4th grade ch 7 lesson 2 what are tornadoes
Post on 18-Dec-2014
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Lesson 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
vortex
• area where air or liquid spins in circles
waterspout
• rapidly spinning column of air over a lake or ocean
•column of whirling air•not a tornado
dust devil
dust devils
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
!
hurricane tornado
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
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