To save lives, supercomputers dive into the hearts of nature’s worst tornadoes

Video by PBS NewsHour

Leigh Orf chases tornadoes across America’s central plains, but not from inside a pickup truck. His preferred vehicle is a computer.

Orf, a University of Wisconsin-Madison meteorologist, creates computer simulations of supercell thunderstorms — and the twisters they spawn — from the safety of his lab. Even when they don’t yield twisters, supercells are some of the most powerful and deadly forms of severe weather, and like many in his field, Orf wants to...


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