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I think the answer is that doppler radar has improve significantly, a vertical rotating column of high wind speeds is indicative of a tornado approaching or likely to touch down..

The most likely occurring activity is ; An approaching Tornado

The Vertical rotating of wind at very high speed indicates that a Tornado is approaching or have already started touching down within the environment.

A doppler radar is used to detect the movement and position of objects such a wind and rain drops from a distance making use of the doppler effect. they are used in weather forecasting

Hence we can conclude that The most likely occurring activity is An approaching Tornado.

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