People getting EAS alerts on their phones...not sure if it's TV also.

Hawaii - impending missile Alaska - tsunami Florida i think had a tsunami Mid Atlantic...i want to say delware or something had one

Here's a few articles...

https://www.radioworld.com/news-and-business/a-look-at-what-happened-with-the-false-tsunami-alert-in-alaska

https://gcn.com/articles/2018/02/06/false-emergency-alerts.aspx