Have you heard anything about Tornadoes?

Hear what we know: A tornado is a violently rotating column of air. Most of the tornadoes last for less than ten minutes. On the other hand large tornadoes last about 30 minutes.

The common tornadoes have wind speeds of less than 177 kilometers per hour

An average death in US from tornado per year is about 50 people.

Tell us what else you know about tornadoes?