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A special air-report:
  • A
    may trigger a SIGMET message.
  • B
    may be the reason for closing a part of an airway due to meteorological conditions.
  • C
    is used to produce better aerodrome forecasts (TAF).
  • D
    may be the reason for closing an airport due to meteorological conditions.

A special air-report (ARS) can be made by any aircraft, when encountering or observing weather phenomena that may affect safety as for example severe turbulence, icing or mountain waves, hail, cumolonimbus clouds, squall-lines, thunderstorms, sandstorms, volcanic ash cloud, volcanic activity or phenomena regarding 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.

  • Bottom line is, a special air-report is made by an aircraft when coming across adverse conditions and a SIGMET is a message which is transmitted by ATC to warn of such flying conditions.

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