Note: A steady tone may change in volume as the siren rotates to and away from the listener as the sirens are mounted on rotating platforms.
- If you hear a steady tone that lasts for three to five minutes, this tone is the attention or alert warning signal. This tone is only used in three instances.
- A confirmed sighting of a tornado or funnel cloud aloft, reported by a trained weather spotter, within five miles of any point within the Village of Hanover Park
- A confirmed sighting, by a trained weather spotter, of severe winds causing structural damage within five miles of any point within the Village of Hanover Park
- The receipt of a tornado warning, issued by the National Weather Service, indicating that the Village of Hanover Park is in the direct path of an oncoming tornado.
In the event of activation of either of these warning signals, residents should move to a place of safety and monitor radio and television stations for additional information including the danger has passed. Please note that there is no siren activation to indicate the danger has passed.