Overview
- The nationwide test, which will run on Thursday, September 10, will send a test warning at 11:00 and an Entwarnung at about 11:45 via connected warning multipliers and Cell Broadcast.
- Authorities will use multiple channels including radio and television breaks, the NINA and KATWARN apps, digital displays, loudspeaker vehicles, and local sirens where municipalities choose to participate.
- Cell Broadcast will deliver messages directly to switched‑on, compatible phones without an app, but a device must be powered on, out of flight mode and in network range to receive the alert.
- Local participation varies by community: Stuttgart has no stationary sirens and will stay silent, while many Bavarian towns will sound one‑minute sirens at both the warning and the Entwarnung.
- Officials say the drill aims to expose technical gaps and teach people how official alerts look and what to do, noting tests can distress vulnerable people and pets and that municipalities list local plans on their websites.