Hurricanes

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8th grade Honors Science, Dr. Ricks.

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  • Hurricanes

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

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