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Outdoor Warning Sirens

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Outdoor warning sirens are operated by Hennepin County Emergency Management. Sirens are used for severe weather warnings, as well as for other situations when people should take shelter.

If you hear a siren, seek shelter and turn on a radio or TV to hear safety information. If severe weather is in your area, don't wait for the sirens to go off before seeking shelter. In some fast-moving storms, the danger may pass through before the siren can be turned on.

To be prepared in the event of an emergency such as a tornado or severe thunderstorm, the sheriff’s communication division tests/activates all sirens in Plymouth at 1 p.m.

There are two different signals that warn you of possible threats to your community.

  • The first, and most used signal, is for tornadoes and other severe weather. This signal is a steady pitched sound.
  • The second siren sound is for other types of emergencies. It is a warbling sound.

If you have questions or concerns about siren operation or coverage, please visit the Hennepin County Emergency Management webpage or contact Hennepin County Emergency Management by emailing or calling 612-596-0250.