Key Facts
• August 19, 2025: Southern Hokkaido experiences heavy rain exceeding 100mm in Otobe Town.
• Noon forecast: Active thunderclouds in Southern Hokkaido, peak expected by early afternoon.
• Rainfall intensity: Up to 50mm per hour in Southern Hokkaido.
• Alerts issued: Heavy rain and flood warnings for Hakodate, Hokuto, and other areas.
• Landslide warnings: Yakumo Town Kumaishi, Kaminokuni Town, and Otobe Town.
• Tornado and lightning risks: Residents advised to stay indoors during thunderstorms.
• Northern and Okhotsk regions: Asahikawa and Wakkanai face severe thunderstorms by early afternoon.
• Pacific side: Heavy rain in Yakumo Town and Muroran City, peak by early afternoon.
• Weekly forecast: August 20-26, unstable weather with localized rain and high temperatures (31°C in Sapporo and Kitami).
Summary
Southern Hokkaido is experiencing severe weather conditions on August 19, 2025, with rainfall exceeding 100mm in Otobe Town and up to 50mm per hour in some areas. Heavy rain, flood, and landslide warnings have been issued for multiple regions, including Hakodate and Yakumo Town. Residents are advised to stay indoors due to risks of tornadoes and lightning. Northern and Okhotsk regions, including Asahikawa and Wakkanai, are also facing severe thunderstorms. The Pacific side, including Muroran City, will see heavy rain until the evening. The weekly forecast predicts unstable weather with localized rain and high temperatures, reaching 31°C in Sapporo and Kitami.
