On Monday, Typhoon Dujuan delivered unprecedented rainfall and powerful winds across eastern Japan, triggering emergency warnings for landslides and causing extensive disruptions to transportation. The Japan Meteorological Agency issued a Level 5 landslide alert for Oshima in the Izu Islands at 12:40 p.m. Rainfall had already exceeded 500 millimeters in parts of the island chain, with Chiba Prefecture experiencing over 300 millimeters from Saturday through early Monday afternoon. Authorities advised residents to remain alert for flooding, swollen rivers, and hazardous waves.