While most of the damage was likely caused by harsh, straight-line winds, they will be checking to see if tornadoes may have touched down.

A final assessment by the weather service is expected to be completed and transmitted via a Public Information Statement this week.

A tornado warning has been issued for parts of Ohio, West Virginia, and western Pennsylvania. The National Weather Service says the warning includes parts of Eastern Belmont County in Ohio, parts of Marshall and Ohio counties in West Virginia, and parts of Greene and Washington counties in Pennsylvania.

At Chicago O'Hare International Airport, more than 150 flights were canceled and 129 delayed. The Federal Aviation Administration said Thursday that ground stops could be issued at Dallas-Fort Worth International and Denver International Airport.

A tornado warning was issued for northwest Putnam County Wednesday night and it’s believed it was a tornado that did quite a bit of damage in the area. The Dupont area got hit the hardest with several buildings and homes damaged or destroyed.

Many in Middle Tennessee woke up to several volleys of tornado warnings, lightning, thunder and a lot of rain as round after round of severe weather blew through the region Thursday morning.

At 3:47 a.m. on Thursday, the National Weather Service issued a tornado warning in effect until 4:15 a.m. for Greene and Washington counties.

The National Weather Service issued a tornado warning for southcentral Wisconsin on Wednesday. The warning includes Stoughton, Edgerton and Evansville and is active until 6:30 p.m. The weather service said a tornado was "radar indicated" and pea-sized hail is possible.