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Tornadoes: Formation, Facts, and Impacts

Learn about tornadoes, how they are formed, and their devastating effects. Discover interesting facts and explore real-life experiences of those affected by tornadoes.

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Tornadoes: Formation, Facts, and Impacts

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  1. Warm Up Answer the following questions on your warm up sheet: Have you ever experienced a tornado? How do you think a tornado is formed. http://www.youtube.com/watch?v=06YyI7crOy0

  2. TORNADOES

  3. Growth Mindset Quote of the Weeek “Hide not your talents. They for use were made. What’s a sundial in the shade?” -Benjamin Franklin

  4. Scientist of the Week: Benjamin Franklin On November 2, 1743 Ben Franklin discovered that storms move! Major of the week: Astronomy

  5. Homework For The Week • Study for your test and work on your study guide: DUE NOVEMBER 19 • Text Complexity Assignment: Hurricane or Tornado (DUE TUESDAY) • Hurricane Case Study (DUE THURSDAY) • Triple Play Assignment (DUE MONDAY 11/16) • Tutoring times shifted for the week (Thursday morning and Friday Afternoon—let me know if you are coming!)

  6. Today you only have to copy down the notes in red!

  7. Tornadoes • Tornadoes are caused by warm, moist air in advance of eastward-moving cold fronts The intense spinning of a tornado is partly the result of the updrafts and downdrafts in the thunderstorm • http://www.mnn.com/earth-matters/translating-uncle-sam/stories/what-causes-tornadoes

  8. Tornado Facts • Winds can exceed 300 mph!!! • Around 1,000 occur on average each year in the U.S. • Kill 80, injure 1,500 people each year on average • Can have a path up to a mile wide!!! • Can occur any time of the year, but peak during the spring (March-June)

  9. What do you think is happening in the picture?

  10. Tornados most frequently in the central U.S. in a region nicknamed “Tornado Alley”

  11. What Exactly Is A Tornado? • Violently rotating column of air (Vortex) extending from a thunderstorm to the ground

  12. How Do They Form? • Actually, no one knows for sure! • But…We have a pretty good idea…

  13. Step 1 Before a thunderstorm, a change in wind direction and an increase in speed forms an invisible, horizontal spinning effect at the base of the storm.

  14. Step 2 Rising air within the t-storm (updrafts) tilts the rotating air from horizontal to vertical

  15. Step 3 Vertical rotation now extends 2-6 miles up into the t-storm. Now a tornado may form and extend from this area of rotation to the ground.

  16. How Strong Are Tornados? • Strength is measured by the Fujita Scale... • F0 = weakest, F5 = Strongest

  17. Are Most Tornados Strong? • All tornados are potentially deadly, but most are actually relatively weak (74%)…! • Only 1% of all tornados fall in the F4 – F5 range

  18. What’s Up With Xenia, OH? • Xenia has been the target of several major tornados down through the years… • Most recent: Sept. 2000 • Most Notable: April 3, 1974

  19. Sept. 2000 Damage Where do you think this Tornado ranked on the Fujita Scale?

  20. Sept. 2000 Damage Where do you think this Tornado ranked on the Fujita Scale?

  21. Sept. 2000 Damage Where do you think this Tornado ranked on the Fujita Scale?

  22. Sept. 2000 Damage Where do you think this Tornado ranked on the Fujita Scale?

  23. April 3, 1974 Tornado

  24. April 3, 1974 Damage Where do you think this tornado ranked on the Fujita Scale?

  25. Answers • Sept. 2000 = F3-F4 (Severe/Devastating Damage; Winds of 200-260 mph) • April 1974 = F5 (Incredible Damage; Winds of 260-300+ mph!!!)

  26. Quick Review • Are most tornados strong or weak? • Which would cause more damage, an F1 or an F5 tornado? • During which season do most tornados occur in the U.S.? • What is the nickname of the region in the U.S. where many tornados occur? • What is used to classify the intensity of tornados? • Bonus**: How do experts think tornados form?

  27. Tuscaloosa Personal Account • I will pass out class copies of a First Hand Account of the Tuscaloosa Tornado from 2011. • We will read these as a class and discuss.

  28. Tuscaloosa Tornado • https://www.youtube.com/watch?v=a_MuaWDg5Z0 • http://www.youtube.com/watch?v=sA7TKSHJ_wM • https://www.youtube.com/watch?v=HdmTpsyQinM • https://www.youtube.com/watch?v=Grhqbmk-79U • http://www.youtube.com/watch?v=TIx26tN6pCk&feature=related

  29. THE END

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