In the article, they mention:
The collision of a pair of weather systems right over northeast Illinois has led the National Weather Service to issue an "extraordinarily rare" tornado watch for the area today.
"We're very concerned," weather service meteorologist Gino Izzi said earlier. "We're definitely stressing that this is not your run-of-the-mill tornado watch."
It is in effect until 4 p.m. for all of the Chicago metropolitan area, Izzi said. The area at risk includes the entire city of Chicago and notably Soldier Field, where the Bears are scheduled to play the Baltimore Ravens at noon, right about the time the storms should be at their worst. It also extends to all of Illinois, southern Wisconsin and northwest Indiana until 4 p.m.
This is the "top tier" of tornado watches that ever gets issued, he said, adding it is "extraordinarily rare."
Stay inside, watch Da Bears or something, just be careful out there. I know almost all of you only through here but I'd hate to see any of you become statistics in this.