What do the sirens mean?
  • The OWSS will be activated upon receipt of a tornado warning issued by the National Weather Service (NWS) in 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).

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

Show All Answers

1. What do the sirens mean?
2. What Should I Do if I Hear the Sirens?
3. Why can’t I hear the outdoor warning sirens in my house?
4. What is the difference between a watch and warning?
5. What to do during flooding