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    Tropical cyclones

    7:17 PM, Sep 9, 2010   |    comments
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    There are 4 stages to a Tropical Cyclone:Disturbance, Depression, Tropical Storm & Hurricane. A disturbance is just that, or a tropical wave of energy. When there is a closed circulation noted and winds below 38 mph it is a depression. Winds 39mph or over make it a Tropical Storm. This is when the cyclone is given it's name. Winds over 74mph make it a Hurricane.

    Names are recycled every 7 years and are usually of English, Spanish or French origin. These are the countries or territories most affected by the storms.

    Vertical speed shear caused by the friction of land can produce tornadoes. Ed illustrates why and has much more in the attached video.

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