Wisconsin tornado causes extensive damage and cuts power to thousands

Tornado that blackened midday sky rips roofs off homes and flips vehicles in town of Menasha

A tornado struck north-eastern Wisconsin on Monday, blackening the midday sky and sending workers sheltering in office basements as ferocious winds splintered homes, scattered twisted metal across a highway and knocked out power to more than 30,000 people.

The National Weather Service confirmed a tornado in Winnebago county, about 90 miles (145km) north-west of Milwaukee. Damage was reported in cities including Appleton and Menasha, where police chief Matt Albrecht said some homes and businesses were severely impacted".