AIRMET

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An AIRMET, or Airmen's Meteorological Information, is a concise description of weather phenomena that are occurring or may occur (forecast) along an air route that may affect aircraft safety. Compared to SIGMETs, AIRMETs cover less severe weather: moderate turbulence and icing, sustained surface winds of 30 knots or more, or widespread restricted visibility. Today, according to the advancement of technology in civil aviation, the AIRMET is sent as IWXXM model. [1]

Contents

Types

AIRMETs are broadcast on the ATIS at ATC facilities, and are referred to as Weather Advisories. AIRMETs are valid for six hours. [2] NOTE: The definition has changed and no longer says "light aircraft"; AIRMETs are intended for all aircraft.

There are three types of AIRMET, all identified by a phonetic letter: S (Sierra), T (Tango), and Z (Zulu). [3]

For an authority to issue an AIRMET, applicable conditions must be widespread. "Widespread" means that the applicable area covers at least 3000 square miles. Because conditions across the forecast period can move across the area, it is possible that only a small portion of the area is affected at any time. AIRMETs are routinely issued for six-hour periods beginning at 0145Z during Daylight Saving Time and at 0245Z during Standard Time. AIRMETS are also amended as necessary due to changing weather conditions or issuance/cancellation of a SIGMET.

Dissemination and structure

Most AIRMET dissemination is done in the XML-based Graphical AIRMET (G-AIRMET) format, but some computer systems use the legacy text-based Traditional Alphanumerical Code (TAC). This is identical in structure to a SIGMET, with the only difference being that the SIGMET identifier in the First Line is replaced by the three type identifiers listed above. [4]

The TAC AIRMET is being retired [5] , and only G-AIRMETs will be disseminated for the continental US starting on or about January 27, 2025. [6]

See also

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References

  1. ↑ Latifiyan, Pouya; Entezari, Mojtaba (March 2024). "IWXXM Amendment (ICAO Meteorological Information Exchange Model)". CATC Robex and Statics Conferences - 2024. Tehran, Iran.
  2. ↑ ICAO Annex 3 Chapter 7
  3. ↑ Chapter 7. Safety of Flight
  4. ↑ "Pilot's Handbook of Aeronautical Knowledge". Federal Aviation Administration. Retrieved 17 September 2019.
  5. ↑ Dennstaedt, Scott. "Say Goodbye to the Traditional AIRMET" . Retrieved 26 November 2024.
  6. ↑ "Service Change Notice 24-92" (PDF). 26 November 2024. Retrieved 26 November 2024.


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