Chapter 6 lesson 3 what causes severe weather
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Chapter 6 Lesson 3 What causes severe weather ? PowerPoint PPT Presentation


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Chapter 6 Lesson 3 What causes severe weather ?. 1 st stage: currents of moist air move upward. Water condenses and forms clouds which have ice crystals and water droplets. 2 nd stage : precipitation falls and pulls some air downward and currents of air move up and down.

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Chapter 6 Lesson 3 What causes severe weather ?

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Chapter 6 lesson 3 what causes severe weather

Chapter 6 Lesson 3What causes severe weather?


Thunderstorms

1st stage: currents of moist air move upward.

Water condenses and forms clouds which have ice crystals and water droplets.

2nd stage: precipitation falls and pulls some air downward and currents of air move up and down.

Last stage: all the air currents move down. The precipitation leaves the clouds and they get smaller.

Thunderstorms have lightening.

Lightening is a a large electrical spark that moves between areas of opposite charge.

Lightening can heat up the air and makes vibrations (thunder).

Thunderstorms


Tornado

Tornado

  • http://video.nationalgeographic.com/video/player/environment/environment-natural-disasters/tornadoes/tornadoes-101.html


Tornadoes

Tornadoes

  • Thunderstorms can cause tornadoes.

  • A tornado is a rotating column of air and it reaches from the clouds to the ground.

  • 1st-Layers of wind blow at different speeds or in different directions.

  • A column of air starts spinning between the layers or wind.

  • Downward winds push down on the other end.

  • When it touches the ground it is called a tornado.


Hurricanes

Hurricanes

  • A hurricane is a strong cyclone that forms by warm ocean water.

  • Water vapor from the ocean condenses, it releases heat.

  • A hurricane can be hundreds of kilometers wide and can cause rain.

  • The center of the hurricane is called the eye, where it is cam and has few clouds.


Chapter 6 lesson 3 what causes severe weather

  • Large bodies of water, like oceans can affect the temperature of the air.

  • The air is tempered

  • It is warm in the winter and cooled in the summer.


Monsoons

Monsoons

  • A monsoon is a wind that changes direction in different seasons.

  • The winter monsoon starts when the land becomes colder than the nearby ocean. Winter monsoons are dry.

  • Summer monsoons are wet. Moist air from the ocean moves towards the land.


What to do when severe weather happens

What to do when severe weather happens!

  • http://www.baynews9.com/video?clip=http://static.baynews9.com/newsvideo/bn9/arc/Severe_Weather_0311.f4v

  • How is severe thunderstorm watch different from severe thunderstorm warning?

  • Give an example of a safe place to hide from a tornado.

  • What area of a hurricane is calm?


Lets create a hurricane

Lets create a hurricane

  • http://weather.about.com/gi/o.htm?zi=1/XJ&zTi=1&sdn=weather&cdn=education&tm=5&gps=416_308_1596_650&f=20&su=p284.9.336.ip_&tt=29&bt=1&bts=1&zu=http%3A//www.nhc.noaa.gov/HAW2/english/kids/movncane.htm


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