000
AXPZ20 KNHC 252158
TWDEP 

TROPICAL WEATHER DISCUSSION      
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC WED JUL 25 2007

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 
2115 UTC.

...SPECIAL FEATURE...
TROPICAL STORM DALILA AT 20.1N 112.4W AT 25/2100 UTC MOVING NW 
AT 8 KT. MAXIMUM SUSTAINED WIND SPEED 40 GUSTS TO 50 KT.  
ESTIMATED MINIMUM CENTRAL PRESSURE IS 1002 MB. DALILA IS WINDING 
DOWN FASTER THAN ANTICIPATED YESTERDAY. IT WILL CONTINUE MOVING 
NORTHWEST TOMORROW AND WILL CROSS THE 26C SST ISOTHERM. ANY 
REMAINING CONVECTION WILL LIKELY FIZZLE AT THAT POINT AND THE 
CYCLONE SHOULD BECOME A REMNANT LOW IN ABOUT TWO DAYS. SCATTERED 
MODERATE ISOLATED STRONG CONVECTION IS WITHIN 120 NM S 
SEMICIRCLE. SEE LATEST NHC FORECAST/ADVISORY UNDER AWIPS/WMO 
HEADERS MIATCMEP2/WTPZ22 KNHC FOR MORE DETAILS.

...TROPICAL WAVES...
TROPICAL WAVE ALONG 89W N OF 5N MOVING W 10 TO 15 KT. SCATTERED  
MODERATE CONVECTION MAINLY WITHIN THE ITCZ. THE WAVE IS 
GENERATING SOME SHOWER ACTIVITY OVER CENTRAL AMERICA. NO 
ORGANIZATION OR SIGNS OF DEVELOPMENT ASSOCIATED WITH WAVE.  

TROPICAL WAVE EXTENDS ALONG 100W/101W N OF 5N MOVING W 15 KT.  
SCATTERED CONVECTION WITHIN 60 NM OF AXIS BETWEEN 6N AND 10N.   
NO ORGANIZATION OR SIGNS OF DEVELOPMENT ASSOCIATED WITH WAVE.  

...ITCZ...
ITCZ AXIS ALONG...8N80W 7N95W 13N115W 11N140W. SCATTERED 
MODERATE ISOLATED STRONG FROM 5N TO 8N BETWEEN 85W AND 97W...AND 
FROM 6N TO 10N BETWEEN 100W AND 103W. 

...DISCUSSION...
AN UPPER ANTICYCLONE LOCATED OVER ARIZONA EXTEND A RIDGE SW TO 
THE ITCZ W OF 130W MAINTAINING VERY DRY AIR MASS N OF 17N W OF 
120W. THIS RIDGE IS ALSO LOCATED NORTH OF TROPICAL STORM DALILA. 
AN UPPER LEVEL TROUGH IS JUST OFF THE NW CORNER OF THE AREA.  
ANOTHER UPPER LEVEL ANTICYCLONE IS OVER THE YUCATAN CHANNEL 
PRODUCING A STEADY FLOW OF MOISTURE INTO E PAC ACROSS CENTRAL 
AMERICA.  

AT THE SURFACE...HIGH PRES LOCATED N OF AREA EXTENDS A RIDGE 
THAT REACHES 20N125W. MODERATE TRADE WINDS AND LOW TO MID CLOUDS 
ARE FOUND UNDER THE INFLUENCE OF THIS SYSTEM. A COUPLE OF 
TROPICAL WAVES ARE MOVING ACROSS THE BASIN. SEE ABOVE.
 
$$
GR