000
AXPZ20 KNHC 281557
TWDEP 

TROPICAL WEATHER DISCUSSION      
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC SAT JUL 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 
1545 UTC.

...TROPICAL WAVES...
TROPICAL WAVE ALONG 83W N OF 5N HAS MOVED W 12 KT THE PAST 24 
HOURS. WEAK CYCLONIC TURNING IS NOTED NEAR 7N83W WHERE SCATTERED 
MODERATE ISOLATED STRONG CONVECTION IS NOTED.

TROPICAL WAVE IS ALONG 109W FROM 5N TO 16N AND HAS MOVED W 12 KT 
OVER THE PAST 24 HOURS. CYCLONIC TURNING IS NOTED NEAR 10N109W 
ESTIMATED AT 1009 MB. ASSOCIATED SCATTERED SHOWERS AND ISOLATED 
TSTMS ARE NOTED WITHIN 120 NM OF 9N113W. UPPER CONDITIONS ARE 
CURRENTLY NOT FAVORABLE FOR DEVELOPMENT. 

...ITCZ...
ITCZ AXIS ALONG 9N83W 9N90W 12N110W 7N116W 10N130W 8N140W. 
SCATTERED MODERATE WITHIN 30 NM OF 7N83W AND WITHIN 120 NM OF 
LINE 9N96W 12N102W 9N114W. 

...DISCUSSION...
A SERIES OF UPPER TROUGHS DOMINATE THE NW PORTION. THE FIRST IS 
JUST NW OF AREA ALONG 34N137W 29N143W. THE SECOND IS ALONG 
32N119W THROUGH AN UPPER CYCLONE AT 27N132W TO NEAR 18N132W. 
SOME UPPER MOISTURE IS NOTED WITHIN 120 NM OF 26N135W. AN UPPER 
ANTICYCLONE IS AT 17N14W WITH A RIDGE NE TO NEAR 26N137W AND 
ANOTHER NEAR 21N107W RIDGING SW TO NEAR 13N121W. CONVECTION IS 
ENHANCED UNDER THE RIDGE...WITHIN 180 NM EITHER SIDE OF LINE 
19N100W 9N116W WHERE THE DEBRIS MOISTURE IS ALSO CONTAINED.
OTHERWISE...THE UPPER LEVELS ARE DRY OVER THE DISCUSSION AREA W 
OF 110W.

AN UPPER TROUGH EXTENDS SW FROM NEAR BERMUDA ACROSS E CUBA AND 
CENTRAL AMERICA TO NEAR 3N103W. AN UPPER ANTICYCLONE IS NEAR 
12N72W RIDGING W TO NEAR 12N83W. CONVECTION IS ENHANCED UNDER 
THE RIDGE WITH DEBRIS MOISTURE NOTED NE OF LINE 1N79W 11N90W. 

THE REMNANT LOW PRES OF DELILA IS STILL SPINNING NEAR 24N121W 
AND IS EXPECTED TO FURTHER WEAKEN TO AN OPEN TROUGH IN ABOUT 24 
HOURS. WEAKENING HIGH PRES IS NEAR 19N11W. 

$$
NELSON