000
AXPZ20 KNHC 120338
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC SUN DEC 12 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 FROM 09N84W TO 07N85W TO 05N96W TO 09N123W TO 07N140W. 
ISOLATED MODERATE CONVECTION WITHIN 120 NM OF AXIS FROM 116W TO 
129W.

...DISCUSSION...
NARROW UPPER LEVEL TROUGH FROM SOUTHERN TEXAS TO 23N120W TO CUT 
OFF CYCLONIC VORTEX AT 22N130W IS BOUNDARY TO ANTICYCLONIC GYRE 
CENTERED AT 32N124W.  VERY DRY AIR MASS N OF 20N AND ALSO E OF 
111W WITH ONLY MOISTURE CONCENTRATED AROUND ITCZ FROM 115W TO 
129W. 

AT THE SURFACE...
STATIONARY HIGH PRES CENTER 1026 34N127W EXTENDS RIDGE SE TO 
15N106W.  FRESH TRADES FROM 08N TO 14N W OF 133W THROUGH PERIOD 
ALTHOUGH COVERAGE AREA DECREASES.  COLD FRONT LOCATED W OF AREA 
CLIP FAR NW PORTION OF BASIN EARLY SUN BUT DISSIPATE OVER 
NORTHERN WATERS BY LATE MON.

FRESH N -NW WINDS ALONG W COAST OF BAJA CALIFORNIA EXPECTED TO 
DIMINISH LATE TONIGHT.

GAP WINDS...
GULF OF TEHUANTEPEC GALE EVENT EXPECTED TO BEGIN SUN NIGHT 
COURTESY OF VERY STRONG COLD AIR ADVECTION ACROSS GULF OF 
MEXICO.  OTHER GAP WINDS ALL BUT GONE EARLY TONIGHT AS ATLC HIGH 
PRES IS FORCED E BY GULF OF MEXICO FRONT CROSSING INTO NW 
CARIBBEAN...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