It's unclear why the FCC has delayed updating the wireless emergency alert system. ... That rule was set to go into effect this January, but it hasn't happened yet.

Now, they'll update the notification with a new system, called Rave Alert, offering targeted messages to specific communities, like what happened in Millheim, or issuing county-wide alerts.

If activated, the sirens indicate the Emergency Alert System is in effect, and you should tune in to local news for further instructions. The sirens cover an area from Cayucos to Nipomo Mesa, ...