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Severe Weather!!!!!!! Chapter 20.3

Learn about severe weather phenomena like thunderstorms, lightning, tornadoes, and hurricanes in Mr. Fetch’s Earth Science Classroom. Discover how they form, the dangers they pose, and essential safety tips. Explore fascinating facts and the science behind each weather event. Gain insights into storm chasing and understand the intensity of hurricanes with the Saffir-Simpson Scale. Prepare yourself with crucial information on staying safe during severe weather events.

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Severe Weather!!!!!!! Chapter 20.3

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  1. Severe Weather!!!!!!!Chapter 20.3

  2. What is severe weather? Weather that poses a danger.

  3. What is a thunderstorm? A storm that produces: 1. Lightning2. Thunder3. Heavy Rain and/or flooding4.Strong winds and possibly hail They last about 15-60 minutes. Mr. Fetch’s Earth Science Classroom

  4. How do thunderstorms form? When warm, moist air is lifted up violently.The air rises up to form a cumulonimbuscloud. Mr. Fetch’s Earth Science Classroom

  5. If the winds are over 58 mph, the thunderstorm is said to be a SEVERETHUNDERSTORM

  6. How does lightning form? Updrafts and downdraftsof wind and rain cause different parts of a cloud to become electrically charged. + + - • (+) charge at top of cloud • (-) charge at bottom of cloud - Mr. Fetch's Earth Science Class

  7. How Far Away is Lightning? • Every secondbetween a lightning flash and thunder means the storm is1 mileaway. • Speed of Light: 186,000 miles/second or 300,000 km/second • Speed-of-sound: 1100 ft/sec (330 m/sec)

  8. Struck By Lightning!!! • The odds of becoming a lightning victim in the U.S. in any one year is 1 in 100,000. • The odds of being struck in your lifetime is 1 in 3,000. • https://www.youtube.com/watch?v=L1HhRAUqFqM • https://www.youtube.com/watch?v=ltK5c60nBHQ

  9. The Safest Place? • Talking on the telephoneis the leading cause of lightning injuriesinside the home • Standing under a tall treeis one of the most dangerous places to take shelter outside https://www.youtube.com/watch?v=bKczulzP5wk

  10. Lightning Facts NO SUCH THING AS HEAT LIGHTNING = FAR AWAY THUNDERSTORM

  11. Thunder • Caused by the rapid expansion and contractionof the air surrounding a lightning bolt.

  12. How does a tornado form? Tornado: A rotating column of air. 1. Wind shearcauses air to rotate.2. The rotating column of air is lifted by updrafts3. The column of air touches the ground = tornado

  13. Tornadoes are usually associated with severe thunderstorms.

  14. How are tornados classified?

  15. 3 out of every 4 tornadoes in the world happen in the United States Interesting Tornado facts The United States have an average of 800 tornadoes every year A Tornado can occur at any time, but most often between 3pm and 9pm The chances that a tornado is a F5, the highest classification for a tornado on the F-scale, is less than 0.1% A Tornado in Oklahoma once destroyed a whole motel. People later found the motel’s sign in Arkansas

  16. Storm Chasing - your future career? http://www.youtube.com/watch?v=bhGWWY1nCWw&feature=relmfu

  17. Hurricanes

  18. Hurricane Animation http://www.cbsnews.com/htdocs/natural_disasters/hurricanes/framesource_flash.html

  19. 5 Things a Hurricane needs to Form

  20. Progression to a Hurricane

  21. Saffir-Simpson Scaleis used to measure a hurricane’s intensity

  22. Most dangerous part of hurricanes Storm Surge– like what happened with Hurricane Katrina L

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