When Is It Safe to Come Out of Your Tornado Shelter?

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As I have mentioned before, I am working with Survive-A-Storm storm shelters. 
One of Survive-A-Storm's commercial shelters
During the recent Andover Tornado, there were people lislead by the sirens being turned off. They thought it meant the threat was over and came out of their safe area. Here's the scoop: Jurisdictions do not run sirens continuously for fear of burning them out. 

The ceasing of sirens (due to being turned off, loss of power, being struck by the tornado) tells you nothing about whether it is safe to leave the shelter. I have a blog piece here, ironically written the day before Andover, that explains how to know when it is safe to come out of shelter. 

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