000
AXPZ20 KNHC 152206
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC SUN NOV 15 2009

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 ALONG 07N78W TO 08N118W TO 07N127W TO 09N134W TO 08N140W.  
SCATTERED MODERATE CONVECTION WITHIN 180 NM N AND 240 NM S OF 
AXIS W OF 120W.

...DISCUSSION...
TROUGH EXTENDING FROM 32N109W THROUGH TO 28N128W LIFT N AS WELL 
ANCHORED RIDGE HOLDS ON TO EASTERN SIDE OF BASIN.  PREVIOUS 
STRONG SW JET STREAM HAS DIMINISHED TO 80 KT AND CONFLUENT FLOW 
NW OF TROUGH AXIS MAINTAINS VERY DRY AIR MASS N OF 20N FROM 
110W-135W.  

MID TO UPPER LEVEL RIDGE UPSTREAM OF TROUGH BRINGS GOOD SUPPORT 
TO SURFACE HIGH PRES 1028 MB AT 35N133W CONTINUING FRESH TO 
STRONG BREEZE ALONG TRADEWIND BELT W OF 117W...WHICH SHRINKS IN 
COVERAGE AND STRENGTH AS HIGH PRES CENTER DRIFT E FORCED BY COLD 
FRONT MOVING INTO NW CORNER OF E PAC.

HIGH PRES MOVES INLAND FORCING STRONG NW WINDS INTO GULF OF 
CALIFORNIA SPREADING DOWN S ALONG GULF.  EVENT IS SHORT LIVED AS 
HIGH PRES MOVES QUICKLY E AND RELAXES GRADIENT.  

$$
WALLY BARNES