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Tri-state tornado was the longest lasting deadliest twister in history, destroying about 15000 mid western homes and killing 695,695 people. 792 tornadoes spawned off.
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1951- The archipelago of Comoros of the eastern coast of Africa was struck by a deadly tornado in 1951. The twister started as a waterspout and gained strength and intensity as it struck land and killed an estimated 500 people. Other details concerning the incident are not known since the island nation was still under foreign rule. Hence, getting the exact location and statistical data wasn’t feasible.
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1953- Tornadoes in Flint, Michigan (June 8) and Worcester, Massachusetts (June 9) go back to back.
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1974- Three weather systems combine into a super-tornado outbreak in the U.S mid west. In 15 hours, 148 tornadoes broke out and killed 309 people and injured about 5300.