000
AXPZ20 KNHC 112202
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC SAT DEC 11 2010

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

BASED ON 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2100 UTC.

...ITCZ...
AXIS FROM 04N77W TO 07N85W TO 05N96W TO 09N122W TO 07N140W. 
SCATTERED MODERATE ISOLATED STRONG CONVECTION WITHIN 90 NM OF 
AXIS FROM 115W TO 130W. 

...DISCUSSION...
NARROW UPPER LEVEL TROUGH FROM TEXAS TO 23N120W TO CUT OFF 
CYCLONIC VORTEX AT 21N132W IS BOUNDARY TO ANTICYCLONIC GYRE 
32N122W.  VERY DRY AIR MASS N OF 20N AND ALSO E OF 113W WITH 
ONLY MOISTURE CONCENTRATED AROUND ITCZ FROM 113W TO 133W. 

AT THE SURFACE...
STATIONARY HIGH PRES CENTER 1028 32N128W EXTENDS RIDGE SE TO 
15N107W.  FRESH TRADES FROM 08N TO 15N W OF 133W THROUGH PERIOD 
AS WEAKENING OF RIDGE NOT AS MUCH AS PREVIOUSLY THOUGHT...BUT 
COVERAGE AREA DECREASES.  COLD FRONT LOCATED W OF AREA CLIP FAR 
NW PORTION OF BASIN SUN BUT DISSIPATE BY LATE MON.

LARGE 10-12 FT NW SWELLS WITH PERIODS BETWEEN 14-16 SEC AFFECT 
MUCH OF BASIN W OF 110W.  SWELL SUBSIDE BY MON WITH SEAS OVER 8 
FT LIMITED TO S OF 14N W OF 100W.

GAP WINDS...
WINDS OVER GULF OF TEHUANTEPEC ALL BUT GONE BY NOW BUT WITH 
RECOVERY ON SCHEDULE FOR LATE SUN COURTESY OF VERY STRONG COLD 
AIR ADVECTION ACROSS GULF OF MEXICO.  OTHER GAP WINDS DIMINISH 
WITHIN 6-12 HRS AS ATLC HIGH PRES IS FORCE E BY FRONT...ONLY TO 
RETURN AS SAME FRONT BRING STRONG COLD WINDS INTO WESTERN 
CARIBBEAN AND FUNNEL IT THROUGH CENTRAL AMERICA PASSES IN 
FONSECA...PAPAGAYO AND PANAMA. 

$$
WALLY BARNES