Key Facts
• Typhoon No. 15 formed early on September 4, 2025.
• Oita Prefecture expected to enter strong wind zone by afternoon.
• Linear rainbands may form, increasing risk of heavy rain disasters.
• Typhoon moving north at 30 km/h near Tanegashima (as of noon, September 4).
• Expected to approach Oita Prefecture early on September 5.
• Predicted rainfall by September 5 noon: 200 mm (south), 180 mm (central), 120 mm (north/west).
• Maximum wind gusts forecast: 25 m/s across Oita; wave heights: 4 m (south), 2.5 m (central).
• Schools in Oita and Saiki shortened classes on September 4 morning.
• JR Nippo Line suspended between Saiki and Nobeoka on September 4.
• Oita City–Oita Airport hovercraft services canceled from afternoon.
• Warnings issued for landslides, flooding, river overflows, and high waves.
Summary
Typhoon No. 15, formed early on September 4, 2025, is advancing northward at 30 km/h near Tanegashima. Oita Prefecture is expected to experience strong winds and heavy rainfall, with linear rainbands potentially forming, raising the risk of disasters. Rainfall predictions by September 5 noon include 200 mm in the south, 180 mm in the central region, and 120 mm in the north and west. Maximum wind gusts of 25 m/s and wave heights of up to 4 meters are forecast. Schools in Oita and Saiki shortened classes, while JR Nippo Line and hovercraft services were suspended. Authorities urge caution against landslides, flooding, and high waves.
