Plain English Meaning
A non-stop weather warning broadcast that pilots could tune in on a navigation radio to hear about dangerous weather in their area without having to call anyone or change frequencies.
Full Definition
A continuous broadcast of summarized hazardous weather information transmitted over selected VOR navigation frequencies. The broadcast contains the latest AIRMETs, SIGMETs, Convective SIGMETs, Center Weather Advisories, urgent PIREPs, and severe weather forecast alerts that affect the area within roughly 150 nautical miles of the broadcasting station. : HIWAS was discontinued in 2020 by the , but the term still appears in legacy , older training , and .