You are in a window seat, with your tray table down and a glass of water. Pick a level to see, as an illustration, what you would notice. It is a toned-down representation to show you what is normal, not a measurement.
At cruising altitude, severe turbulence covers only a few tenths of a percent of the sky at any given time, according to Professor Paul Williams (University of Reading). Pilots get updated forecasts and warnings and use them to fly around areas where it is expected, although it cannot always be predicted.
Source: NPR, "How dangerous is turbulence on airplanes?" (2023).IsItBumpy does not replace your crew or official weather services.