000
AXPZ20 KNHC 011504
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC MON DEC 01 2008

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

BASED ON 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1500 UTC.

...ITCZ...
INTERTROPICAL CONVERGENCE ZONE ALONG 8N82W 8N900W 11N110W  
8N140W. SCATTERED MODERATE WITHIN 90 NM N OF AXIS W OF 137W.

...DISCUSSION...
BROAD UPPER LEVEL RIDGE COVERS THE NW PORTION OF THE DISCUSSION
AREA N OF 20N W OF 125W. AN UPPER LEVEL TROUGH/SHEAR AXIS FROM
32N124W TO THE SOUTHERN TIP OF THE BAJA PENINSULA SEPARATES THE 
RIDGE FROM AN UPPER LEVEL ANTICYCLONIC CIRCULATION OVER NORTHERN 
BAJA CALIFORNIA NEAR 31N116W. UPPER LEVEL TROUGH IN THE DEEP
TROPICS FROM 14N122W TO 2N114W. MODERATE SUBSIDENCE IS WITHIN
250 NM EITHER SIDE OF THE TROUGH AXIS.

DEEP LAYER TROUGH EXTENDS FROM A STRONG CYCLONIC CIRCULATION 
WELL N OF THE AREA OVER THE GREAT LAKES S TO NE MEXICO NEAR 
20N98W TO 17N108W. EXCEPT FOR A FEW SHOWERS ALONG THE COAST OF 
COSTA RICA...STRONG SUBSIDENCE WITH DRY STABLE AIR AT THE MID 
AND UPPER LEVELS OF THE ATMOSPHERE DOMINATES THE AREA W OF 110W.

SURFACE RIDGE WITH AXIS FROM A 1023 MB HIGH PRES CENTERED NEAR
29N136W TO 19N118W. BROKEN/OVERCAST STRATOCUMULUS CLOUDS ARE N OF
20N W OF 115W AND ALSO S OF THE ITCZ. 

NORTHERLY WINDS OF 20 KT IN THE GULF OF TEHUANTEPEC WILL BEGIN 
LATE TODAY AND INCREASE TO GALE FORCE BY EARLY TUE.

$$
DGS