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. 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. You can opt-out of receiving WEA messages for imminent threats and AMBER alerts, but not for Presidential messages.
The Extreme alerts from the National Weather Service include warnings for tsunamis, tornadoes, extreme winds, hurricanes and typhoons.
WEA messages are broadcast using radio-like technology from cell towers in, and sometimes around, the actual warning area.

FEMA has produced Public Service Announcements that demonstrate how wireless alerts save lives.
The NWS pushes our suite of warnings, advisories, and watches to a national collection pointcalled 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. 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. WEA use radio technology to broadcast the alert from cell towers to mobile devices in the area of the threat. Message frequency depends on the number of imminent threats to life or property in your area. The Severe alerts from National Weather Service include warnings for flash floods and dust storms.

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.
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.
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.

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