Severe Weather and Outdoor Warning Sirens. DUPAGE COUNTY OUTDOOR WARNING SIRENS. Emergency Siren Sound Siren Activation Siren Testing. EMERGENCY SIREN SOUND. 3 – 5 minute steady tone It’s one tool used to warn of severe weather You might not hear them if indoors.
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Severe Weather and Outdoor Warning Sirens
Conditions are favorable for severe thunderstorms.
Indicates an immediate danger to those in the path of the storm.
If you see any of these -Take shelter!