Key Facts
• On July 2, 2025, Gunma Prefecture’s Katashina Village experienced 120mm of rain in one hour.
• The rainfall occurred by 2:20 PM and triggered a “Record-Breaking Short-Term Heavy Rainfall Information” alert.
• Radar analysis confirmed the development of rain and thunderclouds across parts of the Kanto region.
• Authorities warn of landslides, flooding in low-lying areas, and rising river levels.
• Residents in high-risk areas are advised to seek safer locations, such as higher floors.
• “Record-Breaking Short-Term Heavy Rainfall Information” is issued for rare, disaster-level rainfall events.
• Evacuation timing is critical: Level 3 advises vulnerable individuals to evacuate, Level 4 requires all residents to act, and Level 5 indicates ongoing disasters.
• Early evacuation is essential as severe weather can worsen road conditions and increase risks.
• Residents are encouraged to evacuate proactively and assist neighbors during emergencies.
Summary
Gunma Prefecture’s Katashina Village experienced an unprecedented rainfall of 120mm within one hour on July 2, 2025, prompting a “Record-Breaking Short-Term Heavy Rainfall Information” alert. The Kanto region saw the rapid development of rain and thunderclouds, raising concerns about landslides, flooding, and river surges. Authorities emphasize the importance of timely evacuation, with specific guidelines for different alert levels. Residents are urged to prioritize safety, evacuate early, and assist others in need. This rare weather event highlights the critical need for disaster preparedness and proactive action.
