> Are storms often strong enough to knock a plane out of the sky?

Simply put: yes. Not just any thunderstorm. All thunderstorms.

All aircraft avoid thunderstorms. It's not a case of discomfort for humans inside it; it's about the risk to aircraft themselves.

Thunderstorms contain severe updrafts and downdrafts and huge windshear between them. Aircraft cannot outclimb the downdrafts so cannot maintain altitude inside them. And severe windshear will tear them apart.

The only reason you don't hear about aircraft lost in thunderstorms is because pilots avoid them. All of them.

A friend of mine who is a glider pilot once compared thunderstorm to a steamroller.

If you get hit by the leading edge your plane will get smashed into the ground. If you somehow get to the back part, your plane might end up in the stratosphere, which might be just as fatal due to very low temperature and lack of oxygen.

He mentioned some early gliding pioneers who were insane and lucky enough managed to "ride" a thunderstorm and achieve record breaking flight distance - and somehow not getting killed in the process.

So how do hurricane hunters survive? Are hurricanes less, for lack of a better word, volatile?

> Are storms often strong enough to knock a plane out of the sky?

And then some. The forces in a run of the mill thunderstorm could rip the wings off a plane in seconds.

The addition of people to the plane makes zero difference to storm survivability, why would it?

Storms are definitely regularly large enough to bring down even large aircraft, it doesn't happen often because planes of systems on board to ensure they avoid such weather, but it can happen!

https://en.wikipedia.org/wiki/Southern_Airways_Flight_242

Flying by instruments, I wonder how high the risk truly is. One of the bigger concerns might be an instrument failure, like the failure of the airspeed sensors on Air France 447.

Very very high. What fuels a thunderstorm is large amounts of air rising, and falling very rapidly. When the aircraft encounters those air movements it can very quickly exceed the structural limits of the aircraft.

Some more detail: flying in rising or sinking air isn't a problem in itself, as long as you can tolerate the change in altitude. But flying from one into the other, fast, is a sure way to exceed structural load levels.

There were many failures in the cockpit of AF447. Almost all of them were aft of the instruments.

Problem exists between keyboard^H^H^H^H^H^H^H^H yoke and chair