Wow!
Mesoscale Discussion 989 
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   MESOSCALE DISCUSSION 0989
   NWS STORM PREDICTION CENTER NORMAN OK
   0234 PM CDT MON JUN 08 2009   
   AREAS AFFECTED...LOWER MI/NORTHERN INDIANA   
   CONCERNING...SEVERE POTENTIAL...WATCH LIKELY    
 
      VALID 081934Z - 082030Z   
   SEVERE TSTM THREAT MAY INCREASE THE REMAINDER OF THE AFTERNOON
   ACROSS LOWER MI/PERHAPS NORTHERN INDIANA. A WATCH COULD BE NEEDED
   SOON...AT LEAST FOR PORTIONS OF LOWER MI.   
   A SUPERCELL HAS RECENTLY DEVELOPED/QUICKLY GONE SEVERE IN VICINITY
   OF LANSING MI AS OF 1930Z...WITH THE POSSIBILITY OF ADDITIONAL
   DEVELOPMENT OCCURRING ACROSS SOUTHWEST LOWER MI PER MOST RECENT
   VISIBLE SATELLITE IMAGERY. THIS ACTIVITY IS IN CLOSE PROXIMITY TO A
   WARM FRONT THAT IS RETREATING NORTHWARD ACROSS LOWER MI THIS
   AFTERNOON AHEAD OF UPSTREAM SURFACE LOW ACROSS SOUTHERN WI AND
   ASSOCIATED COLD FRONT. HAIL/DAMAGING WINDS WILL BE POSSIBLE...AND
   FAVORABLE LOW LEVEL HODOGRAPHS IN VICINITY OF THE WEST-EAST WARM
   FRONT ACROSS LOWER MI /PER GRAND RAPIDS AND DETROIT WSR-88D VWP
   DATA/ SUGGEST A TORNADO OR TWO MAY BE POSSIBLE AS WELL.