is most common along the range of the Rocky Mountains, the Plains, and the Western States. Tornadoes may appear nearly transparent until dust and debris are picked up. Occasionally, two or more tornadoes may occur at the same time. Today, the development of Doppler radar has made it possible, under certain circumstances, to detect a tornado's winds with radar. However, human beings remain an important part of the system to detect tornadoes because not all of them occur in situations where radar can "see" them. In addition, ordinary citizen volunteers make up what is called SKYWARN (www.skywarn.org) network of storm spotters who work with their local communities to watch out for approaching tornadoes, so that those communities can take appropriate action in case of a tornado. Spotter information is relayed to the National Weather Service, which operates the Doppler radars and which issues warnings, usually relayed to the public by radio and television, for communities ahead of the storms using all the information they can obtain from weather maps, modern weather radars, storm spotters, monitoring power line breaks, and so on.These are all important tornado facts and reasons of why this phenomenon occurs. Tornadoes are natural disasters that we can not do anything about, we just have to learn to live with them and be smart about how we approach them. There is no preventing a tornado from occurring so we must merely take all the precautions so we will be safe. There are some "surprises" every year, when tornadoes form in situations that do not look like the right conditions in advance, but these are becoming less frequent. Once a tornado is formed and has been detected, warnings can be issued based on the path of the storm producing the tornado, but even these cannot be perfectly precise about who will or will not be struck....
