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5th Grade-Ch. 8 Lesson 3 What Causes Severe Weather

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5th Grade-Ch. 8 Lesson 3 What Causes Severe Weather

  1. 1. Lesson 3 What causes severe weather?
  2. 3. How thunderstorms form 3. Precipitation (rain) falls 2. Air condenses- forms clouds <ul><li>Moist air rises quickly </li></ul>
  3. 4. thunderstorms diff. areas- diff. charges (+ or -) lightning = large, electrical spark moving between areas of opposite charges- heats air
  4. 6. How Thunderstorms Are Formed [01:43]
  5. 7. Make lightning <ul><li>Make Lightning! </li></ul><ul><li>The purpose of this experiment is to observe lightning formation. </li></ul><ul><li>Materials: S tyrofoam plate, T humbtack, P encil with new eraser, A luminum pie pan, S mall piece of wool fabric </li></ul><ul><li>1 . Push the thumbtack through the center of the aluminum pie pan from the bottom. </li></ul><ul><li>2 . Push the eraser end of the pencil into the thumbtack. (The pencil becomes a handle to lift the pan.) </li></ul><ul><li>3 . Put the Styrofoam plate upside-down on a table. Rub the underside of the plate with the wool for one minute. Rub hard and fast. </li></ul><ul><li>4 . Pick up the pie pan using the pencil &quot;handle, &quot; and place it on top of the upside-down plate. </li></ul><ul><li>5 . Touch the pie pan with your finger. If you don't feel anything when you touch the pan, try rubbing the plate again. </li></ul><ul><li>Try turning the lights out before touching the pan. Do you see anything when you touch the pan? </li></ul><ul><li>What happened when you touched the metal pie pan? What caused that? </li></ul><ul><li>How do you think this experiment relates to the formation of lightning? </li></ul><ul><li>It's all about static electricity! Lightning happens when the negative charges (electrons) in the bottom of the cloud (and your finger) are attracted to the positive charges (protons) in the ground (and the pie pan). The resulting spark is like a mini-bolt of lightning. </li></ul><ul><li>The accumulation of electric charges has to be great enough to overcome the insulating properties of air. When this happens, a stream of negative charges pours down towards a high point where positive charges have clustered due to the pull of the thunderhead. </li></ul><ul><li>The connection is made and the protons rush up to meet the electrons. It is at that point that we see lightning. A bolt of lightning heats the air along its path causing it to expand rapidly. Thunder is the sound caused by rapidly expanding air. </li></ul>Make lightning Make lightning
  6. 8. <ul><li>severe storm warning </li></ul><ul><li>severe storms have formed </li></ul><ul><li>get prepared (get inside) </li></ul><ul><li>!!! </li></ul><ul><li>severe storm watch </li></ul><ul><li>severe storms might form </li></ul><ul><li>?? </li></ul>
  7. 10. how tornadoes form 3. Upward winds lift 1 end up- downward winds push other end down 2. Column of air between starts to spin (funnel cloud) 1. Layers of wind blow at different speeds &/or directions
  8. 11. How Tornadoes Develop [01:39
  9. 13. Tornadoes versus Hurricanes [00:34]
  10. 15. how hurricanes form Lose energy over land Water vapor condenses  forms clouds  releases energy  fuel winds Get energy from warm, ocean water
  11. 16. How Hurricanes Develop [01:52]
  12. 17. hurricane tornado
  13. 18. <ul><li>meters wide </li></ul><ul><li>severe weather storms </li></ul><ul><li>highly destructive </li></ul><ul><li>last for minutes </li></ul><ul><li>last for days </li></ul>hurricane <ul><li>100’s km wide </li></ul>tornado <ul><li>faster winds </li></ul>
  14. 19. The safest place to be during a tornado is in a basement.
  15. 20. No basement? Find shelter in a windowless room.
  16. 21. Name that severe weather
  17. 22. <ul><li>Gets energy from warm, ocean water </li></ul>Thunderstorm Tornado or Hurricane Hurricane
  18. 23. <ul><li>Caused as a result of different areas having different charges </li></ul>Thunderstorm Tornado or Hurricane Thunderstorm
  19. 24. <ul><li>When a funnel cloud touches the ground </li></ul>Thunderstorm Tornado or Hurricane Tornado

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