How does the National Weather Alert Day work?
At around 11:00 a.m., the Federal Office for Civil Protection and Disaster Assistance (BBK) will issue a test alert via the so-called Modular Warning System (MoWas). This system is linked to alert apps such as NINA and KATWARN, as well as the Cell Broadcast mobile service. In addition, state and local authorities will also activate their local alert channels, which include sirens, for example. The all-clear will then be issued around 11:45 a.m.
Did you know? The siren signals for warnings and all-clear announcements sound different. You can listen to both siren tones at the link below and then pay attention to them on National Siren Day: Siren Signals to Listen To.