000
AXPZ20 KNHC 250920
TWDEP 

TROPICAL WEATHER DISCUSSION   
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC THU JUN 25 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 8N78W 7N85W 13N110W 6N140W. SCATTERED MODERATE 
CONVECTION WITHIN 60 NM N OF AXIS FROM 81W-93W. SCATTERED 
MODERATE ISOLATED STRONG CONVECTION WITHIN 180 NM S OF AXIS FROM 
118W-125W AND WITHIN 120 NM S OF AXIS FROM 128W-138W.

...DISCUSSION...
AN UPPER LEVEL CYCLONIC CIRCULATION IS CENTERED NEAR 32N124W
WITH TROUGH FROM THE CYCLONE TO 25N126W. A SLY 70-90 KT JET 
STREAM IS E OF THE TROUGH AXIS FROM 29N123W TO BEYOND 32N120W.
SW OF THE TROUGH IS AN UPPER LEVEL ANTICYCLONIC CIRCULATION
NEAR 18N131W. ANTICYCLONIC FLOW COVERS THE AREA FROM 10N-25N
W OF 125W WITH THE RIDGE AXIS FROM 20N124W TO THE ANTICYCLONIC
CIRCULATION TO 17N140W. STRONG SUBSIDENCE WITH DRY STABLE AIR AT 
THE MIDDLE AND UPPER LEVELS OF THE ATMOSPHERE COVERS THE AREA N 
OF THE ITCZ W OF 115W. AN UPPER LEVEL ANTICYCLONIC CIRCULATION 
OVER EASTERN NEW MEXICO WITH RIDGE ACROSS THE MIDDLE OF MEXICO 
TO 13N102W. THE AIRMASS REMAINS RATHER MOIST E OF 110W WITH 
AREAS OF CONVECTION...HOWEVER NOT AS EXTENSIVE AS THE PAST FEW 
DAYS.
 
A 1010 MB LOW IS ANALYZED ALONG THE ITCZ NEAR 11N121W. SCATTERED 
SHOWERS ARE WITHIN IN 70 NM N OF THE LOW...OTHERWISE MOST THE
CONVECTIVE ACTIVITY IS 180 NM S OF THE ITCZ BETWEEN118W-125W.
WINDS OF 20 KT ARE WITHIN 180 NM SE OF THE LOW AND 90 NM NW OF 
THE LOW. SURFACE RIDGE COVERS THE AREA N OF 15N W OF 105W...WITH
AXIS FROM 30N140W TO 21N105W. BROKEN TO OVERCAST CLOUDS BLANKET
THE AREA N OF 15N W OF 115W.

$$
DGS