What is the opposite of tornado?

Last night we had a microburst in Lafayette, which, as it turns out, is sort of the opposite of a tornado. In a microburst, a shaft of cold air presses down, making the wind blow (in this case at about 70 miles an hour) in all directions from the center. It was weird to see the wind change direction fairly suddenly from blowing east to blowing south. Lots of trees down and people without power. Here’s a diagram for your edification.

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