SUNSET, EXCEPT FOR A FEW PASSING SHOWERS IN THE TRADE  
WIND FLOW NEAR THE SOUTH AND EAST COASTS OVERNIGHT TONIGHT. THIS  
PATTERN IS EXPECTED TO REPEAT ITSELF THURSDAY.  
 
ATLANTIC OCEAN...  
 
A DISSIPATING COLD FRONT EXTENDS INTO THE AREA OF DISCUSSION NEAR  
31N70W TO 28N72W. A PRE-FRONTAL TROUGH EXTENDS FROM 28N69W TO  
20N69W. ANY SIGNIFICANT CONVECTION ASSOCIATED WITH THESE  
BOUNDARIES HAS DISSIPATED. WEAK HIGH PRESSURE COVERS THE REMAINDER  
OF THE SW N ATLANTIC. ANOTHER SURFACE TROUGH, FORMALLY A FRONTAL  
BOUNDARY, EXTENDS FROM 26N50W TO 28N60W. SCATTERED SHOWERS ARE  
WITHIN 120 NM OF EITHER SIDE OF THIS TROUGH AXIS. A BROAD AREA OF  
LOW PRESSURE OF 1006 MB CENTERED NORTH OF THE AREA NEAR 36N23W  
SUPPORTS A SURFACE TROUGH FROM 31N23W TO 27N27W. SCATTERED SHOWERS  
AND ISOLATED THUNDERSTORMS ARE WITHIN 180 NM EAST OF THE TROUGH  
AXIS. OVER THE NEXT 24 HOURS AN UPPER TROUGH WILL DEVELOP NEAR THE  
BAHAMAS SUPPORTING SCATTERED SHOWERS AND THUNDERSTORMS.  
 
FOR ADDITIONAL INFORMATION PLEASE VISIT  
HTTP://WWW.HURRICANES.GOV/MARINE  
 

 
LATTO  
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab TPC Page Main Text Page