732  
AXPZ20 KNHC 231510  
TWDEP  
 
TROPICAL WEATHER DISCUSSION  
NWS NATIONAL HURRICANE CENTER MIAMI FL  
1605 UTC SUN APR 23 2017  
 
TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM  
THE EQUATOR TO 32N, EAST OF 140W. 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.  
   
..INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH
 
 
 
THE ITCZ EXTENDS FROM 06N90W TO 05N127W TO 02N140W. SCATTERED  
MODERATE ISOLATED STRONG CONVECTION IS NOTED WITHIN 90 NM EITHER  
SIDE OF A LINE FROM 09N115W TO 04N133W.  
   
..DISCUSSION
 
 
 
OFFSHORE WATERS WITHIN 250 NM OF MEXICO...  
 
A WEAKENING COLD FRONT NEAR 32N120W IS BRIDGED BY A SURFACE  
RIDGE FROM 23N116W TO 12N94W. GENTLE TO MODERATE NORTHWESTERLY  
WINDS ARE OBSERVED WEST OF SOUTHERN MEXICO, WITH 5-8 FT SEAS IN  
LONG PERIOD NW SWELL. A TIGHTENING PRESSURE GRADIENT IS ALREADY  
SUPPORTING A MODERATE TO FRESH NW WINDS NORTH OF 27N. EXPECT  
FRESH TO STRONG NW WINDS AND SEAS OF 8-12 FT FROM 29N TO 32N  
THROUGH MON NIGHT. THESE CONDITIONS WILL SPREAD SOUTHWARD ON  
TUESDAY AND REACH AS FAR SOUTH AS 26N BY TUESDAY NIGHT. STRONG  
TO NEAR GALE FORCE NORTHWESTERLY WINDS EXPECTED N OF 29N LATE  
WED NIGHT THROUGH FRI NIGHT WITH COMBINED SEAS OF 11 TO 16 FT.  
 
GULF OF CALIFORNIA: VARIABLE WINDS AROUND A WEAK SURFACE LOW N  
OF 30N. FRESH TO STRONG NOCTURNAL SW WINDS ARE EXPECTED EACH  
NIGHT ACROSS THE GULF WATERS FROM 29.5N TO 31N, WITH SEAS  
BUILDING TO ABOUT 5 FT.  
 
GULF OF TEHUANTEPEC: MODERATE TO FRESH NORTHERLY DRAINAGE FLOW  
THIS MORNING WILL INCREASE TONIGHT TO NEAR GALE FORCE BY MONDAY  
MORNING, WITH SEAS BUILDING TO 11 FT DOWNSTREAM OF THE GULF NEAR  
14.5N95W. THE PRESSURE GRADIENT WILL QUICKLY RELAX MONDAY WITH  
WINDS LESS THAN 20 KT AND SEAS LESS THAN 8 FT BY MONDAY NIGHT.  
 
OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND  
WITHIN 750 NM OF ECUADOR...  
 
LIGHT TO GENTLE WINDS MOSTLY ONSHORE FLOW EXPECTED DURING THE  
DAY BECOMING OFFSHORE ALONG THE COASTS AT NIGHT. COMBINED SEAS  
OF 3 TO 5 FT IN MIXED SW AND NW SWELL FORECAST DURING THE NEXT  
SEVERAL DAYS.  
 
REMAINDER OF THE AREA...  
 
A COLD FRONT FROM 30N121W TO 23N138W WILL LOSE IDENTITY TONIGHT  
SOUTH OF 30N. EXPECT NW SWELL TO PROPAGATE EASTWARD TODAY, THEN  
SUBSIDE FROM THE NW MONDAY THROUGH WEDNESDAY. STRONG NW WINDS  
AND SEAS TO 12 FT ARE EXPECTED NORTH OF 29.5N EAST OF 123W  
TONIGHT THROUGH EARLY WED, WITH SIMILAR CONDITIONS NORTH OF 28N  
EAST OF 126W THURSDAY.  
 

 
MUNDELL  
 
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