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Within a short interval, several flight crews report that they have experienced strong clear air turbulence in a certain airspace. What is the consequence of these reports?
  • A
    The responsible aviation weather office will issue a SPECI
  • B
    The responsible aviation weather office will issue a storm warning
  • C
    The airspace in question, will be temporarily closed
  • D
    The responsible aviation weather office will issue a SIGMET

ICAO Annex 3

SIGMET information. Information issued by a meteorological watch office concerning the occurrence or expected occurrence of specified en-route weather phenomena which may affect the safety of aircraft operations.

According to ICAO Annex 3, a SIGMET will be issued for:

  • thunderstorm;
  • heavy hail;
  • tropical cyclone;
  • freezing rain;
  • severe turbulence (not associated with convective cloud);
  • severe icing (not associated with convective cloud);
  • severe mountain waves;
  • heavy sand/dust storm;
  • volcanic ash cloud.

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