A tornado is a Spanish word that means to twist or to turn. The word might not have as grave a meaning as what it depicts as one of the killer vehicles that nature employs that leaves widespread destruction in its path. As per definition, a tornado is usually caused due to the extremely low pressure that develops and a whirlwind that is created as a result. This results in a thunderstorm of severe levels.
Tornado winds have certain characteristics. For instance, they wind in such a storm usually turn in a counterclockwise direction. Funnel shaped columns of winds are formed in tornadoes, but these are not seen by the naked eye. The winds that rotate usually turn in a counterclockwise direction and touch the ground. However, what is visible to the eye is not the wind movement, but when debris is pulled up and swirled by these strong winds. The conditions of a violent tornado storm are usually picked up on weather detection system radars.
Often tornadoes are referred to as funnel clouds. Though these two terms are often used interchangeably, a funnel cloud is different by technical definition. Such a cloud usually does not touch the ground. A tornado is also described as a twister due to the rapid twisting motions that it displays. A tornado is known to be one of the most destructive and unpredictable forces of nature. It can be detected a few hours before it comes by. However, there are certain signs that usually preclude a tornado. There are violent storms that precede a tornado and there is a high wind, hailstorm that damages property as well. In certain cases, the storm might change course and it usually comes with a roaring sound, usually said to resemble the sound of an oncoming freight train.
The Fujita scale measures the intensity and strength of tornadoes in five categories. F1 stands for moderate strength, F2 means a storm of significant strength while F3 is severe, F4 devastating and F5 being incredible. The winds could reach a speed of 300 miles per hour. Among all the countries where tornadoes occur, Midwestern part of US receives tornadoes the most, higher than any part of the country.