Calm: Difference between revisions

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Latest revision as of 16:36, 26 January 2012



calm

  1. The absence of apparent motion of the air.

    In the Beaufort wind scale, this condition is reported when smoke is observed to rise vertically, or the surface of the sea is smooth and mirrorlike. The National Weather Service reports a wind as calm when it is determined to have a speed of less than three knots.


  2. See calm belt.


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