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HURRICANES

HURRICANES. The History, Structure, Development, and Destruction By S. LaTorre, J. Pannu, P. Nguyen, G. Frederick. Source: http://www.dc.peachnet.edu/~pgore/students/w97/matheson/hpage.htm. What is a hurricane?. Violent cyclonic storm that develops in the tropical region

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HURRICANES

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  1. HURRICANES The History, Structure, Development, and Destruction By S. LaTorre, J. Pannu, P. Nguyen, G. Frederick Source: http://www.dc.peachnet.edu/~pgore/students/w97/matheson/hpage.htm

  2. What is a hurricane? • Violent cyclonic storm that develops in the tropical region • Wind speeds are > 74 mph Source: http://earthobservatory.nasa.gov/ Newsroom/NewImages/images.php3?img_id=680

  3. Rotation and Pressure In which direction does a hurricane rotate? COUNTERCLOCKWISE Is the barometric pressure inside the hurricane high or low? LOW

  4. When is Hurricane Season? June 1st through November 31st

  5. What is the role of the National Weather Service during hurricane season? • Provides weather information, such as data from satellites • Responsible for issuing watches and warnings to the media and general public

  6. Watch vs. Warning • What is the difference between a Hurricane Watch and a Hurricane Warning? • Watch – Tropical storm poses a threat to coastal areas with 36 hours • Warning - Tropical storm conditions are expected in a coastal area within 24 hours

  7. What conditions must be present for a hurricane to develop? • Warm ocean temperatures (>80˚ F) up to 60m deep • Little to no wind shear • Low pressure system at least 5˚ North or South of Equator • Rotation caused by winds Source: http://lwf.ncdc.noaa. gov/oa/reports/fran/fran.html

  8. What is the major source of energy fueling a hurricane? Heat Energy evaporating from the ocean surface Source: http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/hyd/evap.rxml

  9. Hurricane Anatomy Source: http://hurricanes.noaa.gov/prepare/structure.htm

  10. Another look at the Structure Source: http://hurricanes.noaa.gov/prepare/structure.htm

  11. Important Terms • Tropical Disturbance Group of thunderstorms in the tropics that are present for at least 24 hours • Tropical Wave lack of circulation, winds <25 mph and every direction • Tropical Depression closed circulation but disorganized, winds at least 25 mph

  12. Important Terms Tropical Storm Shower and thunderstorm moves over closed circulation, winds greater than 39 mph Hurricane Eye is developed, winds > 74 mph

  13. Compare the Following Source: http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/hurr/stages/home.rxml

  14. By what two factors is hurricane strength measured? Wind Speed Barometric Pressure

  15. What is the Scale Used to Categorize Hurricanes? Saffir-Simpson Scale Source: http://kids.earth.nasa.gov/archive/hurricane/saffir-simpson.html

  16. What causes the damage in a hurricane? • Winds • Flooding • Storm Surge

  17. What is a storm surge? • Large wall or dome of water that rushes into the coastline as a result of a hurricane making landfall • To the right are the areas affected by high storm surges Souce: http://www.wkrg.com/hurricanecenter/surge/SE.jpg

  18. What destroys a hurricane? • Strong vertical winds • Cold water • Movement over land • Friction • Lack of moisture

  19. What are the five costliest hurricanes in the United States? • Hurricane Andrew – 1992 • Hurricane Hugo – 1989 • Hurricane Fran – 1996 • Hurricane Opal – 1995 • Hurricane Frederic - 1979

  20. Why the majority of the costliest storms are relatively recent • Damage is a result of development • There are more developed areas and possessions than in the past Source: http://www.nhc.noaa.gov/1992andrew.html

  21. How has a hurricane affected you personally? • Damage to your house from wind? • Damage from flooding? • Destroyed vacation house? • Damage to family members’ homes?

  22. Flooding of Tar River as result of Hurricanes Dennis and Floyd Dockside Tar River Estates Mrs. Parker’s Old House Final Water Level http://cindi.usgs.gov/cindi/hazard/event/floyd/ncflood/mediums/img023.jpg

  23. Extensive Flooding Extended Power outages Flood Related Deaths Property Damage Damage to Greenville US 264 Bridge Source: http://cindi.usgs.gov/cindi /hazard/event/floyd/ncflood/ mediums/img022.jpg

  24. Damage to Greenville Source: http://www.guc.com/about/floyd.htm

  25. Protection • Listen to warnings • Take all warnings seriously • Follow evacuations • Prepare Food and Water for extensive power outages

  26. THE END Source: http://www.dc.peachnet.edu/~pgore/students/w97/matheson/hpage.htm

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