000 AXPZ20 KNHC 291000 TWDEP TROPICAL WEATHER DISCUSSION NWS NATIONAL HURRICANE CENTER MIAMI FL 1005 UTC SUN APR 29 2012 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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 0900 UTC. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... THE MONSOON TROUGH EXTENDS FROM 10N86W TO 05N101W TO 06N116W. THE ITCZ AXIS EXTENDS FROM 06N116W TO 03N140W. SCATTERED MODERATE ISOLATED STRONG CONVECTION IS WITHIN 120 NM OF THE MONSOON TROUGH BETWEEN 92W AND 104W. SCATTERED MODERATE CONVECTION NEAR THE ITCZ AXIS IS WITHIN 60 NM OF 04N126W. ...DISCUSSION... STRONG 1034 MB HIGH PRES IS CENTERED NEAR 34N142W WITH A RIDGE EXTENDING SE TO NEAR 17N110W. THE PRESSURE GRADIENT BETWEEN THIS FEATURE AND TROUGH ASSOCIATED WITH THE INTERTROPICAL CONVERGENCE ZONE IS MAINTAINING FRESH N-NE WINDS IN A BROAD AREA N OF 10N W OF 120W...OR ROUGHLY NW OF A LINE FROM 30N120W TO 18N128W TO 06N128W TO 04N140W...DEPICTED BY THE LATEST COMPOSITE OF ASCAT SCATTEROMETER PASSES. THE AREA OF HIGH PRESSURE WILL SLOWLY SHIFT W-NW AND SLIGHTLY WEAKEN OVER THE NEXT TWO DAYS...WHICH WILL ALLOW THE REGION OF HIGHEST TRADES AND WIND-DRIVEN SEAS TO GRADUALLY SHIFT W OF 130W BY MON. GALE FORCE WINDS N OF THE AREA ALONG THE CALIFORNIA COAST HAS BROUGHT NLY SWELL INTO THE N PART OF THE AREA...WITH COMBINED SEAS TO 12 FT NEAR 30N121W. GFS MODEL GUIDANCE SHOWS A TROUGH DEVELOPING SW OF SAN DIEGO OVER THE NEXT 12-24 HOURS AND PERSISTING THROUGH MON NIGHT. THE TROUGH WILL REDUCE THE PRES GRADIENT ALONG THE COAST OF SOUTHERN CALIFORNIA AND ALLOW SEAS TO SUBSIDE TO 8-9 FT N OF 27N W OF 123W THE NEXT TWO DAYS. E OF 110W...GENTLE TO MODERATE BREEZE AND SEAS BELOW 8 FT ARE NOTED WITH CROSS EQUATORIAL SW SWELL WITH PERIODS IN THE 13-15 SECOND RANGE. LITTLE CHANGE TO THIS SYNOPTIC WEATHER PATTERN IS EXPECTED THROUGH TUE. $$ MUNDELL