SPC MESOSCALE DISCUSSION 1766 FOR SRN WI/ERN IA/NWRN IL...
   CONCERNING...SEVERE THUNDERSTORM WATCH 627...
   
   VALID 212256Z - 220100Z
   
   THROUGH 0100Z...TORNADO THREAT IS POSSIBLE IN A TWO COUNTY WIDE
   SWATH FROM MARQUETTE AND COLUMBIA COUNTIES TO MANITOWOC AND
   SHEBOYGAN COUNTIES IN WISCONSIN.  DAMAGING WIND THREAT WILL
   CONTINUE ALONG SQUALL LINE FARTHER SOUTH. 
   
   LATEST DATA INDICATES WEST-EAST FRONT FROM NORTHERN MANITOWOC
   WISCONSIN TO SOUTHERN ADAMS COUNTY...WHERE NORTH SOUTH SQUALL LINE
   INTERSECTS THE FRONT.  BEST COMBINATION OF LOW LEVEL
   SHEAR/INSTABILITY/LOW LCL HEIGHTS WAS IN THE VICINITY OF MARQUETTE
   COUNTY WISCONSIN.  BOWING SEGMENT MOVING 260/40 KNOTS MOVING INTO
   COLUMBIA COUNTY HAS SHOWN INCREASING ROTATION IN THE PAST 30
   MINUTES AS IT ENCOUNTERS MORE FAVORABLE ENVIRONMENT...AND MAY
   PRODUCE A TORNADO OVER THE NEXT TWO HOURS. 
   
   IN ADDITION...MORE ISOLATED CELL ALONG WEST-EAST FRONT IN FON-DU-
   LAC AND SOUTHERN CALUMET COUNTY HAS ALSO DEVELOPED ROTATION AND HAS
   TORNADO POTENTIAL FOR THE NEXT HOUR OR SO BEFORE MOVING OFFSHORE. 
   
   ..CRAVEN.. 08/21/02