Wireless Emergency Alerts (WEA) are emergency messages sent by authorized government alerting authorities through your mobile carrier. They do not require you to sign up. They are sent directly to your mobile phone when there is extreme weather, Amber Alerts and/or other threatening emergencies in your area. WEA use radio technology to broadcast the alert from cell towers to mobile devices in the area of the threat. More info on our WEA Fact Sheet (PDF).