000
AXPZ20 KNHC 060914
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC TUE SEP 06 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 13N87W 1007 MB LOW PRES 18N107W 1011 MB LOW 
PRES 11N124W 08N140W. SCATTERED MODERATE ISOLATED STRONG 
CONVECTION FROM 6N-16N BETWEEN 90W-110W.

...DISCUSSION...
THE BROAD UPPER LEVEL TROUGH THAT WAS AFFECTING THE NW CORNER OF 
THE DISCUSSION AREA IS WEAKENING AND LIFTING OUT TO THE NE. THE 
TROUGH AXIS CURRENTLY EXTENDS FROM 32N126W TO 24N132W. 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 NORTHERN MEXICO NEAR 29N105W WITH 
RIDGE EXTENDING SW ACROSS THE CENTRAL BAJA CALIFORNIA PENINSULA 
TO 21N132W.  SOUTH OF RIDGE NE TO E FLOW ALOFT PERSISTS. UPPER 
DIFFLUENCE S OF THE RIDGE AXIS IS HELPING TO SUPPORT SCATTERED 
MODERATE ISOLATED STRONG CONVECTION N OF 07N BETWEEN 90W-110W.   

SURFACE HIGH PRES RIDGE IS N OF 15N W OF 120W. THE 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 
8N-11N BETWEEN 95W-105W. THIS AREA OF WINDS IS FORECAST TO 
EXPAND WWD WITHIN THE NEXT 24 HOURS. OTHERWISE LONG PERIOD CROSS 
EQUATORIAL SWELL CONTINUES TO DOMINATE THE AREA S OF 15N BETWEEN 
90W-125W WITH SEAS 8-10 FT.

A  1007 MB LOW PRES IS CENTERED NEAR 19N107W. NO WEATHER OR 
WINDS ASSOCIATED WITH THE LOW...BROKEN TO OVERCAST STRATOCUMULUS 
CLOUDS BLANKET THE AREA N OF 18N W OF 120W.

$$
DGS