000
AXPZ20 KNHC 280925
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC TUE JUL 28 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.

...TROPICAL WAVES...
TROPICAL WAVE FROM 6N-16N ALONG 108W/109W MOVING W 15 KT. STRONG 
CONVECTION IS FROM 10N-13N WITHIN 120 NM W AND 60 NM E OF THE 
WAVE.

TROPICAL WAVE FROM 6N-17N ALONG 126W MOVING W 15 KT. SCATTERED 
MODERATE TO STRONG CONVECTION FROM 8N-14N BETWEEN 122W AND 
129W.

TROPICAL WAVE FROM 5N-13N ALONG 130W MOVING W 10-15 KT. 
SCATTERED MODERATE ISOLATED STRONG CONVECTION FROM 6N-9N BETWEEN 
131W-136W.

...ITCZ...
AXIS IS ALONG 8N88W 7N95W 12N120W 06N140W. SCATTERED MODERATE TO 
STRONG CONVECTION WITHIN 90 NM S OF AXIS FROM 100W-105W AND FROM 
8N-13N BETWEEN 106W-112W AND FROM 8N-14N BETWEEN 122W-129W. 

...DISCUSSION...
AN UPPER LEVEL TROUGH EXTENDS FROM CYCLONIC CIRCULATION N OF THE 
DISCUSSION AREA TO 32N136W TO 15N140W. HIGH LEVEL MOISTURE IS 
ALONG THE TROUGH N OF 29N. OTHERWISE MODERATE TO STRONG 
SUBSIDENCE WITH DRY STABLE AIR AT THE MIDDLE AND UPPER LEVELS OF 
THE ATMOSPHERE IS N OF 20N W OF 120W. SE OF THE TROUGH AN
ANTICYCLONIC CIRCULATION IS CENTERED NEAR 17N122W. UPPER LEVEL
DIFFLUENT FLOW SW OF THE ANTICYCLONIC CIRCULATION IS ENHANCING 
CONVECTION ALONG THE ITCZ AND A TROPICAL WAVE BETWEEN 120W-135W. 

A LARGE UPPER ANTICYCLONIC CIRCULATION IS CENTERED OVER NW 
MEXICO NEAR 29N111W WITH A RIDGE EXTENDING SW TO ANOTHER 
ANTICYCLONIC CIRCULATION NEAR 18N123W...RIDGE CONTINUES TO 
9N136W. UPPER LEVEL DIFFLUENT FLOW WITH THE ANTICYCLONE IS
ENHANCING CONVECTION ALONG THE W COAST OF MEXICO. A POORLY 
DEFINED CYCLONIC CIRCULATION IS S OF THE ANTICYCLONIC 
CIRCULATION OVER NW MEXICO...NEAR 17N113W. AN UPPER LEVEL RIDGE 
EXTENDS FROM AN ANTICYCLONIC CIRCULATION IN THE SOUTHERN 
HEMISPHERE ACROSS THE GALAPAGOS ISLANDS TO NICARAGUA. EXCEPT FOR 
MOISTURE ALONG THE ITCZ THIS AREA IS DOMINATED BY SUBSIDENCE 
WITH DRY STABLE AIR.

SURFACE RIDGE WITH AXIS FROM 32N137W TO 23N105W. BROKEN/OVERCAST 
STRATOCUMULUS CLOUDS COVER THE AREA N OF 20N W OF 120W. A SURFACE
TROUGH EXTENDS FROM THE MEXICO TEXAS BOARDER NEAR YUMA ARIZONA
TO THE TIP OF THE BAJA PENINSULA.

$$
DGS