Warning Sirens

 

The Outdoor Warning Siren System (OWSS) is an outdoor, all-hazards siren system that is used to warn the general population of potential danger in a short amount of time. The system is designed to provide coverage to persons out of doors, not inside buildings or structures.

• Outdoor Warning Siren Activation Policy
• Outdoor Warning Siren Frequently Asked Questions
• Letter from the Director Regarding the Siren Policy, June 2010
• Justification for the current outdoor warning policy - August 2018
• Map of Outdoor Warning Sirens

What Do the Sirens Mean?

• The OWSS will be activated upon receipt of a tornado warning issued by the National Weather Service (NWS) for Polk County.
• Severe Thunderstorm Warnings where forecasted or actual wind speeds reach or exceed 70mph (61kts)
• Sirens will sound in a cycle of 3-5 minutes, followed by a 10-15 minute break for the duration of the threat (warning period).

Siren Test

Please note that cities do perform a monthly siren test to ensure all sirens are functioning. The entire system is tested at noon on the first Saturday of each month unless severe weather is imminent.

What Should I Do if I Hear the Sirens?

If the sirens are activated – and it is not a monthly test – the public should see it as a signal to:

• Seek shelter
• Tune into radio or television to get information about:
  • Type of Emergency
  • Instructions & Recommendations

The public should not call 9-1-1 unless they have an actual emergency.