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Tornado

by Nadine

Tornado wind speeds mostly reach 40 mp/h (64 km /h) and 110 mph (177 km/h), are approximatley 250 ft (75m) across, and travel a few miles (several Kilometers) before dissipating.

Some reach wind speeds of more than 300mph, strech more than a mile across, and stay on the ground dozens of miles. Altough tornadoes have been seen on nearly every continent except Antarctica. They can also happen in Western and Southeastern Australia and also New Zealand. Also east of the Rocky Mountains during the spring and summer months of the year.

An average of 800 tornadoes a year are reported nation wide taking 80 deaths and over 1500 injuries along with them. A tornado is defined as a violently rotating column of air extending from a thunderstorm to the ground.

Thunderstorms deveop in warm moist air, in advance of eastward- moving cold fronts. These kind of thunderstorms often produce large hail stones, stong winds and fierce tornadoes.

Tornadoes in the winter and early spring are often associated with strong, frontal systems that form in the Central States and move east. Occasionally, large outbreaks of tornadoes occur with this type of weather pattern.

Several states may be affected by numerous severe thunderstorms resulting in tornadoes. During the spring in the Central Plains is when they can happen. Thunderstorms frequently develop along a “dryline”, which separates very warm, moist air to the west.

Tornado making thunderstorms may move, as the dryline moves east during afternoon hours. Once a tornado in Broken Bow, Oklahoma carried a sign 30 miles then dropped it in Arkansas!



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