NOAA Weather Radio
NOAA Weather Radio (NWR) is a network of radio stations broadcasting continuous weather information directly from a nearby National Weather Service (NWS) office. It is operated by the NWS, an agency of the National Oceanic and Atmospheric Administration (NOAA) within the United States Department of Commerce. NOAA Weather Radio broadcasts National Weather Service warnings, watches, forecasts and other hazard information 24 hours a day. It also broadcasts alerts of non-weather emergencies such as national security, natural, environmental, and public safety through the Federal Communications Commission's (FCC) Emergency Alert System.
More information can be found at the NOAA Weather Radio site here