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   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 647
   NWS STORM PREDICTION CENTER NORMAN OK
   1210 PM CDT FRI JUL 16 2004
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          EASTERN IOWA
          NORTHERN ILLINOIS
          NORTHWEST INDIANA
          LAKE MICHIGAN
   
   EFFECTIVE THIS FRIDAY AFTERNOON FROM 1210 PM UNTIL 500 PM CDT.
   
   HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
   MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 75 STATUTE MILES
   EITHER SIDE OF A LINE FROM 40 MILES SOUTHEAST OF SOUTH BEND
   INDIANA TO 35 MILES SOUTHWEST OF CEDAR RAPIDS IOWA.
   
   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 646...
   
   DISCUSSION...THUNDERSTORMS WILL CONTINUE TO INCREASE ACROSS WATCH
   AREA WHERE AIR MASS HAS BECOME STRONGLY UNSTABLE AND UNCAPPED. 
   VEERING SHEAR PROFILE SUPPORT STORMS EVOLVING INTO SHORT LINE
   SEGMENTS ENHANCING WIND DAMAGE POTENTIAL
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
   MOTION VECTOR 33025.
   
   
   ...HALES