Key Facts
• August 19, 2025, 5:08 PM: Meteorological Agency issues ‘Heavy Rain and Thunderstorm Alert No. 1’.
• Hokkaido: Up to 80mm of rainfall expected in 24 hours (Aug 19-20).
• Tohoku: Up to 120mm of rainfall expected in 24 hours (Aug 19-20).
• August 20-21: Tohoku may experience an additional 80mm of rainfall.
• Severe weather caused by a low-pressure system and warm, moist air.
• Hokkaido: Landslides, flooding, and river overflow risks remain high.
• Tohoku: Similar risks persist, with additional threats of lightning and tornadoes.
• August 19: Hokkaido records 168.5mm of rainfall in Otobe Town (24-hour maximum).
• August 20: Japan Sea side of Tohoku may see up to 150mm of rainfall.
• Residents advised to monitor weather updates and take safety precautions.
Summary
The Japan Meteorological Agency has issued a heavy rain and thunderstorm alert for Hokkaido and Tohoku, warning of unstable atmospheric conditions due to a low-pressure system and warm, moist air. Hokkaido is expected to receive up to 80mm of rainfall within 24 hours, while Tohoku may see up to 120mm. Additional rainfall is forecast for August 20-21, with Tohoku potentially receiving another 80mm. Residents in both regions are urged to remain vigilant against landslides, flooding, and river overflows. Severe weather, including lightning and tornadoes, poses further risks. Authorities recommend monitoring weather updates and ensuring safety measures are in place.
