NOAA weather radios. They receive pretty much everywhere people inhabit in the CONUS. go off like alarm clocks when the NWS issues watches / warnings / advisories.

Don’t rely on one layer of notification. That layer will fail in an emergency. Have a backup plan to the backup plan. Hell, even a selected broadcast media in every market is required to rebroadcast NOAA alerts. Turn on the TV or fm radio for background noise when the weather is squiffy. The alert tone will get your attention.