Mobile homes must be evacuated in a tornado for sturdier shelter. Mobile homes can be overturned or destroyed even by relatively weak tornadoes.
Air is continuously moving up in a tornado. This means that air surrounding the tornado must move in to replace the rising air.
Thunderstorms need to start rotating. This rotation must then tighten and intensify to produce a tornado.
Rotation.
What goes up, must come down. The tornado simply carries stuff downwind and deposits them.
To be classified as a tornado, a funnel cloud must make contact with the ground. Once the funnel cloud touches the ground, it becomes a tornado and is classified based on its size, intensity, and associated damage.
To be classified as a tornado, a funnel cloud must reach the ground. Funnel clouds that do not reach the ground are typically referred to as non-tornadic funnel clouds.
It depends what you call a tornado. Most tornado-like clouds do not touch the earth's surface. Some say that until it touches the ground it is not a tornado but a funnel cloud; however the definition of a tornado does not state that it must touch the ground. It all depends on what you're taught.
You cannot accurately identify a tornado based on the sound. That said, if you can hear a tornado it is probably already very close. You must take cover immediately. Heat to you basement or an interior room on the lowest floor of your house.
There is no drain plug. Transmission pan must be removed.
Tornadoes destroy property and money must be used to restore property.
The danger isn't categorical. That's like asking which is more expensive, a home repair or a medical expense. Each tornado or hurricane must be gauged individually.