000 AXPZ20 KNHC 040334 TWDEP TROPICAL WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 0405 UTC TUE APR 04 2006 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 0315 UTC. ...ITCZ... ITCZ AXIS ALONG 5N77W 6N115W 7N130W 7N140W. SCATTERED MODERATE ISOLATED STRONG CONVECTION WITHIN 60 NM EITHER SIDE OF AXIS FROM 87W TO 96W AND WITHIN 90 NM EITHER SIDE OF LINE 4N109W 8N124W 8N135W. ...DISCUSSION... THE NE PAC IS DOMINATED BY A LONGWAVE TROUGH WITH AN EMBEDDED DEEP LAYERED CYCLONE NEAR 36N132W NOW SHIFTING ENE WITH TIME. AN UPPER CUTOFF CYCLONE IS NEAR THE BASE OF THE LONGWAVE TROUGH NEAR 2N118W. AN UPPER ANTICYCLONE IS NEAR 8N88W WITH A RIDGE EXTENDING N ALONG 22N106W AND CRESTING OVER THE CONUS ALONG POINTS 35N118W 42N112W 35N90W. TO THE E OF THE RIDGE ANOTHER SHORTWAVE TROUGH EXTENDS S ALONG 32N85W TO 21N93W. A BROAD LOW TO MID LEVEL TROUGH IS NOTED FROM 3N137W TO 13N133W. UPPER DIFFLUENCE IS ENHANCING CONVECTION ALONG THIS TROUGH AND ALONG THE ITCZ W OF 110W...AND BETWEEN 86W AND 97W. DEBRIS MOISTURE FROM THIS CONVECTION IS ADVECTED NE ACROSS OLD MEXICO BETWEEN 90W AND 106W BUT EVAPORATES IN VERY DRY UPPER AIR THAT ACCOMPANIES THE GULF OF MEXICO SHORTWAVE. A MORE SIGNIFICANT MOISTURE PLUME ENTERS THE DISCUSSION AREA WITHIN 360 NM EITHER SIDE OF LINE 10N140W THEN NARROWS TO WITHIN 240 NM EITHER SIDE OF POINTS 23N127W TO BEYOND 32N115W. OTHERWISE DRY UPPER AIR DOMINATES THE DISCUSSION AREA S OF 26N E OF 106W. AT THE SURFACE...HIGH PRES 1020 MB NEAR 25N120W. THIS HIGH WILL DISSIPATE BRIEFLY ALLOWING A SURFACE COLD FRONT TO MOVE THROUGH THE SUBTROPICS ACCOMPANIED BY LARGE NW SWELLS. GULF OF PAPAGAYO...LATEST SSMI DATA INDICATE NE WINDS 20 KT WITHIN 60 NM EITHER SIDE LINE 9N92W 12N87W. THESE GAP WINDS ARE EXPECTED TO FLUCTUATE TO 20 KT THROUGH 48 HOURS. $$ NELSON