000
AXPZ20 KNHC 270258
TWDEP 

TROPICAL WEATHER DISCUSSION   
NWS NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC TUE MAR 27 2012

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. THE FOLLOWING INFORMATION IS 
BASED ON SATELLITE IMAGERY...WEATHER OBSERVATIONS...RADAR...AND 
METEOROLOGICAL ANALYSIS.

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0300 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...

THE ITCZ AXIS EXTENDS FROM 06N118W TO 06N140W. SCATTERED 
MODERATE CONVECTION WAS NOTED WITHIN 90 NM OF AXIS BETWEEN 118W 
AND 128W.

...DISCUSSION...

WEAK SURFACE HIGH PRESSURE...1021 MB IS CENTERED NEAR 28N121W. 
THE PRESSURE GRADIENT BETWEEN THIS FEATURE AND LOWER PRESSURE IN 
THE VICINITY OF THE ITCZ IS RESULTING IN FRESH TRADEWINDS FROM 
07N TO 13N BETWEEN 113W AND 125W. THIS AREA OF HIGH PRESSURE 
WILL REMAIN OVER THE NEXT COUPLE OF DAYS MAINTAINING THE AREA OF 
FRESH TRADES. SUBSIDING NW SELL PREVAILS OVER MUCH OF THE AREA N 
OF 07N W OF 110W. THE SWELL WILL CONTINUE TO SPREAD 
SOUTHWARD...AND WILL COVER MUCH OF THE AREA S OF 20N W OF 110W 
BY TUE NIGHT. S OF 05N...THE NW SWELL WILL MERGE WITH SW SWELL 
MOVING UP FROM THE SOUTHERN HEMISPHERE. 

A COLD FRONT IS LOCATED JUST NW OF THE AREA. THE FRONT WILL MOVE 
INTO THE AREA DURING THE OVERNIGHT HOURS. THE SUPPORTING UPPER 
LEVEL TROUGH IS LIFTING OUT WHICH WILL DECREASE THE PUSH BEHIND 
THE FRONT...WHILE THE SURFACE RIDGE WILL REMAIN IN PLACE. AS A 
RESULT...THE FRONT WILL SHIFT ONTO THE NW PART OF THE AREA...BUT 
WILL STALL AND DISSIPATE OVER THE NW PART OF THE AREA BY WED 
NIGHT. THIS FRONT WILL ALSO USHER IN A NEW SET OF NW 
SWELLS...WITH COMBINED SEAS PEAKING AT 14 FT TUE NIGHT.  

$$
AL