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The original item was published from 4/2/2020 2:47:09 PM to 5/1/2020 12:00:02 AM.

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Posted on: April 2, 2020

[ARCHIVED] Outdoor warning siren testing set to begin on April 6

032619 Outdoor Warning Siren Mark Twin Outlook (JPG)

MUSCATINE, Iowa – The Muscatine County Joint Communications Center (MUSCOM) will start the yearly testing of the Outdoor Sirens on Monday, April 6, 2020.  The sirens are tested at 11 a.m. on the first Monday of every month during non-freezing months. However, if there is severe weather forecast for a testing day, the sirens will not be tested.


Just as a reminder to all citizens, during a severe weather event the sirens are activated by MUSCOM when the following criteria is met:

  • Tornado Warning issued by the National Weather Service (NWS)
  • Tornado or funnel cloud reported by a trained weather spotter
  • Severe Thunderstorm Warning issued by the NWS or a report from a trained weather spotter that includes:
  • Wind 70 mph or greater and/or
  • Golf ball sized hail or larger

According to information from the NWS most fatalities during tornadoes or severe thunderstorms occur due to falling trees or large branches.  The typical threshold at which large branches and small trees break is a 70 mph wind.  Hail also begins to break windows when it reaches or exceeds golf ball sized.

“The sirens are activated based on data and watches/warnings that MUSCOM receives from the National Weather Service,” Chris Jasper, 911 Communications Manager for MUSCOM, said.  “The dispatchers watch for certain data and warnings to be put out from the National Weather Service and if the set criteria are met, then the sirens are activated.” 

Sirens are designed to alert citizens who are outdoors of an imminent hazard and prompt them to go indoors and seek further information.

“We encourage the public to tune into local media outlets or listen to a weather radio during severe weather and ask that they limit the use of 911 to emergencies only,” Jasper said.

There is no “all clear” from the sirens as citizens should be indoors and monitoring for additional information.

“All weather watches and warnings that are issued by the National Weather Service have an expiration date and time and when the warning or watch expires then it considered all clear,” Jasper said. 

Anyone that believes a siren is not working or malfunctioning can reach out to the County Emergency Manager at 563-288-3909.

Press Release (PDF)
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