000
AXPZ20 KNHC 080922
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC THU SEP 08 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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC.

...ITCZ/MONSOON TROUGH...
MONSOON TROUGH 16N95W 17N110W 12N130W 8140W. SCATTERED ISOLATED 
STRONG CONVECTION FROM 7N-10N BETWEEN 85W-90W AND FROM 11N-13N 
BETWEEN 111W-119W.

...DISCUSSION...
BROAD UPPER LEVEL RIDGE OVER THE NW PORTION OF THE DISCUSSION 
AREA IS N OF 15N W OF 120W. A SHARP NARROW TROUGH IS E OF THE
RIDGE FROM NORTHERN BAJA CALIFORNIA TO 23N123W. STRONG 
SUBSIDENCE WITH DRY STABLE AIR AT THE MIDDLE AND UPPER LEVELS
IS N OF 15N W OF 120W. A LARGE UPPER LEVEL ANTICYCLONIC 
CIRCULATION IS CENTERED OVER WESTERN MEXICO NEAR 25N107W. RIDGE 
EXTENDS FROM THE ANTICYCLONE ACROSS THE SOUTHERN BAJA CALIFORNIA 
PENINSULA TO 22N120W. MODERATE TO STRONG SUBSIDENCE IS NEAR THE 
CENTER OF THE ANTICYCLONIC CIRCULATION.

BROAD SURFACE RIDGE IS N OF 20N W OF 120W. THE PRES PATTERN 
CONTINUES TO BE WEAK...WITH TRADES REMAINING LESS THAN 20 KT.
HOWEVER A BAND OF SW WINDS 20-25 KT FROM 8N-12N BETWEEN 
110W-118W. NLY WINDS HAVE INCREASED TO 20 KT IN THE GULF OF 
TEHUANTEPEC AND ARE EXPECTED TO CONTINUE THROUGH THE NEXT 48 
HOURS.

A 1012 MB LOW IS CENTERED NEAR 11N133W. S TO SW WINDS 20-25 KT 
WITH SEAS 8 TO 10 FT ARE WITHIN 90 NM SE SEMICIRCLE OF THE LOW.

$$
DGS