[Updated at 12:05 p.m.] The National Weather Service has issued a tornado watch for lower Michigan, Lake Erie, Lake Huron and the Lake Michigan area.
The tornado watch area is approximately along and 100 statute miles east and west of a line from 25 miles west southwest of Jackson, Michigan to 30 miles east northeast of Houghton Lake, Michigan, the NWS reported.
[Updated at 11:49 a.m.] A brief tornado touchdown was reported in Louisville, Kentucky. As with all reports so far, this is unconfirmed until the Weather Service can survey the damage.
[Updated at 11:45 a.m.] Tens of thousands of people were without power in Illinois and Wisconsin, and homes and buildings were damaged by high winds and, possibly, tornadoes.
Officials in Iroquois County, Illinois, told CNN affiliate WLS-TV in Chicago that he had also heard unconfirmed reports of more tornadoes near the towns of Chebanse and Donovan. No reports of injuries were immediately available, but WLS reported that there were reports of an entrapment in a home in Peotone.
Some experts told WLS that the storms may be the most powerful to hit Illinois in more than 70 years.
Crews are working to restore power to about 59,000 custormers in northern Illinois, WLS quoted a spokesman for ComEd as saying. Of those, nearly 28,000 are in Chicago's western suburbs. In southeastern Wisconsin, about 6,000 We
Energies customers were without power Tuesday morning, a spokesman for that utility told JSOnline.
[Updated at 11:35 a.m.] The National Weather Service Storm Prediction Center has issued an updated forecast of widespread "damaging winds" and a few possible tornadoes in Ohio, the Tennessee Valleys and the Great Lakes Tuesday as the storm system barrels through the Midwest.
[Updated at 11:17 a.m.] Wind tore the roof off a house south of Chicago, in Will County, Illinois, injuring two children slightly, a sheriff’s spokesman told CNN affiliate WGN.
[Updated at 11:08 a.m.] A tornado reportedly caused severe damage to buildings near Racine, Wisconsin.
The National Weather Service and a Racine County Sheriff's Department official told CNN affiliate WTMJ-TV in Milwaukee that a tornado touched down in Sturtevant, just west of Racine, causing severe damage to homes and businesses.
One of those businesses, the Case Corp., had a 100- to 200-foot section of its roof torn off, WTMJ reported. There were no immediate reports of injuries, but workers were sent home for the day.
[Updated at 11:03 a.m.] A tornado was reportedly spotted in Kokomo, Indiana in Howard County and another one was reportedly spotted on the ground near Hopkinsville, Kentucky in Christian County.
Both are unconfirmed reports of tornadoes.
St. Louis officials were also investigating a partial building collapse that occured Tuesday morning that sent bricks and debris flying because of strong winds, CNN affiliate KSDK reported.
[Updated at 11:01 a.m.] A massive storm system roared into the Midwest Tuesday morning, with winds exceeding 70 mph and isolated strong rainstorms capable of "embedding" tornadoes, forecasters said. Damage from falling trees and high winds has been reported in Missouri.
There were unconfirmed reports of tornadoes touching down in Illinois, Wisconsin and Kentucky. The National Weather Service said it has sent a team to Racine, Wisconsin, to check on a possible touchdown there.
What was thought to be a tornado ripped the roof off a building and partially collapsed a home in Peotone, Illinois, authorities there said. Local emergency management officials reported a damage of approximately a half-mile.
[Updated at 8:42 a.m.] The National Weather Service issued severe weather warnings Tuesday morning in much of the upper Midwest, as well as a tornado warning in northern Wabash County, in southeastern Illinois, until 7:45 a.m. (8:45 a.m. ET).
At 7:20 a.m., a severe storm capable of producing a tornado was detected 4 miles southwest of Lancaster, Illinois.
Wind gusts exceeding 60 mph were reported in parts of Missouri, including St. Louis, where two reported partial building collapses were blamed on the extreme weather, according to Officer Donna Wisdom of the St. Louis Police Department.
There are no reports of injuries at this time, Wisdom said.
Severe weather warnings are in place until 7:30 a.m. (8:30 a.m. ET) in southeast Missouri and southern Illinois, with a strengthening front capable of producing severe winds, and possibly tornadoes, moving north toward metro Chicago and much of Indiana.