Japan Travel Fixes
← Safety, Lost Children & Lost Items
Is it okay to keep hiking or playing in a river if a weather warning has been issued?
No. When a municipality or the Japan Meteorological Agency issues a heavy rain, flood, or landslide warning, ignoring it and continuing to hike or wade in rivers has genuinely cost lives most years, through sudden rises in water level, flash floods, and landslides.
Rivers in Japan can rise sharply within a short time after rain — you can be caught out even if it isn't raining where you are, because the rain fell upstream.
Hiking trails are often closed or restricted once a warning is issued, and entering anyway can make rescue itself far harder in bad weather.
Warnings are mostly issued in Japanese, but the Japan Meteorological Agency's disaster information page and NHK World sometimes carry emergency information in other languages — worth bookmarking before you head out for mountain or river activities.
Asking a local about current conditions
今、この川（山）は安全ですか？
Ima, kono kawa (yama) wa anzen desu ka?
Is this river (mountain) safe right now?