000
AXPZ20 KNHC 312126
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC THU JUL 31 2008

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

BASED ON 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2100 UTC.

...TROPICAL WAVES... 

A TROPICAL WAVE LOCATED N OF 05N ALONG 87W MOVE W 15 TO 20 KT.  
NO ORGANIZED CONVECTION IS ASSOCIATED WITH THIS FEATURE. 

A TROPICAL WAVE IS ANALYZED TO THE N OF 03N ALONG 108W MOVE W 
12 KT OVER THE PAST 24 HOURS. A LOW PRESSURE 1009 MB IS ANALYZED 
NEAR 09N ALONG THE AXIS WITH CYCLONIC TURNING NOTED IN THE 
VISIBLE IMAGERY. SCATTERED MODERATE WITH ISOLATED STRONG 
CONVECTION IS WITHIN ABOUT 90 NM OF 09N106W. THIS LOW PRES 
IS EXPECTED TO DISSIPATE TONIGHT. 

...ITCZ...

THE ITCZ AXIS FLUCTUATES BETWEEN 08N AND 10N ACROSS THE E 
PACIFIC TO THE E OF 140W. ISOLATED MODERATE CLUSTERS OF 
CONVECTION ARE NOTED FROM 04N TO 11N TO THE E OF 133W. 

...DISCUSSION...

MAINLY UPPER LEVEL CYCLONIC CIRCULATION IS NOTED NEAR 30N124W 
AND IS EMBEDDED IN A TROUGH WHICH IS NORTH OF THE ITCZ FROM 118W 
TO 132W. THE AREA IS DRY AND CLOUD FREE IN THE MIDDLE AND UPPER 
LEVELS WITH OVERCAST STRATOCUMULUS NORTH OF 17N IN THE LOWER 
LEVELS. THE CIRCULATION CENTER IS MOVING NORTH AND WILL PASS 
NORTH OF 32N TONIGHT AND THE TROUGH WILL GRADUALLY WEAK DURING 
THE NEXT 48 HOURS. WEST OF THIS SYSTEM WEAK ANTICYCLONIC FLOW IS 
NOTED. THIS AREA IS VERY DRY IN THE MIDDLE AND UPPER LEVELS WITH 
MODERATE TO STRONG MIDDLE AND UPPER LEVEL SUBSIDENCE. BROKEN TO 
OVERCAST STRATOCUMULUS IS OBSERVED NORTH OF 20N IN THE LOWER 
LEVELS.

ANTICYCLONIC FLOW IS NOTED EAST OF THE ABOVE MENTIONED TROUGH 
WITH WIDESPREAD MULTI LEVEL CLOUDINESS AND EMBEDDED AREAS OF 
CONVECTION.

AT THE SURFACE WEAK RIDGE IS NORTH OF 18N WEST OF 110W. 
ELSEWHERE BROAD TROUGH IS ANALYZED.

$$
LL