Most tornadoes have wind speeds between 40 mph and 110 mph, are approximately 250 feet across, and travel a few miles before dissipating. Some attain wind speeds of more than 300 mph, stretch more than a mile across, and stay on the ground for
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A rare, mother ship cloud formation hovers over Childress, Texas. Tornado-chasers there covered seven hours and 150 miles (241 kilometers) tracking the supercell thunderstorm that produced this cloud formation.
Orographic lift occurs when an air mass is forced from a low elevation to a higher elevation as it moves over rising terrain. As the air mass gains altitude it expands and cools adiabatically. This cooler air cannot hold the moisture as well as warm air can, which effectively raises the relative humidity to 100%, creating clouds and frequent precipitation.
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