000
AXPZ20 KNHC 240257
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC WED DEC 24 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 
0300 UTC.

...ITCZ...
ITCZ IS ALONG 3N77W 8N105W 8N120W 9N130W 7N140W. SCATTERED 
MODERATE ISOLATED STRONG CONVECTION WITHIN 100 NM S OF AXIS 
FROM 116W-118W AND WITHIN 120 NM N OF AXIS FROM 125W-128W.

...DISCUSSION...
THE LARGE MID/UPPER LEVEL CYCLONIC CIRCULATION HAS MOVED W OF 
THE DISCUSSION AREA NEAR 18N144W...HOWEVER UPPER LEVEL DIFFLUENT 
FLOW NE OF THE CIRCULATION IS ENHANCING AN AREA OF CONVECTIVE 
ACTIVITY FROM 17N-22N BETWEEN 137W-140W. UPPER LEVEL RIDGE WITH 
AXIS FROM 32N124W TO 9N115W. DEEP LAYER TROUGH EXTENDS FROM THE 
SOUTHERN ROCKIES ACROSS NW MEXICO THROUGH SOUTHERN GULF OF 
CALIFORNIA TO 22N112W. ASSOCIATED SURFACE COLD FRONT EXTENDS 
FROM SE ARIZONA ACROSS THE CENTRAL BAJA PENINSULA TO 26N123W. 
THERE ARE A FEW SHOWERS E OF THE FRONT ALONG THE ARIZONA/MEXICO 
BORDER. 

AN UPPER LEVEL CYCLONIC CIRCULATION IS CENTERED NEAR THE GULF OF 
TEHUANTEPEC WITH TROUGH TO 6N97W. STRONG SUBSIDENCE WITH DRY 
STABLE AIR AT THE MIDDLE AND UPPER LEVELS OF THE ATMOSPHERE 
DOMINATES THE AREA E OF 110W. SKIES ACROSS THE AREA ARE MOSTLY 
CLEAR EXCEPT FOR A BAND OF LOW CLOUDS ALONG 10N AND S OF THE 
ITCZ.

A FEW SURFACE TROUGHS ARE ANALYZED ALONG THE ITCZ. AN EARLIER 
TROUGH HAS SPLIT...FORMING A TROUGH FROM 17N110W TO 
07N115W...BUT LEAVING A WEAK STATIONARY TROUGH FROM 12N109W TO 
06N110W. THE LATTER FEATURE WAS NOTED ON THE LAST VISIBLE 
IMAGERY OF THE DAY. SCATTERED SHOWERS AND TSTMS ARE WITHIN 180 
NM E OF THE TROUGH. ANOTHER TROUGH IS NOTED FROM 15N133W TO 
9N114W. SCATTERED SHOWERS ARE WITHIN 60 NM EITHER SIDE OF THE 
TROUGH. 17N11W TO 07N115W...WITH A WEAK STATIONARY TROUGH FROM 
$$
DGS