UPDATE: Mercer County now under severe thunderstorm warning, tornado warning lifted


May 23, 2011 at 10:49p.m.

The National Weather Service out of Pittsburgh reports a severe thunderstorm watch is in effect in Lawrence, Mercer, Butler, Venango and Crawford counties in Pennsylvania until 2 a.m. Tuesday.

A tornado watch for Mercer County was lifted shortly before 10 p.m.