Emergency Public Warning System

The Emergency Public Warning System was a system used in the province of Alberta, Canada until June 28, 2011, whereby local or provincial authorities could warn the public about impending or current emergencies affecting their area. The system was proposed by the provincial government after an F4 tornado ripped through Edmonton, Alberta on July 31, 1987, killing 27 people and causing millions of dollars in damage.

Source: Wikipedia — Emergency Public Warning System (CC BY-SA 4.0)