The park district’s lightning warning system will be on April thru October. The system warns park users if lightning is in the area. The system is operational at Kasey Meadow, Krueger and Martin Parks. If you hear a horn blast, this is your warning to take cover immediately. Play should be suspended until the all-clear signal is heard: The all-clear signal will be three short 5-second blasts. This system is mechanical and may malfunction. Always use common sense, if you hear thunder or see lightning do not wait for the system to activate. Take cover immediately! When planning outdoor activities it is advisable to check the weather forecast. Your cooperation is appreciated.