There were no immediate reports of major damage or injuries as a result of the storms.

There were no immediate reports of major damage or injuries as a result of the storms.

Nearly 22,000 We Energies customers were left without power after the storms rolled across the region.

Nearly 22,000 We Energies customers were left without power after the storms rolled across the region.

By late afternoon on Wednesday, that number had been reduced to 2,600 customers without power, the Milwaukee-based utility said.

A tornado outbreak in mid-October is unusual for southeast Wisconsin, said Tim Halbach, warning coordination meteorologist with the National Weather Service in Sullivan.

"It’s nothing that’s unheard of, but it’s just not as often that we see this kind of activity this time of year," Halbach said.

Peak tornado season in southern Wisconsin typically occurs in June, July and August.

Peak tornado season in southern Wisconsin typically occurs in June, July and August.

Halbach said the weather service was working on Wednesday afternoon to confirm how many tornadoes occurred.

Several of the storms on Wednesday produced what is known as tornado "debris signatures" on Doppler radar, Halbach said.