Overview
- Coordinated warning drills are set for Thursday, March 12, with Hessen starting around 10:00 and many NRW locations at 11:00 using sirens, warning apps and Cell Broadcast.
- For the first time, an all‑clear will be delivered via Cell Broadcast after the test warning (about 10:30 in Hessen and about 11:20 in NRW), which may appear with a soft sound or no tone depending on phone settings.
- NRW’s siren sequence will run in three phases—11:00 continuous tone, 11:06 rising‑falling tone, 11:12 continuous tone—with loudspeaker vehicles planned where coverage is limited.
- Alerts will be pushed through the MoWaS system to apps including NINA, KATWARN and BIWAPP, which can result in duplicate push notifications for users.
- Officials emphasize the drill poses no danger, ask residents not to call 112 or 110 with inquiries, and highlight self‑protection guidance to improve household readiness.