000 AXPZ20 KNHC 290935 TWDEP TROPICAL WEATHER DISCUSSION NWS NATIONAL HURRICANE CENTER MIAMI FL 1005 UTC SUN MAR 29 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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 0900 UTC. ...SPECIAL FEATURES... GALE-FORCE WINDS ARE IN THE NORTHERN GULF OF CALIFORNIA...TO THE NORTH OF 29N...BASED ON THE SURFACE PRESSURE GRADIENT THAT IS BETWEEN A 993 MB GREAT BASIN LOW PRESSURE CENTER AND THE NORTHEASTERN PACIFIC OCEAN SUBTROPICAL RIDGE. AN EARLIER ASCAT PASS INDICATED S-SW WINDS OF 20-25 KT ACROSS THE GULF N OF 29N WHILE PUERTO PENASCO WAS ALSO REPORTING SUSTAINED SOUTHERLY WINDS OF 25 KT. A TROUGH EXTENDS FROM THE LOW PRES CENTER ACROSS THE NORTHERN PART OF THE GULF OF CALIFORNIA NEAR 31N114W TO 28N115W. SEAS ARE EXPECTED TO BUILD TO 9 FT. THE WINDS ARE EXPECTED TO QUICKLY DIMINISH BEGINNING THIS MORNING AND WILL BE 20 KT OR LESS BY TONIGHT. SEE LATEST NWS HIGH SEAS FORECAST UNDER AWIPS/WMO HEADERS MIAHSFEP2/FZPN03 KNHC FOR MORE DETAILS. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... A SURFACE TROUGH EXTENDS FROM 08N92W TO 03N100W TO 07N114W. THE NORTHERN ITCZ AXIS CONTINUES FROM 07N114W TO 05N130W TO BEYOND 05N140W. SCATTERED MODERATE ISOLATED STRONG CONVECTION IS FROM 05N TO 10N BETWEEN 115 AND 121W. A SECOND ITCZ AXIS IS SOUTH OF THE EQUATOR AND EXTENDS FROM 07S93W TO 03.4S100W TO 00N111W. SCATTERED MODERATE CONVECTION IS FROM 02.0S TO 03.4S BETWEEN 100W AND 108W. ...DISCUSSION... A 1036 MB HIGH PRES LOCATED WELL N OF THE DISCUSSION AREA NEAR 48N135W EXTENDS A RIDGE AXIS S THEN SE TO NEAR CLARION ISLAND. THE PRESSURE GRADIENT BETWEEN THE HIGH AND LOWER PRESSURE IN THE VICINITY OF THE ITCZ IS MAINTAINING MODERATE TO LOCALLY FRESH TRADES ACROSS THE WESTERN WATERS MAINLY FROM 06N-20N W OF 125W. SEAS OF 6 TO 8 FT ARE NOTED PER ALTIMETER DATA WITHIN THE AREA OF TRADES. MODERATE TO LOCALLY FRESH N-NE WINDS ARE ALSO SEEN PER SCATTEROMETER DATA ACROSS THE WATERS N OF 20N W OF 120W. THE 0430 UTC ASCAT-B PROVIDED OBSERVATIONS OF NW WINDS IN THE 15-20 KT RANGE N OF 25N E OF 120W TO THE COAST OF BAJA CALIFORNIA PENINSULA. THE HIGH PRES WILL MOVE TO THE N AS A COLD FRONT APPROACHES FROM THE WEST. A NEW HIGH PRES CENTER IS FORECAST TO DEVELOP NEAR 38N133W IN ABOUT 24 HOURS. THE COLD FRONT IS FORECAST TO REACH 30N140W BY LATE WED. SOUTHERLY WINDS OF 15-20 KT ARE EXPECTED AHEAD OF THE FRONT ACROSS THE FAR NW WATERS BY WED MORNING. THEN...WINDS WILL FURTHER INCREASE TO 25 KT BY WED AFTERNOON. A NEW SWELL EVENT WILL FOLLOW THE FRONT BUILDING SEAS TO 11 FT NW OF A LINE FROM 30N135W TO 24N140W BY WED NIGHT. SEAS ASSOCIATED WITH AN AREA OF STRONG TO GALE FORCE NORTHERLY WINDS OFF THE COAST OF CALIFORNIA WILL CONTINUE TO PROPAGATE ACROSS THE N WATERS...ESPECIALLY N OF 27N BETWEEN 116W AND 125W BY TONIGHT. EXPECT BUILDING SEAS TO 9 FT WITHIN THIS AREA. CROSS EQUATORIAL SW SWELL WILL CONTINUE TO PROPAGATE ACROSS THE S-CENTRAL WATERS DURING THE NEXT 24 HOURS WITH BUILDING SEAS OF 8-9 FT COVERING THE WATERS S OF A LINE FROM 03.4S90W TO 12N113W TO 10N124W TO 00N120W BY TONIGHT. THESE SEAS WILL BEGIN TO SUBSIDE ON WED. A SURFACE TROUGH IS FORECAST TO DEVELOP WITHIN THE ITCZ NEAR 115W TODAY...EXTENDING FROM 13N115W TO 04N118W TONIGHT. SOME CONVECTION IS ALREADY IN PLACE. THE TROUGH WILL DRIFT WESTWARD AND DEVELOP A WEAK LOW ALONG THE AXIS NEAR 05N122W BY LATE WED. AN AREA OF 8 FT SEAS TO THE W OF THE TROUGH WILL MERGE WITH THE ABOVE MENTIONED CROSS EQUATORIAL SW SWELL BY TONIGHT. GAP WINDS... GULF OF PAPAGAYO...WINDS ARE FORECAST TO DIMINISH TO 20 KT OR LESS ACROSS THE GULF LATE THIS MORNING. GULF OF PANAMA...MODERATE TO FRESH NORTHERLY WINDS ARE FUNNELING INTO THE GULF OF PANAMA FROM THE SW CARIBBEAN DURING LATE NIGHT AN EARLY MORNING HOURS. THIS WEATHER PATTERN IS EXPECTED ONCE AGAIN TONIGHT. $$ GR