000
AXPZ20 KNHC 070909
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SUN DEC 07 2008

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

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC.

...ITCZ...
ITCZ AXIS ALONG 6N77W 9N120W 10N135W 8N140W. NUMEROUS MODERATE 
TO STRONG WITHIN 270 NM N OF AXIS FROM 113W-119W.

...DISCUSSION...
LARGE WELL-DEFINED MIDDLE/UPPER LEVEL CYCLONIC CIRCULATION IS 
CENTERED NEAR 23N138W IS DRIFTING W. A TROUGH AXIS EXTENDS S 
FROM THE CIRCULATION TO NEAR 14N140W. A 85-95 KT JET STREAM 
EXTENDS FROM NEAR 20128W NE TO SOUTHERN CALIFORNIA AND NORTHERN 
ARIZONA AND THEN DIVES SOUTHWARD ACROSS THE TEXAS BIG BEND INTO 
CENTRAL MEXICO. THICK DENSE MIDDLE AND UPPER LEVEL CLOUDS ARE 
WITHIN 450 NM SE OF THE JET. MID/UPPER RIDGE WITH AXIS FROM NW 
MEXICO NEAR 31N111W TO AN ANTICYCLONIC CIRCULATION NEAR 8N112W. 
UPPER LEVEL DIFFLUENT FLOW IS ENHANCING CONVECTIVE ACTIVITY 
ASSOCIATED WITH A SURFACE TROUGH ALONG THE ITCZ FROM  7N-12N 
BETWEEN 112W-119W. THE TROUGH HAS AN AXIS FROM 13N116W TO 5N117W.
AN UPPER LEVEL TROUGH EXTENDS FROM THE BAY OF CAMPECHE ACROSS 
THE GULF OF TEHUANTEPEC SWD TO THE EQUATOR AT 94W. MODERATE TO 
STRONG SUBSIDENCE WITH DRY STABLE AIR COVERS THE AREA E OF 110W.

WEAK SURFACE TROUGH EXTENDS FROM 23N137W TO 17N136W. A FEW 
SHOWERS ARE ALONG THE TROUGH. SURFACE RIDGE WITH AXIS FROM 
32N127W TO 15N115W.

$$
DGS