Yokosuka City on Highest Alert as Meteorological Observatory Issues Level 4 Landslide Warning

The Yokohama Regional Meteorological Observatory issued a Level 4 landslide disaster warning for Yokosuka City in Kanagawa Prefecture at 6:53 am on June 3, 2026. This classification represents the highest tier of disaster alert in Japan, indicating that life-threatening landslides are imminent and requiring strict vigilance from residents and local authorities. The public alert for this warning was subsequently broadcast at 7:16 am.

The warning was issued against the backdrop of Typhoon 6, which has precipitated a series of severe weather events across the region. Concurrently, the observatory issued Level 4 landslide warnings for Ito, Atami, and Shimoda in Shizuoka Prefecture. A line-shaped precipitation band has developed in the Izu region of Shizuoka, further compounding the disaster risk and necessitating safety assurance measures.

Meteorological authorities are actively monitoring evacuation information from local municipalities in Yokosuka. The observatory has emphasised the need for strict vigilance due to the very high risk of landslides. While specific advice regarding cliff-side residents was truncated in initial reports, the overarching directive remains the immediate assessment of evacuation orders and safety protocols by local government bodies.

This alert follows a rapid escalation of weather warnings earlier in the day. The Japan Meteorological Agency had issued predictions for line-shaped precipitation bands in southern Wakayama, Mie, and Tokushima prefectures on June 2. By 1:00 am on June 3, these weather systems had already caused power outages for approximately 17,000 households across Shikoku.

The severity of the situation was confirmed at 1:21 am when the Japan Meteorological Agency issued a meteorological disaster warning for southern Tokushima Prefecture, validating the development of the precipitation bands. The current warnings in Kanagawa and Shizuoka reflect the continued intensity of Typhoon 6, with authorities urging residents to remain alert to evolving conditions and official evacuation guidance.