A relatively weak tornado produced a record-breaking and more-than-mile-wide swath of damage in Iowa. Here's how that stacks ...

Damage surveys provide crucial information about when, where and how strong U.S. tornadoes are to better understand disaster risk ...

At least one tornado touched down in Iowa along with baseball-sized hail in severe storms that also hit Nebraska and worked ...

A tornado ripped through the town in Page County, and KETV crews observed power poles on the ground, shed doors blown in and ...

A powerful, wide-reaching spring storm is threatening parts of the central and eastern US, with a life-threatening outbreak ...

Severe storms and possible tornadoes are forecast to continue across a wide swath of the South, the Storm Prediction Center ...

Tornadoes and hurricanes remind us how vulnerable we can be in the face of nature. Each storm is different, but the outcome is often the same: physical damage, financial loss, and the long road to ...

The wind speeds are just estimates, based on damage surveys conducted ... a disproportionate number of tornado-related fatalities. Data indicates that EF4 and EF5 tornadoes account for ...

Damage looks flattened out ... The last time was May 31, 1985, when an EF5 tornado that tore through parts of Portage and Trumbull counties claimed 10 lives. There were 10 other tornadoes in ...

to the rare EF5 (incredible damage), based on the most severe damage observed along a tornado's path, not by any other real-time metric such as Doppler radar or their appearance on video.