000 AXPZ20 KNHC 210920 TWDEP TROPICAL WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 1005 UTC WED NOV 21 2007 TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM THE EQUATOR TO 32N...EAST OF 140W. BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 0900 UTC. ...TROPICAL WAVES... TROPICAL WAVE ALONG 96W N OF 10N MOVING W 10 KT. NO SIGNIFICANT CONVECTION. TROPICAL WAVE ALONG 83W N OF 7N MOVING W 10 KT. SCATTERED MODERATE CONVECTION ALONG BOTH COASTS OF PANAMA AND COSTA RICA E OF 87W. ...ITCZ... ITCZ AXIS ALONG 9N84W 7N123W 10N140W. SCATTERED MODERATE CONVECTION WITHIN 60 NM OF AXIS E OF 87W. ...DISCUSSION... OMEGA TYPE BLOCKING PATTERN IN PLACE WITH TWO WELL DEFINED CYCLONIC CIRCULATIONS AFFECTING THE AREA AND A RIDGE IN BETWEEN. THE FIRST CYCLONIC CIRCULATION IS LOCATED W OF THE AREA NEAR 27N146W LIFTING NWD AS DRY AIR WRAPS AROUND THE BASE OF THE CIRCULATION. AN UPPER LEVEL RIDGE AXIS IS ALONG 133W. STRONGLY DIFFLUENT FLOW IS PRESENT BETWEEN THE RIDGE AND THE CYCLONIC CIRCULATION...MAINLY W OF 130W. THIS FLOW IS PRODUCING A VAST AREA OF BROKEN TO OVERCAST MID AND HIGH CLOUDS IN THE AREA. FURTHER E...A CUT OFF LOW OVER NRN MEXICO IS FINALLY MOVING NE OUT OF THE PICTURE. ANOTHER CYCLONIC CIRCULATION OFF THE SRN CALIFORNIA COAST IS POISED TO TAKE ITS PLACE AND DEEPEN NEAR BAJA CALIFORNIA IN FAVORABLE POSITION OF THE EASTERN QUADRANT OF OMEGA BLOCK. TWO PLUMES OF MOISTURE ARE OBSERVED ON WATER VAPOR IMAGERY...AHEAD OF THE LOW OFF SO-CAL OVER NRN BAJA CALIFORNIA INTO NRN MEXICO...AND FURTHER S ACROSS CENTRAL MEXICO. SATELLITE DERIVED WINDS INDICATE CORE SPEEDS IN THE SRN BRANCH OF 60-80 KT. AT THE SURFACE...WEAK RIDGE IS NORTH OF THE ITCZ WEST OF 110W. A WEAKENING FRONTAL BOUNDARY NW OF THE DISCUSSION WILL CONTINUE TO DISSIPATE IN THE FACE OF THE BLOCKING RIDGE. QUIKSCAT ONCE AGAIN MISSED THE GULF OF TEHUANTEPEC...BUT DID SHOW A SLIGHT INCREASE IN WINDS IN THE GULF OF PAPAGAYO. BOTH GAP WIND FEATURES ARE EXPECTED TO WEAKEN OVER THE NEXT 24 HOURS. $$ MUNDELL