Please, speak slowly and clearly.
Tornadoes: it is a violent wind movement. They are also called twisters or cyclones. Most people recognize them as a towering black funnel extending downward from the base of a large cumulonimbus cloud. It rotates at speeds up to three hundred miles per hour (480 kpm) or in some rare cases, even faster. In the center of the tornado, the air pressure is very low in comparison to surrounding air pressure.
The speed of the wind is the primary cause of deaths and destruction of property. Many people are killed by flying objects and debris (missiles). They happened In certain parts of the world Australia, the Midwestern and Southern of United States
They also occur more frequently in the spring and summer months. Tornadoes usually occur as part of a severe thunderstorm and often come in advance of cold fronts, however, they can also occur (although less frequently) ahead of warm fronts, and even behind cold fronts.
The greatest killer tornado in the United States occurred during the year 1925 in Indiana, Illinois, and Missouri. It killed six hundred ninety five people and injured over two thousand.
