Outdoor Warning Sirens

Outdoor warning sirens are designed to alert people who are outdoors that a dangerous situation is occurring or imminent. Hearing a siren should be your signal to move to safe shelter immediately and obtain additional information regarding the threat.

Outdoor warning sirens may be activated when there is an immediate threat to people outdoors, including:

• Tornado warnings issued by the National Weather Service
• Reports of an observed tornado that may impact the City of Grand Rapids
• Destructive thunderstorms
• Other fast-moving hazards that pose an immediate danger to public safety (hazardous materials releases, active assailants etc.)

No. While outdoor warning sirens may be activated for tornado warnings, they may also be used for destructive thunderstorms or other immediate hazards that pose a threat to people outdoors. When you hear a siren, seek shelter immediately and obtain additional information about the specific threat.

Outdoor warning sirens are activated based on the location of a potential hazard. Depending on the nature and location of the threat, some sirens may sound while others do not.

The City uses geofencing technology to help target notifications to areas that may be at risk. This allows the siren system to focus warnings on impacted areas rather than activating every siren citywide during every event.

Outdoor warning sirens are intended to alert people who are outdoors and should not be relied upon as an indoor notification system. Several factors may affect whether you hear a siren, including:

• Being indoors
• Distance from the nearest siren
• Wind direction and weather conditions
• Building construction
• Traffic or other environmental noise

For this reason, residents should always have multiple ways to receive emergency alerts and warning information.

Find shelter indoors immediately and seek out additional information on the threat.

If possible, go to a basement. If a basement is not available, move to a small interior room on the lowest level of the building, such as a bathroom, closet, or hallway. Stay away from windows and doors.

Once safely inside, monitor trusted information sources for additional information about the threat, including:

• Weather apps
• National Weather Service alerts
• Local television and radio stations
• City of Grand Rapids social media channels (@readygrandrapids)
• Grand Rapids Office of Emergency Management social media channels

Continue monitoring conditions until officials indicate the threat has passed.

 If you are in a vehicle, seek shelter in a sturdy building as quickly as possible.

If no building is available, try to remain in your vehicle if possible. You are likely safer in your vehicle than outside.

Do not seek shelter beneath a highway overpass.

Seek a sturdy building immediately if one is available.

If no shelter is available, lie flat in a nearby ditch or low-lying area and protect your head and neck.

Outdoor warning sirens produce a steady, high-pitched tone that can be heard outdoors. Both monthly tests and emergency activations sound for approximately three minutes.

Listen to a recording of one of our outdoor sirens (MP3, 158KB)

The City of Grand Rapids operates and maintains 27 outdoor warning sirens throughout the city. Siren activations are managed by the Grand Rapids Emergency Communications Center (ECC).

The City of Grand Rapids operates its own outdoor warning siren system, separate from the system used by surrounding Kent County. The system includes built-in redundancy that allows Grand Rapids and Kent County emergency communications personnel to activate one another's sirens during emergencies or equipment failures, helping ensure reliable operation.

Multiple transmitters support the City's system, helping maintain dependable coverage and increasing reliability during severe weather.

The City operates 27 outdoor warning sirens strategically located throughout Grand Rapids.

If you observe a damaged siren or have concerns about a siren's condition, please report it by calling 311.

Outdoor warning sirens are tested at noon on the first Friday of every month, year-round.

The City's monthly testing schedule changed following the 2026 siren system upgrade. Tests were previously conducted only from April through October. Monthly testing helps ensure the outdoor warning siren system is operating properly and allows emergency personnel to identify potential maintenance issues before a real emergency occurs.

If severe weather is occurring or expected, the monthly test may be postponed.

No. Grand Rapids outdoor warning sirens do not provide an "all clear" signal.

Continue monitoring trusted information sources until emergency officials or the National Weather Service indicate that the threat has ended.

If you observe damage to an outdoor warning siren, hear a siren sounding unexpectedly, or notice another potential issue with a siren, please report it by calling 311.

When reporting an issue, please provide as much information as possible, including:

• The location of the siren, if known
• The date and time the issue occurred
• A description of the problem observed

Resident reports help the City identify and address potential issues with the outdoor warning siren system.