Own a cellphone? You might want to be holding it away from your ear today (Nov. 20) at exactly 12:55 p.m.
That's when a test of Alert Ready, Canada's National Public Alerting System, will take place in Ontario.
The test will simulate an emergency alert, beginning with the alert tone, known as the "Canadian Alert Attention Signal," according to a news release.
The message will indicate that it is a test and does not require action from the public.
The alert will be distributed on TV, radio and wireless.
The Canadian Radio-television and Telecommunications Commission requires wireless providers and broadcasters to send at least one test alert per year, either in May during Emergency Preparedness Week and/or in November.