Tornado

A tornado is a tube of violently spinning air that touches the ground. Wind inside the tornado spins fast, but the actual 'circle' of wind around them is massive. This makes tornadoes very dangerous. Tornadoes are especially dangerous to people in cars or mobile homes.

Tornadoes mostly happen during strong thunderstorms called supercell storms. They cause a lot of damage to anything in the path. Tornadoes are ranked on the Fujita scale, from F0 to F5. The F0 has the lowest wind speed, and the F5 has the highest one.

Tornadoes can happen in nearly any part of the world. In the United States, a tornado has been created in all states. The middle part of the United States is nicknamed 'Tornado Alley' for the large amount of tornadoes created there.

A tornado does not necessarily need to be visible; however, the extremely low pressure caused by the high wind speeds and rapid rotation usually causes water vapor in the air to condense into a visible condensation funnel. The tornado is the vortex of wind, not the condensation cloud.

To keep safe in a tornado, here are some tips you can follow:

• Go to the lowest floor of the building. Stay close to the center of the building and away from windows.
• Find a piece of strong furniture or a mattress to go under or hide in a closet and wait until it is over.
• If you are in a school, do not go to the gymnasium or any other place that has a high ceiling. Squat near the wall, placing your hands on the back of your head.
• If you cannot find shelter, find the lowest, most protected ground and cover your head with your hands.

Source: simple.wikipedia.org