MESOSCALE DISCUSSION 0822
   NWS STORM PREDICTION CENTER NORMAN OK
   1017 PM CDT WED MAY 13 2009
   
   AREAS AFFECTED...CENTRAL AND NERN IL/W CENTRAL AND NWRN INDIANA/SWRN
   LOWER MI
   
   CONCERNING...TORNADO WATCH 297...
   
   VALID 140317Z - 140415Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 297 CONTINUES.
   
   SEVERE/ISOLATED TORNADO THREAT CONTINUES ACROSS PARTS OF WW
   297...WHILE SOME INCREASE IN SEVERE POTENTIAL WITH TIME EWD INTO
   SWRN LOWER MI/NWRN INDIANA MAY WARRANT ADDITIONAL WW ISSUANCE.
   
   STORMS CONTINUE MOVING EWD ACROSS NWRN IL AND THE LK MI AREA
   ATTM...AHEAD OF THE ADVANCING COLD FRONT.  STORMS HAVE WEAKENED
   SLOWLY OVER THE PAST COUPLE OF HOURS...AS AIRMASS HAS BEGUN SLOWLY
   STABILIZING WITH THE LOSS OF DAYTIME HEATING.  HOWEVER...WITH AMPLE
   INSTABILITY TO SUPPORT A CONTINUATION OF CONVECTION E/NE OF WW
   297...EXPECT STORMS TO CONTINUE SPREADING ACROSS NERN IL/NWRN
   INDIANA/SWRN LOWER MI OVER THE NEXT FEW HOURS.  WHILE INSTABILITY
   WILL REMAIN LIMITED...STRONG SHEAR MAY ALLOW A FEW
   STRONGER/ORGANIZED STORMS TO PRODUCE LOCALLY-DAMAGING GUSTS AND/OR
   MARGINAL HAIL -- OR EVEN AN ISOLATED/BRIEF TORNADO.  DEGREE OF
   THREAT -- WHILE LIKELY TO REMAIN LIMITED E OF WW 297 -- COULD
   REQUIRE NEW WW ISSUANCE...PARTICULARLY WITH WW 297 SCHEDULED TO
   EXPIRE AT THE TOP OF THE HOUR.
   
   ..GOSS.. 05/14/2009
   
   
   ATTN...WFO...IWX...GRR...IND...LOT...ILX...MKX...DVN...
   
   LAT...LON   39638967 40718995 42168900 42538760 42778658 43998586
               43638487 42118484 39548684 39638967