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| | Tornado (Site not responding. Last check: 2007-10-10) |
 | | The word "tornado" comes from the Spanish or Portuguese verb tornar, meaning "to turn." The phenomenon appears in storms all around the world, though they most commonly occur in a broad area of the American Midwest and South known as Tornado Alley, but some other countries see the storms occur in even higher densities. |
 | | Tornadoes can be nearly invisible, marked only by swirling debris at the base of the funnel, though some nocturnal tornadoes have been observed glowing diffusely[1] (http://www.science-frontiers.com/sf105/sf105p11.htm). |
 | | However, tornadoes do occur throughout the world; the most tornado-prone region of the world, as measured by number of tornadoes per unit area, is the United Kingdom, especially England [3] (http://www.torro.org.uk/severeweather/tornadofaqs.htm). |
| www.centipedia.com /articles/Tornado (1641 words) |
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