Tornadoes and Hurricanes
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Transcript Tornadoes and Hurricanes
CGF3M
Tues. Dec. 10, 2013
Also called a twister or cyclone
A tornado is a powerful rotating column of air
extending from a thunderstorm to the ground, with
updwards spiralling winds
Occur most frequently in late spring/ early summer,
between 3-9 pm.
Found in Canada, Russia, China, Bangladesh,
Argentina, Australia- but are most frequent in the US
More than 700 occur per year in the US
Warm, moist air
from Gulf of Mexico
moves north and
collides with polar
air moving south
from the Arctic
Creates instability
in the atmosphere,
leading to
supercells
FLASH animation
Storm chasers spend up to 12 hours / day in a vehicle
tracking down storms to study
Some use specially-designed vehicles that can actually
enter a tornado to collect data and video
Inside a tornado-
incredible video!
Dangers of storm
chasing- 3 dead after
tracking- video
The Fujita Scale ranks tornadoes according to wind
speed, duration, and path of destruction
The path can be erratic and may suddenly change
direction
Damage can extend anywhere from 15-450 kms in
length, and can be 2 metres- 2 km wide
Approx. 80 tornadoes occur each year in Canada, 2
deaths
Before and after pictures- Joplin, MI
Tornado watch- conditions are ripe for the
development of a tornado… stay tuned.
Tornado warning- a funnel cloud has been spotted in
the area. Take shelter!
Also known as typhoons, tropical cyclones, and willy-
willies
Originate over the warm ocean in areas close to the
Equator
Intro- video
Read the article about recent Typhoon Haiyan, answer
questions
Tomorrow: Guest speaker!