Tornado Terror

There is simply no natural phenomenon more terrifying than a tornado. ‘Twisters’ as they’ve become known, appear almost without warning at any time day or night. They can also occur any month during the year providing the conditions are right.
Around 1,000 tornadoes touch down in the United States of America annually. Tornadoes frequently cause devastation to farms, towns, and even cities whenever and wherever they may strike. Fifty-two people have been killed by tornadoes in 2002 alone and many hundreds more have been injured.
Eye witnesses who’ve had close brushes with these furious spiralling winds describe their approach like the roar of a jet engine. Tornadoes blast debris in every direction – often at speeds of hundreds of kilometers per hour. Most houses are made to withstand wind speeds of up to 110 km/h, but a tornado doesn’t even register unless it reaches 117 km/h.
Tornadoes are generated by a large variety of weather patterns. However, most meteorologists agree that tornadoes happen when warm and cool airstreams collide to create a rotating area of low atmospheric pressure.
Air within a low pressure front has a natural tendency to rise and creates a strong upward draught. This draws in surrounding warm air from ground level, causing it to spin faster and faster sucking surrounding air up like a vacuum cleaner. In extreme cases these powerful air currents can reach speeds of 482 km/h.
The most powerful tornadoes occur when ‘super-cell’ storms occur. These rotating thunderstorm clouds can be clearly seen on weather radars as a well-defined circulation that meteorologists call a mesocyclone. The giant super-cell thunderstorm clouds which rise to heights greater than Mount Everest.
The intensity of a tornado is determined by the Fujita scale, named after the late great tornado scientist, Dr. Fujita of Chicago University. Twisters are measured by the amount of damage...

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