A tornado watch is out until 9pm EDT for a large part of the Ohio Valley.
Strong thunderstorms are already developing between the Ohio River and Interstate 70 as indicated on AccuWeather radar:
People in the watch should keep up on the weather the rest of the day.
UPDATE 6pm: While only one damaging tornado so far (red), more than 180 reports of damaging winds and large (≥1″) hail. Compare to the outline of the tornado watch. Quite accurate.