A tornado is a violently spinning column of air that can start to form during a thunderstorm, there are about 45,000 a day worldwide. Of course, not all thunderstorms bring about tornadoes and not all tornadoes bring about total destruction. The most destruction ones occur in India, Bangladesh, and "Tornado Alley" in the USA. The worst ever "twister"his this area in March 1925, when a huge tornado travel led across Missouri, Illinois and Indiana, killing 695 people and injuring a further 2,027.
A blizzard is another natural phenomenon that affects North America. It is a deadly mixture of wind, snow, and freezing temperatures. Muscles and internal organs then fail to work when body temperature falls below 86°F. In the USA, blizzards are quite common, with winds travelling at up to 40 mph.
It is believed that glodal warming , which is causing ice caps to melt, will be the cause of more blizzards in the future. Even Britain may experience blizzards as violent as the one which hit New York, Washington, Boston and Philadelphia in January, 1996. These cities decame completely paralyzed when snow up to 30 inches deep and weighing a total of five billion tons covered an area 500 miles long.