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Chapter 6 Lesson 3 What causes severe weather ?

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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  1. Chapter 6 Lesson 3What causes severe weather?

  2. 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

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

  4. 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.

  5. 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.

  6. 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.

  7. 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.

  8. 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?

  9. 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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