Alerts, Notifications, and Warnings

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Denver's Emergency Alerting Systems

Denver has two ways of directly notifying residents and visitors about emergencies as they happen and what actions people should take to remain safe. Our Reverse Emergency Notifications require people to sign up while our Wireless Emergency Alerts do not. Click on the tabs to learn more about each alert and how you can ensure you're able to receive vital information during emergencies and disasters. 

Reverse Emergency Notifications (REN)

Reverse Emergency Notifications (REN) 

Denver's Reverse Emergency Notifications (REN alerts) send an alert to the public via voice call, text message or email when there is police activity in their designated areas. The alerts provide direction and information on how the public can remain safe during an incident. Residents can sign up to receive alerts by providing your contact and location information, while also requesting alerts for multiple locations. If you move, you can update your location and contact information using the the alert management dashboard. You can also can opt out of the notifications by pressing '0' during a voice call or replying “STOP”, via text message. 

Sign Up to Receive Reverse Emergency Notifications



Wireless Emergency Alerts (WEA)

Wireless Emergency Alerts (WEA) 

Denver has used Wireless Emergency Alerts to keep the community informed since 2013. When there is an emergency relevant to your location, you will receive an alert on your phone, similar to an Amber Alert with guidance on what to do to remain safe. You do not need to sign up to receive these alerts, however, you can click here(PDF, 216KB) to ensure your alerts are ON and WORKING. 







Additional Information about Denver's Alerting Capabilities

Denver has has the ability to notify residents and visitors of emergencies as they happen while also providing guidance on how people can remain safe through an incident. Click the tabs to learn more about our alerting capabilities. 

Tornado Sirens

The City and County of Denver’s Outdoor Warning Siren System was installed between 2012 and 2014. There are 86 sirens citywide: 75 in the city and 11 at Denver International Airport (DEN). The sirens are primarily used for tornado warnings, but can be used for any emergency where the public needs to seek shelter quickly. The sirens are tested on the second Wednesday of every month at 11:00 am.

What to do when the sirens sound

During a real emergency, the sirens will sound for 3 minutes at a time. Depending on how long the warning period lasts, the sirens may be resounded multiple times throughout the warning period.

When you hear Outdoor Warning Siren System, you should:

  • Seek shelter indoors, preferably in a stairwell, basement, or the lowest building level. If there is no basement, go to the center of an interior room on the lowest level (closet, interior hallway) away from windows, doors, and outside walls. Put as many walls as possible between you and the outside. Do not open windows.
  • Once you are inside a secure location, tune to local media (TV, radio, mobile device, etc.) or NOAA weather alert radio to be informed of the storm location, path and the duration of the warning.
  • There is no “All Clear” sound that the sirens make, nor does the National Weather Service (NWS) issue an all clear message. Once the warning period has expired or is cancelled, it is safe to leave your shelter location. Be aware, however, that the NWS may extend the warning or issue a new warning at any time, so remain vigilant.
  • The NWS is the only official source of severe weather warnings/watches, including tornados. All tornado warnings are initiated by the NWS. However, the City and County of Denver may sound the sirens without a NWS issued warning if a tornado has been sighted by trained observers.




Emergency Alert System (EAS Alerts)

The Emergency Alert System (EAS) is a national public warning system that requires radio and TV broadcasters, cable TV, wireless cable systems, satellite and wireline operators to provide the local and federal authorities with capability to address the American people within 10 minutes during an emergency.

  • Messages can interrupt radio and television to broadcast emergency alert information.
  • Messages cover a large geographic footprint. Emergency message audio/text may be repeated twice, but EAS activation interrupts programming only once, then regular programming continues.
  • Messages can support full message text for screen crawl/display, audio attachments in mp3 format, and additional languages.

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