000 AXPZ20 KNHC 301548 TWDEP TROPICAL WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 1605 UTC WED DEC 30 2009 TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM THE EQUATOR TO 32N...EAST OF 140W. BASED ON 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 1545 UTC. ...ITCZ... THE INTERTROPICAL CONVERGENCE ZONE FLUCTUATES FROM 04N TO 07N TO THE E OF 140W. SCATTERED MODERATE ISOLATED STRONG CONVECTION IS NOTED WITHIN 60 NM EITHER SIDE OF A LINE FROM 06N77W TO 02N85W. SCATTERED MODERATE CONVECTION IS OBSERVED FROM 07N TO 10N BETWEEN 95W AND 101W. ...DISCUSSION... A SHORTWAVE RIDGE EXTENDS OVER THE EXTREME NW CORNER OF THE DISCUSSION OF THE AREA ACCOMPANIED BY MOISTURE OVER THE AREA N OF 26N W OF 135W. A MID TO UPPER TROUGH EXTENDS INTO THE AREA ALONG 32N107W TO 23N125W TO 14N137W ACCOMPANIED BY DRY UPPER AIR WITHIN 360 NM EITHER SIDE OF THE AXIS. AN UPPER RIDGE ORIGINATING OVER S AMERICA RIDGES NW OVER CENTRAL AMERICA. UPPER MOISTURE ORIGINATING FROM ITCZ CONVECTION BETWEEN 115W AND 135W IS ADVECTED NE ALONG THE PERIPHERY OF THIS RIDGE WITHIN 240 NM OF LINE 10N120W TO 25N90W. AN UPPER CYCLONE IS NEAR 09N103W WITH CONVECTION ENHANCED OVER ITS NE SEMICIRCLE. THE DEBRIS MOISTURE QUICKLY EVAPORATES. AT THE LOW LEVELS HIGH PRESSURE IS CENTERED NEAR 29N127W WITH A CENTRAL PRESSURE OF 1027 MB. THE ASSOCIATED RIDGE COVERS THE AREA N OF 12N W OF 110W. GAP WINDS... GULF OF TEHUANTEPEC...N WINDS OF 20 TO 30 KT ARE FORECAST TO DIMINISH TONIGHT TO 20 TO 25 KT THEN FURTHER DIMINISH TO LESS THAN 20 KT THU NIGHT. GULF OF PAPAGAYO...E WINDS OF 20 TO 25 KT ARE EXPECTED TO CONTINUE THROUGH THU NIGHT. GULF OF CALIFORNIA...NW WINDS ARE EXPECTED TO INCREASE TO 15 TO 20 KT OVER THE SOUTHERN GULF WATERS THU NIGHT SPREADING N TO INCLUDE THE ENTIRE GULF FRI. SEA CONDITIONS ARE DOMINATED BY LONG PERIOD NW SWELL (WAVE PERIODS OF UP TO 16 SECONDS) WITH SIGNIFICANT WAVE HEIGHTS AS HIGH AS 12 FT. FOR ADDITIONAL INFORMATION PLEASE VISIT HTTP://WWW.HURRICANES.GOV/MARINE $$ NELSON