000
AXPZ20 KNHC 110947
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC MON MAY 11 2009

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. 

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC.

...ITCZ...
AXIS ALONG 06N78W TO 08N114W TO 05N124W TO 06N130W TO 06N140W. 
SCATTERED MODERATE CONVECTION WITHIN 60 NM S OF AXIS E OF 91W.  
SCATTERED MODERATE ISOLATED STRONG CONVECTION WITHIN 210 NM S OF 
AXIS FROM 100W TO 110W.  SCATTERED MODERATE TO STRONG CONVECTION 
FROM 08N TO 13N BETWEEN 110W AND 118W.

...DISCUSSION...
LARGE AMPLITUDE UPPER LEVEL TROUGH FROM 32N124W TO POORLY 
DEFINED WEAK CYCLONE AT 02N104W.  AREA OF DIFFLUENCE BETWEEN 
TROUGH AND BROAD RIDGE DOWNSTREAM AT 14N100W ENHANCES DEEP 
CONVECTION ALONG INTERSECTION OF ITCZ AND WEAKENING SURFACE 
TROUGH ALONG 117W.  LARGE PLUME OF MOIST CONVECTION DEBRIS HEADS 
N TRAPPED BETWEEN TROUGH AND RIDGE FEEDING THERMAL LOW PRES 
ALONG CENTRAL MEXICO AND PROMPTING CONVECTION OVER DAYTIME 
HEATED AREAS OF MEXICO. 

HIGH PRES CENTER 1025 MB AT 33N138W WEAKENS AT FIRST DIMINISHING 
WINDS ALONG COAST OF CALIFORNIA HENCE SUBSIDE NORTHERLY SWELLS 
ENCROACHING ALONG W OF BAJA PENINSULA...THEN MOVING E BY EARLY 
WED FORCING NEW TRAINS OF MODERATE SWELLS N OF 28N E OF 120W.

$$
WALLY BARNES