MESOSCALE DISCUSSION 1368 NWS STORM PREDICTION CENTER NORMAN OK 1153 AM EDT WED JUL 10 2013 AREAS AFFECTED...NRN IND...NW OH AND SRN LOWER MI CONCERNING...SEVERE POTENTIAL...WATCH LIKELY VALID 101553Z - 101700Z PROBABILITY OF WATCH ISSUANCE...80 PERCENT SUMMARY...A SEVERE THREAT IS EX