Relationship of "Wall Clouds" to Tornadoes

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Below, I have a posting that talks about "wall clouds" and their association to tornadoes. Here is an excellent video from North Dakota yesterday (in the same general area where a tornado warning is in effect now) that shows the speed/scale of rotation in a wall cloud in relation to a tornado. Viewing this video will be helpful when assessing whether rotation threatens you in the absence of a tornado warning. Video by Roger Hill via YouTube.

Hat tip: Tim Marshall and Will Wilkens

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