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Weather Showcase
Tornadoes are formed when a tropical air mass meets a polar air mass. http://www.ec.gc.ca/envirozine/default.asp?lang=en&n=70BF6FA1-1 http://library.thinkquest.org/16132/html/tornadoinfo/formed.html
Thunderstorms are created when warm air rises quickly. This air eventually cools in the atmosphere and precipitates. http://en.wikipedia.org/wiki/Thunderstorm
Floods are created when there is a lot of precipitation in a short period of time. The water can't drain out of the area quickly enough and so it builds up in a large mass of water. http://www.newsobserver.com/2011/05/27/1231177/heavy-thunderstorms-cause-flooding.html
Fog is created when water vapor condenses close to the ground. http://literaryi130.wordpress.com/2011/04/08/london-fog/
Snow forms when clouds are cold enough for the condensed water droplets to freeze in small icy crystals that fall to the ground. http://scotthand.org/?p=280
Rainbows are created when light shines through water vapor in the air. http://www.sodahead.com/fun/have-you-ever-seen-a-double-rainbow/question-1742451/
Sandstorms are caused by large gusts of wind in the desert. These gusts of wind pick up sand and sediment and pull it through the air. http://www.trekearth.com/gallery/Africa/Egypt/Delta/Giza/Giza/photo1094379.htm http://www.erh.noaa.gov/er/box/glossary.htm
Hurricanes form when ocean water rapidly evaporates, rises, condenses, and falls back into the ocean. http://www.hurricane-facts.com/
Seasonal changes in temperature create monsoons. In the summer, the temperature over land is much hotter than over sea, so the continental air masses rise, and the moist maritime air masses move towards the land to fill the space the continental air masses left. http://en.wikipedia.org/wiki/Monsoon
Hail is created when water droplets in clouds freeze and are then coated with layers of ice in an updraft. http://www.wunderground.com/wximage/viewsingleimage.html?mode=singleimage&handle=plapman&number=79
Kiera Turner
