The River Forest Park District's Lightning Prediction system is in place at Keystone, Centennial (Library), Constitution (north of Willard School) and Priory Parks. The system has been provided for your safety; please understand how the system works and what to do when an alert is sounded. When lightning is imminent, a single 15-second horn blast will alert of the impending danger, as will a flashing strobe light at each location. When this occurs, parks and facilities are deemed closed, and all activities should cease immediately. Park patrons should then seek safe shelter in a building or automobile. When the danger of an imminent strike has passed, you may return to outdoor activities upon hearing three short 5-second blasts, the "all clear" signal. The strobe light is a second indicator of "all-clear", only if it is not flashing. If the strobe light remains on, the danger of lightning is still a possibility, and facilities will remain closed. As a second reminder, fields and facilities of the Park District are deemed closed when the Lightning Prediction System is activated. All activities are to be stopped immediately upon the sound of the horns or the flashing of the strobe lights, as the danger of a lightning strike may be imminent. Your cooperation is critical to the success of this unique program, as well as the safety of you, your team members, and the many families and friends of our sporting community. The Lightning Prediction System will be on duty April through November each year, from 8:00 a.m. until 10:00 p.m. Common sense needs to be used when dangerous weather conditions are approaching or exist. Don't wait for the Prediction System to sound before you vacate a facility. If severe weather is approaching, or if you hear thunder or see lightning, please seek safe shelter immediately.

Lightning Quick Tips

  • Warning Horn will sound (15 second blast) when a potentially dangerous weather situation is approaching
  • Clear the field immediately & seek proper shelter (building or automobile)
  • Wait for all clear (3 short horn blasts)
  • System operates 7 days per week, 8am to 10pm
  • Signal horns may not be at your site, but at a site within earshot. If you hear the alarm, clear the field
  • If weather is threatening and no alarm is heard, clear the field
  • Lead by example. Clear the field when necessary and prudent
  • Call the Park District at (708) 366-6660 for more information
  • Thank you for supporting this community-wide safety program!