Tornado family
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Often mistaken for single long track tornadoes, Tornado families are a series of tornadoes which occur along a similar path. Spawned by the same supercell, these families can cover a short span or a vast distance. Sometimes evidenced by breaks in the damage path, expert analysis is necessary to determine whether or not damage was created by a family or a single tornado. Some tornado damage remains a mystery even today due to a lack of evidence. The Tri-State tornado is one such tornado. It could either have been the longest single tornado recorded, or a family of tornadoes.
[edit] References
The Tornado Project (1999). The Tornado Project's Terrific, Timeless and Sometimes Trivial Truths about Those Terrifying Twirling Twisters!. Retrieved on 2007-03-20.