000
AXPZ20 KNHC 010344
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC MON DEC 01 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...
INTERTROPICAL CONVERGENCE ZONE ALONG...14N93W TO 07N130W TO 
08N140W.  ISOLATED MIDERATE CONVECTION W OF 135W

...DISCUSSION...
MID-UPPER LEVEL THROUGH 25N113W TO 32N129W BRINGS VERY DRY AIR 
MASS ALOFT N OF AXIS.  TROUGH W WINDS COMPLETELY FLATTEN CREST 
OF RIDGE CENTERED IN ANTICYCLONE AT 12N112W.  MOISTURE ALOFT 
THINS JUST S OF WEAK 85 KT JET CORE TAIL JUST S AND PARALLEL TO 
TROUGH AXIS.  LONG WAVE DEEP LAYER TROUGH RUNS S OF TEHUANTEPEC 
TO CYCLONIC VORTEX AT 07N99W KEEPS REMAINDER E PAC FAIRLY DRY 
AND FORCES MINOR TROPICAL MOISTURE INTRUSION ALONG ITCZ EASTWARD 
OVER CENTRAL AMERICA.  NEGATIVELY TILTED TROUGH ALOFT UPSTREAM 
OF RIDGE FROM 15N131W TO 03N113W INTRODUCING MOISTURE W OF 120W. 

AT THE SURFACE...
BROAD WEAKENING HIGH PRES CENTER 1022 MB AT 29N135W HAS RIDGE 
EXTEND TO 14N106W SUPPORTING TRADE WINDS FROM 12N-20N W OF 130W. 
TRADES DIMINISH WITH RIDGE AS COLD FRONT APPROACHES FROM NW.  
LARGE LONG PERIOD NW SWELL SPREAD OVER ENTIRE BASIN W OF 108W.  

SIMILARLY STRONG NW WINDS OVER GULF OF CALIFORNIA DIMINISH 
WITHIN NEXT 24 HRS AS LOW PRES OVER SW CONUS MOVES E. 

$$
WALLY BARNES