271  
AXPZ20 KNHC 282119  
TWDEP  
 
TROPICAL WEATHER DISCUSSION  
NWS NATIONAL HURRICANE CENTER MIAMI FL  
2205 UTC TUE MAR 28 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 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH  
2100 UTC.  
   
..INTERTROPICAL CONVERGENCE ZONE
 
 
 
THE INTERTROPICAL CONVERGENCE ZONE AXIS EXTENDS FROM 06N86W TO  
04N95W TO 03N103W. SCATTERED MODERATE AND ISOLATED STRONG  
CONVECTION FROM 04N TO 07N BETWEEN 87W AND 90W. SCATTERED  
MODERATE CONVECTION IS WITHON 90 NM EITHER SIDE OF AXIS BETWEEN  
90W AND 100W.  
   
..DISCUSSION
 
 
 
OFFSHORE WATERS WITHIN 250 NM OF MEXICO...  
 
HIGH PRESSURE NORTH OF THE AREA EXTENDS A RIDGE SOUTHEAST TO  
NEAR THE REVILLAGIGEDO ISLANDS. THE PRESSURE GRADIENT BETWEEN  
THE RIDGE AND LOWER PRESSURE INLAND OVER MEXICO IS SUPPORTING  
FRESH TO STRONG NW WINDS WEST OF BAJA CALIFORNIA NORTE AND  
MODERATE TO FRESH N-NW WINDS WEST OF BAJA CALIFORNIA SUR. GALE  
FORCE WINDS OFF THE COAST OF SOUTHERN CALIFORNIA WILL CONTINUE TO  
GENERATE LARGE LONG PERIOD NW SWELL THAT WILL PROPAGATE INTO THE  
WATERS OFF BAJA CALIFORNIA AND PEAK NEAR 13 FT THROUGH MONDAY  
MORNING. THE HIGH PRESSURE WILL REMAIN NEARLY STATIONARY OVER  
THE NEXT 48 HOURS.  
 
LIGHT WINDS AND SEAS PREVAIL OVER THE GULF OF CALIFORNIA, EXCEPT  
IN THE NORTHERN GULF WHERE NORTHWEST WINDS ARE 20-25 KT DUE TO A  
LOCALLY TIGHT PRESSURE GRADIENT. SEAS WILL BUILD TO 4-7 FT WITH  
THESE WINDS. THE WINDS WILL DIMINISH TONIGHT AS THE HIGH WEAKENS  
SLIGHTLY.  
 
LIGHT TO GENTLE WINDS WILL PREVAIL ELSEWHERE THROUGH THE WEEK.  
 
OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND  
WITHIN 750 NM OF ECUADOR...  
 
GAP WINDS ARE NOT EXPECTED TO BE VERY SIGNIFICANT THE NEXT FEW  
DAYS ACROSS CENTRAL AMERICA. LIGHT TO GENTLE WINDS AND 3-5 FT  
SEAS ARE EXPECTED TO PREVAIL OVER THE FORECAST WATERS THE NEXT  
SEVERAL DAYS.  
 
REMAINDER OF THE AREA...  
 
HIGH PRESSURE OF 1031 MB LOCATED NORTH OF AREA NEAR 34N131W  
DOMINATES THE NORTH FORECAST WATERS. THE PRESSURE GRADIENT  
BETWEEN THIS HIGH AND THE NEAR-EQUATORIAL TROUGH IS SUPPORTING  
FRESH TO STRONG TRADES FROM ROUGHLY 10N-21N WEST OF 125W. SEAS  
OVER THIS AREA ARE IN THE 8-11 FT RANGE IN A MIX OF LONG PERIOD  
NW SWELL AND NE WIND WAVES. THE AERIAL EXTENT OF THE TRADES WILL  
DIMINISH THROUGH WEDNESDAY AS THE HIGH PRESSURE MOVES TOWARD THE  
SW AND WEAKENS SLIGHTLY. MARINE CONDITIONS OVER THE FORECAST  
AREA WILL CHANGE LITTLE DURING THE NEXT 48 HOURS UNDER THE  
INFLUENCE OF THIS BROAD RIDGE.  
 

 
GR  
 
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