# Heavy rainfall and flooding in Japan > Live situation record from CLSTR: https://clstr.news/situations/heavy-rainfall-and-flooding-in-japan > Updated: 2026-08-31T03:52:52.000Z. Sources: 5. Developments: 2. Heavy rainfall and sudden “guerrilla rainstorms” in Japan have led to significant safety risks and infrastructure concerns. In Chiba Prefecture, record-breaking rainfall in mid-August 2026 resulted in over 3,000 vehicles becoming stranded on public roads due to flooding. Safety assessments indicate that deep water poses severe risks to drivers, noting that water depths of 60cm can cause engines to stall and external pressure can make car doors impossible to open. Experts advise against entering flooded roads due to hidden hazards like open manholes and debris. Subsequent surveys indicate that 65.4% of respondents believe the frequency or intensity of such rainstorms has increased. This has led to calls for improved municipal drainage infrastructure, with 64.4% of those surveyed desiring better gutters and rainwater storage. Additionally, the flooding has highlighted financial vulnerabilities for vehicle owners, particularly those using residual value credit, who may face immediate full loan repayments in the event of a total loss. ## Timeline ### 2026-08-31: Japan: Rising heavy rain frequency prompts calls for better drainage and insurance awareness A survey shows 65% of Japanese respondents notice an increase in heavy rain, leading to calls for better drainage infrastructure and heightened awareness of vehicle insurance and loan risks during floods. 3 sources. https://clstr.news/cluster/japan-rising-heavy-rain-frequency-prompts-calls-for-better-drainage-and-insurance-awareness ### 2026-08-23: Japan rainfall warnings: Vehicle flooding risks and safety advice Following record rainfall in Chiba, experts warn against driving through flooded roads, noting that even SUVs can stall in deep water and face significant risks of entrapment. 2 sources. https://clstr.news/cluster/japan-rainfall-warnings-vehicle-flooding-risks-and-safety-advice --- Cite as: Heavy rainfall and flooding in Japan. CLSTR, https://clstr.news/situations/heavy-rainfall-and-flooding-in-japan