National Weather Service Alerts Do You Have A Weather/hazard Alert Radio?

Do you have a weather/hazard alert radio? - national weather service alerts

The tornadoes caused widespread damage, injuries and death last night in several communities in the United States. On Sat, 4 January, a dam at 4.00 and flooded a small city in Nevada. If a similar emergency in your community in their sleep, how do you know? Do you have a / Hazard Weather Radio?
The U.S. National Weather Service issues warnings and alarms available devices. I wonder how other countries advise their citizens too.
We have our warning radio since 1998, when 43 people were killed by tornadoes that went through just before 2.00 Clock