Heavy rain and two approaching tropical storms caused flooding and transport disruptions across western Japan on Friday, June 26 [1].
The convergence of these weather systems creates a high risk of landslides and urban flooding, forcing mass evacuations to prevent casualties in vulnerable coastal and mountainous regions.
Japanese authorities issued evacuation orders for approximately 1 million people [2]. The weather emergency is the result of two tropical storms, including Storm Jangmi, interacting with a seasonal rain front [3]. This combination has triggered widespread landslide warnings and significant disruptions to transport networks across the region [1].
In addition to flooding, the storms have caused critical infrastructure failures. Approximately 60,000 households were left without power [4]. While most of the current devastation is concentrated in western Japan, earlier reports noted Storm Jangmi's approach near Tateyama in Chiba prefecture on June 3 [5].
Local officials continue to monitor river levels as the storms move closer to land. The situation remains volatile due to the volume of precipitation falling over short periods, a pattern that often leads to sudden mudslides in the Japanese archipelago [1].
Emergency crews are currently deployed to assist residents in the affected zones. Authorities said citizens should follow evacuation orders immediately to avoid being trapped by rising waters or debris flows [2].
“Evacuation orders for 1 million people”
The simultaneous impact of two tropical storms and a seasonal rain front creates a compounding disaster scenario. By overwhelming drainage systems and destabilizing soil, these combined systems increase the likelihood of catastrophic landslides, which are a primary cause of death during Japan's rainy season.
