Alarm Systems in the USA: Wireless Emergency Alerts (WEA), EAS, and Sirens – What They Mean and What to Do (2026)

The loud, piercing sound of a phone and a message in English on the screen – for a Pole in the USA, the first Wireless Emergency Alert (WEA) can be surprising. Yet, it is one of the most effective warning systems in the world that truly saves lives: it warns of tornadoes, flash floods, fires, or child abductions. This guide explains in Polish how the American alarm system works, what the sounds mean, what cannot be turned off, and what to do step by step. Based on official sources (FCC, FEMA, ready.gov, NWS). Do you live or visit Poland? Check out the twin guide on the Polish system: Alert RCB, sirens, and RSO.

Last verified: July 21, 2026 (sources: FCC, FEMA/IPAWS, ready.gov, National Weather Service). Informational material – in real danger, follow current announcements from authorities and call 911.

In Brief – Remember This One Thing

Components of the American Warning System

Everything is coordinated by IPAWS – a federal FEMA system that disseminates warnings through several channels simultaneously:

WEA – How the Phone Alert Works

WEA consists of short messages sent by authorized agencies (federal, state, local, tribal) through the IPAWS system and cellular networks to all phones in a designated area. Key features confirmed by the FCC and NWS:

• This is not an SMS – it is a broadcast ('cell broadcast') to the tower, received by every compatible phone within range. Therefore, it works even when the network is congested and regular SMS or calls do not go through.
• Anonymous – the system does not use your number, does not know who holds the phone, and does not track anyone.
• No app or registration required – practically every newer phone automatically receives WEA.
• Precise targeting – modern phones receive alerts exactly in the area of danger (with an accuracy of about 160 m), so an alert from a neighboring county will not wake you up.
• Length: up to 360 characters on newer networks (LTE and newer); on older ones – 90 characters. The '90-character limit' is outdated information.
• Language: currently, it reliably works in English and (on phones set to Spanish) in Spanish. From 2025, the FCC is expanding support to several of the most common languages in the USA plus American Sign Language, but implementation is spread over ~30 months and by mid-2026 it is not yet complete – alerts in Polish are currently not available.

WEA Alert Categories – and What You Can Turn Off

This is the most commonly confused aspect. Here are the current categories:

Will the alert sound when the phone is silenced?

Yes. National alerts (National) and imminent threat alerts (Imminent Threat) play a loud signal and vibration even when the phone is silenced and in 'Do Not Disturb' mode – this is intentional, as they warn of life-threatening situations. You can silence the currently sounding alert with the volume or power button (the content remains on the screen), but you cannot preemptively make these alerts silent. Do not believe the myth that 'silent mode turns them off' – it does not.

What the Sounds Mean and What to Do

EAS – Alert on Radio and Television

EAS is a system that interrupts programming on radio, terrestrial television, cable, and satellite with an alarm message. You will recognize it by distinctive sounds: a sharp, 'screeching' data sequence (three series of digits), followed by a two-tone attention signal (853 Hz and 960 Hz simultaneously), and then a voice message. EAS and WEA are powered from the same source (IPAWS) – they are two ways to deliver the same warning: through waves (EAS) and through phones (WEA). The national level of EAS can only be activated by the President; the system is also used by the National Weather Service for weather warnings.

NOAA Weather Radio – For Weather-Affected Areas

NOAA Weather Radio is a nationwide network of transmitters broadcasting warnings 24/7 directly from the nearest National Weather Service office – over 1,000 transmitters covering all 50 states, coastal waters, Puerto Rico, and U.S. territories. It broadcasts on seven VHF frequencies (162.400–162.550 MHz) and requires a special receiver (NOAA weather radio, often with a tone alarm). Despite its name, it warns not only about weather but also about 'all hazards': chemical contamination, earthquakes, AMBER alerts, or failures of the 911 system. It is the most reliable source when power and internet go down – therefore, it is advisable to have such a radio in tornado, hurricane, or flood-prone areas.

National Tests

The system is periodically tested. The last national test of WEA + EAS took place on October 4, 2023 (the message was roughly: 'THIS IS A TEST of the National Wireless Emergency Alert System. No action is needed.'). No national test was conducted in 2024 and 2025. According to the law (IPAWS Modernization Act), a national test must occur at least once every three years, so the next one is legally due by October 2026 – but as of July 2026, FEMA and FCC have not yet announced an official date. Check the current date on fema.gov and fcc.gov. Regardless, radio and TV stations conduct weekly and monthly EAS tests, and NWS tests NOAA Weather Radio (usually on Wednesdays). State/local WEA tests are optional – you will only receive them if you turn on 'Test Messages' yourself.

