He said the most destructive tornado appears to have remained on the ground for five to 10 miles (eight to 16 kilometers) near Elk City, which is about 110 miles (180 kilometers) west of Oklahoma City. Fire Chaplain Danny Ringer told reporters late Tuesday that the storm destroyed 40 homes and severely damaged up to 75 others.
At least two dozen of the 50 or so trailers were damaged at the Prairie Lakes Estates trailer park in Chetek, Wisconsin, where a 46-year-old man was killed.
An outbreak of severe storms with "some strong, long-lived tornadoes", is expected Thursday afternoon and evening in parts of northwest Oklahoma and south-central Kansas, forecasters said.
State emergency officials are juggling multiple responsibilities, severe weather damage in Barron County and more severe storms moving into Southern Wisconsin Wednesday night.
The Storm Prediction Center says strong wind gusts and large, damaging hail are possible throughout the region.
Barron County Sheriff Chris Fitzgerald said, "I know there were walls on top of people".
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"A few trailers on the perimeter are still standing, but everything in the middle is completely gone", Chetek police officer Cody Stauner told the Leader-Telegram. "At this time, we're just searching the area with the search terms and making sure there's no one injured, then we'll assess the damage", said Sheriff Fitzgerald.
Fitzgerald said local and state officials are calling it a tornado, but that hasn't been confirmed by the National Weather Service.
Authorities have released the name of a man who was killed when a tornado tore through a mobile home park in northwestern Wisconsin.
Images shot from a helicopter for CNN affiliate KFOR showed homes with their roofs ripped off. Photos from the scene showed flattened homes and debris and furniture strewn across streets. The path and strength of the tornado are still being analyzed. "I think it's simply because people are inundated with those news stories when the mobile home parks are hit because the damage is much more significant".
Some people said they followed his advice and were caught in major traffic jams on highways in central Oklahoma as a tornadic storm approached Oklahoma City. He said that in some cases, the responders left their own storm-damaged homes to help search the mobile home park.
Amazingly, Nolan escaped with just a couple of scratches, he said. He estimated the park had almost 50 homes. We have several homes that were completely destroyed. Fitzgerald also says there are at least 25 injuries reported.
The Wisconsin tornado was part of a huge swath of the Plains and Upper Midwest threatened with severe weather.