It’s simulated air moving up and down, which moves your plane in various ways depending on the individual surfaces being pushed up or pushed down. It’s not just a “shaking effect” that Asobo has slapped on. These are thermals that are used by gliders to stay in the air and soar for miles… Based on my experience flying in a light aircraft (always as a passenger, not a pilot), I would say the worst thermal turbulence I’ve experienced in MSFS would be considered mild-moderate in RL at best. The first time I went flying with my friend, which was on a calm summer day, I experienced more turbulence than I ever have in MSFS, and it almost made me not want to go flying again.
