The crashes occurred because of wind shear--a sudden change in wind speed and direction. Wind shear is common in thunderstorms, due to a downward rush of air called a microburst or downburst.

Another way to measure wind speed is with Doppler radar. Radar recordings aren't considered for wind records by the WMO because they are remote estimates, versus direct measurements, Cerveny said.

Radar systems being developed to protect eagles from wind turbines. — -- On a warm February day, in the shadow of the Rockies, two eagles are preparing for flight. The birds, a bald eagle ...

An Iowa State Patrol trooper shared video that was shot while the severe storms blew through Monday."Sgt. Trainor stopped UNDER a bridge just as the worst of the storm came through Linn County ...