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   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 517
   NWS STORM PREDICTION CENTER NORMAN OK
   1130 PM EDT WED JUN 23 2004
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          LOWER MICHIGAN
          LAKE MICHIGAN
          LAKE ERIE
          LAKE HURON
   
   EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 1130 PM
   UNTIL 500 AM EDT.
   
   HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
   MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 90 STATUTE MILES
   NORTH AND SOUTH OF A LINE FROM 10 MILES SOUTH OF MUSKEGON MICHIGAN
   TO 50 MILES NORTH NORTHEAST OF MOUNT CLEMENS MICHIGAN.
   
   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...THIS SEVERE THUNDERSTORM WATCH REPLACES
   SEVERE THUNDERSTORM WATCH NUMBER 515...SEVERE THUNDERSTORM WATCH
   NUMBER 516. WATCH NUMBER 515 516 WILL NOT BE IN EFFECT AFTER 1130
   PM EDT. 
   
   DISCUSSION...SEVERE THUNDERSTORMS WILL CONTINUE EWD ACROSS LM AS
   POWERFUL MID LEVEL JET CONTINUES EWD TOWARD WRN GREAT LAKES. 
   SUFFICIENT INSTABILITY TO MAINTAIN THREAT OF DAMAGING
   WINDS...PARTICULARLY ASSOCIATED WITH SHORT LINES/BOWS.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
   MOTION VECTOR 27045.
   
   
   ...HALES