What is the cause of tornadoes and thunderstorms.

He intense spinning of a tornado is partly the result of the updrafts and downdrafts in the thunderstorm (caused by the unstable air) interacting with the wind shear, resulting in a tilting of the wind shear to form an upright tornado vortex.

Its when there r up drafts and down drafts in the thuinderstorm and that turns into the tornado yesterdays weather tho omg