The partial failure of Minnesota’s Rapidan Dam sheds like on the almost 4,100 dams in the U.S. that are categorized at the same risk level and condition – or worse.
In the last week, extreme weather has wreaked havoc in many parts of the U.S. and around the world. The events have brought climate change's threat into focus.
As a deadly tornado cut a path across Iowa last month, storm chasers tracked it, gathering rare data that is now offering detailed, close-range insight into powerful twisters.
The Greenfield tornado on May 21 was strong enough to overturn and crush a car. The Adair County Medical Clinic, in the background, was spared a direct hit.
The May 21 twister downed wind turbines southwest of Greenfield. Tim Marshall, a veteran storm chaser, said it takes winds of 120 mph to 140 mph to tear such structures down.
"This is the type of damage that probably got rated EF4," Joshua Wurman, a University of Illinois tornado researcher, said of the May 21 twister in Greenfield.
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