They are sold at most electronics stores, including Radio Shack and Amazon.com. The National Weather Service will send a 1050 Hz tone alarm before most warning and many watch messages are broadcast.

The National Oceanic and Atmospheric Administration is responsible for broadcasting the signals used in weather radios ... 550 MHz but the tones are also broadcast on TV and Radio alerts.

There's a significant problem facing tens of thousands of north Missourians: multiple NOAA weather radio stations covering ...