TORNADO'S
How do they work?

Alex Hernandez - Earth Science - Period 4






What is a tornado?

Is a strong and violent rotating column of air extending from a thunderstorm to the ground. The strongest tornadoes are capable of huge destruction and winds that can get up 300 mph. they are known for torturing large trees, uproot trees and hurl vehicles hundreds of yards. According to "weatherwizkids.com" in a avarage year, 1000 tornadoes are reported nationwide.

What causes a tornado?


they usually form from thunderstorms. The warm and moist air from the gulf of mexico and the cool, dry air from Canada. When the two meet they create instability in the atmosphere. A change in wind direction and a increase in wind speed with increasing height creates an invisible, horizontal spinning effect in the lower atmosphere.


Why do some tornadoes destroy some houses and leave others all together?

They can be a couple of reasons, one being that the zone of very destructive winds in a tornado can be very small, so that while the winds in a small portion of some tornadoes can deal a great deal of damage, the area just beyond it might only cause moderate damage. Furthermore, tornadoes can pack winds up to 100 mph faster than the rest of the tornado, which can mean the difference between a house being completely destroyed or just losing part of its roof. also How well-built a house is can also be a factor.

What are the numbers such as F2 or F5 used to describe tornadoes?

These numbers are the rating for how fast the tornado is rotating/moving.


How long do tornadoes last?

Well according to "USAtoday.com" a tornado can have duration from a couple of seconds to more then an hour. In addition, they also might stay on the ground for a few yards or more then 100 miles. on average, tornadoes usually travel about 30 miles from southwest to the northeast.


Where do tornadoes occur most frequently?

According to Jack Williams from USAtoday.com, there are no exact boundaries, but there is an idea of where tornadoes hit the most. one being the region on the Great Plains extending from central Texas north to the Canadian border.

What time of the year are tornadoes most likely to occur?

According to Jack Williams from USAtoday.com, they can happen just about any time of the year. May is the time in the year where most tornadoes occur but April is the month where many deadly twisters had occurred during the passed few years.


Can tornadoes go over hills or even mountains?

According to Jack Williams from USAtoday.com, Almost nothing or maybe nothing can stop a twister, one example to prove it is the F4 twister that hit Jackson, Wyoming which went over mountains as high as 10,000 ft.

Which way does the tornado rotate?

According to Jack Williams from USAtoday.com, this can be a trick question because you can only tell from where you are. According to the latest tornado research, 99 percent of all tornadoes in the Northern Hemisphere rotate counterclockwise. But specialists and scientists have recorded clockwise spinning tornadoes north of the equator.


Why don't tornadoes hit big cities?

According to Jack Williams from USAtoday.com, Twisters do hit in such areas but since cities are usually built up areas with architecture, they wont hit as much because they are not very opened areas and another reason is big cities weather isn't as favorable as it is in the Southeast, on the Plains and in the Midwest.

Where I Got The Information:

http://usatoday30.usatoday.com/weather/askjack/wfaqtorn.htm

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