OLMET, or meteorological information for aircraft in flight, is the term applied to a worldwide network of radio stations that broadcast TAF (Terminal Area Forecast). TAF is a format for reporting weather forecast information relating to aviation applying to five statute mile radius from the centre of the airport runway complex), SIGMET (Significant Meteorological Information, is a weather advisory that contains meteorological information concerning the safety of all aircraft) and METAR (format for reporting weather information) reports on shortwave frequencies. In some countries, VOLMET stations broadcast on VHF frequencies too.

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