000 AXPZ20 KNHC 252142 TWDEP TROPICAL WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 2205 UTC WED AUG 25 2010 TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM THE EQUATOR TO 32N...EAST OF 140W. BASED ON 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 2115 UTC. ...SPECIAL FEATURES... HURRICANE FRANK IS CENTERED NEAR 17.0N 106.3W AT 25/2100 UTC OR 210 NM S OF CABO CORRIENTES MEXICO MOVING WNW AT 11 KT. ESTIMATED MINIMUM CENTRAL PRESSURE IS 987 MB. MAXIMUM SUSTAINED WIND SPEED IS 65 KT WITH GUSTS TO 80 KT. FRANK IS EXPECTED TO TRACK AROUND THE SOUTHERN PERIPHERY OF AN UPPER LEVEL ANTICYCLONIC CIRCULATION CENTERED OVER NORTHWESTERN MEXICO AND THE SW CONUS THE NEXT COUPLE OF DAYS ALL THE WHILE CONTINUING TO MOVE AWAY FROM THE SOUTHWESTERN COAST OF MEXICO. BY LATE FRIDAY...FRANK IS EXPECTED TO TRACK MORE NORTHWARD DUE TO A MID-LATITUDE UPPER LEVEL TROUGH FORECAST TO BEGIN IMPACTING THE U.S. WEST COAST AND BAJA CALIFORNIA. NUMEROUS MODERATE TO STRONG CONVECTION IS WITHIN 120 NM W AND 75 NM E SEMICIRCLES. SCATTERED MODERATE CONVECTION IS ELSEWHERE WITHIN 420 NM SW QUADRANT. SEE LATEST NHC FORECAST/ADVISORY UNDER AWIPS/WMO HEADERS MIATCMEP4/ WTPZ24 KNHC FOR MORE DETAILS. ...ITCZ... THE INTERTROPICAL CONVERGENCE ZONE AXIS IS ANALYZED ALONG 08N80W TO 07N93W TO 14N107W TO 12N119W TO 08N140W. SCATTERED MODERATE CONVECTION IS WITHIN 120 NM S OF THE AXIS BETWEEN 80W AND 85W... WITHIN 90 NM N OF THE AXIS BETWEEN 121W AND 125W...AND WITHIN 150 NM N AND 75 NM S OF THE AXIS W OF 135W. ...DISCUSSION... A BROAD ANTICYCLONIC CIRCULATION IS CENTERED OVER NW MEXICO THAT EXTENDS AN UPPER LEVEL RIDGE OVER THE FORECAST WATERS COVERING THE AREA N OF 14N W OF 100W. A WEAK MIDDLE TO UPPER-LEVEL LOW IS EMBEDDED WITHIN THIS FLOW NEAR 30N120W AND CONTINUES TO MOVE NORTH OF THE DISCUSSION AREA. HURRICANE FRANK IS MOVING AROUND THE SOUTHERN PERIPHERY OF THIS DEEP-LAYER RIDGE AND IS EXPECTED TO CONTINUE TRACKING W-NW THROUGH THE FORECAST PERIOD. SATELLITE WATER VAPOR IMAGERY SHOWS MOSTLY MODERATE SUBSIDENCE AND DRY AIR PRESENT OVER A LARGE PORTION OF THE AREA OUTSIDE THE ITCZ REGION N OF 15N W OF 120W. AT THE SURFACE...A RIDGE IMPACTS THE REGION N OF 18N W OF 120W. A PAIR OF 1010 MB WEAK LOWS ARE EMBEDDED WITHIN THE ITCZ. THE FIRST LOW IS CENTERED NEAR 13N117W AND REMAINS NEARLY STATIONARY. AN AFTERNOON ASCAT PASS FROM 25/1716 UTC DEPICTED S TO SW WINDS 20 KT OVER A LARGE AREA S OF THE LOW COVERING THE AREA FROM 03N TO 11N BETWEEN 114W AND 130W. THE SECOND LOW IS NEAR 11N133W AND IS FORECAST TO WEAKEN OVER THE NEXT 24 HOURS. BETWEEN THE LOW CENTERS...A SURFACE TROUGH IS ANALYZED FROM 12N127W TO 17N124W. WHILE VERY LITTLE CONVECTION IS NOTED ALONG THE SURFACE TROUGH...SCATTERED MODERATE CONVECTION IS WITHIN 180 NM OF THE CENTER OF BOTH LOW PRESSURE SYSTEMS. ASIDE FROM WAVES GENERATED IN THE VICINITY OF HURRICANE FRANK... CROSS EQUATORIAL S AND SW SWELLS WITH PEAK WAVE PERIODS OF 14-16 SECONDS CONTINUE TO BUILD SEAS TO THE 8-11 FT RANGE OVER MUCH OF THE AREA S OF 22N...BETWEEN 80W AND A LINE FROM 21N105W TO 03N140W. THIS AREA OF SEAS OVER 8 FT WILL GRADUALLY SHRINK OVER THE NEXT COUPLE OF DAYS AS PERIODS SHORTEN BELOW 14 SECONDS. $$ HUFFMAN