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Tornadoes form in unusually violent thunderstorms when there is sufficient (1) instability, and (2) wind shear present in the lower atmosphere. Instability refers to warmer and more humid than usual conditions ... This is the same process that causes an ice skater to spin faster when she pulls her arms in toward her body.
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www.weatherquestions.com/What_causes_tornadoes.htm
www.weatherquestions.com/What_causes_tornadoes.htm
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Although tornadoes occur in many parts of the world, these destructive forces of nature are found ... What causes tornadoes? ... Occasionally, tornadoes develop so rapidly that advance warning is not possible. Remain alert for signs of an approaching tornado. Flying debris from tornadoes causes most deaths and injuries.
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www.nssl.noaa.gov/NWSTornado/
www.nssl.noaa.gov/NWSTornado/
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Weather News Section Front ... 2006 forecast: 4-6 'major' hurricanes ... Hurricane tip: Don't focus on black line...
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www.msnbc.msn.com/id/9007188/ns/weather-weather_news
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A basic guide to what causes tornadoes ... Then, if other conditions are right, the thunderstorm could spin out one or more tornadoes. ... Supercells, which are long-lasting, large thunderstorms are responsible for most strong tornadoes. They are most likely to form in areas where winds at different levels of the atmosphere...
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www.usatoday.com/weather/wtwist2.htm
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Tornadoes can occur at any time of year and are most likely to occur between 3:00 and 9:00 pm. But they've been known to occur at all hours of the day and night. ... Thunderstorms develop in warm, moist air, usually in advance of cold fronts and can produce tornadoes when conditions are favorable. Things to look out...
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www.wate.com/Global/story.asp?S=367963
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The NOAA National Severe Storms Laboratory provides in-depth information about tornadoes. The science behind tornadoes is explained, and preparedness and safety tips are provided. Printer-friendly safety information is available.
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www.metlife.com/Applications/Corporate/WPS/CDA/PageGene...
www.metlife.com/Applications/Corporate/WPS/CDA/PageGenerator/0,4773,P1752,00.html
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