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See the related question for what causes tornadoes in general. The event started when a low pressure system started pulling warm, moist air off the Gulf of Mexico several days before the Parkersburg tornado. As the system shifted northward it brought that air to Iowa. Then the system drew in a dry air mass from the north.this forced the moist air mass upwards, triggering the development of severe thunderstorms. Very strong wind shear set these storms rotating. One of these was exceptionally powerful, producing the EF5 tornado that struck Parkersburg.

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