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Storm Warning Sirens
Johnson County Siren Guidelines
The storm warning sirens are an outdoor warning system, designed to alert those who are outside that something dangerous is approaching. 

Under the Johnson County outdoor warning system guidelines, sirens are sounded for:
  • Tornadoes: Tornado warnings, either Doppler radar-indicated or reported by a trained spotter.
  • Wind: Severe thunderstorm warnings with winds of 70 mph or greater (potential for whole trees to snap or uproot).
  • Hail: 1.75 inch (golf ball-sized) or larger (potential for windows to break)

What to Do When a Siren Sounds
The storm warning is a high-pitched, constant tone that lasts for three minutes. Sirens may be sounded multiple times to convey a continued or new threat.  If sirens sound:
  • Seek immediate shelter indoors.
  • In the threat of a tornado, seek indoor shelter in a basement.
  • Stay away from windows.
  • Respond to the storm warnings provided by the National Weather Service

Siren Testing
Sirens are tested on the first Wednesday of each month starting at 10:00 am and are operated by the Johnson County Joint Emergency Communications Center.

Siren Locations
Outdoor storm warning sirens are located throughout Coralville (north and south of Interstate 80) to provide notification of severe weather.
  • Kiddie Korral Park (Intersection of 12th Avenue and 8th Street)
  • Coral Ridge Avenue (Highway 965) and Holiday Road (northeast corner)
  • Forevergreen Road and Highway 965 (shared with North Liberty)
  • 2000 James Street
  • 1st Avenue at Brown Deer Golf Club entrance
  • 2351 Old Hospital Road (Oakdale Campus)

Most of Coralville’s storm warning sirens operate on solar charged batteries which allow the system to remain functional in the event of a power failure.  If you live near a siren and think it is malfunctioning, please contact Fire Chief David Stannard at 319.248.1835.


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