000
AXPZ20 KNHC 091501
TWDEP 

TROPICAL WEATHER DISCUSSION   
NWS NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC MON MAY 09 2011

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

BASED ON 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1500 UTC.

...ITCZ...
AXIS IS ALONG 8N85W 10N100W 7N125W 3N140W. SCATTERED MODERATE 
ISOLATED STRONG CONVECTION WITHIN 120 NM S OF AXIS FROM 90W-95W. 
NUMEROUS MODERATE TO STRONG CONVECTION WITHIN 150 NM S AND 210 
NM N OF AXIS FROM 110W-120W AND WITHIN 250 N AND 180 NM S OF 
AXIS FROM 120W-130W.

...DISCUSSION...
UPPER LEVEL CYCLONIC CIRCULATION IS OVER THE FAR WESTERN PORTION 
OF THE DISCUSSION AREA NEAR 24N140W. A 95 KT JETSTREAM IS S OF 
THE CYCLONIC CIRCULATION FROM 15N140W TO 23N120W TO SOUTHERN 
BAJA CALIFORNIA. BROKEN TO OVERCAST CIRRUS CLOUDS ARE WITHIN 150 
NM S OF THE JET AXIS. UPPER LEVEL DIFFLUENT FLOW IS ENHANCING 
ITCZ CONVECTION FROM 110W-130W. AN UPPER LEVEL RIDGE EXTENDS 
FROM AN ANTICYCLONIC CIRCULATION NW OF THE AREA TO 32N133W 
28N122W. THE RIDGE SEPARATES THE CYCLONIC CIRCULATION TO THE SW 
FROM A TROUGH TO THE NE. THE TROUGH EXTENDS FROM A CYCLONIC 
CIRCULATION CENTERED OVER NORTHERN NEVADA S TO THE NORTHERN GULF 
OF CALIFORNIA. 

IN THE DEEP TROPICS AN UPPER LEVEL TROUGH WITH AXIS FROM 
14N101W TO 3N97W. TO THE E OF THE TROUGH AN UPPER LEVEL RIDGE 
EXTENDS FROM AN ANTICYCLONIC CIRCULATION NEAR 5N89W N THROUGH 
GUATEMALA INTO THE YUCATAN PENINSULA.

SURFACE RIDGE COVERS THE AREA N OF 12N W OF 113W. THE RIDGE 
COMBINED WITH A TROUGH OVER NW MEXICO IS PRODUCING NW WINDS 20 
KT ALONG THE COAST OF BAJA CALIFORNIA.

A 1006 MB LOW PRES IS ANALYZED ALONG THE ITCZ NEAR 8N86W. 
EARLIER STRONG CONVECTION WITH THE LOW HAS DISSIPATED. SURFACE 
TROUGH ALONG THE ITCZ FROM 11N95W TO 5N100W. SCATTERED 
CONVECTION IS ALONG THE NORTHERN PORTION OF THE TROUGH. ANOTHER 
TROUGH FROM 11N99W TO 1009 M LOW PRES NEAR 7N112W.

$$
DGS