There are several instances that recur to the distinction between ordinary and extraordinary. For example wind. For instance:

Sukkah must withstand ordinary wind (Orach Chayim 630.10)

When one wind is considered ordinary and when extraordinary wind? There's a distinction, but not definition, in Bava Kama 45:

  • The prevailing wind is: ru'ach Metzuyah.
  • The unusual strong wind is ru'ach she'Eino Metzuyah.

Is there something that marks a difference between them? how to decide whether it is one or the other?

EDIT: Possible criteria to evaluate between prevailing and unusual wind were:

  1. Succah construction dictates unusual wind: local experience may have led to improve the construction of succah to resist the prevailing high winds. So, a wind that damaged the succah built according to the common practice was a unusual wind.
  2. The local elderly or writings dictates unusual wind: what the older people of the community remembered, or a written historical record, was an unusual wind.


  • It means your sukkah doesn't have to be so strong it can withstand a hurricane. – ezra Sep 15 '17 at 16:41
  • Right, but I'm wondering if there's any reference that deals more in detail with a definition of when one wind is considered ordinary and when extraordinary wind? – Oliver Amundsen Sep 15 '17 at 16:57
  • Is there a way to gauge that? I think it's more like when you look outside and see the leaves rustling in the trees to looking outside and seeing the trees bending. – ezra Sep 15 '17 at 17:09
  • Not really. I'm asking about a distinction. I added more details to question – Oliver Amundsen Sep 15 '17 at 18:46
  • 1
    I'm quite certain that there's a M.Y. question that addresses the main part of your question. I have to hunt for it. But, I recall that the term ru'ach Metzuyah is exactly according to your translation, i.e. "prevailing wind", meaning what the most common wind speed is in your area. If you live at the top of Mt. Washington, VT, the prevailing wind speed there is about 40 - 50 MPH. If you live in New York City, the prevailing wind is around 10 - 15 MPH. If you're uncertain what it is in your area, you can always contact a local meteorologist or in the U.S. view www.weather.gov. – DanF Sep 15 '17 at 19:28

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