safety physical_safety ai_generated true

AI tells a traveler in Japan to fly out / take Shinkansen / hike during a JMA typhoon warning or heavy-rain alert

ID: safety/typhoon-jma-warnings

Also available as: JSON · Markdown
95%Fix Rate
92%Confidence
4Evidence
2024-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
any active — — —

Root Cause

Japan averages 25-30 typhoons forming annually with ~3-5 making direct landfall (June-October peak). JMA warning levels: 注意報 (Advisory), 警報 (Warning), 特別警報 (Emergency Warning, rare, life-threat level). Shinkansen / regular trains suspend at Warning level; flights cancel; evacuation orders issued (Level 4 全員避難, Level 5 緊急安全確保). Tourists ignoring warnings have been killed in floods (2018 West Japan), landslides, and high winds.

generic

Workarounds

  1. 95% success Install JMA Weather app + 防災速報 + Yahoo! Bousai. Check before each travel day during typhoon season (Jun-Oct). Heed Warning-level: stay indoors, postpone non-essential travel.

    Sources: https://www.jma.go.jp/jma/en/Activities/typhoon.html

  2. 92% success If Shinkansen/flight cancels mid-trip: rebook at JR ticket office (no extra fee for typhoon cancellations). Hotels may extend bookings; many do for force-majeure. Convenience-store food + hotel stays beat outdoor risk.

    Sources: https://www.jreast.co.jp/e/customer_support/

  3. 92% success Tsunami after coastal earthquake: same protocol — JMA tsunami warning within 3 minutes. Move to high ground >10m elevation immediately if coastal AND shaking >20s.

    Sources: https://www.jma.go.jp/jma/en/Activities/tsunami.html

Dead Ends

Common approaches that don't work:

  1. Take a planned Shinkansen / domestic flight during a JMA Warning level typhoon 85% fail

    JR East / JR Tokai suspend Shinkansen service when sustained winds exceed 25 m/s. ANA / JAL cancel flights along typhoon track. Forcing through won't be possible — better to delay 24-48h for the storm to pass. Insurance often covers force-majeure delay.

  2. Hike Mt Fuji / Hakone / Kumano Kodo during a typhoon advisory 92% fail

    Mountain trails close during typhoons. Wind on exposed ridges can reach 30+ m/s. Landslides common. Tourists have been killed on Mt Fuji and elsewhere ignoring closure. JMA Advisory = postpone; Warning = absolute no.

  3. Walk along Tokyo riverside or low-lying area during heavy-rain warning 70% fail

    Tama-gawa, Arakawa, and many other Tokyo rivers can flash-flood. Underground passages flood. Recent (2019, 2021, 2023) typhoons caused tourist + resident drownings in low-lying areas. Stay on high ground / inside.