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Will there still be a tornado siren test today, despite Tuesday storms? What to know
Sirens will sound for a three-minute duration in 10-minute intervals ‒ three minutes on, seven minutes off – for as long as the warning is in effect. There is no "all-clear" siren to signal ...
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Primary History KS2: WW2 Clips. An air-raid siren sounds the ‘all clear’
The sound of the 'warning' signal and the 'all clear' would become very familiar to people living in large cities in Britain. Air raid sirens were placed on the top of tall buildings - often ...