A tornado is a violently spinning column of air that can start to form during a thunderstorm, there 45,000 a day worldwide. Of course, not all thunderstorms bring about tornadoes and not all tornadoes bring about total destruction. The most destructive ones occur in India, Bangladesh, and "Tornado Alley" in the USA. The worst ever "twister" hit this area in March 1925, when a huge tornado travelled 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.