This video of a tornado touching down in Laramie, Wyoming last week is awe-inspiring. I had thought that tornados start in the clouds and then touch down on the ground but in this video at the 18-second mark you see that there is also a bottom-up element, a sliver that starts on the ground and joins to the larger part coming from the top. The tightness of the funnel cloud is indicative of the massive destructive power that it can unleash for anyone and anything that has the misfortune to lie in its narrow path.

