000
AXPZ20 KNHC 060916
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SAT DEC 06 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 IS ALONG 6N78W 7N105W 10N125W 6N140W. NUMEROUS TO 
STRONG CONVECTION WITHIN 180 NM S OF AXIS FROM 122W TO 127W.

...DISCUSSION...
A LARGE UPPER LEVEL CYCLONIC CIRCULATION OVER THE FAR W PORTION 
OF THE DISCUSSION AREA IS CENTERED NEAR 25N137W WITH TROUGH 
EXTENDING SW TO 14N140W. ISOLATED SHOWERS ARE LOCATED WITHIN THE 
CENTER OF THE CYCLONIC CIRCULATION. A 90-100 KT JET STREAM IS S 
OF THE TROUGH FROM 14N138W TO 29N118W. ANOTHER CYCLONIC 
CIRCULATION IS CENTERED NEAR 32N124W. MODERATE TO STRONG 
SUBSIDENCE IS WITHIN 180 NM W OF THE CYCLONIC CIRCULATION. UPPER 
LEVEL RIDGE EXTENDS FROM THE NORTHERN GULF OF CALIFORNIA TO THE 
EQUATOR AT 122W. UPPER LEVEL DIFFLUENT FLOW BETWEEN THE RIDGE 
AND THE CYCLONIC CIRCULATION IS ENHANCING A LARGE AREA OF SHOWER 
ACTIVITY WITH EMBEDDED TSTMS FROM 7N-21N BETWEEN 122W-127W. A 
BROAD UPPER LEVEL TROUGH WITH AXIS FROM THE BAY OF CAMPECHE 
THROUGH THE GULF OF TEHUANTEPEC TO THE EQUATOR AT 98W. MODERATE 
TO STRONG SUBSIDENCE IS N OF THE ITCZ TO 20N E OF 105W.

A COUPLE OF TROUGHS ARE ANALYZED ALONG THE ITCZ. THE FIRST IS
LOCATED FROM 10N112W TO 4N113W AND THE SECOND FROM 13N129W TO 
7N130W. NO SIGNIFICANT WEATHER ASSOCIATED WITH EITHER TROUGH.

GALE FORCE WINDS IN THE GULF OF TEHUANTEPEC ARE EXPECTED TO 
DECREASE LATER THIS MORNING AS THE PRES GRADIENT OVER SOUTHERN 
MEXICO WEAKENS.

$$
DGS