Japan is bracing for heavy rain and potential flooding as Typhoon 7 and Typhoon 8 approach the archipelago on June 25, 2024 [1].
The combined influence of these storms and a seasonal rainy-front creates a high risk of prolonged precipitation. This weather pattern threatens critical infrastructure and public safety, prompting the Japan Meteorological Agency (JMA) and the Ministry of Land, Infrastructure, Transport and Tourism (MLIT) to issue joint calls for strict vigilance [1], [3].
Typhoon 7 was expected to be closest to Okinawa in the early morning of June 25, 2024 [5]. The storm is projected to make landfall on Honshu over the weekend of June 25-27, 2024 [2].
In Western Japan, the impact is already being felt in the Kyushu region, specifically in Fukuoka, Ōita, and Nagasaki [1]. Authorities have issued Level 4 landslide-danger warnings for six municipalities in Fukuoka Prefecture [3]. These warnings indicate a high risk of ground failure due to saturated soil.
Travel disruptions have begun as airlines adjust schedules to account for the storm's path. Two flights, ANA flight 22 and JAL flight 11, have already been canceled [4].
While Western Japan faces immediate threats, the Kanto region is expected to experience the peak of the weather system on Saturday, June 29, 2024 [3]. The JMA and MLIT continue to monitor the interaction between the storms. Reports on the total number of active systems vary, with some sources citing two typhoons and others reporting a triple-typhoon situation involving Typhoons 7, 8, and 9 [3], [6].
Residents in affected areas are urged to monitor river levels and evacuate if local authorities issue orders. The risk of river flooding remains a primary concern for the MLIT as the storms move inland [1], [2].
“Level 4 landslide-danger warnings have been issued for six municipalities in Fukuoka Prefecture.”
The convergence of multiple tropical cyclones and a stationary rainy-front increases the volume of precipitation beyond what a single storm would produce. This creates a compounding effect where soil saturation from the first system heightens the landslide and flood risk for subsequent systems, complicating evacuation efforts and infrastructure resilience in Japan's mountainous regions.
