000
AXPZ20 KNHC 080918
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC MON DEC 08 2008

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...
ITCZ AXIS ALONG 6N78W 7N110W 9120W 7N130W 11N140W. NO 
SIGNIFICANT CONVECTION.

...DISCUSSION...
WELL DEFINED MID/UPPER LEVEL CYCLONIC CIRCULATION CENTERED NEAR 
22N139W IS DRIFTING W. TROUGH EXTENDS FROM THE CIRCULATION S TO 
10N140W. SCATTERED SHOWERS ARE WITHIN 300 NM ESE OF THE CYCLONIC 
CIRCULATION. A 90-100 KT JET STREAM EXTENDS FROM 19N136W TO 
27N131W ACROSS CENTRAL BAJA CALIFORNIA INTO NW MEXICO. BROAD 
UPPER LEVEL RIDGE WITH AXIS FROM 30N125W TO 20N120W. UPPER LEVEL 
DIFFLUENT FLOW BETWEEN THE RIDGE AND CYCLONIC CIRCULATION IS 
ENHANCING CONVECTIVE ACTIVITY FROM 14N-22N BETWEEN 127W AND 132W.
SHORTWAVE TROUGH IS MOVING RAPIDLY SE FROM SOUTHERN CALIFORNIA 
INTO THE NORTHERN BAJA PENINSULA. MID/UPPER LEVEL RIDGE EXTENDS 
FROM SE TEXAS ACROSS CENTRAL MEXICO TO 6N113W. UPPER LEVEL 
TROUGH WITH AXIS FROM THE WESTERN YUCATAN PENINSULA THROUGH 
GUATEMALA TO THE EQUATOR AT 96W. MODERATE TO STRONG SUBSIDENCE
COVERS THE DISCUSSION AREA E OF 100W. 

A COUPLE OF TROUGHS ARE ANALYZED ALONG THE ITCZ. THE FIRST FROM 
12N125W TO 6N127W. SCATTERED MODERATE TO STRONG TSTMS ARE N OF
THE TROUGH FROM 12N-13N BETWEEN 123W-127W. THE SECOND TROUGH 
EXTENDS FROM 17N133W TO 8N138W.

$$
DGS