Thread: Weather Joplin virtually destroyed by tornado
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Old 05-23-2011, 03:41 PM   #499
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Quote:
Originally Posted by DaFace View Post
Technically, the classify them based on the types of damage caused rather than raw wind speed. That's because the wind is only part of the issue. Pressure differentials make a big difference as well.

I'm NOT an expert on this, but my understanding is that it's things like "snapped branches = one level, de-barked trees = another" rather than a strict definition.
IIRC, the debris type enters the mix. I remember something about 2x4s being embedded into tree trunks, or something.
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