Typhoon 6 made landfall on the southern coast of Wakayama around 04:30 JST on June 3 [1].
The storm's rapid movement and intense moisture created a dangerous weather pattern that challenged Japan's emergency infrastructure. The resulting rainfall has caused record-season heavy rain across the Pacific side of the country.
Authorities issued the first-ever Level 5 flood special warning for the Kosa River in Wakayama Prefecture [1]. This highest tier of alert signifies an imminent and extreme threat to life and property. The typhoon moved northward at a speed of 45 km/h after making landfall [2].
Line-shaped rain bands developed across the Pacific side of Japan, affecting Tokushima, Shizuoka, Kanagawa, and the Kanto region [1]. These bands produced unprecedented rainfall for the current season, leading to large-scale emergency measures. Evacuation orders were issued for 820,000 people across nine prefectures [4].
At the time of reporting, the typhoon's central pressure was 980 hPa [5]. Maximum sustained winds near the center were recorded at 25 m/s [6]. The combination of high forward speed and concentrated rain bands contributed to the severity of the flooding in southern coastal regions [2].
Emergency crews remain on high alert as the system continues to move through the region. Local officials said the scale of the evacuations was necessary to prevent casualties given the historic nature of the Kosa River warning [1].
“The first-ever Level 5 flood special warning for the Kosa River”
The issuance of a Level 5 warning for the Kosa River marks a critical escalation in Japan's disaster management history. By triggering a warning that had never been used for this specific waterway, authorities are acknowledging that current climate patterns are producing rainfall intensities that exceed historical benchmarks for the early June season.
