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Tornado Siren FAQ and Update

picture of weather warning sirens
February 9, 2021

Why didn’t I hear a tornado siren last night?

Cobb County has 74 tornado sirens spread across the county.  Smyrna also has some that operate in their jurisdiction.  

The sirens are computer-controlled to alert if they are in, or within 2 miles of, a National Weather Service warning polygram.  For example, the Tornado Warning issued last night was primarily for the north part of the county, sirens south of that line would not have alerted.

Because of growth in Cobb, its topography, and trees, we highly recommend that you do not solely rely on these sirens for critical weather alerts.  There are a number of situations, including weather conditions and how sound-proof your home is, where you may not be able to hear these sirens clearly.  

There are a host of weather-alerting apps for your phone, weather radios, and other methods to get timely weather alerts no matter where you live in Cobb County.  For more information, please visit


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Ross Cavitt | Cobb County Communications Director | Email | Contact Us | Webpage