When Do Tornado Sirens Go off?

Answer

Tornado sirens go off most commonly when there is a weather threat such as a tornado or other severe weather. However, they also go off for practice on the first Wednesday of every month.
Q&A Related to "When Do Tornado Sirens Go off?"
They are Early Warning sirens for the purpose of informing the public as early as possible about the possibility of dangerous weather conditions in your area.
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The sirens are connected to a sensor that sounds the alarm when there is a rapid change in atmospheric pressure. If a cold front came in quickly and the pressure changed rapidly then
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