SEL9
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 619
   NWS STORM PREDICTION CENTER NORMAN OK
   1055 AM CDT TUE JUL 13 2004
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          EASTERN IOWA
          NORTHERN AND CENTRAL ILLINOIS
   
   EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 1055 AM UNTIL
   500 PM 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 85 STATUTE MILES EAST AND WEST
   OF A LINE FROM 30 MILES EAST NORTHEAST OF DUBUQUE IOWA TO 15 MILES
   SOUTHWEST OF BLOOMINGTON ILLINOIS.
   
   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.
   
   DISCUSSION...EXTREME INSTABILITY ERN IA SPREADING INTO IL AHEAD OF
   VIGOROUS UPPER TROUGH.  RAPID SEVERE THUNDERSTORM DEVELOPMENT WILL
   OCCUR AHEAD OF COLD FRONT ACROSS NERN IA/NWRN IL. 40-50KT OF DEEP
   LAYER SHEAR COUPLED WITH MUCAPES ABOVE 5000 J/KG WILL SUPPORT
   SUPERCELLS WHICH WILL ENHANCE LARGE HAIL AND TORNADO THREAT.
   
   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