527  
AXPZ20 KNHC 232157  
TWDEP  
 
TROPICAL WEATHER DISCUSSION  
NWS NATIONAL HURRICANE CENTER MIAMI FL  
2205 UTC MON APR 23 2018  
 
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 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH  
2145 UTC.  
   
..INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH
 
 
 
A SURFACE TROUGH EXTENDS SOUTHWEST FROM THE PACIFIC COAST OF  
PANAMA AT 08N79W TO 06N97W WHERE SCATTEROMETER WINDS INDICATE  
THAT AN ITCZ DEVELOPS AND CONTINUES WEST-NORTHWEST TO 08N120W,  
THEN TURNS SOUTHWEST TO 05N129W, THEN TURNS WEST-NORTHWEST TO  
BEYOND 06N140W. SCATTERED MODERATE AND ISOLATED STRONG  
CONVECTION IS NOTED WITHIN 150 NM OF 06N83W, WITHIN 240 NM  
EITHER SIDE OF A LINE FROM 08N91W TO 11N117W TO 07N125W, AND  
WITHIN 150 NM EITHER SIDE OF A LINE FROM 06N129W TO 08N140W.  
   
..DISCUSSION
 
 
OFFSHORE WATERS WITHIN 250 NM OF MEXICO...  
 
A NORTHWEST TO SOUTHEAST RIDGE WILL MEANDER FROM 23N116W TO  
12N94W FOR THE NEXT SEVERAL DAYS WITH GENTLE TO MODERATE  
NORTHWEST WINDS, AND 4 TO 7 FT SEAS, FORECAST ACROSS THE OPEN  
WATERS WEST OF THE BAJA PENINSULA. THE PRESSURE GRADIENT IS  
FORECAST TO TIGHTEN ON WED RESULTING IN MODERATE TO FRESH  
NORTHWEST FLOW WITHIN ABOUT 60 NM OF THE WEST COAST OF THE  
CENTRAL BAJA PENINSULA ON THU, AND FRESH TO LOCALLY STRONG FLOW  
EXPECTED ON FRI.  
 
GULF OF CALIFORNIA: LIGHT TO GENTLE VARIABLE WINDS ARE FORECAST  
THIS WEEK.  
 
GULF OF TEHUANTEPEC: FRESH TO LOCALLY STRONG NOCTURNAL FLOW  
WILL CONTINUE THIS WEEK.  
 
OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND  
WITHIN 750 NM OF ECUADOR...  
 
GULF OF PAPAGAYO: FRESH TO LOCALLY STRONG NORTHEAST NOCTURNAL  
WINDS EXPECTED TONIGHT AND ON TUE NIGHT, WITH SEAS BUILDING TO  
AS HIGH AS 7 FT DOWNSTREAM NEAR 11N88W. MODERATE TO LOCALLY  
FRESH NOCTURNAL DRAINAGE FLOW EXPECTED TO RESUME ON WED NIGHT.  
 
GULF OF PANAMA: GENTLE NOCTURNAL FLOW FORECAST THIS WEEK.  
 
ELSEWHERE, GENTLE TO MODERATE OFFSHORE FLOW WILL PREVAIL  
GENERALLY N OF 09N, WHILE LIGHT TO GENTLE SW WINDS ARE FORECAST  
S OF 09N.  
 
REMAINDER OF THE AREA...  
 
A 1023 MB SURFACE HIGH IS CENTERED AT 33N135W WITH A RIDGE  
EXTENDING SOUTHEAST TO NEAR 12N94W. NORTHERLY SWELL IN THE FORM  
OF 7 TO 9 FT SEAS CURRENTLY OBSERVED ACROSS THE WATERS FROM 30N  
TO 32N BETWEEN 120W AND 132W, WILL SUBSIDE TO LESS THAN 8 FT  
OVERNIGHT. FRESH NORTHEAST TRADES, AND 6 TO 8 FT SEAS, ARE  
OBSERVED ACROSS THE TROPICAL WATERS SOUTH OF THE RIDGE AND NORTH  
OF THE THE ITCZ, WITH LITTLE CHANGE FORECAST THROUGH THE  
REMAINDER OF THIS WEEK.  
 
THE SURFACE HIGH WILL MOVE NORTH OVERNIGHT ALLOWING A WEAK COLD  
FRONT TO MOVE INTO THE FAR NORTHWEST WATERS ON TUE AND QUICKLY  
WASH OUT. A ROUND OF NORTHWEST SWELL, IN THE FORM OF 7 TO 9 FT  
SEAS, WILL ACCOMPANY THE FRONT AND THEN GRADUALLY SUBSIDE  
THROUGH WED.  
 
SOUTHERLY SWELL, IN THE FORM OF 7 TO 9 FT SEAS, CURRENTLY  
OBSERVED BETWEEN THE EQUATOR AND 03.4S WILL GRADUALLY SUBSIDE  
THROUGH THU.  
 

 
NELSON  
 
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