Post on 11-May-2015
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