000
AXPZ20 KNHC 090347
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC SAT MAY 09 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 
0300 UTC.

...ITCZ...

THE INTERTROPICAL CONVERGENCE ZONE IS ALONG THE LINE...07N77W TO 
07N105W TO 05N140W. SCATTERED MODERATE WITH ISOLATED STRONG 
CONVECTION IS WITHIN 100 NM OF THE POINT 06N89W. SCATTERED 
MODERATE WITH ISOLATED STRONG CONVECTION IS WITHIN 60 NM EITHER 
SIDE OF THE ITCZ AXIS W OF 135W. 

...DISCUSSION...

OVERALL A LARGE SCALE RIDGE IS OVER THE AREA HOWEVER THE RIDGE 
IS RATHER FLAT WITH A LARGE CYCLONIC CIRCULATION EMBEDDED WITHIN 
THE RIDGE. THE CYCLONIC CIRCULATION IS CENTERED NEAR 20N118W AND 
IT IS DRIFTING WEST. THE AREA SOUTHEAST OF A LINE FROM THE 
COAST OF MEXICO NEAR 23N TO 10N120W TO THE ITCZ NEAR 130W IS IN 
SOUTHWESTERLY FLOW IN THE MIDDLE AND UPPER LEVELS WITH AREAS OF 
MULTI-LEVEL CLOUDS AND SEVERAL MOSTLY SMALL AREAS OF CONVECTION. 
SOME OF THIS MOISTURE AND CLOUDINESS IS MOVING NORTH OVER 
SOUTHERN MEXICO AND CENTRAL AMERICA. OTHER THAN THE ITCZ WEST OF 
130W AND NORTH OF 29N THE AREA IS DRY AND CLOUD FREE IN THE 
MIDDLE AND UPPER LEVELS.  NORTH OF 29N THE MIDDLE AND UPPER 
LEVELS ARE MOIST BUT IT IS CLOUD FREE EXCEPT FOR BROKEN 
STRATOCUMULUS IN THE LOWER LEVELS WEST OF 129W.

AT THE SURFACE MODERATE RIDGE IS NORTH OF 13N WEST OF 115W. 
REMAINDER OF THE SURFACE IS ANALYZED AS BROAD TROUGH. THE RIDGE 
IS FORECAST TO WEAKEN SOME IN THE NEXT SEVERAL DAYS BUT REMAIN 
IN PLACE.

$$
LL