000 AXPZ20 KNHC 050222 TWDEP TROPICAL WEATHER DISCUSSION NWS NATIONAL HURRICANE CENTER MIAMI FL 0405 UTC SUN APR 05 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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 0215 UTC. ...SPECIAL FEATURES... GULF OF TEHUANTEPEC GALE WARNING...20-30 KT NORTHERLY FLOW WILL QUICKLY INCREASE REACHING 30-35 KT MINIMAL GALE FORCE EARLY TONIGHT. THE GALE WILL PERSIST THROUGH EARLY MORNING ON SUN WITH SEAS BUILDING TO 14 FT. EXPECT NORTHERLY 20-25 KT CONDITIONS ON SUN NIGHT INTO MON MORNING. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... A SOUTHERN HEMISPHERE ITCZ IS ANALYZED FROM 04.5S86W TO 02S100W TO 03.45S112W. SCATTEROMETER WINDS INDICATE THAT THE NORTHERN HEMISPHERE ITCZ IS ALONG 04.5N89W TO 02N100W TO 05N115W TO BEYOND 04.5N140W. SCATTERED MODERATE ISOLATED STRONG CONVECTION IS NOTED ALONG THE SOUTHERN ITCZ WITHIN 45 NM EITHER SIDE OF A LINE FROM 05.4S86W TO 02S93W AND WITHIN 75 NM EITHER SIDE OF A LINE FROM 02S102W TO 03.4S113W. SIMILAR CONVECTION IS OBSERVED ALONG THE NORTHERN HEMISPHERE ITCZ WITHIN 60 NM EITHER SIDE OF A LINE FROM 04N87W TO 03N97W AND WITHIN 150 NM EITHER SIDE OF A LINE FROM 09N104W TO 07N118W TO 04N140W. ...DISCUSSION... AN UPPER TROUGH EXTENDS SW FROM 32N119W TO 19N138W. A SECOND UPPER TROUGH IS OVER THE FAR NW PORTION OF THE DISCUSSION AREA. AN UPPER ANTICYCLONE IS OVER THE PACIFIC COAST OF COLOMBIA AT 05N77W WITH AN UPPER RIDGE EXTENDING NW THROUGH ANOTHER UPPER ANTICYCLONE AT 12N95W TO BEYOND 32N111W. A 150 NM WIDE BAND OF UPPER MOISTURE EXTENDS FROM 29N137W TO OVER NORTHERN CALIFORNIA. A LARGE UPPER MOISTURE PLUME IS STREAMING ACROSS THE UPPER RIDGE COVERING THE DISCUSSION AREA FROM 17-30N BETWEEN 117-92W...AND IS REINFORCED BY DEBRIS MOISTURE FROM THE ITCZ RELATED CONVECTION PREVIOUSLY DESCRIBED NEAR 110W. UPPER SUBSIDENCE IS INDICATED ACROSS THE TROPICAL WATERS E OF 95W AND IS SUPPRESSING CONVECTION IN THIS AREA. AT THE LOW LEVELS A SURFACE RIDGE EXTENDS FROM 32N140W TO 15N102W. ALTHOUGH THE NORTHERLY FLOW N OF THE RIDGE CONTINUES AT 15-20 KT...COMBINED SEAS ARE 7-9 FT IN MIXED N AND S SWELL ACROSS THE DISCUSSION WATERS FROM 26-32N BETWEEN 119-127W PER A RECENT ALTIMETER PASS. THESE ENHANCED SEAS WILL PROPAGATE E REACHING ALONG THE PACIFIC COAST OF THE NORTHERN BAJA PENINSULA ON SUN...THEN SUBSIDE TO 5-7 FT ON MON. THE GRADIENT SW OF THE RIDGE IS SUPPORTING NE TRADES OF 15-20 KT ACROSS THE DISCUSSION WATERS BETWEEN THE ITCZ AND THE RIDGE. LONG PERIOD NE...S AND NW SWELL ARE MIXING WITH COMBINED SEAS OF 7-9 FT ACROSS THE DISCUSSION WATERS FROM 06-20N BETWEEN 125-140W. THESE SWELLS WILL GRADUALLY SUBSIDE THROUGH THE MIDDLE OF NEXT WEEK. GULF OF PAPAGAYO...EXPECT NOCTURNAL DRAINAGE OF ENE 20-25 KT WINDS TONIGHT INTO EARLY SUN ACROSS THE PACIFIC WATERS FROM 09.5- 11N BETWEEN 86-88W...WITH SEAS BUILDING TO 8 FT. STRONGER EVENTS ARE FORECAST LATE EACH NIGHT BEGINNING ON SUN NIGHT THROUGH WED NIGHT WITH THE WESTERN EXTENT REACHING AS FAR W AS 10N94W. GULF OF PANAMA...MODERATE TO FRESH NORTHERLY WINDS ARE EXPECTED ACROSS THE GULF OF PANAMA AND DOWNWIND TO ABOUT 06N OVER THE NEXT COUPLE OF DAYS WITH BUILDING SEAS OF 5-7 FT. $$ NELSON