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There is no real set lower limit for the wind speed of a tornado. The Fujita scale starts wind speed estimates for an EF0 tornado at 65 mph, but some tornadoes have had estimated winds as low as 55 mph. On the original Fujita scale, F0 wind estimates start at 40 mph. Actual wind measurements from tornadoes are rare, so winds are usually estimated from damage. Many tornadoes, expecially some short-lived, weak ones, stay in open fields and never cause damage, making it impossible to estimate wind speed.

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11y ago

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