Duh-what-choo? Find out more about the possible derecho threatening millions of Americans.
That's what happened last year, when a powerful storm system blasted from Indiana to Maryland. Considered the largest of its kind, it killed more than a dozen people, leaving millions in the dark and shutting down Netflix as well as other online services that relied on Amazon's Cloud servers.
Keystone Resort/Ben Lindbloom
Jessica Rinaldi / Reuters
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