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Staff Writer

Andrew Bridges

Andrew Bridges' Articles

  • Twister science

    "Tornadoes devastate South, killing at least 251”

    What could be more forceful than this real news headline?

    The tornadoes that inspired it.

  • Why a tornado forms

    A tornado is a violently rotating column of air extending from the ground to a thunderstorm above. Tornadoes can leave a path of damage more than 1.6 kilometers (1 mile) wide. They can travel more than 160 kilometers (100 miles) over land. And while some touch down briefly, others can last for more than an hour.

    Tornadoes start with a thunderstorm. But they also require other ingredients, such as instability. Air is unstable when it is warmer closer to the ground than it is higher up. That warm air will rise, just as a hot-air balloon does.

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