A tornado is a rotating column of air that extends from a thunderstorm to the ground. Tornadoes form when warm, moist air rises rapidly and encounters cooler air aloft, causing the warm air to rotate. The most tornado-prone area of the United States is known as Tornado Alley, which includes parts of Texas, Oklahoma, Kansas, Nebraska, South Dakota and North Carolina. Tornadoes in this region occur most frequently in the late spring and early summer months. Tornadoes are classified based on wind speeds and damage caused using the Fujita Scale, ranging from F0 with winds of 40-72 mph to F5 with winds over 260 mph.

1. Entry Task:Entry Task:
In your own wordsIn your own words
describe what a tornado is.describe what a tornado is.

2. The World is always changing.
Natural disasters are changes which are so great
they may cause damage to the shape of the land or
to the lives of people and other living things.
Great changes happen deep inside the Earth and
on its surface. The changes on the outer part of the
Earth happen because of different kinds of weather.

3. What are Natural Disasters?What are Natural Disasters?
 EarthquakeEarthquake
 Volcanic eruptionVolcanic eruption
 TsunamiTsunami
 HurricaneHurricane
 AvalancheAvalanche
 FloodFlood
 DroughtDrought
 TornadosTornados

4. InteractiveInteractive
Notebooks:Notebooks:
 Title = A, D, F and TornadosTitle = A, D, F and Tornados
 Right Side = Class NotesRight Side = Class Notes

5. AvalancheAvalanche
An Avalanche is a movement of snow, ice and
rock down a mountainside. Avalanches happen
very suddenly and can move as fast as a racing
car up to 124mph.
Avalanches can be caused by –
snow melting quickly
snow freezing, melting then freezing again
someone skiing
a loud noise or an earth tremor

6. FloodFlood
A flood is caused by an overflow of water which
covers the land that is usually dry.
Floods are caused by heavy rain or by snow
melting and the rivers burst their banks and
overflow.
Costal floods are caused by high tides, a rise in
sea level, storm waves or tsunami (earthquakes
under the sea).

7. DroughtDrought
A drought is the lack of rain for a long time.
In 1968 a drought began in Africa. Children born
during this year were five years old before rain
fell again.

9. https://cf.nearpod.com/neareducation/n

10. What states you think have theWhat states you think have the
most tornados per year:most tornados per year:

11. What is TornadoWhat is Tornado
Alley?Alley?

13. Frequency of Tornados in Tornado AlleyFrequency of Tornados in Tornado Alley

14. https://cf.nearpod.com/neareducation/n

24. T o r n a d o e s a r e c la s s ifie d a c c o r d in g to th e d a m a g e th e y c a u s e , u s in g th e F u jita S c a le .
F u jit a P e a r s o n T o r n a d o S c a le
F - 0 4 0 - 7 2 m p h C h im n e y d a m a g e , tr e e b r a n c h e s b r o k e n .
F - 1 7 3 - 1 1 2 m p h M o b ile h o m e s p u s h e d o ff fo u n d a tio n o r o v e r tu r n e d .
F - 2 1 1 3 - 1 5 7 m p h C o n s id e r a b le d a m a g e , m o b ile h o m e s d e m o lis h e d , tr e e s u p r o o te d .
F - 3 1 5 8 - 2 0 5 m p h R o o f s a n d w a lls to r n d o w n , tr a in s o v e r tu r n e d , c a r s th r o w n a b o u t.
F - 4 2 0 7 - 2 6 0 m p h W e ll- c o n s t r u c te d h o u s e s le v e lle d .
F - 5 2 6 1 - 3 1 8 m p h H o m e s lifte d o ff fo u n d a tio n s a n d c a r r ie d c o n s id e r a b le d is ta n c e s ; a u to m o b ile s
th r o w n a s fa r a s 1 0 0 m e tr e s

42.  Tornado Watch:Tornado Watch:
Tornadoes are possible in and near the watchTornadoes are possible in and near the watch
area. Review and discuss your emergencyarea. Review and discuss your emergency
plans, and check supplies and your safe room.plans, and check supplies and your safe room.
Be ready to act quickly if a warning is issued orBe ready to act quickly if a warning is issued or
you suspect a tornado is approaching. Actingyou suspect a tornado is approaching. Acting
early helps to save lives!early helps to save lives!
 Tornado Warning:Tornado Warning:
A tornado has been sighted or indicated byA tornado has been sighted or indicated by
weather radar. Tornado warnings indicateweather radar. Tornado warnings indicate
imminent danger to life and property. Goimminent danger to life and property. Go
immediately under ground to a basement, stormimmediately under ground to a basement, storm
cellar or an interior room (closet, hallway orcellar or an interior room (closet, hallway or
bathroom).

43. LEFT SIDE:LEFT SIDE:
 Complete these questions onComplete these questions on
youryour left sideleft side of yourof your
Interactive Notebook.Interactive Notebook.
 Write theWrite the questionquestion & the& the
answeranswer..