Tornadoes are known as one of the most damaging disasters. A tornado is a very powerful column of winds which spirals around a center of low atmospheric pressure. A tornado will look like a large black funnel which hangs down from a storm cloud.
The name "tornado" derives from the Latin "tonare". It means "to thunder" While the Spanish developed the word into "tornear" which means "to turn or twist". This is why a tornado is sometimes called twister or cyclone.
The winds inside a twister can spin around at speeds up to 500 miles an hour, but it usually travels at roughly 300 miles an hour. This speed twisting makes a tornado the most dangerous storm.The average tornado has a diameter of about 200 to 300 yards. The smaller tornadoes are known as satellite tornadoes. These small offspring, about 50 yards across, can be very fierce and do lots of damage. The forming of a tornado can be very quick. Sometimes it can form in a minute or less. A tornado can travel across the ground at high speeds, then it can suddenly vanish. Most tornadoes last less than twenty minutes and travel less than 15 miles. However, the super storms sometimes travel over 100 miles before they are exhausted.
Before tornado happens, it has several signal. First, the sky seems dark. Then happen ice rain around the area, usually 20-25 minutes. After that, the situation will calm, but the sky become darker. Fourth, cloud moving around the area. Fifth, the sound of tornado heard. At the beginning, the sound like water fall, but in the process of time it will change until like jet plane which is very loud. A tornado usually move from southwest to north east.
The process of tornado begin with storm followed by rain, thunder and lightning. When the temperature of the soil go up, the hot and moist air start to go up too. Then, when warm, the moist and cold air fill up the dry air. That upraised up, enter to the upper air layer. A thunderbolt cloud begin to form in this phase. The move of air go up is very fast. Wind from side cause the different direction and form a very very strong rotation.
Most of tornado happens in America. In America, most of tornado happen in tornado alley in middle-west America. Other area which generally happen tornado are South Canada, South Africa, East and south Asia, Middle Europe, Italy, West Australia, New South Wales, and Indonesia. In Indonesia, usually happen in Sumatra and Java.
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