Severe thunderstorm watch in effect

A severe thunderstorm watch for the northern Illinois, including the greater Chicagoland area until 2 a.m. Tuesday.

A severe thunderstorm watch means conditions are favorable for severe thunderstorms in and close to the watch area. persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. severe thunderstorms can and occasionally do produce tornadoes.