Wireless Emergency Alerts — called WEAs — are free notifications delivered to your mobile device. To receive the alerts, you need to make sure you have not turned off those notifications.

LCG and the parish emergency agency say it's "a modern emergency alert notification system designed to deliver timely, critical updates to the public when it matters most." Watch Now .

When notices about a boil water advisory were sent to people in the Five Cities community Wednesday, three alert systems were used: Reverse 911, AlertSLO and the Wireless Emergency Alert System.

How to sign up for the new alert system. It's pretty simple — all you'll need to do is text 333111 with your county or borough name without the word county or any spaces or punctuation marks.

A new emergency and weather alert system is now available for New Yorkers. Through the free 333111 system, you'll receive text alerts from the New York State Division of Homeland Security and ...

Emergency alert systems "constantly changing & evolving" 03:48. When disasters strike, timing is everything -- from weather forecasts to warnings for those in the path of danger.