000
AXPZ20 KNHC 292059
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC SUN APR 29 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 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2100 UTC.

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

THE MONSOON TROUGH AXIS EXTENDS FROM 06N90W TO LOW PRES NEAR 
05N103W 1010 MB TO 04N110W. THE ITCZ AXIS EXTENDS FROM 04N110W 
TO 06N119W TO 02N140W. SCATTERED MODERATE TO STRONG CONVECTION 
WAS NOTED WITHIN 120 NM OF AXIS BETWEEN 90W AND 107W. SCATTERED 
MODERATE CONVECTION WAS NOTED WITHIN 120 NM N OF AXIS BETWEEN 
121W AND 131W. 

...DISCUSSION...
STRONG 1034 MB HIGH PRES IS CENTERED NEAR 34N144W WITH RIDGE 
EXTENDING SE TO NEAR 19N111W. THE PRESSURE GRADIENT BETWEEN THIS 
FEATURE AND LOWER PRESSURE IN THE VICINITY OF THE ITCZ IS 
MAINTAINING FRESH TO STRONG TRADEWINDS FROM 04N TO 20N W OF 
130W. THE PRESSURE GRADIENT BETWEEN THE AREA OF HIGH PRESSURE 
AND TROUGHING OVER THE SW UNITED STATES IS MAINTAINING FRESH TO 
STRONG N TO NE WINDS W OF LINE 30N121W TO 20N130W AS DEPICTED BY 
THE LATEST ASCAT PASS. THE AREA OF HIGH PRESSURE WILL SLOWLY 
SHIFT W AND SLIGHTLY WEAKEN OVER THE NEXT TWO DAYS...WHICH WILL 
DECREASE THE COVERAGE OF FRESH TO STRONG WINDS ACROSS THIS AREA.

GALE FORCE WINDS N OF THE AREA ALONG THE CALIFORNIA COAST HAS 
BROUGHT NLY SWELL INTO THE N PART OF THE AREA...WITH COMBINED 
SEAS TO 12 FT N OF 27N BETWEEN 120W AND 126W. COMBINED SEAS WILL 
SLOWLY SUBSIDE OVER THE NEXT COUPLE OF DAYS WITH MAXIMUM SEAS 
NEAR 9 FT OVER THIS AREA BY TUE AFTERNOON. 

E OF 110W...GENTLE TO MODERATE BREEZE AND SEAS BELOW 8 FT ARE 
NOTED WITH CROSS EQUATORIAL SW SWELL WITH PERIODS IN THE 13-15 
SECOND RANGE. LITTLE CHANGE TO THIS SYNOPTIC WEATHER PATTERN IS 
EXPECTED THROUGH TUE. 

$$
AL