SEL2
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 682
   NWS STORM PREDICTION CENTER NORMAN OK
   745 PM CDT SUN AUG 1 2004
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          CENTRAL AND EASTERN SOUTH DAKOTA
   
   EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 745 PM UNTIL
   200 AM CDT.
   
   TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
   TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE TORNADO WATCH AREA IS ALONG AND 65 STATUTE MILES NORTH AND
   SOUTH OF A LINE FROM 55 MILES SOUTHWEST OF MOBRIDGE SOUTH DAKOTA
   TO 30 MILES EAST OF WATERTOWN SOUTH DAKOTA.
   
   REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
   TORNADOES AND 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.
   
   OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO
   WATCH NUMBER 678...SEVERE THUNDERSTORM WATCH NUMBER 681. WATCH
   NUMBER 678 681 WILL NOT BE IN EFFECT AFTER 745 PM CDT.
   CONTINUE...WW 679...WW 680...
   
   DISCUSSION...RAPIDLY INTENSIFYING SEVERE THUNDERSTORMS OVER NCENTRAL
   SD EXPECTED TO MOVE  E/SE INTO A VERY UNSTABLE AIR MASS.  WITH
   STRONG VEERING SHEAR PROFILES NOTED ON 00Z ABR SOUNDING...CONDITIONS
   NOW FAVORABLE FOR TORNADIC SUPERCELLS. ADDITIONALLY WITH MLCAPES TO
   4000 J/KG ERN SD...VERY LARGE HAIL AND DAMAGING DOWNBURST WINDS ARE
   LIKELY.
   
   AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
   SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND
   GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600.
   MEAN STORM MOTION VECTOR 30030.
   
   
   ...HALES