All government-authorized broadcasters must carry Alert Ready warning, as of March 31, 2015.
With a unique sound and vibration, Wireless Emergency Alerts keep you in the know, wherever you are. Wireless Emergency Alerts (WEA) are emergency messages sent by authorized government alerting authorities through your mobile carrier.
You can opt-out of receiving WEA messages for imminent threats and AMBER alerts, but not for Presidential messages. With WEA, alerts can be sent to your mobile device when you may be in harm's way, without need to download an app or subscribe to a service. Therefore, an alert can reach cell phones outside of the actual warning area depending on the broadcast range of the cell towers which broadcast the alert.

Other sources include NOAA Weather Radio, news media coverage, the Emergency Alert System on radio and TV broadcasts, desktop applications, mobile applications, and other alerting methods offered by local and state public safety agencies. The Extreme alerts from the National Weather Service include warnings for tsunamis, tornadoes, extreme winds, hurricanes and typhoons.
WEA use radio technology to broadcast the alert from cell towers to mobile devices in the area of the threat. IPAWS also serves as collection point for non-weather alerts, such as civil and child abduction emergency messages which are issued by other emergency authorities. If you travel into a threat area after an alert is first sent, your WEA-capable device will receive the message when you enter the area.
FEMA has produced Public Service Announcements that demonstrate how wireless alerts save lives.

The Severe alerts from National Weather Service include warnings for flash floods and dust storms.
America’s wireless industry is helping to build a Weather-Ready Nation through a nationwide text emergency alert system, called Wireless Emergency Alerts (WEA), which will warn you when weather threatens. The NWS pushes our suite of warnings, advisories, and watches to a national collection point called the Integrated Public Alert and Warning System (IPAWS) The NWS specially marks our most critical NWS alerts for WEA distribution, so that when they reach IPAWS, they are pushed to commercial wireless carriers who broadcast the alert from cell towers in the threat area to your cell phone.

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