Overview

• Japan’s Meteorological Agency reports very unstable air along the Sea of Japan side from northern to western regions due to a low and an autumn rain front.
• Radar analysis indicated about 100 millimeters of rain in one hour near Noshiro, Akita, prompting a ‘record short‑duration heavy rain’ notice, with 79.5 millimeters observed in Noshiro.
• Parts of Akita were placed under landslide alerts as officials urged vigilance for flash flooding, rising rivers, lightning, tornado‑class gusts and hail.
• The Fukuoka District Meteorological Observatory says the front is expected to sag toward the southern Korean coast by Wednesday night before influencing northern Kyushu through Thursday.
• Forecasts call for up to 100 millimeters in 24 hours in parts of Tohoku and Niigata by Thursday morning, and up to 40 millimeters per hour and 90 millimeters in 24 hours in Fukuoka with possible heavy‑rain warnings if bands intensify or stall.