The National Weather Service has issued a tornado watch until 7 p.m. tonight for several western Illinois counties, including Henry, Knox and Mercer.

The National Weather Service has issued a tornado watch until 7 p.m. tonight for several western Illinois counties, including Henry, Knox and Mercer.

Other Illinois counties included in the watch are Fulton, Cass, Mason, Menard, Sangamon, Morgan and Schuyler.