Year 7 Natural Hazards

Tornadoes

Lesson Objectives: 1. To find out where

tornadoes strike2. Where are the areas most

affected?3. How a tornado is formed?4. How are Tornadoes

measured?

What has happened in this picture?

Take a look at this video clip..

• Using your Q6 handsets send in three words to describe a tornado……..

Click on photo for link to YouTube

Twister Fate

Tornados can happen at any place at any time given the right conditions. BUT, there is one country that experiences more tornadoes than any other…..

Which Country?

A) ChinaB) USAC) Australia

Answer: USA

If you were a storm chaser…….• Which three states would you definitely visit

during tornado season? Use an online map of your choice to help you.

Which 3 of the following 4 states?

A) TexasB) New YorkC) KansasD) Nebraska

Texas,Kansas and Nebraska are of the states in Tornado Alley. All of these states are more likely to experience tornadoes rather than the state of

New York.

Why and How?

No 2 tornadoes are the same

BUT

They all require certain conditions to form

Which of the following are the correct conditions particularly

required?

A) Intense or unseasonable heatB) Intense cold and high wind

As the ground temperature increases, moist air heats and starts

to rise

When the warm, moist air meets cold dry air, it explodes upwards, puncturing

the layer above. A thunder cloud may begin to build.

A storm quickly develops - there may be rain, thunder and lightning.

Upward movement of air can become very rapid. Winds from different

directions cause it to rotate.

The vortex of winds varies in size and shape, and can be hundreds of metres wide. A

tornado can last from several seconds to more than an hour and may travel dozens of miles.

Other forms of Tornado…

TyphoonFire Devil

Winds within the tornado may be so fast they cannot be properly measured.

Instead, the Fujita damage scale is usedto estimate speed.

How to measure a tornado

A Quick Quiz

Press and hold On/Off button to switch on

What is the name of the scale used to measure tornadoes?

Please enter the response into your remotes

Which scale of tornado has the most average frequency?

A) F0B) F1C) F2

Answer...

F1 (which has 40%)

(F0 has 29% and F2 has 24% frequency average)

True or False

A fire tornado is called a Fire Cyclone??

Answer...

FalseIt is known as a Fire Devil

What is a tornado in the sea know as?

A) TsunamiB) EarthquakeC) Typhoon

Answer...

C: Typhoon