Storm Warning System

Tornado HeaderTornado Sirens

Like all outdoor warning sirens, our sirens are meant to be heard by people that may be outdoors and unsheltered. The sirens are not designed to be heard by people that are indoors and therefore sheltered.

In the event that you hear an outdoor warning siren activate, you should seek shelter immediately. The best shelter would be in the basement of a building away from windows or other openings. You should turn on your radio or television to obtain additional information and instructions.

The outdoor warning sirens are tested monthly, weather permitting, on the first Monday of the month at 11:00 AM.  There will be a one-minute tone followed by a voice announcement. Because the outdoor warning sirens are designed to be heard outside, we also recommend the use of weather alert radios in homes and businesses.

To report a siren that does not sound during the monthly test or to report an unscheduled siren activation please call the ECC Customer Service Line at 314 615-9551 or send a detailed email to including your name, address and phone number.

To view outdoor warning sirens locations click here.

What should I do when I hear the sirens?
When you hear tornado sirens, go inside and tune to local media to get more information.
Why can’t I hear the sirens in my house?
Sirens are an outdoor warning system designed only to alert those who are outside that something dangerous is approaching.
How can I get alerts when I’m at work or in my house?
For alerts indoors, every home and business should have a NOAA Weather Radio All-Hazards. NOAA Weather Radio is like a smoke detector for severe weather, and it can wake you up when a warning is issued for your area so you can take appropriate action.
When are sirens tested?
Sirens are tested according to local community policies.
Why don’t the outdoor warning sirens sound an all-clear signal?
People should be indoors and monitoring local media for updates on the storm.
Will the sirens warn me of every dangerous storm?
The safest approach is to be proactive and use all of the information available to protect yourself and your family from threatening weather. Nothing can replace common sense. If a storm is approaching, the lightning alone is a threat. Sirens are only one part of a warning system that includes preparation, NOAA Weather Radio, and local media.
Who activates the sirens?
Sirens are typically activated by city or county officials, usually a police or fire department or emergency management personnel. Check with your city or county officials to learn more.

To learn more about county emergency management operations, please visit St. Louis County Government Emergency Management.