000
AXPZ20 KNHC 260331
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC TUE MAY 26 2009

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 
0345 UTC.

...TROPICAL WAVES...
TROPICAL WAVE ALONG 106W FROM 02N TO 14N MOVING W AT 15 KT. 
WHILE THE UPPER LEVEL ENVIRONMENT IS NOT COMPLETELY FAVORABLE TO 
DEVELOPMENT...IT HAS BECOME LESS ADVERSE AND ALLOWED SCATTERED 
CONVECTION WITHIN180 NM W OF AXIS N OF ITCZ.  AIR MASS IS VERY 
DRY S OF ITCZ.  FURTHER W DRIFT BRING WAVE INTO ENVIRONMENT MORE 
FAVORABLE FOR CONVECTION.

...ITCZ...
AXIS ALONG 06N77W TO 09N98W TO 08N113W TO 10N125W TO 06N140W.  
SCATTERED MODERATE ISOLATED STRONG CONVECTION WITHIN 240 NM OF 
AXIS FROM 85W-93W.  SCATTERED MODERATE CONVECTION WITHIN 75 NM 
OF AXIS W OF 124W.

.DISCUSSION...
UPPER LEVEL TROUGH EXTENDS SW ALONG 32N111W TO 18N130W BARELY 
NOTICEABLE IN QUASI-ZONAL FLOW THAT CONTINUES N OF 17N W OF 97W. 
MOISTURE HAS NOW ENCROACHED INTO E PAC FROM SEVERAL SOURCES WITH 
PATCHES OF DRY AIR MASS NOW LOSING COVERAGE.  JET CORE 80 KT 
ADVECTS PLENTY OF MOISTURE ALONG 26N WHILE RIDGE ALONG 09N-12N 
MAINTAINS MOISTURE DEBRIS FROM ITCZ CONVECTION FLOWING EASTWARD 
S OF 17N INTO CENTRAL AND SOUTH AMERICA BESIDES INTO WESTERN 
CARIBBEAN.

UPPER LEVEL ANTICYCLONE OVER GULF OF PANAMA HAS RIDGE EXTEND W 
ALONG 09N-12N PROVIDING GOOD OUTFLOW TO SURFACE EQUATORIAL 
TROUGH CONVECTION AND ITCZ TO 97W.

.ELSEWHERE AT THE SURFACE...
WEAKENING HIGH PRES CENTER 1025 MB N OF AREA DRIFTING S WILL 
EFFECTIVELY HELP CLOSE DOWN NE TRADE WINDS WITHIN 24 HRS.  SMALL 
AREA OF N SWELLS TO 8-10 FT EXPECTED TO CONTINUE OVER DISCUSSION 
AREA N OF 28N FROM 120W TO 125 THROUGH WED.  

$$
WALLY BARNES