Tornadoes are a dangerous and violent rotating column of air.

What Causes Tornadoes?

Tornadoes usually form in violent thunderstorms and severe winds. Those are some just plain warning signs of a tornado. Some signs of tornadoes would be wind shear and instability. Wind shear is the changing in direction and increasing wind speed with height.

How Do Tornadoes Form?_


tornadomap.jpg A tornado forms when cool, dry air and warm, humid air mixes. Most of the time it forms during a thunderstorm. That is because thunderstorms and tornadoes form from the same cumulonimbus cloud. Thunderstorms develop in warm, moist air, just like tornadoes. That is because when there is a thunderstorm, you should always watch for tornadoes. Tornadoes in the winter and early spring are often associated with strong, frontal systems that move east.

What Are The Types of Tornadoes?_


F-0


f-0.jpgF0_tornado_damage_example.jpg


The first, and weakest tornado is the F- 0 tornado. An F- 0 tornado has winds of less than 73 miles per hour (mph). The damage of F-0 tornadoes are light. If you would go look at the outdoors after a tornado, you would see branches snapped off of trees, small branched trees knocked down, and signs knocked over.

F-1


f-1.jpgf1.jpg


The next level on the scale is an F-1 tornado. Most winds from this type of tornado range from 73- 112 mph. The damage from this type of tornado would result by having cars and other automobiles blown off the road, roots on the surface of the ground pulled up, and homes pulled of the foundations.

F-2

f-2.jpg2478446027_9a0b66e391.jpg

The third level of tornadoes is the F-2 tornado. Winds can go from 112- 157 mph. The damage from this tornado could rip roofs off of houses, demolish homes, overturn box cars, and lift large trees from the ground.

F-3

f-3.jpgF3TornadoDamage.jpg

The F-3 tornado is the fourth level in the tornado scale. Wind speeds range from 158- 206 mph. Tornado damage could result in trains overturned, rip larger trees off of the roots, and roofs and walls torn off of houses.

F-4

f-5.jpgN_ParisF4.gif

The F-4 tornado is the fifth level of the six types of tornadoes. The average wind speed for the F-4 tornado go from 207- 260 mph. Structures with weak foundations blown away from a distance, cars blown off, and missiles generated.

F-5

f-44.jpegGreensburg_kansas_tornado.jpg

The F-5 tornado is the final and the most powerful tornado in the tornado scale. Wind speeds could range from 261- 318 mph. Strong houses on strong foundations could be blown off to a long distance. Steel products could be damaged greatly. Very devastating damage could occur. The F-5 is the most dangerous and violent tornado.



Multiple Vortex

multi_vortex.jpg

A multiple vortex tornado is a type of tornado when two or more tornadoes are rotating in a common rotation. It is often seen in rough tornadoes. This tornado forms near the main tornado. A multiple vortex tornado makes smaller paths of heavier damage than the main tornado.



Waterspout

250px-Trombe.jpg

A waterspout tornado is a tornado that is over water. Waterspout tornadoes are similar to dust devils and land spout tornadoes. This type of tornado forms at the bottom of cumulus congestus clouds over tropical waters. They are most likely to form in the Florida Keys and northern Adriatic Sea. Tornadoes over water are far more intense and one of the most dangerous tornadoes.



Dust Devil

200px-Dust_devil.jpg

Dust Devil tornado is a vertical swirling column of air. The Dust Devil is mainly sand and dirt. Dust Devils form under clear skies. That is a reason why the dust devil isn't classified as a tornado. Also, dust devils do not have clouds. This is not much weaker than the weakest tornado.


Funnel Cloud

funnel_cloud2.jpg

A funnel cloud is basically a "baby" tornado. They cloud never touch the ground. A tornado forms from a funnel cloud. Funnel clouds form mostly in super cell thunderstorms. These can be very well noticed when it passes. Funnel clouds sound like buzzing bees, roar, a sucking, or a waterfall sound. Also, it is said that your ears can pop if under one. That is pressure drop.


Where Do Tornadoes Occur?_

Tornado_Alley.gif

Tornado_Global_800.jpg


Tornado Safety_

1. Stay away from windows.

2. Go to the lowest floor.

3. Hide in small, windowless room.

4. Lie in ditch, and cover your head.

5. Go to storm shelter.




RESOURCES_

http://www.weatherquestions.com/What_causes_tornadoes.htm

http://www.tornadoproject.com/fscale/fscale.htm

http://en.wikipedia.org/wiki/Tornadoes__

http://www.nssl.noaa.gov/edu/safety/tornadoguide.html

http://en.wikipedia.org/wiki/Funnel_cloud