The Environment Entities can be found in Rollup Bar under Enity
CloudHeight: Specifies the height of the cloud above the tornado
FunnelEffect: Here a particle effect can be specified.
Radius: The influence radius of the tornado.
SpinImpulse: Specifies he spin speed that effects objects that are close to the tornado
UpImpulse: Specifies the pushing up speed that effects objects that are close to the tornado
WanderSpeed: The tornadoes moving speed can be specified here.
Shake: Specifies the amount of shaking Other Environment Entity Parameters
Click here for the Miscellaneous Parameters reference guide, here for the Material Layers guide, here for the Miscellaneous Entity Parameters guide, here for the Entity Links guide and here for the Entity Events guide.