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Thus, experts now don't know whether the 1925 Tri-State tornado -- which killed about 695 people when it tore through Missouri, Illinois and Indiana -- was actually a single funnel or many, which is why it isn't officially considered the deadliest single tornado.
CNN: STORY HIGHLIGHTS
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Officials hadn't confirmed that a tornado actually touched down in Dallas but said the storm was capable of producing one.
CNN: Officials: 6 dead, dozens injured in Texas storm
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Like a surprising number of people in Oklahoma, Shelley didn't have an underground tornado shelter, so he jumped in his car and took off.
CNN: One block, two tornadoes: Life in the crosshairs