Diamond Enthusiast

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Yes. See here for some basic info about tornadoes, and especially this part of the site where they discuss what causes tornadoes and note that humidity is one of the 3 main factors.
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Diamond Enthusiast

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As the article says, humid air at low altitude is one of the main factors. Dewpoint is a measure of humidity. Therefore, a high dewpoint (which indicates a high humidity) helps cause tornadoes.
I don't know how high it would have to be.
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