Sign Up for Local System (Reverse-911)

WEA is a federal system, but many counties and cities operate their own voluntary notification systems (known as reverse-911): Nixle, Everbridge, CodeRED, Smart911, AlertSense, and similar. You sign up by providing your phone, email, and address, and then you receive local alerts (road closures, evacuations, water contamination) that WEA does not cover. It is definitely worth signing up – search online: '[your county/city name] emergency alerts sign up'. This is one of the best things you can do for your family's safety in the USA.

What to Prepare in Advance (ready.gov)

The official government guide ready.gov recommends that every household have a preparedness kit ready in case of emergencies (for evacuation at least for 3 days, and at home ideally for 2 weeks):

• water – about 1 gallon per person per day, a supply for several days,
• non-perishable food (for several days) + can opener,
• battery-operated or hand-crank radio (preferably with NOAA),
• flashlight and extra batteries,
• first aid kit,
• prescription medications and basic ones,
• charger/power bank for the phone,
• cash,
• documents and their copies (passport, green card, insurance) in a waterproof case,
• whistle, thermal blanket, warm clothing.

Numbers and Contacts

FAQ

Do I need to install an app to receive WEA?

No. WEA operates at the cellular network level (cell broadcast) – a WEA-compatible phone (practically every newer one) automatically receives the alert, without an app, account, or providing a number.

Does WEA use my phone number / is someone tracking me?

No. It is a broadcast to the tower in the area, not a message to your number. The system does not know who has a given phone and does not collect your data.

I received an alert in English and didn't understand anything – what should I do?

WEA currently comes in English (and in Spanish on phones set to Spanish). It is worth knowing a few key phrases: 'Tornado Warning' (tornado warning – seek shelter immediately), 'Flash Flood Warning' (flash flood – flee to higher ground, do not drive into flooded roads), 'Evacuate' (evacuate), 'Shelter in place / Take shelter' (shelter in the building), 'Boil water' (boil water). After receiving an alert, check weather.gov or turn on local TV – you will find details there.

Can I turn off these alerts because they wake me up?

Weather, AMBER, and public alerts – yes, in phone settings. But we advise against turning off imminent threat warnings – they warn of tornadoes or floods. National alerts (National/Presidential) cannot be turned off anyway.

How does WEA differ from the Polish Alert RCB?

Both send warnings to phones in the affected area without registration. The technical difference: the American WEA is a cell broadcast (broadcast to the tower) with a distinctive loud signal that will sound even when silenced; the Polish Alert RCB is an SMS delivered by operators. WEA also has categories and settings on the phone, while Alert RCB comes like a regular message from the sender 'ALERT RCB'. More about the Polish system in a separate guide.

Fact-Check Summary

Definitely true: verified in federal sources (FCC, FEMA/IPAWS, weather.gov, ready.gov, eCFR 47 CFR Part 11): WEA is a cell broadcast (not SMS), anonymous, without an app and number, resistant to network congestion; distinctive signal + vibration repeated twice; length up to 360 characters on LTE+; precise geo-targeting (~160 m); categories and opt-out – National Alerts (formerly Presidential) are non-removable, Imminent Threat / AMBER / Public Safety are removable, tests are default off; national and imminent threat alerts sound despite silencing and Do Not Disturb mode; EAS on radio/TV with tones 853+960 Hz, activated by NWS among others, and national level only by the President; IPAWS as FEMA's master system; NOAA Weather Radio on 162.400–162.550 MHz, 'all hazards', requires a receiver; last national test on 10.4.2023, no test in 2024 and 2025; ready.gov kit (gallon of water per person per day, food for 3 days, NOAA radio, flashlight, first aid kit, documents, cash, medications, power bank); local reverse-911 systems are voluntary and separate from WEA; no 'alarm cancellation signal' – end of threat from NWS/agency messages.

Requires confirmation from the source / variable: exact date of the national test in 2026 – legally due by October 2026, but as of July 2026, FEMA/FCC have not announced an official date (check fema.gov, fcc.gov); full implementation of multilingual WEA alerts (several languages + ASL) – rule adopted in 2025, implemented in phases over ~30 months, by mid-2026 still incomplete; exact paths in phone settings vary between manufacturers and system versions.

Sources