Check it all out. A tornado is a viscous storm that forms when hot and moist air comes in contact with cooler, dry air. In the formation, these storms form when warm, moist air blowing spiral from one area comes in contact with cool, dry air spiraling from another direction. When these two air masses meet, they begin to form funnel shapes as they rise into the air. This pulls the spiraling clouds from the ground and the destruction begins.
Tornadoes can be a few feet to several miles wide.
Winds in these storms can exceed 300 miles in the most powerful ones. The power of a tornado is measured by the Fujita Scale, which measures the storms according to damage potential and wind speed. The scale ranges from F0 for the weaker storms to F5 for the catastrophic ones. As they spin on the ground, they move and are unstoppable. Anything coming in contact with them are usually done for.