000 AXPZ20 KNHC 190324 TWDEP TROPICAL WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 0405 UTC THU APR 19 2007 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... AXIS 5N77W 9N105W 4N120W 3N140W. SCATTERED MODERATE ISOLATED STRONG CONVECTION INTENSIFYING WITHIN 240 NM OF AXIS BETWEEN 80W AND 94W AND ALSO WEAKENING WITHIN 30 NM OF 11N105W. ...DISCUSSION... AN UPPER SHORTWAVE TROUGH EXTENDS ALONG 32N109W 27N130W TO BEYOND 26N140W WITH THIN BAND OF DRY AIR NOTED WITHIN 45 NM N OF THE TROUGH. AN UPPER CYCLONE FILLED NEAR 24N123W BUT AN UPPER TROUGH STILL EXTENDS S TO A BASE AT 17N119W. AN UPPER RIDGE EXTENDS NE ACROSS THE EQUATOR CRESTING ALONG POINTS 21N140W 16N125W 1N114W...WITH ITS UPPER DIFFLUENCE ENHANCING CONVECTION ALONG THE ITCZ W OF 114W. SOME OF THE RESULTANT DEBRIS MOISTURE IS ADVECTED S OF THE EQUATOR BUT SOME OF THE MOISTURE ALSO SPREADS NE. SOME NEW MOISTURE IS MOVING ACROSS THE TOP OF THE RIDGE INTO THE DISCUSSION AREA FROM 13N TO 21N W OF 128W. AN UPPER ANTICYCLONE IS ESTIMATED NEAR 9N75W WITH A RIDGE EXTENDING NW CRESTING ALONG POINTS 15N116W 29N113W 34N101W 30N88W. ASSOCIATED UPPER DIFFLUENCE ENHANCED ITCZ CONVECTION EARLIER NEAR 10N100W AND IS INCREASING CONVECTION ALONG THE ITCZ NEAR 90W AS DESCRIBED ABOVE. THE RESULTANT DEBRIS MOISTURE FROM THIS CONVECTION MERGES WITH MOISTURE FROM CONVECTION W OF 120W...AND TOGETHER THE MOISTURE IS ADVECTED NE UNDER THE UPPER RIDGE INTO A MOISTURE PLUME THAT TURNS EASTWARD ACROSS MOST OF OLD MEXICO AND THE W GULF OF MEXICO. OTHERWISE DRY UPPER AIR IS NOTED OVER THE W PORTION OF THE DISCUSSION AREA...ROUGHLY N OF 16N W OF 120W AND N OF THE ITCZ TO THE E OF 98W. AT THE BROAD HIGH PRES DOMINATES THE DISCUSSION AREA N OF THE ITCZ W OF 105W. THE ITCZ IS STRETCHED N TO 9N AT 105W. $$ NELSON