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View Diary: A note on tornado intensity ratings (53 comments)

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  •  Neither scale is based on wind speed though (3+ / 0-)

    Estimated wind speed is one of the outputs of the scale, it's not how the rating is determined. Both scales are based on how much damage a tornado does. The EF scale just has a better estimate for the wind speed that would cause that damage.

    •  That's what I recall - the scale is graded on the (0+ / 0-)

      degree of damage done to a range of structures, from sheds to poured concrete buildings. Wind at any particular speed will have different effects depending on the integrity of the structure.

      If a range of structures is destroyed, this scale can provide a better estimate of intensity. It's also important to remember that tornado intensity typically varies along the path the funnel takes, and is not a constant. If the tornado hits mainly farmland, it may be more difficult to assess storm strength.

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