000
AXPZ20 KNHC 310324
TWDEP 

TROPICAL WEATHER DISCUSSION      
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC TUE JUL 31 2007

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

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0300 UTC.

...TROPICAL WAVES...

A TROPICAL WAVE IS ALONG 99W N OF 4N MOVING W 15 KT. WEAK 
CYCLONIC TURNING IS NOTED ALONG THE WAVE AT 9N. CONVECTION HAS 
DIMINISHED.

LOW 13N120W 1008 MB IS ASSOCIATED WITH A TROPICAL WAVE ALONG 
120W FROM 5N TO 19N MOVING W 12 KT. SCATTERED MODERATE TO STRONG 
CONVECTION IS OBSERVED WITHIN 180 NM OF THE CENTER OVER THE WEST 
SEMICIRCLE. UPPER LEVEL EASTERLY SHEAR IS EXPECTED TO CONTINUE 
SUPPRESSING FURTHER DEVELOPMENT.

...ITCZ...

ITCZ AXIS IS ALONG THE LINE...7N77W 7N90W 12N110W 12N120W 
11N130W 8N140W.
SCATTERED MODERATE WITH ISOLATED STRONG CONVECTION IS WITHIN 75 
NM OF THE POINT 11.1N97.3W. SCATTERED MODERATE TO STRONG 
CONVECTION IS WITHIN 90 NM OF 11.7N107W.

...DISCUSSION...

UPPER LEVEL TROUGH ALONG LINE 32N123W TO 15N140W. NO WEATHER OR 
CLOUDS ARE ASSOCIATED WITH THE SYSTEM. DRY AIR IS OBSERVED IN 
THE LOWER AND MIDDLE LEVELS NW OF THE AXIS AND 300 NM SE OF AXIS.

MIDDLE AND UPPER TROUGH IS NORTH OF 15N FROM 108W TO 115W. THIS 
AREA ALSO HAS NO ASSOCIATED WEATHER OR CLOUDS AND IS DRY IN THE 
MIDDLE AND UPPER LEVELS.

ELSEWHERE WEAK ANTICYCLONIC FLOW PREVAILS. 

WEAK SURFACE RIDGE IS NORTH OF THE ITCZ WEST OF 125W.  ELSEWHERE 
WEAK TROUGH IS OBSERVED.

$$
LL