000 AXPZ20 KNHC 222204 TWDEP TROPICAL WEATHER DISCUSSION NWS NATIONAL HURRICANE CENTER MIAMI FL 2205 UTC FRI APR 22 2011 TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM THE EQUATOR TO 32N...EAST OF 140W. BASED ON 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 2115 UTC. ...ITCZ... AXIS IS CENTERED ALONG 5N77W TO 6N90W TO LOW NEAR 8N96W 1008 MB TO 5N111W TO 4N120W TO 5N130W 3N140W. SCATTERED MODERATE CONVECTION IS WITHIN 60-90 NM OF THE AXIS BETWEEN 107W-118W...AND WITHIN 60 NM OF THE AXIS BETWEEN 118W-122W. ...DISCUSSION... AT UPPER LEVELS...BROAD RIDGING COVERS MOST OF THE AREA WITH THE ASSOCIATED UPPER ANTICYCLONE NEAR 14N109W...AND HAS EXPANDED N AND NE DURING THE PAST 24 HOURS AND NOW COVERS MOST OF THE AREA N OF THE ITCZ BETWEEN 105W AND 135W. THIS RIDGING HAS OCCURRED IN LARGE PART DUE TO A SHORTWAVE MOVING EWD THROUGH THE NW PORTIONS OF THE AREA AND BROAD TROUGHING ACROSS THE WRN U.S. YESTERDAY SHIFTING E INTO TEXAS ALLOWING THE RIDGE TO AMPLIFY NWD IN BETWEEN THESE TWO TROUGHS. S TO SW FLOW ALOFT THUS PREVAILS FROM 07N TO 25N BETWEEN 125W AND 140W. S OF THE ITCZ...A PERSISTENT EQUATORIAL UPPER CYCLONE WAS NOTED NEAR 1N122W AND WAS BECOMING MORE ELONGATED W TO E. ACTIVE DEEP CONVECTION CONTINUES NEAR THE ITCZ BETWEEN THIS UPPER CYCLONE AND THE UPPER ANTICYCLONE HELPING TO MAINTAIN DIFFLUENT FLOW ALOFT. AT LOWER LEVELS...HIGH PRES AND ANTICYCLONIC FLOW DOMINATES MUCH OF THE AREA N OF THE ITCZ AND W OF 106W WITH THE ASSOCIATED HIGH CENTER OF 1023 MB NEAR 27N133W. A RIDGE EXTENDS SE FROM THIS HIGH SE TO 19N118W TO NEAR 15N109W. THE PRES GRADIENT BETWEEN THE RIDGE AND A TROUGH OF LOW PRESSURE OVER MEXICO IS SUPPORTING NW WINDS OF 20 KT N OF 24N E OF 119W TO THE W COAST OF BAJA CALIFORNIA. AN ASCAT PASS FROM 1750 UTC PARTIALLY CAPTURED THESE WINDS. THE PRES GRADIENT BETWEEN THE RIDGE AND LOWER PRESSURE IN THE VICINITY OF THE ITCZ IS SUPPORTING NE TO E 20 KT TRADES FROM 6N TO 17N W 0F 132W...AND ALSO FROM 8N TO 15N BETWEEN 125W-132W. THE HIGH WILL REORGANIZE OVER THE NEXT 24 HOURS AS A SHORTWAVE AND ITS ASSOCIATED COLD FRONT SWEEP EWD AND OVER THE RIDGE. THIS WILL SHIFT THE FRESH TRADEWINDS SLIGHTLY WWD BEFORE REBUILDING SAT NIGHT AND SUN. FRESH NWLY WINDS OFF OF BAJA WILL DIMINISH IN AREAL COVERAGE DURING THE NEXT 48 HOURS. A PLUME OF ABUNDANT TROPICAL MOISTURE CONTINUES TO SPREAD FRO THE ITCZ NEAR 100W...NE INTO EXTREME SE MEXICO AND GUATEMALA THIS MORNING. ACTIVE DIURNAL CONVECTION SHOULD BE EXPECTED THIS AFTERNOON AND EVENING FROM CHIAPAS MEXICO E AND NE TO BELIZE AND HONDURAS. VERY LONG PERIOD CROSS-EQUATORIAL SW SWELL HAS REACHED THE PACIFIC COASTS FROM COLOMBIA TO SRN CALIFORNIA OVERNIGHT AND WILL BUILD TO 3 TO 6 FT DURING THE NEXT 24 TO 36 HOURS. THIS SHOULD RESULT IN HIGH SURF CONDITIONS ALONG EXPOSED COASTLINES THROUGH SUN. $$ AGUIRRE