When a weather warning is issued for the area which a station covers, certain weather radios are designed to turn on or sound an alarm upon detection of a tone, issued for ten seconds immediately before the warning message.
When a weather warning is issued for the area which a station covers, certain weather radios are designed to turn on or sound an alarm after the third SAME header burst, or shortly after that third header. A 1050Hz tone is issued for ten seconds immediately before the warning message.