000
AXPZ20 KNHC 090949
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC FRI SEP 09 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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC.

...ITCZ/MONSOON TROUGH...
MONSOON TROUGH EXTENDS FROM 10N86W TO 15.5N95W...THEN CROSSES 
OVER SOUTHERN MEXICO TO 20N105.5W TO 13N122W TO 15N128W TO 
11N140W. SCATTERED MODERATE TO STRONG CONVECTION IS NOTED WITHIN 
180 NM N OF AXIS BETWEEN 115W AND 120W. 

...DISCUSSION...

HIGH PRESSURE...1028 MB IS CENTERED WELL N OF THE AREA NEAR 
41N134W WITH RIDGE EXTENDING SE TO NEAR 22N123W. A LOOSE 
PRESSURE GRADIENT PREVAILS OVER THE AREA...AND TRADES ARE LESS 
THAN 20 KT ACROSS THE FORECAST AREA. WITH THE CENTER OF TROPICAL 
STORM NATE IN THE EASTERN BAY OF CAMPECHE...STRONG NORTHERLY 
WINDS WILL FUNNEL THROUGH THE CHIVELA PASS AND INTO THE GULF OF 
TEHUANTEPEC REGION. THESE WINDS WILL PREVAIL THROUGH 30 
HOURS...UNTIL THE CENTER OF NATE SHIFTS INTO THE FAR W 
GULF...RESULTING IN SOUTHERLY WINDS IN THE BAY OF CAMPECHE. THIS 
WILL DIMINISH THE WINDS FUNNELING INTO THE GULF OF TEHUANTEPEC. 

OTHERWISE...MARINE CONDITIONS ACROSS THE AREA ARE DOMINATED BY 
FADING SOUTHERN HEMISPHERE SW SWELL THAT HAS BEGIN TO MIX WITH 
SE SWELL GENERATED ACROSS THE SE PACIFIC. THIS SE SWELL WILL 
CONTINUE TO MOVE THROUGH THE AREA WATERS THROUGH SAT...WHILE A 
NEW PULSE OF SW SWELL ENTERS THE AREA EARLY SAT.

$$
AL