Piper City Fire Department issued the following announcement on May 21.

Tornado watch in effect until midnight - be weather aware - have a plan of action

The national weather service has issued tornado watch 236 in

effect until midnight cdt tonight for the following areas

In Illinois this watch includes 6 counties

In Central Illinois

Livingston

In North Central Illinois

La Salle Lee Ogle

Winnebago

In Northeast |Illinois

Grundy

This includes the cities of Byron, Coal City, Dixon, Dwight,

Fairbury, La Salle, Marseilles, Mendota, Minooka, Morris,

Mount Morris, Oregon, Ottawa, Peru, Polo, Pontiac, Rochelle,

Rockford, and Streator.

Original source can be found here.