000
AXPZ20 KNHC 030917
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SAT SEP 03 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...
THE MONSOON TROUGH 15N107W 12115W 14N130W 13N140W. SCATTERED 
MODERATE TO STRONG CONVECTION FROM 8N-11N BETWEEN 116W-120W.

...DISCUSSION...
UPPER LEVEL CYCLONIC CIRCULATION OVER THE NW PORTION OF THE 
DISCUSSION AREA IS CENTERED NEAR 30N132W WITH A TROUGH EXTENDING 
FROM THE CIRCULATION SW TO 19N138W. A 50-70 KT WIND MAX IS E OF 
THE TROUGH AXIS FROM 23N132W TO 32N125W. DOWNSTREAM BROAD UPPER 
LEVEL ANTICYCLONIC CIRCULATION IS CENTERED NEAR 24N115W WITH 
RIDGE N ACROSS BAJA CALIFORNIA INTO ARIZONA. STRONG SUBSIDENCE 
WITH DRY STABLE AIR AT THE MIDDLE AND UPPER LEVELS IS N OF 20N W 
OF 115W. SOUTH TO THE ANTICYCLONE NE TO E FLOW ALOFT PERSISTS 
YIELDING LIGHT TO MODERATE SHEAR ALOFT ACROSS THE DEEP TROPICS.

SURFACE HIGH PRES RIDGE REMAINS WEAK N OF 17N W OF 115W. AS A 
RESULT THE TRADES REMAIN LESS THAN 20 KT. HOWEVER A SMALL BAND 
OF SW WINDS CONTINUES FROM 9N-11N BETWEEN 105W-110W.

LONG PERIOD CROSS EQUATORIAL SWELL CONTINUES TO DOMINATE THE 
REGIONAL WATERS AND WILL GRADUALLY SUBSIDE. 

$$
DGS