000 AXPZ20 KNHC 082111 TWDEP TROPICAL WEATHER DISCUSSION NWS NATIONAL HURRICANE CENTER MIAMI FL 2205 UTC FRI JUL 08 2011 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. ...SPECIAL FEATURE... TROPICAL STORM CALVIN HAS BEEN UPGRADED TO HURRICANE CALVIN AT 2100 UTC. CALVIN WAS LOCATED NEAR 16.3N 108.5W AT 08/2100 UTC MOVING W OR 275 DEGREES AT 11 KT. MAXIMUM SUSTAINED WINDS HAVE INCREASED TO 65 KT WITH GUSTS TO 80 KT. ESTIMATED MINIMUM CENTRAL PRESSURE IS 987 MB. SEE LATEST NHC FORECAST/ADVISORY UNDER AWIPS/WMO HEADERS MIATCMEP3/WTPZ23 KNHC FOR MORE DETAILS. NUMEROUS MODERATE TO STRONG CONVECTION IS LOCATED WITHIN 150 NM OF THE CENTER. ...ITCZ/MONSOON TROUGH... MONSOON TROUGH AXIS FROM 08N84W TO 13N100W WHERE IT BREAKS THEN IT RESUMES AT 10N108W TO 07N116W THEN ITCZ TO 09N128W TO BEYOND 08N140W. SCATTERED MODERATE ISOLATED STRONG WITHIN 300 NM S OF MONSOON TROUGH AXIS BETWEEN 92W AND 100W. IS WITHIN 90 NM EITHER SIDE OF THE MONSOON TROUGH FROM 87W TO 93W. SCATTERED MODERATE WITHIN 120 NM N AND 75 NM S OF ITCZ AXIS BETWEEN 127W AND 134W. ...DISCUSSION... PRESSURE GRADIENT BETWEEN HIGH PRES CENTERED NW OF THE AREA NEAR 38N148W AND LOWER PRES ASSOCIATED WITH THE ITCZ IS SUPPORTING FRESH TO STRONG NE WINDS OVER THE EXTREME NW PORTION AREA NW OF A LINE FROM 30N130W TO 23N140W. AN EARLIER ASCAT PASS ALONG WITH FEW SHIP OBSERVATIONS VERIFIED THESE WIND SPEEDS. WINDS ARE FORECAST TO DIMINISH BELOW 20 KT BY SAT AFTERNOON...WITH SEAS REMAINING ABOVE 8 FT IN NE AND SW SWELL...AS THE HIGH PRES SHIFTS WESTWARD AND MERGES WITH HIGH PRES CENTERED NEAR 38W158W BECOMES DOMINANT. CROSS-EQUATORIAL SW SWELLS WILL PREVAIL OVER THE DEEP TROPICS S OF 10N BETWEEN 95W AND 135W THROUGH THE WEEKEND. WAVE HEIGHTS ARE EXPECTED TO REACH 11 FT AS THE SWELLS CONTINUE TO PROPAGATE INTO THE AREA FROM THE SOUTHERN HEMISPHERE. $$ AL 000 AXPZ20 KNHC 082111 TWDEP TROPICAL WEATHER DISCUSSION NWS NATIONAL HURRICANE CENTER MIAMI FL 2205 UTC FRI JUL 08 2011 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. ...SPECIAL FEATURE... TROPICAL STORM CALVIN HAS BEEN UPGRADED TO HURRICANE CALVIN AT 2100 UTC. CALVIN WAS LOCATED NEAR 16.3N 108.5W AT 08/2100 UTC MOVING W OR 275 DEGREES AT 11 KT. MAXIMUM SUSTAINED WINDS HAVE INCREASED TO 65 KT WITH GUSTS TO 80 KT. ESTIMATED MINIMUM CENTRAL PRESSURE IS 987 MB. SEE LATEST NHC FORECAST/ADVISORY UNDER AWIPS/WMO HEADERS MIATCMEP3/WTPZ23 KNHC FOR MORE DETAILS. NUMEROUS MODERATE TO STRONG CONVECTION IS LOCATED WITHIN 150 NM OF THE CENTER. ...ITCZ/MONSOON TROUGH... MONSOON TROUGH AXIS FROM 08N84W TO 13N100W WHERE IT BREAKS THEN IT RESUMES AT 10N108W TO 07N116W THEN ITCZ TO 09N128W TO BEYOND 08N140W. SCATTERED MODERATE ISOLATED STRONG WITHIN 300 NM S OF MONSOON TROUGH AXIS BETWEEN 92W AND 100W. IS WITHIN 90 NM EITHER SIDE OF THE MONSOON TROUGH FROM 87W TO 93W. SCATTERED MODERATE WITHIN 120 NM N AND 75 NM S OF ITCZ AXIS BETWEEN 127W AND 134W. ...DISCUSSION... PRESSURE GRADIENT BETWEEN HIGH PRES CENTERED NW OF THE AREA NEAR 38N148W AND LOWER PRES ASSOCIATED WITH THE ITCZ IS SUPPORTING FRESH TO STRONG NE WINDS OVER THE EXTREME NW PORTION AREA NW OF A LINE FROM 30N130W TO 23N140W. AN EARLIER ASCAT PASS ALONG WITH FEW SHIP OBSERVATIONS VERIFIED THESE WIND SPEEDS. WINDS ARE FORECAST TO DIMINISH BELOW 20 KT BY SAT AFTERNOON...WITH SEAS REMAINING ABOVE 8 FT IN NE AND SW SWELL...AS THE HIGH PRES SHIFTS WESTWARD AND MERGES WITH HIGH PRES CENTERED NEAR 38W158W BECOMES DOMINANT. CROSS-EQUATORIAL SW SWELLS WILL PREVAIL OVER THE DEEP TROPICS S OF 10N BETWEEN 95W AND 135W THROUGH THE WEEKEND. WAVE HEIGHTS ARE EXPECTED TO REACH 11 FT AS THE SWELLS CONTINUE TO PROPAGATE INTO THE AREA FROM THE SOUTHERN HEMISPHERE. $$ AL