000
AXPZ20 KNHC 180907
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC THU SEP 18 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 N OF 3N ALONG 86W MOVING W 10 KT. NUMEROUS 
MODERATE TO STRONG CONVECTION OVER THE PACIFIC N OF 8N BETWEEN 
86W AND 91W AND ACROSS NICARAGUA AND HONDURAS.

TROPICAL WAVE N OF 3N ALONG 99W MOVING W 15 KT. SCATTERED 
MODERATE TO STRONG CONVECTION FROM 8N-12N BETWEEN 94W-100W.

TROPICAL WAVE FROM 5N-16N ALONG 118W MOVING W 10 KT. ISOLATED 
SHOWERS N OF 9N ALONG THE WAVE.

...ITCZ...
ITCZ AXIS FROM 11N86W 9N95W 11N115W 10N125W 11N140W. NUMEROUS 
MODERATE TO STRONG CONVECTION FROM 8N-13N BETWEEN 86W-91W. 
SCATTERED MODERATE TO STRONG FROM 8N-12N BETWEEN 94W-100W.

...DISCUSSION...
MID TO UPPER LEVEL TROUGH MOVING ACROSS THE FAR NORTHWESTERN 
CORNER OF THE DISCUSSION FROM 32N128W TO 27N140W. DOWNSTREAM 
UPPER LEVEL RIDGE EXTEND FROM AN ANTICYCLONIC CIRCULATION NEAR 
22N117W N TO THE NORTHERN BAJA PENINSULA INTO SOUTHERN 
CALIFORNIA. STRONG SUBSIDENCE WITH DRY STABLE CONDITIONS COVER 
THE AREA N OF 20N W OF 110W. A WEAK TROUGH FROM SOUTHERN NEW 
MEXICO ACROSS NW MEXICO SEPARATES THE PACIFIC ANTICYCLONIC 
CIRCULATION FROM ANOTHER ANTICYCLONIC CIRCULATION OVER CENTRAL 
MEXICO NEAR 21N98W. DIFFLUENT FLOW S OF THE ANTICYCLONE IS 
ENHANCING CONVECTIVE ACTIVITY ACROSS CENTRAL AMERICA AND INTO 
THE PACIFIC N OF 5N E OF 100W.

SURFACE RIDGE EXTENDS FROM A 1020 MB HIGH PRES CENTER NEAR 
29N129W TO 18N111W. BROKEN/OVERCAST STRATOCUMULUS CLOUDS COVER 
THE AREA FROM 20N-30N BETWEEN 120W AND 130W. SURFACE TROUGH IS 
ANALYZED ALONG THE ITCZ FROM 8N-16N ALONG 132W. ISOLATED SHOWERS 
ARE ALONG THE TROUGH.

$$
DGS