000
AXPZ20 KNHC 060911
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC WED MAY 06 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 IS ALONG 4N77W 5N85W 10N105W 6N125W 2N140W. SCATTERED 
MODERATE CONVECTION WITHIN 60 NM N OF AXIS FROM 128W TO 134W.

...DISCUSSION...
AN UPPER LEVEL CYCLONIC CIRCULATION IS CENTERED NEAR 21N137W. A 
PLUME OF UPPER LEVEL MOISTURE WITH BROKEN HIGH CLOUDS EXTENDS 
WITHIN 500 NM IN THE NE SEMICIRCLE OF THE CYCLONIC CIRCULATION.
UPPER LEVEL ANTICYCLONIC CIRCULATION IS OFF THE CENTRAL BAJA 
CALIFORNIA COAST NEAR 27N118W...WITHIN ANTICYCLONIC FLOW N OF 
22N FROM NORTHERN MEXICO TO 125W. MODERATE TO STRONG SUBSIDENCE
WITH DRY STABLE AIR IS N OF 15N BETWEEN 115W AND 125W.

AN UPPER LEVEL TROUGH EXTENDS FROM CENTRAL MEXICO TO A CYCLONIC 
CENTERED NEAR 15N109W. E OF THE TROUGH MOIST SOUTHERLY FLOW IS 
ADVECTING MAINLY HIGH CLOUDS OVER SOUTHERN MEXICO. ANOTHER UPPER 
LEVEL ANTICYCLONIC CIRCULATION IS ALONG THE N COAST OF COSTA RICA
NEAR 10N85W. EARLIER STRONG CONVECTIVE ACTIVITY ASSOCIATED WITH 
DIFFLUENT FLOW ALOFT WITH THE ANTICYCLONIC CIRCULATION HAS 
DECREASED FROM GUATEMALA TO COSTA RICA. 

A 1026 MB SURFACE HIGH PRES IS CENTERED NEAR 27N137W WITH RIDGE 
N OF 15N W OF 115W. THE RIDGE IS FORECAST TO STRENGTHEN SOME IN 
THE NEXT SEVERAL DAYS.

$$
DGS