000 AXPZ20 KNHC 192157 TWDEP TROPICAL WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 2205 UTC FRI MAY 19 2006 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 2145 UTC. ...ITCZ... THE ITCZ AXIS IS CENTERED ALONG 8N78W 8N83W 13N96W 7N109W 9N120W 6N137W. SCATTERED MODERATE ISOLATED STRONG CONVECTION IS NOTED WITHIN 180 NM OF AXIS E OF 130W. SCATTERED MODERATE IS NOTED WITHIN 30 NM OF 7N138W. ...DISCUSSION... A DEEP LAYERED CYCLONE IS N OF DISCUSSION AREA NEAR 40N134W WITH A TROUGH EXTENDING SW TO A BASE NEAR 21N140W. A SURFACE FRONT HAS WEAKENED TO A TROUGH LYING ALONG 32N127W 26N131W AND CONTINUES TO SHIFT E WITH TIME. DRY UPPER AIR IS NOTED WITHIN 150 NM EITHER SIDE OF LINE 30N125W 25N140W. A BROAD UPPER ANTICYCLONE LIES ALONG 11N BETWEEN 125W AND 108W WITH A MEAN CENTER ESTIMATED NEAR 12N122W. AN UPPER RIDGE EXTENDS N THROUGH 26N120W THEN MERGES INTO A LONGWAVE RIDGE DOMINATING WESTERN N AMERICA ROUGHLY ALONG 110W. ASSOCIATED UPPER DIFFLUENCE ALONG THE RIDGE IS ENHANCING ITCZ CONVECTION BETWEEN 141W AND 100W. A PRONOUNCED BAND OF UPPER MOISTURE IS NOTED WITHIN 210 NM EITHER SIDE OF LINE 25N120W 14N140W. ELSEWHERE W OF 100W DEBRIS MOISTURE ORIGINATING FROM THE ENHANCED ITCZ CONVECTION SPREADS NE BUT SEEMS TO EVAPORATE IMMEDIATELY ALONG 12N TO 13N AS VERY DRY UPPER AIR IS INDICATED ELSEWHERE N OF THE ITCZ BETWEEN 123W AND 100W. THE SHORTWAVE RIDGE SEPARATES THE UPPER TROUGH OVER THE W PORTION FROM AN UPPER TROUGH THAT DOMINATES EASTERN N AMERICA AND EXTENDS SW INTO THE DISCUSSION AREA ALONG 32N83W 14N104W. ANOTHER ILL-DEFINED ANTICYCLONE IS ESTIMATED NEAR 12N98W WITH ITS ASSOCIATED UPPER DIFFLUENCE PENANCING THE ITCZ BETWEEN 100W AND 71W. THE RESULTANT DEBRIS MOISTURE IS ADVECTED NE ACROSS ALL OF CENTRAL AMERICA AND ACROSS THE CENTRAL CARIBBEAN. $$ NELSON