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Name the 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 low-level aircraft operations and which was not already included in the forecast issued for low level flights in the Flight Information Region concerned or sub-area.
  • A
    AIRMET information.
  • B
    SIGMET information.
  • C
    An en-route Meteo Report.
  • D
    NOTAM information.

ICAO Doc 4444
Chapter 1. Definitions

AIRMET 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 low-level aircraft operations and which was not already included in the forecast issued for low-level flights in the flight information region concerned or sub-area thereof.

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

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