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Watch National Geographic Witness Tornado Swarm online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

April 2011 was the most violent month of tornados on record, and the deadliest in modern times. The 'super outbreak' of April 26-27 alone involved more than a hundred separate twisters, killing over 300 people and cutting a swath of destruction across the south. Using dozens of amateur and professional sources, Witness tells the story of this once-in-a-century event, as captured by those who lived through it.