000
AXPZ20 KNHC 050919
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC MON SEP 05 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 FROM 13N88W 15N105W 10N130W 11N140W. SCATTERED 
MODERATE TO STRONG CONVECTION WITHIN 150 NM S OF AXIS FROM 
90W-97W AND WITHIN 300 NM S OF AXIS FROM 101W-104W.

...DISCUSSION...
AN E-W UPPER LEVEL RIDGE EXTENDS FROM 19N132W TO AN ANTICYCLONIC 
CIRCULATION JUST W OF THE DISCUSSION AREA NEAR 15N143W. A 
WEAKENING UPPER LEVEL TROUGH WITH AXIS FROM 32N127W TO 22N132W. 
STRONG SUBSIDENCE WITH DRY STABLE AIR AT THE MIDDLE AND UPPER 
LEVELS IS N OF 15N W OF 115W. DOWNSTREAM UPPER LEVEL 
ANTICYCLONIC CIRCULATION IS CENTERED OVER NW MEXICO NEAR THE 
ARIZONA BORDER WITH RIDGE EXTENDING SW ACROSS THE CENTRAL BAJA 
CALIFORNIA PENINSULA TO 21N127W.  SOUTH TO THE ANTICYCLONE NE TO 
E FLOW ALOFT PERSISTS YIELDING LIGHT TO MODERATE SHEAR ALOFT 
ACROSS THE DEEP TROPICS.

A 1018 MB HIGH PRES IS CENTERED NEAR 25N130W. THE SURFACE PRES 
PATTERN REMAINS WEAK AS A RESULT THE TRADES REMAIN LESS THAN 20 
KT ACROSS THE AREA. HOWEVER A SMALL BAND OF SW WINDS CONTINUES 
FROM 7N-13N BETWEEN 100W-105W. OTHERWISE LONG PERIOD CROSS 
EQUATORIAL SWELL CONTINUES TO DOMINATE THE AREA S OF 15N BETWEEN 
80W-120W WITH SEAS 8-10 FT.

SURFACE TROUGH WITH AXIS FROM 32N129W TO 27N127W. NO WEATHER OR 
WINDS ASSOCIATED WITH THE TROUGH...BROKEN TO OVERCAST 
STRATOCUMLUS CLOUDS BLANKET THE AREA N OF 15N W OF 115W.

$$
DGS