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Sirens are an outdoor warning system designed only to alert those who are outside that something dangerous is approaching.
When the sirens are heard, go inside and tune to local media to get more information.
No, the warning siren will not be sounded when the threat has passed.
There is not an all-clear signal because people should be indoors and monitoring local media for updates on the storm.
When thunderstorm winds exceed 70 miles per hour (mph), trees can be uprooted or snapped. Hail that is golf ball sized or larger can break windows. Both of these things pose a direct risk to life if people are caught outdoors.
For alerts indoors, every home and business should have a National Oceanic and Atmospheric Administration (NOAA) Weather Radio All-Hazards. NOAA Weather Radio is like a smoke detector for severe weather, and it can wake you up when a warning is issued for your area so you can take appropriate action.