000
AXPZ20 KNHC 260306
TWDEP 

TROPICAL WEATHER DISCUSSION      
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC THU JUL 26 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 
0315 UTC.

...SPECIAL FEATURE...
TROPICAL STORM DALILA AT 20.4N 112.5W AT 26/0300 UTC MOVING NW 
AT 7 KT. MAXIMUM SUSTAINED WIND SPEED 40 GUSTS TO 50 KT.  
ESTIMATED MINIMUM CENTRAL PRESSURE IS 1000 MB. DALILA CONTINUES 
TO MAINTAIN DEEP CONVECTION...BOTH IN BANDS SOUTH OF THE CENTER 
AND NOW OVER THE CENTER. THIS TROPICAL CYCLONE WILL BE CROSSING 
THE 26C ISOTHERM WITHIN ANOTHER 12 HOURS OR SO...AND THE LARGE 
CIRCULATION SHOULD SLOWLY SPIN DOWN OVER COOLER WATERS. 
SCATTERED MODERATE/ISOLATED STRONG CONVECTION IS WITHIN 130 NM S 
SEMICIRCLE...AND WITHIN 60 NM N AND NE OF CENTER. SEE LATEST NHC 
FORECAST/ADVISORY UNDER AWIPS/WMO HEADERS MIATCMEP2/WTPZ22 KNHC 
FOR MORE DETAILS.

...TROPICAL WAVES...
TROPICAL WAVE ALONG 90W N OF 5N MOVING W 10 TO 15 KT. THE WAVE 
IS MOVING ACROSS THE YUCATAN PENINSULA AND GUATEMALA GENERATING 
SCATTERED SHOWERS AMD TSTMS. CLUSTERS OF MODERATE CONVECTION ARE 
ON THE SOUTHERN END OF THE WAVE MAINLY WITHIN THE ITCZ FROM 5N 
TO 8N BETWEEN 86W AND 91W. NO ORGANIZATION OR SIGNS OF 
DEVELOPMENT ASSOCIATED WITH THIS FEATURE.  

TROPICAL WAVE EXTENDS ALONG 101W/102W N OF 5N MOVING W 10 TO 15 
KT. CONVECTION HAS DIMINISHED ALONG THE WAVE AXIS DURING THE 
LAST FEW HOURS. NO ORGANIZATION OR SIGNS OF DEVELOPMENT 
ASSOCIATED WITH WAVE.  

...ITCZ...
ITCZ AXIS ALONG...8N78W 10N85W 7N95W 9N107W 13N114W 11N140W. 
CLUSTERS OF MODERATE/ISOLATED STRONG CONVECTION OVER THE GULF OF 
PANAMA. SCATTERED MODERATE/ISOLATED STRONG FROM 5N TO 8N BETWEEN 
86W AND 91W. 

...DISCUSSION...
AN UPPER LEVEL ANTICYCLONE LOCATED OVER ARIZONA EXTENDS A RIDGE 
SW TO THE ITCZ W OF 130W WITH VERY DRY AIR RESULTING IN STRONG 
SUBSIDENCE N OF 17N W OF 120W. TROPICAL STORM DALILA IS MOVING 
ALONG THE PERIPHERY OF THIS RIDGE. 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 THE EPAC ACROSS CENTRAL AMERICA. AN INVERTED TROUGH LIES 
ALONG 103W/104W N OF 10N. 

AT THE SURFACE...HIGH PRES LOCATED N OF AREA EXTENDS A RIDGE 
THAT REACHES 20N125W. MODERATE TRADE WINDS AND LOW/MID CLOUDS 
ARE FOUND UNDER THE INFLUENCE OF THIS SYSTEM. A COUPLE OF 
TROPICAL WAVES ARE MOVING ACROSS THE BASIN. SEE ABOVE. 
CONVECTION HAS FLARED UP ALONG THE SIERRA MADRE MOUNTAINS. A 
DIFFLUENT PATTERN ALOFT IS HELPING TO GENERATE THIS CONVECTIVE 
ACTIVITY.  
 
$$
GR