Skip to content

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

FreeJapan Alert Decoder

Japan alert decoder · レベル3高潮警報

Level 3 Warning (Storm Surge) · Level 3

Elderly / slow evacuees go now; others get ready · official rules as of 2026-10-17

← Decode another alert · Earthquake Early Warning on a train

Or tap one

Where are you? (optional)
Level 3Elderly / slow evacuees go now; others get ready

レベル3高潮警報

Level 3 Warning (Storm Surge)

Red, Alert Level 3 equivalent: danger is rising. People who need time to evacuate (elderly, disabled, small children) should start evacuating; everyone else gets ready. Hazard: sea water flooding the coast during a typhoon or deep low. Careful: before 2026-05-29 a plain 高潮警報 was Level 4 equivalent; now レベル3高潮警報 is Level 3 and Level 4 is レベル4高潮危険警報.

What to do now

  1. Elderly people and those who need help: evacuate now.
  2. Everyone else: check the hazard map, pack, and be ready to leave.
  3. Check KIKIKURU and your municipality's notices.
  4. Stay away from the coast, harbours and low coastal land.

Issued by: JMA. Live status: JMA warnings map (English)JMA earthquake information (English)JMA tsunami information (English)

source 1source 2source 3

Share on X

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.