000 AXPZ20 KNHC 132126 TWDEP TROPICAL WEATHER DISCUSSION NWS NATIONAL HURRICANE CENTER MIAMI FL 2205 UTC THU JUN 13 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 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 2100 UTC. ...TROPICAL WAVES... A TROPICAL WAVE EXTENDS ALONG 86W N OF 08N ACROSS WESTERN NICARAGUA AND NE HONDURAS. THE WAVE COINCIDES WITH A MAXIMUM IN DEEP LAYER MOISTURE PRESENT IN TOTAL PRECIPITABLE WATER. THE STRONGEST CONVECTION ASSOCIATED WITH THE WAVE IS NOW ON THE EAST SIDE OF THE WAVE AXIS AND MAINLY OVER THE SW CARIBBEAN AND ALONG THE ATLANTIC COAST OF NICARAGUA. THIS CONVECTIVE ACTIVITY IS LIKELY ENHANCED BY A SURGE OF MOISTURE IN THE TRADE WINDS. AN AREA OF MODERATE TO ISOLATED STRONG CONVECTION IS NOTED NEAR THE SOUTHERN END OF THE WAVE AXIS COVERING FROM 06N TO 08N BETWEEN 86W AND 89W. THE TROPICAL WAVE WILL CONTINUE TO INTERACT WITH THE MONSOON TROUGH...AND MAY HELP TO DEVELOP A 1009 MB SURFACE LOW WITHIN THE MONSOON TROUGH. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... MONSOON TROUGH AXIS ALONG 09N88W TO 13N115W TO 1010 MB LOW PRES NEAR 11N121W TO 11N124W. ITCZ AXIS EXTENDS FROM 11N124W TO 10N130W TO 08N140W. ISOLATED MODERATE WITHIN 145 NM N OF THE MONSOON TROUGH AXIS BETWEEN 90W AND 96W. SCATTERED MODERATE FROM 08N TO 11N BETWEEN 130W AND 134W. SIMILAR CONVECTION IS FROM 12N TO 14N BETWEEN 116W AND 119W AND BETWEEN 126W AND 130W. ...DISCUSSION... SURFACE RIDGING DOMINATES THE NORTH WATERS ANCHORED BY A 1036 MB HIGH NEAR 39N139W. A TIGHTER PRESSURE GRADIENT N OF 30N IS FORCING GALE FORCE WINDS ALONG THE COAST OF NORTH-CENTRAL CALIFORNIA. THIS IS SUPPORTING WINDS OF 20 TO 25 KT AND SEAS TO 10 FT NW OF LINE FROM 30N124W TO 22N140W. WITHIN 24 HOURS... WINDS ARE EXPECTED TO DECREASE TO 20 KT OR LESS AS HIGH PRES WEAKENS WITH SEAS SUBSIDING TO 8 FT IN 48 HOURS. ALOFT...BROAD UPPER TROUGH WITH AXIS ALONG 126W/127W DOMINATES MUCH OF THE N WATERS. AN UPPER ANTICYCLONE REMAINS CENTERED OVER SOUTH-CENTRAL MEXICO AND EXTENDS A RIDGE E-SE ACROSS SE MEXICO INTO HONDURAS AND EL SALVADOR. 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 LOW IS HELPING TO INDUCE CONVECTION OVER NORTHERN MEXICO MAINLY E OF THE SIERRA MADRE MOUNTAINS OR SIERRA MADRE OCCIDENTAL. MODERATE TO STRONG SUBSIDENCE AND IMPLIED DRY AIR MASS IS NOTED N OF 17N W OF 110W. LONG PERIOD CROSS EQUATORIAL SW SWELLS...WITH WAVE PERIOD OF 15- 16 SECONDS CONTINUE TO IMPACT THE ENTIRE COASTLINE. A NEW SW SWELL TRAIN WITH LEADING EDGE PERIOD OF 18-19 SECONDS IS ALREADY AFFECTING THE SOUTH CENTRAL WATERS AND IS FORECAST TO REACH MOST OF THE COAST OF CENTRAL AMERICA AND MEXICO TONIGHT. $$ GR