Lightning Warning System
Naperville Park District uses a lightning warning system in many parks. The signal is activated by threatening weather. You will hear one long warning signal and see a flashing light on top of devices. When the signal activates, all activities must be suspended and patrons must seek shelter immediately. Once the threat of lightning has passed, you will hear three short bursts from the siren. This indicates that activities can resume. This system is not fail-proof. Take shelter immediately when lightning threatens even if a signal has not sounded.