000
AXPZ20 KNHC 091547
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC MON APR 9 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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1500 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...ITCZ AXIS 
02N116W TO 03N140W.  SCATTERED STRONG CONVECTION WITHIN 90 NM OF 
AXIS W OF 134W.

DISCUSSION...
UPPER LEVEL TROUGH OVER FAR NW PORTION OF AREA WITH AXIS FROM 
32N135W TO 22N140W.  APPROACHING 130 KT JETSTREAM ASSOCIATED 
WITH STRONG SHORT WAVE TROUGH ADVECTS UPPER LEVEL MOISTURE OVER 
WEAK COLD FRONT INTO AN OTHERWISE VERY DRY AIR MASS.  SCATTERED 
MODERATE CONVECTION ASSOCIATED WITH COLD FRONT WITHIN 150 NM OF 
BOUNDARY.  MODERATE TO STRONG SUBSIDENCE WITH DRY STABLE AIR AT 
MID AND UPPER LEVELS ELSEWHERE N OF 07N E OF 105W.

AT THE LOWER LEVELS...
COLD FRONT EXTENDS FROM 32N128W TO 22N140W WITH A MODERATE 
BREEZE WITHIN 90 NM E OF BOUNDARY.  W OF FRONT...APPROACHING 
UPPER LEVEL SHORT WAVE TROUGH REINFORCES SURGE OF WIND LATE 
TODAY AND TONIGHT WITH NW WINDS INCREASING TO A STRONG BREEZE.  
LARGE NW SWELLS...UP TO 14 FT...ASSOCIATED WITH DEEP SURFACE LOW 
WELL N OF BASIN.  FRONT MOVE SE TO 32N124W TO 21N132W TONIGHT... 
WEAKENS AND DISSIPATES BY LATE WED.  

HIGH PRES CENTER 1019 MB AT 22N122W MAINTAINS LID ON CLOUD 
DEVELOPMENT.  MAINLY STRATIFIED LAYERS OF LOW LEVEL CLOUDS NOTED 
OVER LARGE EXPANSES OF BASIN.  
 
WEAK TROUGH OVER CENTRAL GULF OF MEXICO FUNNELS NLY WINDS ACROSS 
CHIVELAS PASS PROMPTING A STRONG NLY BREEZE ACROSS GULF OF 
TEHUANTEPEC WITH SEAS BUILDING TO 10 FT TONIGHT THEN DECREASE 
LATE TUE.

CROSS EQUATORIAL SW SWELL TO 9 FT S OF 10N W OF 105W SUBSIDE IN 
HEIGHT AND COVERAGE TONIGHT AND TUE.

$$
WALLY BARNES