Short answer. U.S. public alerts travel through FEMA's IPAWS 1. They reach you as Wireless Emergency Alerts on your phone, free and without subscription 2, through the Emergency Alert System on TV and radio 1, and on NOAA Weather Radio 1. Outdoor sirens are run locally, and there is no national siren code 1.
Which alert channels exist in the U.S.?
| Channel | What it does |
|---|---|
| Wireless Emergency Alerts (WEA) | Free, no subscription, geographically targeted messages to phones, with a unique sound and vibration repeated twice 12 |
| Emergency Alert System (EAS) | Alerts on TV, radio, satellite and cable; the President can address the nation within 10 minutes during a national emergency 1 |
| NOAA Weather Radio | Continuous 24/7 broadcasts from the nearest National Weather Service office, including non-weather emergency alerts via EAS 1 |
| FEMA App | Real-time National Weather Service alerts for up to five locations, and a shelter finder 13 |
| Outdoor sirens | One IPAWS channel among others; tones and meanings are set locally 1 |
What types of Wireless Emergency Alerts are there?
- National Alerts, issued by the President or the FEMA Administrator.
- Imminent Threat alerts.
- AMBER Alerts.
- Public Safety Messages.
Carriers may let users block Imminent Threat alerts, AMBER Alerts, or both 2.
Does FEMA approve the alerts it relays?
Ready.gov notes: "FEMA does not review, edit or approve alerts." 1
What do the sirens mean where I live?
There is no nationwide siren code: siren tones and their meanings are set locally, and Ready.gov publishes no national standard for them 1. Ask your local officials what your sirens mean and what you are expected to do when you hear them.
How can I make sure I get alerts?
Use more than one channel. Keep Wireless Emergency Alerts on your phone, keep a battery-powered or hand-crank radio and a NOAA Weather Radio with tone alert in your kit (see our U.S. kit list), and install the FEMA App for up to five locations 1. Write down in your family plan how each person will receive alerts.
Frequently asked questions
Do I need to sign up for Wireless Emergency Alerts?
No. WEA messages are free and require no subscription 2.
Can I turn off emergency alerts on my phone?
Carriers may let you block Imminent Threat and AMBER alerts 2. National Alerts from the President or the FEMA Administrator are one of the four WEA types 12.
Does NOAA Weather Radio carry non-weather emergencies?
Yes. It broadcasts non-weather emergency alerts through the Emergency Alert System 1.
Is there one siren signal for the whole country?
No. Sirens are run locally and their meanings are set locally 1.
Sources
- FEMA / Ready.gov — Emergency Alerts — https://www.ready.gov/alerts (accessed 2026-10-20)
- Federal Communications Commission — Wireless Emergency Alerts (WEA) — https://www.fcc.gov/consumers/guides/wireless-emergency-alerts (accessed 2026-10-20)
- FEMA — FEMA Mobile Products — https://www.fema.gov/about/news-multimedia/mobile-products (accessed 2026-10-20)
Turn this into action
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Sources
- FEMA / Ready.gov · Emergency Alerts checked 2026-10-20
- Federal Communications Commission · Wireless Emergency Alerts (WEA) checked 2026-10-20
- FEMA · FEMA Mobile Products checked 2026-10-20