Hurricanes A REVIEW CGF3M Tues. Dec. 17, 2013.

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Presentation transcript:

Hurricanes A REVIEW CGF3M Tues. Dec. 17, 2013

How do Hurricanes Form? Warm moist air from the ocean rises and condenses into clouds Winds near the equator move in a circular pattern, causing the cloud to rotate- this is called a tropical depression Warm air rises and begins to rotate faster, wind speeds increase When wind speeds exceed 65 km/ hr, the system is upgraded to a tropical storm When wind speeds reach 120 km/hr, the storm is officially classified as a hurricane

Hurricanes last as long as they have the “energy” (warm, moist air from the ocean) to feed them

Damages from Hurricanes Violent Winds- can topple buildings, rip roofs off structures, tear up trees by the roots, and fling debris through the air. Storm Surges- occur when strong winds drive a wall of water onto land. Can cause death by drowning, and extensive flooding. Flooding- heavy rains are associated with hurricanes. Flooding often disrupts transportation and communication networks which are vital for rescue

Hurricane Katrina Yesterday, you read a case study about Hurricane Katrina Video: Katrina, day by day Why was Katrina so devastating? Much of New Orleans is built below sea level on soft sediment Not enough wetlands near the city to reduce storm surges Levees and floodwalls not strong enough to withstand storm surges

Hurricane Katrina The confirmed death toll from Katrina was 1 800 Economic impact: $108 billion 80% of the city flooded, making most of the major roadways impassable 10-15000 residents sought shelter in the Superdome (football stadium), even though the power was out and the roof was peeling off- VIDEO Looting and violence across the city of New Orleans Katrina destroyed 30 offshore oil platforms Redistributed over 1 million people

Never Again Because of the immense damage and death toll, the name “Katrina” was officially retired by the US Meteorological Organization, and will never be used again. Tomorrow- catch-up period- last one before Xmas holidays! Thursday- Staff vs Student Volleyball Game Block A 11:05-11:40- bring $2 or a canned good for entry!