A violent tornado hit the southern part of Oklahoma, US, on Friday night, killing at least 15 people and injuring dozens, according to US media.

据美国媒体报道，当地时间10日晚，俄克拉荷马州南部受到一股猛烈的龙卷风袭击，目前造成至少15人死亡和数十人受伤。

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The ruin of the house was caused by a violent tornado.

一阵猛烈的旋风把房屋卷倒了。

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The area where the most violent tornadoes usually happen is known as "Tornado Alley."

VOA: special.2010.05.11

The difference is that on these violent tornado days, the balloon does not just rise in a leisurely way.

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"Yet it was a relatively ordinary violent tornado, " according to Brooks, an acknowledged expert on the climatology and probability of twisters.

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And in the most extreme cases, a violent tornado is born beneath that spinning white cloud of updraft that meteorologists call the supercell thunderstorm.

CNN: The making of a nightmare tornado