000
AXPZ20 KNHC 220330
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC TUE DEC 22 2009

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...

THE INTERTROPICAL CONVERGENCE ZONE IS ALONG THE LINE...05N77W TO 
07N87W TO 03N100W TO 09N140W. SCATTERED MODERATE CONVECTION 
WITHIN 120 NM EITHER SIDE OF AXIS FROM E OF 87W. 

...DISCUSSION...
HIGH AMPLITUDE UPPER LEVEL TROUGH WITH AXIS W OF THE FORECAST 
AREA FROM 30N140W TO 05N152W. SW FLOW E OF THE TROUGH AXIS IS 
ADVECTING MID AND UPPER LEVEL MOISTURE ACROSS THE FORECAST AREA 
FROM 06N140W TO THE NORTHERN BAJA PENINSULA. A SHORT WAVE TROUGH 
LIES N OF THE AREA. A RIDGE EXTENDS FROM 06N118W TO MAINLAND 
MEXICO. AN UPPER LEVEL TROUGH IS ACROSS THE E PORTION OF THE 
FORECAST AREA. WITH ONLY LIMITED ITCZ CONVECTION W OF 90W...THE 
UPPER RIDGE WILL WEAKEN AND ALLOW THE TROUGH W OF THE AREA TO 
DRIFT EAST OVER THE NEXT COUPLE OF DAYS.

A WEAK RIDGE LIES ACROSS THE AREA...AS A RESULT...FRESH TO 
STRONG TRADES ARE CONFINED FROM 10N TO 19N W OF 130W. THE UPPER 
SHORT WAVE TROUGH MENTIONED IN THE PREVIOUS PARAGRAPH WILL SHIFT 
INTO THE W US TONIGHT...AND STRONG SURFACE HIGH PRESSURE WILL 
BUILD N OF THE AREA. THIS WILL BRING AN INCREASE IN WINDS N OF 
27N E OF 124W. WITH LOW PRESSURE OVER THE GREAT BASIN REGION...A 
TIGHT PRESSURE GRADIENT WILL RESULT...AND WINDS WILL INCREASE TO 
20 KT IN THE GULF OF CALIFORNIA N OF 29N BY TUESDAY NIGHT. WITH 
HIGH PRESSURE N OF THE FORECAST AREA...TRADES WILL ALSO 
INCREASE. NW SWELL CONTINUES TO AFFECT MUCH OF THE FORECAST AREA 
N OF 09N W OF 116W.   

GAP N TO NE WINDS OF 20 TO 30 KT ARE OCCURRING THROUGH THE GULF 
OF TEHUANTEPEC ARE EXPECTED TO DIMINISH TUESDAY.

GAP NE TO E WINDS OF 20 KT ARE OCCURRING IN THE GULF OF PAPAGAYO 
REGION AND ARE FORECAST TO DIMINISH TUESDAY.

FOR ADDITIONAL INFORMATION PLEASE VISIT 
HTTP://WWW.HURRICANES.GOV/MARINE
  
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AL