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Storms, tornadoes threaten much of US

Orlin Wagner / AP

A thunderstorm moves over a farm near White Cloud, Kan., May 28.

By John Newland and Daniel Arkin, NBC News

A wide swath of the heartland – stretching from Texas to the Great Plains and up into the lower Great Lakes – was being threatened by monstrous thunderstorms Tuesday evening, kicking off what is expected to be a week of severe weather.

Tornado warnings were sent out in at least four states, with one massive twister already on the ground in Kansas – nearly one week after neighboring Oklahoma was devastated by a deadly twister.

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