High Quality Content by WIKIPEDIA articles! VOLMET, or meteorological information for aircraft in flight, is the term applied to a worldwide network of radio stations that broadcast TAF, SIGMET and METAR reports on shortwave frequencies. In some countries, VOLMET stations broadcast on VHF frequencies too. Reports are sent using automated voice transmissions, in the upper sideband or J3E mode. As the name suggests, pilots on international air routes, such as North Atlantic Tracks, use these transmissions to determine what maneuvers to make to avoid severe storms or turbulence, as well as which procedures to use for descent, approach, and landing, such as a visual approach versus an instrument approach and the correct arrival procedure.