Outdoor Warning Sirens

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In an effort to plan for tornado events, the City has sixteen (16) outdoor warning sirens placed strategically throughout the City to warn the public who are outdoors. 

The outdoor warning sirens are tested on the first Tuesday of each month at 10:00 a.m. for a one minute duration. The sirens produce a loud steady tone during the monthly test as well as during an actual tornado warning.

What should I do if I hear an outdoor warning siren?
If you hear an outdoor warning siren, seek shelter inside immediately. Once inside, turn on a television or radio to learn further information. Local officials will disseminate information about the emergency through these outlets.

Please do NOT call 911 when you hear the siren. Please use your television or radio to get these updates.

What can I do to be notified of an impending tornado inside my home or business?
Equip your home or business with a NOAA Weather Radio. This valuable tool can provide you with detailed weather information. Click here for more information regarding NOAA Weather Radios.

When are outdoor warning sirens activated?
The outdoor warning sirens are activated when a public safety officer (police, fire or EMS) or trained spotter reports sighting a funnel cloud or tornado in our area.  The sirens are also activated when the National Weather Service issues a tornado warning for southeast McHenry County when the area is in the track of the storm.

What is the difference between a Watch and a Warning?
A Severe Thunderstorm Watch means severe weather is possible. A Severe Thunderstorm Warning means that severe weather is in the immediate area.

A Tornado Watch means that conditions are present that could produce a tornado. A Tornado Warning means that a tornado has been sighted, and that you should prepare to seek shelter. The sirens will only be activated for a tornado warning or if a trained spotter reports a funnel cloud or an actual tornado.

Will the sirens provide an "All Clear" signal?
No. Any "ALL CLEAR" information is provided by the local news media. The sirens will NOT be activated to indicate an "ALL CLEAR".

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

Crystal Lake Siren System Coverage Map, Rev 6-2016

What can I do to prepare for emergencies?
The Police and Fire Rescue personnel of the City of Crystal Lake have compiled an Emergency Preparedness Guide to help Crystal Lake residents prepare for natural and/or man-made disasters. Click here Emergency Preparedness Guide.

Where can I get more information?



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