MESOSCALE DISCUSSION 0912
   NWS STORM PREDICTION CENTER NORMAN OK
   0600 PM CDT FRI MAY 31 2013

   AREAS AFFECTED...NRN IND

   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 

   VALID 312300Z - 010000Z

   PROBABILITY OF WATCH ISSUANCE...40 PERCENT

   SUMMARY...STORMS MAY CONTINUE TO POSE A THREAT FOR ISOLATED DAMAGING
   WIND AND LARGE HAIL THROUGH MUCH OF NRN IND. A WW MAY BE NEEDED
   SOON.

   DISCUSSION...CLUSTER OF STORMS OVER NERN IL HAS EVOLVED INTO A SMALL
   BOW ECHO ALONG ERN FRINGE OF AN ENVIRONMENT WHERE VERTICAL SHEAR AND
   INSTABILITY SUPPORT ORGANIZED STORM STRUCTURES. WHILE THE ATMOSPHERE
   DOWNSTREAM IS NOT QUITE AS FAVORABLE...IT MAY BE SUFFICIENT TO
   SUPPORT A THREAT FOR ISOLATED DAMAGING WIND AND HAIL NEXT FEW HOURS.

   ..DIAL/KERR.. 05/31/2013


   ATTN...WFO...IWX...

   LAT...LON   41218692 41588617 41568503 40598550 41218692