As others in this thread have noted, sirens are tested (at least) once a year locally. What makes this special is that it is a centralized test for the whole co

As others in this thread have noted, sirens are tested (at least) once a year locally. What makes this special is that it is a centralized test for the whole country with other channels being tested as well (TV, Radio, mobile app). Where I live, it was rather underwhelming. I probably would not have noticed if I hadn't known about it before which may be a bad sign, to be honest.