Papers

1. Causes of Tornadoes (NSSL.NOAA.gov)
   "Thunderstorms develop in warm, moist air in advance of eastward-moving cold fronts. These thunderstorms often produce large hail, strong winds, and tornadoes. Tornadoes in the winter and early spring are often associated with strong, frontal systems that form in the Central States and move east. Occasionally, large outbreaks of tornadoes occur with this type of weather pattern. Several states may be affected by numerous severe thunderstorms and tornadoes." 02-07
   
   
2. Pictures of Tornadoes (ChaseDay.com)
   Provides a variety of sizes and shapes for tornadoes. 02-07
   
   
3. Tornadoes (NOAA.gov)
   "Tornadoes are one of nature's most violent storms. In an average year, about 1,000 tornadoes are reported across the United States, resulting in 80 deaths and more than 1,500 injuries. A tornado is a violently rotating column of air extending from a thunderstorm to the ground. The most violent tornadoes are capable of tremendous destruction with wind speeds of 250 mph or more. Damage paths can be in excess of one mile wide and 50 miles long." 02-07
   
   
4. Tornadoes (University of Illinois at Urbana-Champaign - DAS)
   "A tornado is defined as a violently rotating column of air in contact with the ground and pendent from a cumulonimbus cloud." 02-07
   
   
5. Tornadoes (Wikipedia.org)
   "A tornado is a violently rotating column of air which is in contact with both a cumulonimbus (or, in rare cases, cumulus) cloud base and the surface of the earth. Tornadoes can come in many shapes, but are typically in the form of a visible condensation funnel, with the narrow end touching the earth. Often, a cloud of debris encircles the lower portion of the funnel." 02-07
   
   
6. Tornadoes: Questions and Answers (NOAA.gov)
   "How long does a tornado last? Tornadoes can last from several seconds to more than an hour. The longest-lived tornado in history is really unknown, because so many of the long-lived tornadoes reported from the early 1900s and before are believed to be tornado series instead. Most tornadoes last less than 10 minutes." 02-07
   
   

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