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Extreme Weather By Kim Brasseur Types of Extreme Weather • • • • • Tornadoes Hurricanes Thunder and Lightening Blizzards Floods Tornadoes • Tornadoes are the most powerful, unpredictable and destructive weather system on earth. • A tornado is a violent rotating funnel-shaped column of air extending from a thunderstorm to the ground. • They can have wind speed up to 300 mph. • Tornadoes happen where dry, cold air masses mix with warm, moist air masses. • More tornadoes occur in the United States Hurricanes • A huge storm that measures several hundred miles in diameter • Hurricanes have two main parts • First is the “eye” of the hurricane, which is a calm area in the center of the storm. • second is the wall of the clouds that surrounds the calm eye. This is where the hurricane’s strongest winds and heaviest rain occur. • Hurricanes rotate in a counter-clockwise direction around the eye. • Hurricane winds can be 74 to 200 mph. • Hurricanes are born over warm, tropical oceans. • They are fueled by water vapor that is pushed up from the warm ocean surface. • http://www.youtube.com/watch?v=OEPZOC6YHUc Thunder • A thunderstorm is a storm with lightning and thunder. • Thunder is caused by lightning. • They are produced by a cumulonimbus cloud, usually producing gusty winds and heavy rain, and sometimes hail. • Thunderstorms are caused by rapidly rising and falling currents of air. • When a lightning bolt travels from the cloud to the ground it opens up a little hole in the air called a channel. • Once then light is gone the air collapses back in and creates a sound wave that we hear as thunder. Lightning • Lightning is a sudden, violent flash of electricity between a cloud and the ground, or from cloud to cloud. • A lightning flash, or bolt can be several miles long. • Lightning is so hot, with a average temperature of 34,00 degrees Centigrade, that the air around it suddenly expands with a loud blast. This is the thunder we hear. • Lightning occurs in hot, wet storms. Blizzards • A blizzards is a long-lasting snowstorm with strong winds, intense snowfall, and cold temperatures. • Winds of 35mph or greater, and little visibility. • Three things are needed to have a blizzard; cold air at the surface, lots of moisture, and lift. • When a mass of polar air and warm air meet, the polar air pushes the warm air up and settles in the atmosphere where the water vapor forms snow clouds. • The winds and low temperatures combine with the snow to create a blizzard. Flash Flood • A flash flood is the fastest moving type of flood. • They happen when heavy rain collects in a stream or gully, turning the normally calm area into an instant rushing current. • Flash floods appear and move quickly across the land, with little warning that it’s coming. • Flash floods are generally a result of heavy rainfall concentrated over one area. • Most flash flooding is caused by slow-moving Sources • • • • • • • • • • Information http://www.livescience.com/environment/lightning_science.html http://weatherwizkids.com/index.htm http://fema.gov/kids http://wwwworldstory.net/en/tunder.html http://weathereye.kgan.com/expert/blizzard/wnstroms.html http://www.theteachersguide.com/weather.html http://www.livescience.com/hurricanes/ http://www.extremescience.com/weatherport.htm http://library.thinkquest.org/3805/events/Bliz.htm Sources • Pictures • • • • • • http://www.howtosurviveit.com/tornado-natural-disaster-400a061807.jpg www.pntmc.org.nz/ photos/Wanganui/ pages/ Flood_2.html ed101.bu.edu/.../mattwall/Extreme%20Weather.htm www.flickr.com/ photos/blackwolve/ 1471494190/ https://www.novelmaker.com/index/genre_select... www.ehow.com/how_4027_prepare-home-hurricane.html www.sun-tek.com/ExtWthr.htm Remove frame • www.topnews.in/regions/greece • •