Record-breaking rainfall triggers highest-level disaster alerts in Tochigi and Gunma
Emergency Safety Assurance orders issued for thousands as flooding and landslides disrupt infrastructure across northern Japan.
Record-breaking heavy rain has struck Tochigi and Gunma prefectures, with conditions worsening beyond initial meteorological forecasts due to the influence of moist air. The extreme weather event, potentially driven by linear precipitation bands, has overwhelmed local drainage systems and triggered Japan’s highest-level disaster alert, known as "Emergency Safety Assurance."
The Hagi River, which flows through the cities of Sano and Ashikaga in Tochigi Prefecture, has flooded, prompting authorities to issue the most severe safety assurance orders for areas along its banks. This Level 5 alert indicates that lives are at imminent risk and mandates immediate evacuation for residents in the affected zones.
In Sano City, the "Emergency Safety Assurance" order was applied to 6,520 people across 2,249 households living near the Hagi River. The order was activated following confirmed reports of river flooding, marking a critical escalation in the local disaster response framework.
Ashikaga City issued broader evacuation orders to 89,572 residents due to warnings regarding heavy rain and the high danger of landslides. Reports have since confirmed landslides in Ashikaga, compounding the humanitarian impact of the storm system.
Further south in Gunma Prefecture, multiple flood reports have been logged, indicating that the weather system’s impact extends beyond the immediate river basins of Tochigi. Authorities continue to monitor the situation as the moist air mass persists, with emergency services coordinating responses to the widespread flooding and infrastructure strain.
