How are Twisters formed? 10pts!?

Question

I have to find out how Twisters are formed (In the film Day After Tomorrow). If you know how they are formed or have some good websites, please tell me. Also can you help me with hale stones? Thankyou!

Answer 1

Its a process that is not understood at this time but a low pressure develops high in the sky that has to be filled so air rushes upward. The lost air is then replaced causing a vortex or tornado. You can see the effect in photos of turbines being reved up in the open.

Answer 2

when hot and cold air mix, they make a circular pattern and pull rom gravity into circular patterns.. i believ thats how it is... its been a year...

Answer 3

A tornado begins in a severe thunderstorm called a supercell. Scientists aren't exactly sure why, but air coming into the storm begins to swirl and forms a funnel. The air inside the funnel spins so fast it pulls in more air--and objects! The funnel is kind of like a big vacuum cleaner.

The air pressure is very low inside the funnel, just like pressure is low inside the eye of a hurricane. Only in a tornado, the pressure is a lot lower--lower than any other place on earth.

Tornadoes can form when the atmosphere is unstable. One other thing that's needed is a front, a place where warm moist air meets cold dry air. This happens a lot in the Great Plains of the United States which is why it's called Tornado Alley.

Hail

A hailstone begins as a frozen raindrop or ice crystal. Strong updrafts of warm air and downdrafts of cool air move the frozen particle up and down through different levels of the storm cloud. The hailstone encounters different forms of moisture as it moves, and layers of frozen ice particles accumulate on its surface. The resulting hailstone has a layered structure.

Important to the buildup of hailstones is the existence in thunderhead clouds of supercooled water: water that remains in liquid form well below normal freezing temperature. Supercooled water droplets colliding with a foreign object--a piece of dirt, an embryonic hailstone--will freeze to it and thereby increase its size.

Much of the water in the upper part of a tall thunderhead cloud is supercooled. Once a hailstone starts to form in this part of the cloud, it can rapidly grow as it moves either upward or downward through the supercooled water.

Violent updrafts and downdrafts in thunderheads can carry hailstones, water droplets, (and airplanes) upward and downward at speeds to 180 mph (300 km/h). A single trip through a tall thunderhead can cause a hailstone to grow about one-half inch, so several trips are necessary to build up a large hailstone.

In the north, large hailstones are rare because the lack of strong ground surface heating does not favor the buildup of the gigantic thunderstorms common in some temperate climates. It would be interesting to know how the largest hailstone found by an Alaskan or Yukoner would compare with those found by residents of Potter, Nebraska in 1928. Hailstones there were about the size of large grapefruit with an average diameter of 5 1/2 inches. The biggest weighed a pound and a half.

Answer 4

when hot air and cold air blow toward each other

not touching but close together and starts spinning