000
AXPZ20 KNHC 030917
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC MON AUG 03 2009

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN
FROM THE EQUATOR TO 32N...EAST OF 140W. 

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY 
THROUGH 0900 UTC.

...TROPICAL WAVES...
TROPICAL WAVE N OF 11N TO THE GULF OF TEHUANTEPEC ALONG 96W 
MOVING W 15-20 KT. ISOLATED SHOWERS ARE WITHIN 120 NM EITHER 
SIDE OF WAVE.

TROPICAL WAVE EXTENDS FROM 8N-14N ALONG 119W/120 MOVING W 15 KT. 
SCATTERED MODERATE TO STRONG CONVECTION FROM 8N-14N BETWEEN 
116W-124W.

...ITCZ...
AXIS IS ALONG 6N78W 11N112W 10N140W. SCATTERED STRONG CONVECTION 
WITHIN 90 NM N OF AXIS FROM 81W TO 83W. SCATTERED MODERATE TO 
STRONG CONVECTION WITHIN 120 NM N AND 60 NM S OF AXIS FROM
98W-101W AND FROM 8N-14N BETWEEN 116W-124W.

...DISCUSSION...
AN UPPER LEVEL TROUGH EXTENDS FROM A CYCLONIC CIRCULATION N OF 
THE AREA TO 32N130W 26N131W. ASSOCIATED SURFACE TROUGH WITH AXIS 
FROM 32N125W TO 27N130W. NO SIGNIFICANT WEATHER ASSOCIATED WITH 
THE TROUGH. SW OF THE TROUGH IS AN UPPER LEVEL ANTICYCLONIC 
CIRCULATION CENTERED NEAR 19N139W WITH RIDGE FROM THE 
CIRCULATION TO 22N130W. UPPER LEVEL MOISTURE IS MOVING TO THE N 
OF THE ANTICYCLONIC CIRCULATION FROM 25N-29N W OF 130W.
 
AN UPPER LEVEL CYCLONIC CIRCULATION IN THE DEEP TROPICS IS 
CENTERED NEAR 14N127W. UPPER LEVEL DIFFLUENT FLOW BETWEEN THE 
CYCLONIC CIRCULATION AND A DOWNSTREAM ANTICYCLONIC CIRCULATION 
IS ENHANCING CONVECTIVE ACTIVITY ALONG ITCZ WITH A SURFACE LOW 
AND TROPICAL WAVE FROM 105W-125W.

A LARGE UPPER LEVEL ANTICYCLONIC CIRCULATION IS OVER NORTHERN 
MEXICO NEAR NEAR THE BIG BEND OF TEXAS. CLUSTERS TO TSTMS ARE 
OVER NORTHERN MEXICO ARE SLOWLY DISSIPATING. AN UPPER RIDGE 
EXTENDS FROM THE ANTICYCLONIC CIRCULATION SW TO ANOTHER 
ANTICYCLONIC CIRCULATION NEAR 20N118W.

A 1012 MB SURFACE LOW ALONG THE ITCZ CENTERED NEAR 12N110W
MOVING W 15 KT. A LARGE CLUSTER OF STRONG CONVECTION IS FROM 
8N-14N BETWEEN 107W-112W. SURFACE RIDGE WITH AXIS FROM 27N122W 
TO 16N108W. BROKEN TO OVERCAST STRATOCUMULUS CLOUDS BLANKET THE 
AREA N OF 20N W OF 115W. 


$$
DGS