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Twin tornadoes can mow down small towns in minutes, and although unusual they can develop in several ways. Most tornadoes, either single or double, are associated with supercell thunderstorms, which have a large, vertical column of rotating air. When wind blows in different directions and at varying speeds, supercells tend to form tornadoes. This is where it gets tricky. Jane J. Lee has done
Supercells are one of the four major types of storm. These long-lasting thunderstorms are rare, and to say they pack a punch is an understatement. They often produce severe weather such as violent winds, hail and tornadoes. A characteristic feature of supercells is the presence of a mesocyclone, which is a deep rotating updraft. Although tornadoes are not inevitable with this type of storm, it is
A group of stormchasers captured some beautiful and terrifying footage of a supercell thunderstorm developing over Wyoming this weekend. As far as thunderstorms go, supercells are the least common, but they're responsible for most of the violent tornadoes in the U.S. In addition to extreme winds, they also dump torrential rain and hailstones that are bigger than golf balls -- causing flash