000
AXPZ20 KNHC 202159
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC MON DEC 20 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 05N77W TO LOW PRES AT 07N87W TO 05N90W TO 05N100W TO 
12N116W TO LOW PRES AT 10N121W TO 06N140W.  NO SIGNIFICANT 
CONVECTION.

.DISCUSSION...
MOST OF BASIN REMAINS FAIRLY DRY ALOFT AS AXIS OF UPPER LEVEL 
TROUGH AND BROAD RIDGE DOWNSTREAM COVER MOST OF E PAC WITH 
SUBSIDING AIR MASS.  MAIN MOISTURE ADVECTION HAPPENS ALONG NW 
CORNER AHEAD OF COLD FRONT PRESENTLY FROM 32N120W TO 23N140W.
EVEN ITCZ SUFFERS FROM LACK OF MOISTURE WITH NO SIGNIFICANT 
CONVECTION ION SPITE OF GOOD LOW LEVEL CONVERGING WINDS NEAR TWO 
LOW PRES CENTERS...ONE AT 07N87W AND ANOTHER AT 09N119W.  BOTH 
CENTERS EXPECTED TO WEAKEN SIGNIFICANTLY WITHIN NEXT 24-48 HRS.  

COLD FRONT AND ASSOCIATED LONG PERIOD NW 12-14 FT SWELLS ARE 
MAIN CONCERN THROUGH PERIOD.  ENERGY SURGE WITHIN 24 HRS EXPANDS 
STRONG NW WINDS SPREADING SWELLS SE AS FAR AS 118W.  FRONT ALSO 
KICKS SW WINDS WITHIN GULF OF CALIFORNIA BUT SHOULD REMAIN N OF 
30N.  

LOW PRES AT 07N87W ENHANCE DOWNSLOPE DRAINAGE WINDS TONIGHT JUST 
E OF GULF OF PAPAGAYO INCREASING FROM MODERATE TO A FRESH 
BREEZE.  WINDS LIKELY WEAKEN DURING DAYTIME HOURS.   
        
$$
WALLY BARNES