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Educational guide, not an alert service: no live data. Always follow official instructions from JMA, your municipality, police, fire and staff. In an emergency, protect yourself first. Full disclaimer

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Japan alert decoder · ミサイル発射情報（Jアラート）

Missile launch (J-ALERT)

Act now: protect yourself · official rules as of 2026-10-17

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Act now: protect yourself

ミサイル発射情報（Jアラート）

Missile launch (J-ALERT)

A ballistic missile may fly over or land in Japan. It can arrive in under 10 minutes. Follow-up messages say whether it passed over or landed.

What to do now

  1. Outdoors: go into a nearby sturdy building or underground (subway station, underground mall) right away.
  2. No building nearby: take cover behind something, or lie flat on the ground and protect your head.
  3. Indoors: move away from windows or into a room without windows.

If something lands nearby: cover your mouth and nose, move away and upwind, and seal yourself in a building (close windows, turn off ventilation).

Issued by: Government of Japan via J-ALERT (Cabinet Secretariat), with sirens and phone emergency alerts. Live status: JMA warnings map (English)JMA earthquake information (English)JMA tsunami information (English)

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Educational guide, not an alert service: no live data. Always follow official instructions from JMA, your municipality, police, fire and staff. In an emergency, protect yourself first.

Data as of 2026-10-17 from official JMA, Cabinet Office, Cabinet Secretariat (J-ALERT) and Ministry of the Environment pages, with official names from the JMA multilingual dictionary (2026-03-26). Not affiliated with JMA or any government agency.

Educational guide, not an alert service: no live data. Always follow official instructions from JMA, your municipality, police, fire and staff. In an emergency, protect yourself first. Data as of 2026-10-17 from official JMA, Cabinet Office, Cabinet Secretariat (J-ALERT) and Ministry of the Environment pages, with official names from the JMA multilingual dictionary (2026-03-26). Not affiliated with JMA or any government agency.