One tornado chaser with a camera poses while his partner gets into their truck as a tornado approaches in South Dakota.  South Dakota had 35 tornadoes in 2009, and is part of "Tornado Alley," an area of the Midwest United States that sees more tornadoes than the rest of the country.
Storm-stained skies hover over the remains of a mobile home demolished by a passing tornado. A photographer caught this extreme close-up of a tornado funnel in Manchester, South Dakota.  The combination of high winds, flying debris, and loud noise of the tornado would have made this photographer very uncomfortable. Heavy clouds hang low over a dilapidated homestead in the Midwest, foretelling a possible tornado. An EF5 tornado threw a van into a hotel in Greensburg, Kansas.  An EF5 tornado produces winds greater than 200 miles per hour (322 kilometers per hour), and can pick up and throw vehicles and destroy buildings with ease.
A waterspout touches down near a boat near Dubrovnik, Croatia, in August 2007.  Waterspouts are weak tornadoes that happen over warm water.
A thin funnel cloud touches down in a field in northwest Iowa.  Funnel clouds become tornadoes once they touch the ground. A woman searches the wreckage of her mother's house in Arkansas after a February 2008 tornado removed the roof.


A Kansas vehicle license plate impaled on a tree after an EF5 tornado struck Greensburg, Kansas. A woman looks through a broken window of a friend's house after a February 2008 tornado over Atkins, Arkansas. The National Geographic Society aims to be an international leader for global conservation and environmental sustainability.
Tornado chasers there spent seven hours and 150 miles (240 kilometers) tracking the supercell thunderstorm that produced this cloud formation. The F (Fujita) scale was used to measure wind speeds based on damage left behind after a tornado, and an F3 tornado had wind speeds between 158 and 206 miles an hour (254 to 332 kilometers an hour). Forecasters in the United States can give an average warning time of 13 minutes before a tornado hits.
Despite a myth that says otherwise, opening windows to equalize the pressure between the inside and outside of a house during a tornado will not prevent them from breaking. When individuals pledge to use less water in their own lives, our partners carry out restoration work in the Colorado River Basin.


Supercell thunderstorms are known to spawn tornadoes with winds exceeding 200 miles an hour (322 kilometers an hour). The United States now uses the EF (Enhanced Fujita) scale, which takes more variables into account when assigning wind speeds to a tornado.
The best place to be in a tornado is in a basement or interior room of the lowest floor of a sturdy building.
An EF3 tornado now has wind speeds between 136-165 miles per hour (218-266 kilometers per hour), and the tornado pictured could be an EF3, EF4 or EF5.



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Rubric: Business Emergency Preparedness



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