Tornado

In Minnesota, we've often had these, some quite destructive.

What is interesting about this video is the fact that at first, the funnel at the ground is almost invisible, because has just started to pick up debris (the road's gravel and some soil).

I wonder why or what conditions could have spawned the cyclonic action without pulling down the clouds type water vapor we often see in these.




Courtsey of jimreedphoto.com