When are the city tornado sirens tested?

Sioux County has several outdoor warning sirens.  Sirens are located in the towns of Alton, Boyden, Chatsworth, Granville, Hawarden, Hospers, Hull, Ireton, Matlock, Maurice, Orange City, Rock Valley, and Sioux Center.  All sirens are activated by the Sioux County Communications Center to ensure the radio equipment and the sirens are operating properly and will sound in an emergency.   All sirens are tested during the first Friday of the month for the months of April through September at 9:30 AM unless the following conditions are met:

  • Sioux County is included a Severe Thunderstorm or Tornado Watch OR Warning
  • Thunderstorms are within a 50-mile radius of Sioux County.

The Emergency Management Coordinator can aid in the decision on whether to cancel the test. In the event the Coordinator is unavailable, the dispatcher should consult with the Sheriff. If neither is available, the dispatcher performing the test should feel free to use their best judgment.

Sioux County Warning Sirens will be activated during:

  1. Tornado Warnings
  2. If an accredited weather spotter requests Sioux County to sound the sirens for a specific community related to a threat they are monitoring.
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