000 AXPZ20 KNHC 012154 TWDEP TROPICAL WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 2205 UTC SAT MAR 01 2008 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 2145 UTC. ...ITCZ... ITCZ ALONG 8N83W 7N87W 9N115W 7N135W 7N140W. SCATTERED MODERATE ISOLATED STRONG WITHIN 90 NM OF 3N79W AND FROM 2S TO 3S BETWEEN 95W AND 103W AND FROM 4N TO 12N BETWEEN 107W AND 123W. ...DISCUSSION... AN UPPER ANTICYCLONE IS NEAR 3N143W WITH RIDGE N ALONG 14N141W CRESTING NEAR 35N142W. UPPER MOISTURE IS OBSERVED W OF THE RIDGE AXIS AND IS JUST BEGINNING TO FLOW ACROSS THE RIDGE. A SECOND UPPER ANTICYCLONE IS NEAR 10N104W WITH A RIDGE N ALONG 11N105W CRESTING OVER OLD MEXICO AT 25N106W. UPPER DIFFLUENCE IS ENHANCING ITCZ CONVECTION BETWEEN 104W AND 122W...WITH THE RESULTANT DEBRIS MOISTURE SPREADING N ALONG THE W PERIPHERY OF THE RIDGE WITH SOME SPILLING E ACROSS CENTRAL OLD MEXICO NEAR 21N102W AS THIN BROKEN CIRRUS. A THIRD UPPER ANTICYCLONE IS ESTIMATED NEAR THE EQUATOR AT 89W AND A FOURTH IS WELL E OF THE AREA NEAR 5N58W. MID TO UPPER RIDGES EXTEND W ACROSS THE DISCUSSION AREA RESULTING IN BROAD ANTICYCLONIC FLOW AND UPPER DRY AIR S OF 22N E OF 100W. BETWEEN THE UPPER RIDGES DESCRIBED ABOVE LIES AN UPPER TROUGH 32N114W 22N122W 11N125W ACCOMPANIED BY DRY UPPER AIR N OF 10N BETWEEN 137W AND 119W. AT THE SURFACE HIGH PRES CENTERED AT 31N134W 1025 MB WITH A RIDGE E TO NEAR 12N110W. THE HIGH IS BLOCKING A WEAK COLD FRONT ALONG 32N136W 29N144W. THE FRONT SHOULD DISSIPATE SUN WITH A STRONGER RIDGE BUILDING IN FROM THE NW. GAP WINDS...E 20-25 KT WINDS IN AND DOWNSTREAM THE GULF OF PAPAGAYO WILL GRADUALLY DIMINISH TO ABOUT 20 KT IN 48 HOURS. NORTHERLY WINDS TO 20 KT IN AND DOWNSTREAM OF THE GULF OF PANAMA WINDS WILL DIMINISH EARLY SUN TO LESS THAN 20 KT. NORTHERLY WINDS IN THE GULF OF TEHUANTEPEC EXPECTED TO SURGE AT 20 TO 25 KT JUST AFTER SUNRISE SUN THEN DIMINISH. $$ NELSON