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Hurricanes.

Published byAsher Nicholson Modified over 6 years ago

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Presentation on theme: "Hurricanes."— Presentation transcript:

1 Hurricanes

2 Hurricanes help distribute global energy…
Move heat from tropics to higher latitudes Like El Niῆo in Pacific

3 Where can they form? 5 to 20 degrees latitude Most in North Pacific!
Hurricanes that affect U.S. begin in Atlantic, Caribbean, or Gulf Move east to west in trade winds

4 Needed for formation… Warm, deep ocean water
Converging winds at surface Unstable warm air rises Low pressure at center

5 FYI…Lowest pressure systems…
Wilma (2005) 882 mbar Gilbert (1988) 888 mbar Unnamed (1935) 892 mbar Rita (2005) 895 mbar Allen (1980) 899 mbar Katrina (2005) 902 mbar “Normal” atmospheric pressure is 1000 mbars at sea level

6 Needed for formation… Humid air at high altitudes
Vapor condenses releasing energy Pre-existing winds same direction, altitude, speed Upper atmosphere high-pressure pumps air up and away

7 Hurricane Circulation

8 In the northern hemisphere…
Rising air moves counterclockwise surrounding the storm Eye wall – greatest wind speed and heaviest rainfall Bermuda High steers storms

9 Storm Surge

10 Video

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