Hurricanes.

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Presentation transcript:

Hurricanes

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

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

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

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

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

Hurricane Circulation

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

Storm Surge

Video http://video.nationalgeographic.com/video/101-videos/hurricanes-101

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