Look to the the man channels that would broadcast Emergency Alerts.
Info came from someone who gets a heads up before most people.
I don't know for certain, but she hasn't be wrong yet.
I will be watching.
UPDATE:
https://i.imgur.com/yuf5pIH.jpg
All I saw was a test of the Emergency Alert System.
Still a hell of a coincidence. We'll see.
Well, it's 9:38 EST and no alert as of yet.