The National Geographic Society aims to be an international leader for global conservation and environmental sustainability. Most tornadoes are 400 to 500 feet (122 to 152 meters) wide, travel four or five miles (six to eight kilometers) and last just a few minutes. It's time to take shelter, gang - because here at National Geographic Kids, we're about to learn all about one of nature's most powerful and destructive forces! Tornadoes peeled roofs off homes, tossed big-rigs in the air, and left flattened tractor trailers. In fact, they can be invisible until they pick up dust and debris, or a cloud forms within the spinning funnel.10) The formation of a tornado is so complex that scientists still don't completely understand it.

And what's more, the unpredictability of tornadoes makes them difficult - and dangerous - to study.
Follow members of a National Geographic team as they careen into the hearts of storms and take a closer look at tornadoes and the phenomenal forces that drive them. In extreme cases, however, they can last several hours and cross distances over 150km!5) Tornadoes are measured using the Fujita Scale (or F-scale), ranging from F0 to F5, with F5 being the strongest and most destructive.6) The deadliest tornado ever recorded was in Bangladesh in 1989. Manitoba Province, Canada, June 22, 2007—A tornado touches down near the small town of Elie, about 31 miles (50 kilometers) west of Winnipeg (Manitoba map). Some may appear as wide funnel-shaped clouds, others as thin rope-like swirls stretching from the ground to the sky.4) The duration of tornadoes, and the distance they travel, varies.

As it travelled through the Dhaka region of the country, more than 20 villages were destroyed and around 1,300 people were killed.7) Most of the world's tornadoes occur in the United States in what's known as Tornado Alley. The storm was among seven confirmed tornados that struck southern Manitoba over June 23 weekend, according to the government agency Environment Canada.

Personal emf protection product
Communicating in times of crisis
Business emergency evacuation plan
What to do in a tornado


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