000
AXPZ20 KNHC 281515
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC SUN OCT 28 2007

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

BASED ON 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 1500 UTC.

...ITCZ....
AXIS ALONG 9N83W 7N95W 10N115W 11N140W. ISOLATED CONVECTION 
WITHIN 60 NM S OF AXIS FROM 100W-104W AND WITHIN 60 NM N OF AXIS 
FROM 112W-119W.

...DISCUSSION...
POSITIVELY TILTED MID/UPPER LEVEL TROUGH EXTENDS FROM A 
MID/UPPER LEVEL CYCLONIC CIRCULATION NEAR 32N131W SWWD
TO ANOTHER CYCLONIC CIRCULATION NEAR 21N140W. A FEW SHOWERS ARE 
NOTED NEAR THE SECOND CYCLONIC CIRCULATION OTHERWISE STRONG 
SUBSIDENCE ELSEWHERE WITHIN THE TROUGH AXIS. MID TO UPPER LEVEL 
MOISTURE IS BEING ADVECTED NE WITHIN 500 NM SE OF THE TROUGH  
WITH MODERATE SUBSIDENCE NOTED OVER MOST OF THE REMAINDER OF THE 
AREA N OF 15N. DOWNSTREAM RIDGE EXTENDS FROM SRN ARIZONA ACROSS 
NW MEXICO TO A WEAK ANTICYCLONE NEAR 18N107W.
 
MID TO UPPER LEVEL TROUGH EXTENDS FROM SE TEXAS SWD ACROSS THE 
WRN GULF OF MEXICO THEN INTO MEXICO TO A BASE NEAR ACAPULCO.  
VERY STRONG SUBSIDENCE WAS NOTED ACROSS MEXICO INTO PACIFIC 
SUPPRESSING ITCZ CONVECTION.

WEAK SURFACE TROUGH FROM 24N124W TO 19N123W...NO SIGNIFICANT 
WEATHER ASSOCIATED WITH THE TROUGH. ANOTHER TROUGH WITH AXIS 
FROM 23N137W TO 14N137W. SCATTERED SHOWERS ARE WITHIN 100 NM E 
OF TROUGH FROM 14N-18N. STRONG HIGH PRES RIDGE ACROSS MEXICO
IS PRODUCING GALE FORCE WINDS INTO THE GULF OF TEHUANTEPEC.

$$
DGS