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3 Answers

Sigmet

Asked by: 2922 views Flight Instructor, General Aviation, Weather

Non convective sigmet are assigned an alphabetic designator from N through Y (excluding S and T). Why S and T are excluded and whats the purpose of this alphabets?

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3 Answers



  1. Mark Kolber on Jun 29, 2016

    I’m completely making this up. WAG. Someone who knows will tell us how “educated” my guess is based on simply thinking about it and applying other aviation knowledge…

    The letter designation are used for the same reason ATIS uses letter designators – to differentiate them and their sequence.

    S & T are skipped for the same reason that it stops at Y and doesn’t use Z – to avoid confusion with Airmets S (IFR and obscuration), T (turbulence) and Z (icing)

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  2. humble and fly on Jun 30, 2016

    Mark is correct actually.

    To avoid confusion SIGMET can’t be assigned letter of S and T

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  3. Mark Kolber on Jul 04, 2016

    Thanks humble. Nice to know that “application” and “correlation” stuff really works!

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