Whats the name of a severe thunderstorm that can produce large hail, damaging winds, and violent tornadoes?
I think it's called a super cell, but I'm not sure about this one.
a really bad storm
A derecho. (Der-A-show)
A Supercell is the only kind of storm that is known to spawn a tornado but within what is called a mesocyclone. However, not all Supercell storms have the prerequisites of forming a violent tornado.