000
AXPZ20 KNHC 082118
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC FRI MAY 08 2009

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 
2100 UTC.

...ITCZ...

THE INTERTROPICAL CONVERGENCE ZONE IS ALONG THE LINE...06N77W TO 
08N105W TO 04N140W. SCATTERED MODERATE WITH ISOLATED STRONG 
CONVECTION IS WITHIN 100 NM OF THE POINT 07N89W. SCATTERED 
MODERATE WITH ISOLATED STRONG CONVECTION IS WITHIN 60 NM OF THE 
POINT 05N94W. SCATTERED MODERATE WITH ISOLATED STRONG CONVECTION 
IS WITHIN 90 NM OF THE POINT 08N119W.

...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 20N116W AND 
IT IS DRIFTING WEST SLOWLY. 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 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 30N THE AREA IS DRY AND CLOUD FREE IN THE MIDDLE AND 
UPPER LEVELS.  NORTH OF 30N THE MIDDLE AND UPPER LEVELS ARE 
MOIST BUT IT IS CLOUD FREE EXCEPT FOR BROKEN STRATOCUMULUS IN 
THE LOWER LEVELS WEST OF 128W.

AT THE SURFACE MODERATE RIDGE IS NORTH OF 17N WEST OF 120W. 
OTHERWISE WEAK RIDGE IS NORTH OF THE ITCZ WEST OF 110W. 
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