000 AXPZ20 KNHC 190252 TWDEP TROPICAL WEATHER DISCUSSION NWS NATIONAL HURRICANE CENTER MIAMI FL 0405 UTC TUE APR 19 2011 TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM THE EQUATOR TO 32N...EAST OF 140W. BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 0230 UTC. ...ITCZ... AXIS EXTENDS FROM 05N77W TO 03N86W TO 05N92W TO 04N98W TO 05N104W TO 02N119W TO 03N134W TO 05N140W. A SURFACE TROUGH IS EMBEDDED WITHIN THE ITCZ FROM 08N93W TO 02N96W AND A SECOND FROM 09N127W TO 03N129W. SCATTERED MODERATE CONVECTION FROM 03N TO 05N BETWEEN 92W AND 95W. ...DISCUSSION... A 1021 MB HIGH PRES NEAR 30N134W EXTENDS A BROAD RIDGE AXIS ACROSS NW PORTION OF DISCUSSION AREA TO AROUND 17N115W. PRES GRADIENTS ON SOUTHERN AND EASTERN PERIPHERY ARE FAIRLY WEAK AND AS A RESULT WINDS ACROSS ENTIRE NE PACIFIC BASIN ARE LESS THAN 20 KT. ONLY REMAINING AREA OF MODERATE 10-15 KT WINDS ARE W OF BAJA CALIFORNIA TO 120W AND IN THE TRADE WIND BELT BETWEEN 5N AND 15N W OF 130W. AS A CONSEQUENCE OF THE LIGHT WINDS SEA HEIGHTS CONTINUE TO SUBSIDE...AND ARE GENERALLY 5-7 FT. LOOKING AHEAD...MODEL GUIDANCE SUGGESTS VERY LITTLE CHANGE TO THE CURRENT DOWNWARD TREND IN WINDS AND SEAS. THE HIGH WILL GRADUALLY SHIFT S AND E OVER THE NEXT DAY OR TWO THROUGH EARLY WED. A WEAK FRONTAL BOUNDARY WILL MOVE INTO THE NW PORTION WED THROUGH EARLY THU BEFORE DISSIPATING N OF THE REGION. A THERMAL TROUGH OVER THE MOJAVE DESERT IN THE SW U.S. TIGHTENS THE PRES GRADIENT ENOUGH TO SUPPORT 20 KT WINDS THU THROUGH SAT WITHIN 150 NM W OF THE BAJA PENINSULA...BUT OTHERWISE BENIGN MARINE CONDITIONS ARE EXPECTED TO PREVAIL OVER THE EASTERN PACIFIC THROUGH SAT. SWELLS FROM THE S PACIFIC WILL MOVE ACROSS THE EQUATOR EARLY THU BETWEEN 100W AND 125W THEN SHIFT EASTWARD THROUGH SAT. VERY LONG PERIOD 19-20 SEC CROSS-EQUATORIAL SW SWELL WILL SWEEP NE LATE TUE THROUGH SAT...REACHING THE COASTS OF MEXICO AND CENTRAL AMERICA EARLY THU. SEA HEIGHTS WILL BE LESS THAN 8 FT BUT HIGH ENERGY SWELL WILL RESULT IN HAZARDOUS SURF AT COASTAL LOCATIONS. $$ PAW