MESOSCALE DISCUSSION 0560
   NWS STORM PREDICTION CENTER NORMAN OK
   1206 PM CDT SAT APR 25 2009
   
   AREAS AFFECTED...LOWER MI
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 181...
   
   VALID 251706Z - 251830Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 181
   CONTINUES.
   
   LEADING BAND OF THUNDERSTORMS HAS INCREASED IN INTENSITY...
   PARTICULARLY THE SOUTHERN EXTENT WITH EVOLUTION INTO A BOW ECHO. 
   WIND GUSTS TO 46 KTS WAS OBSERVED IN KALAMAZOO WITH THE LINE BEFORE
   IT BECAME ORGANIZED.  EXTRAPOLATION HAS STORMS ARRIVING IN THE
   DETROIT METRO AREA 18-1830Z.  DAMAGING WINDS AND HAIL CAN BE
   EXPECTED AS THE LINE EXITS THE EASTERN END OF THE SEVERE
   THUNDERSTORM WATCH 18-19Z.
   
   UPSTREAM...THIN SPOTS IN THE MID-HIGH LEVEL CLOUD CANOPY HAS
   MAINTAINED A SOMEWHAT UNSTABLE PROFILE...PARTICULARLY SOUTHWEST
   LOWER MI NWD TOWARD MOUNT PLEASANT. UPSTREAM THUNDERSTORMS REMAIN
   STRONG AND COULD POSE A LARGE HAIL/DAMAGING WIND THREAT ACROSS THESE
   AREAS THROUGH MID-AFTERNOON.
   
   ..RACY.. 04/25/2009
   
   
   ATTN...WFO...DTX...APX...GRR...
   
   LAT...LON   42948607 44428445 44798262 43318128 42148303 42278614
               42948607