751  
AXPZ20 KNHC 120318  
TWDEP  
 
TROPICAL WEATHER DISCUSSION  
NWS NATIONAL HURRICANE CENTER MIAMI FL  
0405 UTC MON APR 12 2021  
 
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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH  
0220 UTC.  
   
..INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH
 
 
A SURFACE TROUGH EXTENDS FROM 10N74W TO 10N80W TO 06N90W TO  
07N100W. THE ITCZ CONTINUES FROM 06N101W TO 05N123W TO BEYOND  
03.5N140W. SCATTERED MODERATE ISOLATED STRONG CONVECTION IS  
NOTED WITHIN 120 NM N OF ITCZ BETWEEN 116W AND 140W.  
 
OFFSHORE WATERS WITHIN 250 NM OF MEXICO...  
 
A RIDGE OF HIGH PRESSURE PREVAILS WEST OF THE BAJA CALIFORNIA,  
AND EXTENDS SOUTHEAST TO OFFSHORE OF CABO CORRIENTES ALONG 112W.  
THE PRESSURE GRADIENT BETWEEN THE RIDGE AND A TROUGH OVER MEXICO  
IS SUPPORTING FRESH NORTHERLY WINDS OFF OF BAJA CALIFORNIA NORTE,  
AND MODERATE WINDS OFF BAJA CALIFORNIA SUR. LIGHT TO GENTLE  
WESTERLY WINDS PREVAIL ELSEWHERE ACROSS THE OFFSHORE WATERS. SEAS  
ARE IN THE 5-10 FT RANGE WEST OF BAJA CALIFORNIA, 3-6 FT OVER  
THE REMAINDER OF THE OPEN WATERS OFF MEXICO, AND 1-3 FT OVER THE  
GULF OF CALIFORNIA.  
 
MODERATE TO FRESH NW WINDS WILL PREVAIL WEST OF BAJA CALIFORNIA  
NORTE INTO MON AS THE RIDGE PERSISTS. INCREASED NW SWELL OFF  
BAJA CALIFORNIA NORTE WILL PREVAIL INTO WED, PEAKING AT 8-11 FT  
MON MORNING, HIGHEST ACROSS THE OUTER WATERS. GENTLE TO MODERATE  
WINDS ARE EXPECTED ELSEWHERE INTO WED. WINDS AND SEAS ARE  
EXPECTED TO DIMINISH SLIGHTLY AREAWIDE MON THROUGH WED AS THE  
HIGH PRESSURE WEAKENS.  
 
OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND  
WITHIN 750 NM OF ECUADOR...  
 
LIGHT TO GENTLE MOSTLY ONSHORE WINDS PREVAIL ACROSS THE FORECAST  
AREA, WITH SEAS IN THE 3-5 FT RANGE. LITTLE CHANGE IN WIND AND  
WAVE CONDITIONS ARE EXPECTED INTO TUE, BEFORE MODERATE OFFSHORE  
GAP WINDS BEGIN ACROSS THE PAPAGAYO REGION. MODERATE SIZED SW  
SWELL CROSSING THE EQUATOR TONIGHT WILL MOVE THROUGH THE  
OFFSHORE WATERS MON NIGHT THROUGH THU.  
 
REMAINDER OF THE AREA...  
 
A WEAK SURFACE TROUGH ASSOCIATED WITH PERSISTENT DEEP AREA OF  
LOW PRESSURE LOCATED W OF THE NW WATERS CONTINUES NEARLY N TO S  
ALONG 143W. MODERATE SE WINDS AND SEAS OF 6 TO 8 FT PREVAIL  
ACROSS THE FAR NW WATERS E OF THE TROUGH FROM 27N TO 30N.  
SCATTERED MODERATE CONVECTION IS SEEN EAST OF THIS TROUGH FROM  
28N TO 30N BETWEEN 132W AND 135W. HIGH PRESSURE EXTENDS  
SOUTHWARD ACROSS THE NORTHERN WATERS BETWEEN THIS TROUGH AND  
110W. THIS IS PRODUCING A MODEST PRESSURE GRADIENT OVER THE  
FORECAST WATERS SOUTH OF THE RIDGE. MODERATE WINDS AND SEAS OF  
5-8 FT PREVAIL THERE. LITTLE SIGNIFICANT CHANGE IS EXPECTED THE  
NEXT COUPLE OF DAYS. HIGH PRESSURE WILL SHIFT INTO THE NORTHERN  
WATERS THROUGH TUE, AND SLIGHTLY STRENGTHEN TRADE WINDS NORTH OF  
THE ITCZ. NORTHERLY SWELL WILL PROPAGATE SOUTH OF 30N ACROSS THE  
WATERS BETWEEN 118W AND 130W THROUGH WED. SEAS OVER THIS AREA  
WILL BUILD TO AROUND 9-11 FT TONIGHT THEN GRADUALLY DIMINISH TO  
8-9 FT BY TUE.  
 

 
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