Tornado Fact Sheet

Frequently Asked Questions

A funnel cloud is just what the name implies; it's a funnel- or wedge-shaped cloud that does not touch the ground. When it touches the ground, it's a tornado.

A tornado watch is when weather conditions are ripe to produce tornadic activity.

A tornado warning is when a tornado has been sighted and confirmed by trained and qualified personnel in the warning area, or when the National Weather Service confirms a radar signature of rotation.

Yes, the Village monitors weather 24/7. When severe weather is forecasted to occur, the Village activates its Emergency Operations Center, which is staffed by severe weather professionals who are in contact via radio, phone and computer with the National Weather Service's Cook and Will County agencies. The Village also deploys select individuals throughout the community to monitor and report severe weather conditions.

Sirens are activated to advise all who hear it to take cover for at least 20 minutes. Should the danger exist for tornado conditions, the warning siren will again be activated. There is no all-clear signal. Should you hear the siren again, seek shelter immediately. Sirens are meant for outdoor use and may not be heard indoors. If possible, monitor the radio or other media for news updates.

There are 13 outdoor warning sirens within the Village of Tinley Park. They are meant for outdoor use and not always heard when indoors.

The decision to activate the outdoor sirens will be based upon the following situations:

  • A funnel cloud or tornado has been sighted by or has been confirmed by trained public safety personnel within the Village of Tinley Park
  • National Weather service alert of a tornado radar echo that is in the confirmed path of Tinley Park with designated time
  • A report of tornado or funnel cloud that has been received by neighboring public safety agencies
  • Straight line winds in excess of 60 mph

Yes. Staff from the Tinley Park Emergency Management Agency along with Police, Fire, and Public Works personnel are trained and qualified by the National Weather Service.

Yes. Sign up for weather alerts using the Everbridge community notification system.