000
AXPZ20 KNHC 041525
TWDEP 

TROPICAL WEATHER DISCUSSION                                     
NWS NATIONAL HURRICANE CENTER MIAMI FL                         
1605 UTC SAT APR 04 2015

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. 
 
...SPECIAL FEATURES... 

GULF OF TEHUANTEPEC GALE WARNING...HIGH PRESSURE EXTENDING 
SOUTHWARD ALONG THE EASTERN MEXICAN COASTAL PLAINS THROUGH SE 
MEXICO IS BEGINNING TO PRODUCE A TIGHT PRESSURE GRADIENT WITH A 
SMALL AREA OF FRESH TO STRONG NORTHERLY WINDS ALREADY PRESENT IN 
THE GULF. THE NORTHERLY WINDS WILL GRADUALLY INCREASE THROUGHOUT 
THE DAY...EVENTUALLY REACHING 30-35 KT MINIMAL GALE FORCE THIS 
EVENING. THE GALE WILL PERSIST THROUGH SUN MORNING WITH SEAS 
BUILDING TO 10-14 FT. WINDS WILL THEN DIMINISH BELOW GALE FORCE 
ON SUN AFTERNOON. EXPECT LINGERING FRESH TO STRONG NORTHERLY 
WINDS IN THE IMMEDIATE GULF SUN NIGHT INTO EARLY MON MORNING.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... 

THE ITCZ AXIS EXTENDS FROM 07N100W TO 06N114W TO 04N120W TO 
03N125W TO 04N140W. SCATTERED MODERATE CONVECTION IS WITHIN 60-
75 NM EITHER SIDE OF THE AXIS BETWEEN 100W AND 109W...AND ALSO 
BETWEEN 111W AND 117W.

...DISCUSSION... 
    
HIGH PRESSURE RIDGING EXTENDS FROM 32N135W TO 18N108W. THE HIGH 
PRESSURE RIDGING COMBINED WITH LOWER PRESSURE NEAR THE ITCZ IS 
SUPPORTING AN AREA OF FRESH TRADE WINDS ACROSS THE WEST-CENTRAL 
WATERS. COMBINED SEAS OF 8-10 FT ARE DUE TO FRESH NE SWELL AND 
LONG PERIOD NW SWELL. THESE CONDITIONS WILL PERSIST THROUGH MON 
MORNING.

FRESH TO STRONG WINDS NORTH OF THE AREA AND NEAR THE COAST OF 
CALIFORNIA WILL CONTINUE TO GENERATE FRESH NORTHERLY SWELLS 
WHICH ARE PROPAGATING SOUTHWARD INTO THE NORTHERN FORECAST 
WATERS MAINLY N OF 27N BETWEEN 120W AND 130W WITH SEA HEIGHTS OF 
8-9 FT. THE WINDS AND ASSOCIATED SWELLS WILL DIMINISH AND DECAY 
BY MON MORNING.

E OF 110W...MAINLY LIGHT TO GENTLE WINDS ARE SEEN BASED ON 
SCATTEROMETER DATA WITH THE EXCEPTION OF THE GAP WIND REGIONS OF 
TEHUANTEPEC...PAPAGAYO AND PANAMA.

GAP WINDS...                                                  
GULF OF PAPAGAYO...WINDS WILL CONTINUE TO PULSE TO FRESH TO 
STRONG LEVELS IN AND DOWNWIND OF THE GULF DURING THE NEXT FEW 
DAYS...STRONGEST DURING THE LATE NIGHT AND EARLY MORNING 
HOURS...MAINLY DUE TO HIGH PRESSURE BUILDING ACROSS THE NW 
CARIBBEAN AND NORTHERN CENTRAL AMERICA...AIDED BY NOCTURNAL 
DRAINAGE FLOW.

GULF OF PANAMA...MODERATE TO FRESH NORTHERLY WINDS ARE EXPECTED 
ACROSS THE GULF AND DOWNWIND TO ABOUT 06N OVER THE NEXT COUPLE 
OF DAYS WITH SEAS OF 5-7 FT.

$$ 
LEWITSKY