000
AXPZ20 KNHC 130918
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SAT SEP 13 2008

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 FROM 3N-13N IS ALONG 93W MOVING W ABOUT 10-15 KT. 
CONVECTION ASSOCIATED WITH THE WAVE IS ALONG THE ITCZ FROM 6N-8N 
BETWEEN 92W-97W.

...ITCZ...
ITCZ AXIS IS CENTERED ALONG 8N78W 6N100W 12N135W TO 10N140W. 
SCATTERED MODERATE TO STRONG WITHIN 60 NM EITHER SIDE OF AXIS E 
OF 87W.

...DISCUSSION...
MID/UPPER LEVEL ANTICYCLONIC CIRCULATION OVER THE NW PART OF 
THE DISCUSSION AREA NEAR 23N139W WITH RIDGE EXTENDING NE TO 
32N126. THE NW PORTION OF THE RIDGE IS BEING FLATTENED AS A 
SHORTWAVE TROUGH BRUSHES THE ARE N OF 30N W OF 135W. RATHER 
SHARP MID/UPPER TROUGH EXTENDS FROM SW ARIZONA ACROSS NORTHERN 
BAJA CALIFORNIA TO 21N125W. STRONG SUBSIDENCE WITH DRY AIR AT 
THE MID AND UPPER LEVELS OF THE ATMOSPHERE COVERS MUCH OF THE 
AREA W OF 110W...EXCEPT FOR A FEW SHOWERS ALONG THE ITCZ. 
ANOTHER UPPER LEVEL RIDGE EXTENDS SW FROM THE TEXAS BIG BEND 
ACROSS THE SOUTHERN TIP OF BAJA CALIFORNIA TO 19N119W.
ANOTHER ANTICYCLONE...SOMEWHAT ELONGATED...EXISTS OVER THE FAR 
SRN SECTION OF THE DISCUSSION AREA NEAR 2N137W. AS A 
RESULT...BROAD ANTICYCLONIC FLOW IS EVIDENT S OF 16N AND W OF 
120W.

SURFACE RIDGE EXTENDS FROM 32N137W TO 26N128W TO 21N118W. HIGH 
PRES COVERS THE AREA N OF 20N W OF 125W. BROKEN/OVERCAST 
STRATOCUMULUS CLOUDS COVERS THE AREA N OF 20N W OF 115W. WEAK 
SURFACE TROUGH IS ANALYZED ALONG THE ITCZ FROM 14N-8N ALONG 
130W. ISOLATED SHOWERS ARE ALONG THE TROUGH.

$$
DGS