You've heard the sound and the interruption - "This is a test of the National Emergency System," along with that irritating noise. 

If you're listening to almost any American radio station next Nov. 17th, you're going to hear it again, presumably at the exact same time. The nationwide test is set to be held at exactly 2:20 PM local time all across the nation. 

The outage won't last long, but here's the announcement you'll be hearing in the afternoon on any station you might be tuned into.

“This is a nationwide test of the Emergency Alert System, issued by the Federal Emergency Management Agency, covering the United States from 2:20 to 2:50 hours ET. This is only a test. No action is required by the public.”

It's the first full nationwide test on radio down south since 2023.