Ch. 7Lesson 2What are

tornadoes?

funnel cloud• rapidly spinning column of

air that comes down out of a thunderstorm

how tornadoes form

1. forms in thunderstorm

2. air in thunderstorm spins & tilts

3. narrow column of air inside becomes funnel shaped

4. funnel touches ground

How tornadoes form

tornadoes:• Most occur in spring & summer

• Winds from 200-500 kmh

• Center of low air pressure

vortex

• area where air or liquid spins in circles

waterspout

• rapidly spinning column of air over a lake or ocean

• weaker than tornado

Waterspouts 0:22

•column of whirling air•not a tornado

dust devil

dust devilsnot part of

thunderstormscan form when skies are clear

What are tornadoes?dust devil

severe storm

Doppler radar

• instrument used to look inside thunderstorm

• direction, speed of wind, vortex of tornado

Fujita scale• uses damage & wind speed to

classify tornadoes

tornado watch• tornadoes are likely to form within a few hours

?

tornado warning

• tornado has been detected

!Take cover in a safe location.

hurricane tornado

hurricane tornado

Has an eye

Winds At least 119 kmh

Bigger than tornado

Forms over warm, ocean water

Days of warning

Has no funnel

Could create floods

Do not tilt

Create storm surge

Forms on land

No eye

Can appear in midwest

Lasts a few minutes

Smaller

Has a vortex

Can be found inside hurricanes

Does not form over water

Has funnel shape

Strong, high winds

Deadly

Low air pressure

Can have different categories

Spinning

Dangerous storms

hurricane tornado

• destructive storms

• thunderstorm

•strong winds

• larger

• slower wind speed

• warm, ocean water

• days warning

•more rain

• smaller

• faster wind speed

• land

• minutes warning

•less rain