A tornado touched down during the late afternoon of Monday, Feb. 24, in open country southeast of Watertown, S.D. This is the ...

A mesocyclone doesn't always produce a tornado ... The team then had to balance those tornado samples with difficult non-tornado samples. If the dataset were too easy, say by comparing tornadoes ...

FARGO — A tornado touched down ... brief and relatively non-violent because they are not associated with the powerful updraft of the mesocyclone of a well-developed, severe thunderstorm.