 Yes, that's the definition of severe turbulence, which is stronger than gravity. So if you're not seat belted and you fly through severe turbulence, you will lift up out of your seat. And we've published a number of studies now analysing the amount of severe clear air turbulence in the atmosphere, going back to 1979, which is when satellites first began observing it. Now, satellites can't see the clear air turbulence because it's invisible, but they can tell us about the shape and the three-dimensional structure