Weather broadcast

Further to the pre-flight meteorological information, pilots may received in-flight  meteorological information from the following sources:

  • ATIS (Automatic Terminal Information Service)
  • VOLMET (Voice weather broadcast)
  • SIGMET (Significant Meteorological Information)
  • AIRMET (Airmen’s Meteorological Information)

ATIS

ATIS is a continuous broadcast of recorded aeronautical information which contains essential information, that is weather information, active runways, available approaches, and any other information required by the pilots, such as important “NOTAM”. Pilots usually listen to an available ATIS broadcast before contacting the local control unit, in order to reduce the controllers’ workload and relieve frequency congestion.

The recording is updated in fixed intervals or when there is a significant change in the information, e.g. a change in the active runway.

Examples:

Information

Audio

  • Calvi Airport,
  • Information Lima,
  • At One Neiner Five Zero Zulu,
  • Expect arrivals runway One Five Right,
  • Transition Level four Five,
  • Wind Zero four Five at Five knots,
  • Broken at Five thousand feet,
  • Visibility Five kilometers,
  • Temperature Two Eight,
  • Dew Point Minus Two,
  • Q N H One Zero Zero Six,
  • Caution : Wind shear advisory is in effect,
  • Confirm Information Lima on first Contact

Information

Audio

  • Meaux Airport,
  • Information Oscar,
  • At One Seven Three Two Zulu,
  • Expect arrivals runway Two Six Left,
  • Transition Level Two Five,
  • Wind Zero Seven Five at Twenty knots,
  • Overcast at Eight thousand feet,
  • Visibility Eight kilometers,
  • Temperature Two Three,
  • Dew Point Minus Seven,
  • Q N H One Zero One Two,
  • Caution : Frenquency One Two One decimal Four is out of service,
  • Confirm Information Oscar on first Contact

VOLMET

A VOLMET broadcast is a worldwide automated voice transmission that pilots on international routes, such as North Atlantic Tracks, use to avoid storms and turbulence, and to determine which procedures to use for descent, approach, and landing.

It contains the following information:

  • Aerodrome identification
  • Surface wind
  • Visibility
  • RVR if applicable
  • Weather
  • Cloud
  • Temperature
  • Dew point
  • QNH
  • Trend if applicable

SIGMET

A SIGMET is an advisory that contains meteorological information concerning a significant weather hazard happening in the area of concern and important for the safety of all aircraft.

AIRMET

An AIRMET is a concise description of a weather phenomenon occurring or forecast along an air route and that may affect aircraft safety. Compared to a SIGMET, an AIRMET covers less severe weather: moderate turbulence and icing, sustained surface winds of 30 knots or more, or widespread restricted visibility.