

530 

WWUS20 KWNS 012206

SEL8

SPC WW 012206

ILZ000-INZ000-KYZ000-020500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 788

NWS STORM PREDICTION CENTER NORMAN OK

505 PM CDT FRI AUG 1 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHERN ILLINOIS

       SOUTHERN INDIANA

       NORTHERN AND WESTERN KENTUCKY



EFFECTIVE THIS FRIDAY AFTERNOON FROM 505 PM UNTIL MIDNIGHT CDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 10 MILES NORTHWEST

OF ALTON ILLINOIS TO 20 MILES EAST NORTHEAST OF LOUISVILLE

KENTUCKY.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH

AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR

THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS

AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...CONTINUE...WW 785...WW 786...WW 787...



DISCUSSION...TSTMS NOW FORMING ON SRN-MOST OF TWO LOW-LVL CONFLUENCE

FEATURES ACROSS CNTRL IL/SW IND EXPECTED TO CONTINUE INTENSIFYING AS

STORMS INGEST STRONGLY HEATED MOIST AIR FARTHER S.  INCREASING DEEP

NWLY SHEAR AND ASCENT WITH UPR IMPULSE NOW IN ERN IA/WRN IL MAY

SUPPORT SUSTAINED STORMS/SUPERCELLS WITH BOWING SEGMENTS THAT YIELD

HIGH WIND/HAIL AND POSSIBLY A TORNADO.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 30025.





...CORFIDI

