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HURRICANES Source:

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Presentation on theme: "HURRICANES Source:"— Presentation transcript:

1 HURRICANES Source:

2 What is a hurricane? Violent cyclonic storm that develops in the tropical region Wind speeds are > 74 mph Source: 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 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: gov/oa/reports/fran/fran.html

5 What is the major source of energy fueling a hurricane? Heat Energy evaporating from the ocean surface Source:

6 Hurricane Anatomy Source:

7 Another look at the Structure Source:

8 What is the Scale Used to Categorize Hurricanes? Saffir-Simpson Scale CategoryMax Wind Speed (mph) Min. Surface Pressure (mb) Storm Surge m (ft) > (3-5) (6-8) (9-12) (13-18) 5> 155< 920> 5.7 (>19) Source:

9 What causes the damage in a hurricane? Winds Flooding Storm Surge

10 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:

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

12 What are the five deadliest hurricanes in the United States? 1. Galveston – Southeast Florida – Florida Keys – New England – Florida Keys – 1935

13 Explain why the deadliest storms were longer ago. Lack of instrumentation to predict and track storms People were not warned of the incoming danger No ability to take pictures from satellites (important!) Source: Results of the Galveston Hurricane

14 Source: THE END


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