You can find the latest about COVID-19/Coronavirus here.

In an effort to plan for tornado events, the City has sixteen outdoor warning sirens placed strategically throughout the City to warn the public. The outdoor warning sirens are tested on the first Tuesday of each month at 10:00 AM for a one minute duration.

Common Outdoor Warning Siren Questions


  • What can I do to be notified of an impending tornado inside my home or business?
  • What should I do if I hear an outdoor warning siren?
  • Will the sirens provide an "All Clear" signal?
More »

Crystal Lake Siren Locations

The sirens are strategically located to provide the optimal coverage area for all City residents. 

Crystal Lake Siren System Coverage Map