A tornado watch means there are favorable conditions for a tornado, so people should keep a close eye on the developing ...

Before Chicago, Marissa was a general assignment ... Heather Marx, of nearby DeMotte, Indiana, likewise said she heard air-raid sirens for a tornado warning, and barely had time to get to safety.

But if the screaming sirens and looming threats to life ... skies darkened and thunder boomed as severe weather moved into the Chicago region. A tornado watch was issued for 10 counties in ...