Severe Weather

The National Weather Service tests all outdoor warning sirens on the first Tuesday of each month at 10:00 a.m. for a duration of about 1 minute. DuComm Dispatch is responsible for sounding our sirens for both the testing and real-world activation. 
Activation: If the Village of Hanover Park is threatened by a tornado, the sirens will be activated for a duration of about 3 minutes. The location, design and performance of the siren system is intended to provide a warning to people outdoors, to take cover. The sirens are not designed to provide warning to building occupants. 

Because of the unpredictability and sudden appearance of tornadoes, it may not be possible to provide advance warning; however, if you hear the warning siren, immediately seek shelter and tune in to a local radio or television station. 

Any "ALL CLEAR" information is provided by the local news media. The sirens will NOT be activated to indicate an "ALL CLEAR".

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Our outdoor warning sirens can be used to alert for all hazards but most people know them for tornado warnings. Sirens have two settings and it is important to learn the distinction between the two tones.

Alert: A single tone signifying an emergency alert. This signal may be used for an emergency or disaster, including a severe storm, tornado warning (not a tornado watch), earthquake, chemical hazard/hazardous material incident, extreme winds, or biological hazard.   

Attack: An up-and-down, rising and falling tone to signify there is a homeland security or attack emergency. This signal would be used if community officials were notified by federal and/or state government officials of an actual or impending attack on the local community.  

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The Village of Hanover Park is a Storm Ready certified municipality by the National Weather Service. For additional Severe Weather information for our area, please see

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We often associate Severe Weather Hazards with tornados but sometimes, we are more impacted by associated hazards like hail, lightning, wind damage and flooding. It’s important to be aware of severe weather watches, warnings and the associated impacts to protect yourself, your family, and your homes.

WHAT is THE difference between a Watch and a warning?

Watch: Be Alert and tune into a weather alerting system including tv, social media, radar or your NOAA weather radio. This means severe storms or tornadoes MAY form and affect your area.

Warning: Take Action! A severe storm or tornado is expected in your area!