000
AXPZ20 KNHC 011540
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC THU SEP 01 2011

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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1530 UTC.

...ITCZ/MONSOON TROUGH...
MONSOON TROUGH 12N87W TO 17N99W TO 17N109W TO 15N115W TO 18N122W 
TO 11N140W. SCATTERED MODERATE ISOLATED STRONG FROM 17N TO 21N E 
OF 108W NEAR CENTRAL AMERICAN COAST AND FROM 04N TO 09N E OF 85W.

...DISCUSSION...

STRONG HIGH PRESSURE CENTERED NW OF THE AREA NEAR 41N144W 1033 
MB HAS RIDGE EXTENDING SE TO NEAR 25N120W. THE PRESSURE GRADIENT 
BETWEEN THE RIDGE AND THE MONSOON TROUGH IS MAINTAINING FRESH 20 
KT WINDS NW OF LINE 30N118W TO 15N140W. ALTHOUGH WINDS ARE LESS 
THAN 20 KT ELSEWHERE TO THE N OF 20N...SEAS ARE REPORTED TO 8 FT 
PRIMARILY DUE TO MIXING N AND S SWELL. FRESH 20 KT MONSOONAL SW 
FLOW WITH SEAS TO 11 FT IN SW SWELL PREVAILS FROM 10N TO 13N 
BETWEEN 104W AND 116W. ELSEWHERE CROSS EQUATORIAL SW SWELL IS 
NOTED S OF 20N BETWEEN 80W AND 125W RESULTING IN COMBINED SEAS 
OF 8 TO 10 FT. BOTH THE SOUTHERLY AND NORTHERLY SWELLS ARE 
FORECAST TO SUBSIDE OVER THE NEXT FEW DAYS. WITH THE RIDGE 
WEAKENING THIS WEEKEND...WINDS OVER THE NW PART OF THE AREA WILL 
DIMINISH AS A WEAKENING COLD FRONT WILL MOVE INTO THE NW PORTION.
 
$$
AL