Emergency Alerting Systems
Local Alerting
Post Disaster Updates
Local/National Alerting Systems
NOAA WEATHER RADIO
NOAA Weather Radio All Hazards (NWR) is a nationwide network of radio stations broadcasting continuous weather information directly from the nearest National Weather Service office. NWR broadcasts official Weather Service warnings, watches, forecasts and other hazard information 24 hours a day, 7 days a week. [https://www.nws.noaa.gov/nwr/]
You can find a few options here for weather radios on Amazon
Emergency Alert System (EAS)
In an emergency and power is available and you have an antenna, turn on the TV. The Emergency Alert System (EAS) is a national public warning system that requires broadcasters, satellite digital audio service and direct broadcast satellite providers, cable television systems, and wireless cable systems to provide the President with a communications capability to address the American people within 10 minutes during a national emergency. [ready.gov]
EAS FactSheet: FEMA
Wireless Emergency Alerts
Wireless Emergency Alerts (WEA) are emergency messages sent by authorized government alerting authorities through your mobile carrier. [FEMA]
Check with your phone and carrier for support.