truly alarming

Amber alerts are serious business and I'm not making light of them here, especially because of what happened yesterday.  However I got a real scare of my own today from an Amber alert.  I was walking down the hall from my apartment to the elevator this afternoon when all of a sudden my cell phone gave off the loudest, shrillest most alarming noise I have ever heard from it.  I checked to see what was wrong and saw that an Amber alert had been sent to my phone. I don't know why or how.  I know I'm signed up to get school closing alerts so maybe it comes though the same system.  Anyway, the same message came through twice more, once while I was driving, once while I was parked waiting to pick up a granddaughter from school.  I'm really glad I wasn't driving when the alarm went off the first time. I probably would have driven off the road.  Probably not the intended result of those alerts.