CalmwingIs this turbulence normal?
Almost certainly yes. Turbulence is air moving, and the plane moves with it like a boat on waves. It feels dramatic and is a comfort problem, not a safety problem.
| Level | What it feels like | Typical size |
|---|---|---|
| Smooth | Nothing, or a faint hum | under 0.04 g |
| Light | Like a car on a rough road; drinks may ripple | 0.04 to 0.15 g |
| Moderate | Walking is hard; things shift; it feels bigger than it is | 0.15 to 0.4 g |
| Strong | Unsettling and loud; the seat belt sign is on | above 0.4 g |
How much can the plane take?
Airliners are certified for 2.5 times the force of gravity in flight and must not break below 3.75 times. Even strong turbulence is a fraction of that. Wings are bent far past anything real flight causes before a plane is allowed to carry anyone.
The one rule
Keep your seat belt fastened while seated. Almost every turbulence injury happens to someone who was not wearing one.
Why the sizes above are approximate
Calmwing's bump meter measures the strongest bump in a few seconds with your phone's motion sensor, so the numbers depend on where the phone rests. They are a guide for reassurance, not an aviation instrument.
Do pilots know about it?
Yes. They see storms on radar, receive pilot reports and forecasts, and ask for a different altitude or route when they can. A bumpy stretch rarely lasts long.