000 AXPZ20 KNHC 250956 TWDEP TROPICAL WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 1005 UTC SUN APR 25 2010 TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM THE EQUATOR TO 32N...EAST OF 140W. BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 0915 UTC. ...ITCZ... AXIS ALONG 04N78W TO 04N85W TO 08N106W TO 08N125W TO 07N140W. ISOLATED MODERATE CONVECTION WITHIN 240 NM S OF AXIS FROM 92W TO 106W. ...DISCUSSION... SHARP UPPER LEVEL TROUGH JUST ENTERED NW CORNER OF E PAC BRINGING SOME DRY AIR MASS NW OF CURRENT 115 KT JETSTREAM TRAPPED BETWEEN TROUGH AND BROAD MID/UPPER LEVEL RIDGE CENTERED AT 12N112W. ANTICYCLONIC FLOW BRING LARGE AMOUNTS OF MOISTURE...MAINLY TROPICAL CONVECTIVE DEBRIS FROM ITCZ...TOWARDS BAJA CALIFORNIA AND MEXICO WHERE DRYNESS STILL DOMINATES REGION. MOST MOISTURE STILL W OF 118W AS DOWNSTREAM UPPER LEVEL TROUGH ACROSS CENTRAL MEXICO HAS NOT EXITED EAST. ONLY OTHER FEATURE IS SMALLER MID/UPPER LEVEL RIDGE OVER EASTERN HONDURAS. THIS IS THE RIDGE THAT HAS BEEN FUELING ENORMOUS AMOUNTS OF MID LEVEL MOISTURE TO PROMPT VERY DEEP CONVECTION ACROSS GULF STATES. THIS RIDGE ALSO PRODUCING AREA OF DIFFLUENT FLOW OVER OTHERWISE WEAK SURFACE TROUGH EMBEDDED IN EASTERN PART OF ITCZ. DIFFLUENCE DIMINISHES THROUGH TUE AND DEEP CONVECTION SUBSIDES AS IT TRAVELS WEST AWAY FROM RIDGE INFLUENCE ALOFT. STILL PLENTY OF MOISTURE REMAINS IN AREA AND GOOD VORTICITY SO CONVECTION IS LIKELY POP UP AGAIN THROUGH FORECAST PERIOD. ELSEWHERE AT THE SURFACE... SURFACE TROUGH WITH PLENTY OF DEEP CONVECTION OFF COAST OF COSTA RICA ENHANCED BY UPPER LEVEL FAVORABLE ENVIRONMENT WEAKENS THROUGH TUE SHUTTING DOWN MODERATE TO FRESH SW WIND. HIGH PRES CENTER 1032 MB AT 37N132W QUICKLY WEAKENS AND DRIFT S RELAXING GRADIENT AND EFFECTIVELY SHUTTING DOWN PRESENT FRESH NE TRADES W OF 130W WITHIN 48 HRS. LARGE LONG PERIOD NW SWELLS SPREAD THROUGH BASIN THROUGHOUT FORECAST PERIOD. MINOR AREA ALSO COVERED BY CROSS EQUATORIAL 8 FT SW SWELLS. $$ WALLY BARNES