Weather radio services are broadcast services focused on delivering weather alerts to people living in different areas. In the US, NOAA (National Oceanic and Atmospheric Administration) is in charge of keeping people up to date with everything that is happening in their areas, weather and non weather related. Information on forecasts, climate, and weather events is broadcast via these special radio services. What people need in order to receive this information is a type of radio capable of receiving the weather band frequencies. In case of alerts, these radios are switched to the weather band or even turned on, and people can learn in time whether there is a tornado or a really bad storm coming their way.
Messages regarding all kinds of alerts are delivered by NOAA via these weather radios. Alerts include information on tornadoes watch and warning, severe thunderstorms, flood watch, flood warning, special marine warning, winter storm warning, blizzard warning, ice storm warning, and high wind warning.
Non-weather events are also included by NOAA in their bulletins. For instance, AMBER alert messages are transmitted via the same services, so that more people can send valuable information to the police, in case they have information on child abductions. Civil emergencies are treated the same, and administrative messages can be transmitted by NOAA. Other hazardous events like earthquakes, fires, nuclear plant warning, radiological hazard, 911 service outage, are included as alerts that must be delivered fast and received by the population in the affected areas.
Weather radio alerts can save lives and minimize the damages caused by weather or non-weather hazardous events. While NOAA does not sell any kind of weather radios, there are many manufacturers on the market that make such radios, so you can always stay up to date with what happens in the area you live in.
Sources I used: