MESOSCALE DISCUSSION 0841
   NWS STORM PREDICTION CENTER NORMAN OK
   0814 PM CDT FRI MAY 15 2009
   
   AREAS AFFECTED...PARTS OF CENTRAL AND SRN IL...MUCH OF INDIANA...AND
   W CENTRAL AND SWRN OH
   
   CONCERNING...TORNADO WATCH 306...309...
   
   VALID 160114Z - 160315Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 306...309...CONTINUES.
   
   STRONG/SEVERE STORMS CONTINUE MOVING ACROSS WW 305 AND 309.  AS
   STORMS BEGIN MOVING INTO SERN IL -- OUT OF WW 305 -- A NEW WATCH MAY
   BE REQUIRED FOR SERN IL/SRN INDIANA.
   
   MODERATE INSTABILITY CONTINUES ACROSS MUCH OF INDIANA AND IL NEAR
   AND S OF THE WARM FRONT...AND SOUTHEAST OF THE MAIN CONVECTIVE BAND
   NOW EXTENDING FROM NWRN INDIANA SWWD TO NEAR STL.  STORMS REMAIN
   FAIRLY WELL-ORGANIZED...AIDED BY AMPLE DEEP-LAYER SHEAR ACROSS THIS
   REGION.  THOUGH FLOW WEAKENS WITH SWD EXTENT TOWARD THE OH
   RIVER...ORGANIZED NATURE OF THE ONGOING STORMS NOW CROSSING IL
   SUGGESTS THAT SOME SEVERE THREAT WILL SPREAD SEWD OUT OF WW 306 INTO
   SERN IL -- AND EVENTUALLY INTO SRN INDIANA.  NEW WW MAY BE NEEDED
   BEFORE 16/02Z -- WHILE THREAT CONTINUES ACROSS EXISTING PORTIONS OF
   WW 305 AND 309.
   
   ..GOSS.. 05/16/2009
   
   
   ATTN...WFO...CLE...ILN...LMK...IWX...IND...PAH...LOT...ILX...
   LSX...
   
   LAT...LON   37978789 38649049 40878741 41238543 40728334 39288387
               38158603 37978789