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Hurricanes 1231546204899344-1

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Hurricanes 1231546204899344-1

  1. 1. Hurricanes
  2. 2. The Producers  Researcher: Janvi  Writer/CEO: Aditi  Publisher: Beatrice  Technical Producer: Sarah
  3. 3. Tropical Cyclones  Hurricane: regional name for a tropical cyclone.  Tropical cyclone: low-pressure center and intense thunderstorms.  Tropical depressions: < 39 mph winds  Tropical storm: > 40 mph winds Typhoon Axel and Cyclones Mark and Betsy
  4. 4. Names of Tropical cyclones with winds greater than 74 mph
  5. 5. Parts of a Hurricane
  6. 6. The Eye • Calm center 20-40 miles diameter • Winds and rain stop • Sea may be violent • Lowest atmospheric pressures in the hurricane Eye (Hurricane Katrina)
  7. 7. The Eye Wall • Surrounds the eye • Greatest wind speeds and precipitation. • Eye wall replacement cycle: eye may change size, causing another eye wall to form. outer eye wall inner eye wall
  8. 8. Rainbands Rainbands • Ring of thunderstorms that rotate counterclockwise • Width: few miles to tens of miles • Length: 50-300 miles • Calm weather between bands • Tornadoes often form in rainbands on land. (Hurricane Ivan)
  9. 9. Quiz I! Match the following items to their characteristic quality: A. Eye 1. Most destructive B. Eye Wall 2. Lowest pressure C. Rainbands 3. Causes tornadoes
  10. 10. Formation
  11. 11. How to Make a Hurricane in 5 Easy Steps!
  12. 12. Hurricane Maintenance  Winds converge and push air upward.  Strong winds continue blowing and maintain the speed of the storm  Storm weakens when there’s a difference in wind speeds.
  13. 13. Movement
  14. 14. Movement  Controlled by winds moving westward.  Coriolis Effect: Earth’s rotation causes hurricanes to turn towards poles.  Landfall: eye crosses coastline, which experiences only half the storm. The Coriolis Effect
  15. 15. Tracks  Track: cyclone’s path of motion.  Track is deflected north by winds. Global cyclone tracks (1985-2005)
  16. 16. Dissipation How a Hurricane Loses Strength and Disintegrates ► Moving over land or low temperature waters. ► Remaining in one area for too long. ► Outer eye wall forms. Hurricane Katrina
  17. 17. Quiz II! What is the effect that causes hurricanes The Coriolis Effect to turn towards the Earth’s poles?
  18. 18. Categorizing “At last!! They’ve named a hurricane after you and your mother!”
  19. 19. The Saffir-Simpson Scale  Rates hurricane intensity on scale of 1-5.  Factors:    Damage Flooding Wind speed Pre-Katrina Post-Katrina
  20. 20. Category 1  Wind speed: 74-95 mph (Slightly higher than top speed of cheetah)  Storm surge: 4-5 feet  Little damage and flooding
  21. 21. Category 2  Wind speeds: 96-110 mph (Top speed of baseball pitch)  Storm surge: 6-8 feet  Slight damage on buildings and plants.  Chances of floods
  22. 22. Category 3  Wind speed: 111-130 mph (Speed of bullet train)  Storm surge: 9-12 feet  Damage on building structures  Flooding occurs; evacuation may be required.
  23. 23. Category 4  Wind speed: 131-155 mph (Wind speed of leaf blowers)  Storm surge: 13-18 feet  Major damage to buildings, trees, and coastal floors.
  24. 24. Category 5  Wind speed: > 155 mph (Diving speed of Peregrine falcon)  Storm surge: > 18 feet  Homes can be washed away.  Low-lying residences must be evacuated.
  25. 25. The Final Result?
  26. 26. Naming Hurricanes  Named by location from list of names.  Names alternate male and female.  After all names on list are utilized, Greek alphabet used.
  27. 27. Quiz III! What is the most important factor in Wind Speed determining a hurricane’s category?
  28. 28. Hurricanes and Us
  29. 29. Result of Hurricane Katrina Damage  Fatal mudslides and floods can occur.  Buildings can be washed away.  People may be killed or severely injured.
  30. 30. Cost  Dependent upon: – hurricane intensity – location – response Category 1 •little damage •$1000’s Category 2-3: •significant damage •$100,000’s Category 4-5: •extensive damage •$1,000,000,000’s
  31. 31. Safety …Because Fremont’s really going to get hit by a hurricane.  Be aware of emergency plans and procedures.  Identify potential hazards.  Shut off utilities (gas, electricity, water).  Discard contaminated food.  Don’t start fuel-burning devices.
  32. 32. Observation  Far from land: tracked by satellites  Near land: tracked by aircrafts or Doppler radar  Doppler updates on location and intensity.
  33. 33. Forecasting  Track predicted by hurricane pressures.  Computer software produces models and predicts rainfall.  Intensity of storm least accurately predicted.
  34. 34. Beneficial Effects  Moderates global heat balance  Stirs up waters of coastal fish breeding areas  Spurs redevelopment of housing
  35. 35. Global Warming Increase in global temperatures Increase in water temperatures Increase in hurricane intensity
  36. 36. Quiz IV! Satellite Name one of the tools used to track hurricanes. Doppler radar Airplanes
  37. 37. Extraterrestrial Hurricanes Why can’t true There’s no water! hurricanes form on Duh. other planets?
  38. 38. Jupiter
  39. 39. Saturn
  40. 40. Notable Hurricanes
  41. 41. Great Hurricane of 1780 • Deadliest hurricane ever recorded • Category 4 • Struck the Caribbean Islands
  42. 42. Hurricane Ivan (2004) • Category 5 • Moved from Atlantic Ocean to Caribbean Sea • Cost: $19 billion
  43. 43. Hurricane Katrina (2005) • Costliest and deadliest • Category 5 • Moved from Bahamas to southern U.S. • Cost: $81 billion
  44. 44. Hurricane Paul (1982) • Second deadliest East Pacific storm • Category 2 • Moved from Central America to Baja California • Caused flooding and mudslides
  45. 45. Quiz V! What are the two planets (besides Earth) Saturn and Jupiter that have cyclonic storms?
  46. 46. Credits Information CDC Emergency Preparedness & Response  About  The Pew Center  Wikipedia  Atlantic Oceanographic and Meteorological La 
  47. 47. Credits Images              Cyclone Tracy Meteorological Information University of South Florida The NASA SCIence Files Mission 2010 [MIT] Wikipedia The National Center for Atmospheric Research Vantage Point Guides Weather Wiz Kids State of New Hampshire Natural Hazards Mitigation Plan CartoonStock Irresponsible Journalism NOAA Satellite and Information Service Associated Press: Hurricane Season 2006
  48. 48. Credits Animations/Music    The National Climatic Data Center Merry-Go-Round of Life [Howl’s Moving Castle] ASesgui @ Youtube.com   Joe Hisaishi Excremental Intermission  Tim Halbert
  49. 49. -EndWe hope you enjoyed the show! :)

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