Tornado Warning Sirens

What is a Tornado Outdoor Warning Siren?

  • A Tornado Siren warns people outdoors who cannot hear warnings through broadcasts that a tornado warning has been issued. The sirens are not meant to warn people indoors, although you may hear the siren inside if you live in its proximity.  

Who decides to sound the sirens and when will I hear them?

  • Sirens are sounded immediately when the National Weather Service issues a tornado warning in or around the Oakbrook Terrace Area and are in effect until the threat has passed. The siren is sounded from the City Hall on Butterfield Road.
  • The outdoor warning system will be tested monthly on the first Tuesday of each month between 10:00-10:30 a.m. These monthly tests last approximately three (3) minutes.

What should I do when I hear the siren?

  • Take immediate cover when you hear a siren. Go indoors to a safe room at ground level or below. Avoid windows. Basements are typically the best option. If there is no basement, go to a center hallway, bathroom or closet on the lowest floor.
  • If you are outside, seek shelter in a sturdy building. If not, lie flat and face-down on the low ground, or in a ditch protecting the back of your head with your arms. Get far away from trees and cars. Vehicles are extremely dangerous in a tornado. If caught driving, park the car as quickly and safely as possible-out of the traffic lanes. Never try to out drive a tornado. Get out and seek shelter in a sturdy building. If in the open country, run to low ground away from any cars. Avoid seeking shelter under bridges, which can create deadly traffic hazards while offering little protection against flying debris. Stay in a safe place until the weather improves.

DO NOT CALL 9-1-1 unless it is an emergency.

*A Tornado Warning is issued by the National Weather Service. It is issued when:

  • a tornado is reported on the ground
  • a funnel cloud is reported in the sky
  • a thunderstorm with strong rotation is indicated by radar

This is very different from a Tornado Watch, which means that conditions are favorable for the development of tornados, but no tornado has been spotted. If storms approach, stay tuned to the radio or television for updates.

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