Chicago weather remains unsettled heading into the weekend, with a severe storm threat Friday evening that brings the possibility of tornadoes and flooding.

The storm traveling east has already resulted in an evacuation order from the Harley-Davidson festival on Milwaukee's lakefront.

After a long night yesterday of severe weather, we are keeping a watch on some more potentially severe storms for this evening. Most of our area is under a Tornado Watch until 8PM tonight with an

An updated tornado warning was issued by the National Weather Service on Tuesday at 5:52 p.m. in effect until 6:30 p.m. for Bucks, Montgomery and Philadelphia counties.

Spectators of the INDYCAR race at Iowa Speedway were forced to take shelter during a tornado warning on Friday. A message over the speedway's speakers advises people take shelter.

After an afternoon filled with tornado sirens, lightning strikes, torrential rain and visible cloud rotation near Iowa Speedway, IndyCar canceled Friday afternoon practice.