No, not a real one, thank goodness, but a cool demonstration of tornadic activity and weather in a play area for children called the Kid’s Spot. It’s in Terminal 3, Boarding Area F, in a mostly United Airlines part of the Terminal.
One little girl who played in the tornado told me that there is a very similar device, on a larger scale, in the city at San Francisco’s Exploratorium. “It’s my favorite place, ever!” she said.