Pages in this set

Page 1

Preview of page 1
How a tornado is formed

Tornadoes are among the most violent storms on Earth,
with the potential to cause very serious damage.

Although no two tornadoes are the same, they need certain
conditions to form - particularly intense or unseasonable heat.

A storm quickly develops - there may be rain,…

Page 2

Preview of page 2
How a tornado is formed

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.


Page 3

Preview of page 3
How a tornado is formed

Upward movement of air can become very rapid. Winds from
different directions cause it to rotate.

A visible cone or funnel drops out of the cloud towards
the ground.


Page 4

Preview of page 4
How a tornado is formed

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.


Page 5

Preview of page 5
How a tornado is formed

Winds within the tornado may be so fast they cannot be
properly measured. Instead, the Fujita damage scale is used
to estimate speed.

F0 (0-73mph) - Light damage: Some damage to chimneys.
Branches broken from trees and some trees blown over.

F1 (73-112mph) - Moderate…


No comments have yet been made

Similar Geography resources:

See all Geography resources »