000
AXPZ20 KNHC 040913
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SUN SEP 04 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 FROM 15N105W 13N115W 13N140W. SCATTERED 
MODERATE TO STRONG CONVECTION FROM 09N-12N BETWEEN 104W-113W.

...DISCUSSION...
UPPER LEVEL CYCLONIC CIRCULATION JUST N OF THE DISCUSSION AREA 
IS CENTERED NEAR 33N129W WITH A TROUGH EXTENDING FROM THE 
CIRCULATION S TO 21N135W. A 70-90 KT JETSTREAM IS E OF THE 
TROUGH AXIS FROM 27N127W TO 32N125W. DOWNSTREAM BROAD UPPER 
LEVEL ANTICYCLONIC CIRCULATION IS CENTERED OFF THE CENTRAL COAST 
OF THE BAJA CALIFORNIA PENINSULA NEAR 27N116W WITH RIDGE 
EXTENDING S ALONG THE COAST OF MEXICO TO 16N97W. 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 TROUGH OVER THE NW PORTION OF THE AREA FROM 32B130W TO
30N140W. THE PRES PATTERN IS WEAK AS A RESULT THE TRADES 
REMAIN LESS THAN 20 KT. HOWEVER A SMALL BAND OF SW WINDS 
CONTINUES FROM 9N-11N BETWEEN 105W-115W. OTHERWISE LONG PERIOD 
CROSS EQUATORIAL SWELL CONTINUES TO DOMINATE THE AREA S OF 15N 
BETWEEN 80W-120W.

A 1010 MB LOW PRES IS ANALYZED NEAR 15N105W. NO SIGNIFICANT 
WEATHER OR WINDS ASSOCIATED WITH THE LOW.

$$
DGS