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HURRICANES. The History, Structure, Development, and Destruction. Source: http://www.dc.peachnet.edu/~pgore/students/w97/matheson/hpage.htm. Tomas approaches Haiti, landfall expected in Cuba - CNN.com. What is a hurricane?. Violent cyclonic storm that develops in the tropical region
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HURRICANES The History, Structure, Development, and Destruction 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 • Wind speeds are > 74 mph Source: http://earthobservatory.nasa.gov/ Newsroom/NewImages/images.php3?img_id=680
Rotation and Pressure In which direction does a hurricane rotate? COUNTERCLOCKWISE Is the barometric pressure inside the hurricane high or low? LOW
When is Hurricane Season? June 1st through November 31st
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 • The US Hurricane Bureau is in Miami. Canada’s is in Dartmouth (:
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
What conditions must be present for a hurricane to develop? • Warm ocean temperatures (>26˚C) 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
Even George Clooney loves them! • The Perfect Storm • The Perfect Storm - The Final Fight – YouTube • The Giant Wave - The Perfect Storm (3/5) Movie CLIP (2000) HD - YouTube
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
Hurricane Anatomy Source: http://hurricanes.noaa.gov/prepare/structure.htm
Another look at the Structure Source: http://hurricanes.noaa.gov/prepare/structure.htm
Comparison of 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
Comparison of Terms Tropical Storm Shower and thunderstorm moves over closed circulation, winds greater than 39 mph Hurricane Eye is developed, winds > 74 mph
Compare the Following Source: http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/hurr/stages/home.rxml
By what two factors is hurricane strength measured? Wind Speed Barometric Pressure
What is the Scale Used to Categorize Hurricanes? Saffir-Simpson Scale Source: http://kids.earth.nasa.gov/archive/hurricane/saffir-simpson.html
What causes the damage in a hurricane? • Winds • Flooding • Storm Surge
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
What destroys a hurricane? • Strong vertical winds • Cold water • Movement over land • Friction • Lack of moisture
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
Explain 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
What are the five deadliest hurricanes in the United States? • Galveston – 1900 • Southeast Florida – 1928 • Florida Keys – 1919 • New England – 1938 • Florida Keys – 1935
Explain why the deadliest storms were longer ago. • Lack of instrumentation to predict and track storms • People were not warned of the incoming danger Results of the Galveston Hurricane Source: http://www.1900storm.com/photographs/photo10.html
What were the names of the 2010 Hurricanes? AlexBonnieColinDanielleEarlFionaGastonHermineIgorJuliaKarl LisaMatthewNicoleOttoPaulaRichardSharyTomasVirginieWalter
How has a hurricane affected you personally? • Damage to your house from wind? • Damage from flooding? • Destroyed vacation house? • Damage to family members’ homes?
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
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
Damage to Greenville Source: http://www.guc.com/about/floyd.htm
Protection • Listen to warnings • Take all warnings seriously • Follow evacuations • Prepare Food and Water for extensive power outages
THE END Source: http://www.dc.peachnet.edu/~pgore/students/w97/matheson/hpage.htm