000 AXPZ20 KNHC 140244 TWDEP TROPICAL WEATHER DISCUSSION NWS NATIONAL HURRICANE CENTER MIAMI FL 0405 UTC FRI JUN 14 2013 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 0230 UTC. ...TROPICAL WAVES... A TROPICAL WAVE EXTENDS FROM 15N86W TO 06N88W. THE WAVE COINCIDES WITH A MAXIMUM IN DEEP LAYER MOISTURE PRESENT IN TOTAL PRECIPITABLE WATER. DURING THE LAST FEW HOURS...CONVECTION ASSOCIATED WITH THE WAVE HAS DIMINISHED OVER THE SW CARIBBEAN AND HAS FLARE UP OVER SOUTHERN HONDURAS AND EL SALVADOR... INCLUDING THE GULF OF FONSECA WHERE SCATTERED TO NUMEROUS SHOWERS AND TSTMS ARE NOTED. SCATTERED TSTMS ARE ALSO DEVELOPING OVER WATERS N OF 11N BETWEEN THE WAVE AXIS AND 90W. A SMALL CLUSTER OF MODERATE TO ISOLATED STRONG CONVECTION IS NOTED WITHIN 90 NM JUST EAST OF THE SOUTHERN END OF THE WAVE AXIS. THE TROPICAL WAVE WILL CONTINUE TO INTERACT WITH THE MONSOON TROUGH...AND WILL MOVE WWD REACHING NEAR 90W FRI NIGHT AND THE TEHUANTEPEC AREA SAT NIGHT. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... MONSOON TROUGH AXIS ALONG 09N90W TO 08N105W TO 11N116W TO A 1010 MB LOW PRES NEAR 11N122W. ITCZ AXIS EXTENDS FROM 11N122W TO 09N140W. ISOLATED MODERATE CONVECTION FROM 09N TO 11N BETWEEN 94W AND 98W. SCATTERED MODERATE CONVECTION NEAR 12N121W AND NEAR 08N127W. ...DISCUSSION... SURFACE RIDGING DOMINATES THE NORTH WATERS ANCHORED BY A 1034 MB HIGH PRES NEAR 38N139W. A TIGHTER PRESSURE GRADIENT N OF 30N IS FORCING NEAR GALE FORCE WINDS ALONG THE COAST OF NORTH-CENTRAL CALIFORNIA. N TO NE SWELLS OF 8 TO 10 FT ASSOCIATED WITH THESE WINDS ARE PROPAGATING ACROSS THE FORECAST WATERS MAINLY NW OF LINE FROM 30N119W TO 26N130W TO 18N140W. SEAS ARE EXPECTED TO SUBSIDE TO 8 FT OR LESS IN ABOUT 48 HOURS AS THE PRES GRADIENT RELAXES. MEANWHILE...WINDS HAVE ALREADY DIMINISHING TO 20 KT OR LESS ACROSS THE NW PART OF THE FORECAST AREA PER THE MOST RECENT OSCAT PASS. A WEAK 1010 MB LOW PRES REMAINS EMBEDDED WITHIN THE MONSOON TROUGH NEAR 11N122W. A SWIRL OF LOW CLOUDS IS NOTED ON NIGHT CHANNEL VISIBLE IMAGES ASSOCIATED WITH THIS LOW. FARTHER WEST...THE SAME OSCAT PASS SUGGESTS THE PRESENCE OF A WEAK TROUGH EXTENDING FROM 13N130W TO 09N133W. SOME SHOWER ACTIVITY IS NEAR THE TROUGH AXIS. ALOFT...BROAD UPPER TROUGH WITH AXIS ALONG 125W/126W DOMINATES MUCH OF THE N WATERS. AN UPPER ANTICYCLONE REMAINS CENTERED OVER CENTRAL MEXICO NEAR 19N101W AND EXTENDS A RIDGE E-SE ACROSS SE MEXICO AND NORTHERN CENTRAL AMERICA. UPPER DIFFLUENCE ASSOCIATED WITH THIS RIDGE IS HELPING TO INDUCE CONVECTION NEAR THE ABOVE MENTIONED TROPICAL WAVE. ANOTHER RIDGE STRETCHES FROM THE SAME ANTICYCLONE TO THE N INTO SOUTHERN TEXAS. ELY WINDS ON THE SOUTHERN PERIPHERY OF THE RIDGE ARE TRANSPORTING ABUNDANT MID TO UPPER LEVEL MOISTURE. AN UPPER LEVEL LOW IS HELPING TO ENHANCE CONVECTION OVER NORTHERN MEXICO MAINLY E OF THE SIERRA MADRE MOUNTAINS. MODERATE TO STRONG SUBSIDENCE AND IMPLIED DRY AIR MASS COVERS THE AREA N OF 17N W OF 110W. LONG PERIOD CROSS EQUATORIAL SW SWELLS...WITH LEADING EDGE PERIOD OF 18-19 SECONDS IS ALREADY AFFECTING THE SOUTH CENTRAL WATERS AND IS FORECAST TO REACH MOST OF THE COASTLINE OF CENTRAL AMERICA AND MEXICO LATER TONIGHT. $$ GR