Key Facts
• At 4:01 PM on July 11, Nagano Meteorological Observatory issued a weather warning.
• Unstable atmospheric conditions expected due to warm, moist air and upper-level cold air.
• Heavy rain with thunder and hail possible until late night on July 11.
• Predicted hourly rainfall: North 30 mm, Central 30 mm, South 40 mm.
• Predicted 24-hour rainfall (July 11, 6 PM to July 12, 6 PM): North 50 mm, Central 60 mm, South 80 mm.
• Risks include landslides, flooding in low-lying areas, and river swelling.
• Additional hazards: lightning, strong winds, and hail affecting crops and facilities.
• Next update scheduled for 11 PM on July 11.
Summary
The Nagano Meteorological Observatory has issued a warning for heavy rain, thunderstorms, and hail in Nagano Prefecture, effective until late night on July 11. Unstable atmospheric conditions, caused by warm, moist air and upper-level cold air, are expected to bring intense rainfall, with hourly precipitation reaching up to 40 mm in the southern region. Over 24 hours, rainfall could total up to 80 mm in the south. Residents are advised to remain vigilant against landslides, flooding, and river swelling. Additional precautions are necessary for lightning, strong winds, and hail, which may damage crops and facilities. The next update is expected at 11 PM on July 11.
