000
AXPZ20 KNHC 100344
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC FRI DEC 10 2010

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...
AXIS ALONG 07N78W TO 04N97W TO 07N115W TO 10N140W.  SCATTERED 
MODERATE CONVECTION WITHIN 45 NM OF AXIS FROM 131W TO 134W. 

...DISCUSSION...
UPPER LEVEL TROUGH EXTEND ACROSS YUCATAN PENINSULA SW TO POORLY 
DEFINED CYCLONIC VORTEX NEAR 07N109W.  TROUGH MAINTAINS VERY DRY 
AIR MASS OVER BASIN S OF 17N E OF 117W...EXCEPT MINOR MOISTURE 
ADVECTED FROM S HEMISPHERE OVER EXTREME SE CORNER S OF 07N E OF 
87W.  BROAD UPSTREAM RIDGE MEANDERS NE AS ANOTHER WEAK CUT OFF 
CYCLONIC VORTEX DEVELOPS NEAR 20N130W FRI AND USHERS COLD FRONT 
ACROSS NW CORNER OF BASIN BEYOND FORECAST PERIOD.

AT THE SURFACE...
WELL SUPPORTED STATIONARY HIGH PRES 1024 MB CENTERED AT 29N127W 
BEGIN NW DRIFT TONIGHT.  MOVE OUGHT TO WEAKEN PERSISTENT FRESH 
NE TRADES W OF 130W WITHIN NEXT TWO DAYS.  WEAK SURFACE TROUGH 
ALONG 135W EXPECTED TO BE W OF ZONE BY END OF FORECAST PERIOD.  

DEEP LOW PRES WELL NW OF BASIN CAUSING LARGE LONG PERIOD SWELLS 
SPREADING SE INTO E PAC.  SWELLS EXPECTED TO GRADUALLY SUBSIDE 
FROM THE PRESENT 13-15 FT TO LESS THAN 8 FT BY LATE SAT NIGHT.
 
HEALTHY HIGH PRES 1027 MB OVER GULF OF MEXICO FUNNELED COLD AIR 
ACROSS ISTHMUS INTO GULF OF TEHUANTEPEC WITH STORM FORCE...BY 
NOW ABATED.  AS HIGH PRES DRIFTS E INTO WESTERN ATLC WIND ACROSS 
TEHUANTEPEC WEAKENS TO GALE TONIGHT AND BELOW GALE FORCE BY 
EARLY FRI.  AS HIGH PRES MOVES INTO WRN ATLC AND NWRN CARIBBEAN 
TONIGHT...GRADIENT WITH 1008 MB LOW PRES OVER WRN COLOMBIA COAST 
STRENGTHENS AND FORCE STRONG NE WINDS THROUGH GULFS OF PANAMA... 
FONSECA AND PAPAGAYO TONIGHT. 

$$
WALLY BARNES