Overview

• From pre-dawn into the morning of September 3, linear rainbands are possible across Akita, Yamagata, Niigata, Toyama and Ishikawa, sharply raising the risk of flash floods, river overflows and landslides.
• Forecast 24-hour rainfall through 6 p.m. on September 3 reaches up to 180 mm in Tohoku, 150 mm in Hokuriku and 120 mm in Kanto-Koshin, with locally higher totals where bands form.
• The JMA also flags a potential for linear rainbands in parts of the Kanto region, including Tokyo and surrounding prefectures, from evening into night on September 3.
• Akita has already seen intense rain, with Noshiro recording 172.5 mm in 24 hours to set a local September record and several sites exceeding 150 mm.
• Authorities in Akita issued top-tier emergency safety advisories to thousands of residents, reported multiple house inundations, and saw the Akita Shinkansen halted for about five hours.