Tuesday, August 25, 2015

Hurricanes, typhoons, and tornados

Hurricane image from wikia

With winds over 72 mph, a hurricane is a violent spiral that originates over tropical seas. This name is used in the Atlantic and the Caribbean. The Pacific term is typhoon. Over land, severe thunderstorms can produce whirling funnel- cloud storms called tornadoes or twisters. Winds may blow up to 300 mph (480 kph) and can lift animals, cars and even mobile homes into the air.
Tornadoes sometimes come with little warning;  they are often preceded by a period of stillness, and clear air may be visible behind them.

They may be accompanied by hail, thunder and torrential rains, and the sound of roaring.They are measured on the EF scale, 5 being strongest.

Over water, they are called waterspouts. These winds are seen mostly in a swath of central North America called Tornado Alley.

Right: a 1999 tornado in Manitoba from whyfiles

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