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Pre-authorized national, state or local government may send emergency alerts regarding public safety emergencies, such as evacuation orders or shelter in place orders due to severe weather, a terrorist threat or chemical spill, to WEA.

Alerts from authenticated public safety officials are sent through FEMA’s IPAWS to participating wireless carriers.

Participating wireless carriers push the alerts from cell towers to mobile devices in the affected area. The alerts appear like text messages on mobile devices.

Wireless Emergency Alerts (WEA) | FCC.gov