What could contribute to a mass extinctions event

1/ Climate change

2/ Asteroid impacts

3/ Massive volcanic eruptions

4/ Sun explodes

etc. (all the things above are most likely to happen but alien invasion or things like that is also a theory that you can add depends mostly if you like it or not)

the supermassive black hole is in the middle of the galaxy.

supercell thunderstorms are perhaps the most violent of all thunderstorm types, and are capable of producing damaging winds, large hail, and weak-to-violent tornadoes