Murfreesboro: An Unwarnable Tornado

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This is a tornado this afternoon that struck Middle Tennessee State University.

Published on Twitter a little while ago:

So, I looked at the thunderstorm in question on both of the radars in the area. The Nashville TDWR data just before the tornado, when a warning would have been issued, is below. 
There is no indication of a tornado on either radar. There is such a thing as an unwarnable tornado and this was one of them. The NWS was not at fault. 

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