Heavy rain from two approaching tropical storms caused flooding and triggered landslide warnings across western Japan on Friday, June 26, 2024 [1].
The convergence of these weather systems with a stalled seasonal rain front creates a high risk of infrastructure failure and casualties in vulnerable coastal regions.
Two tropical storms, identified as Mekkhala and Jangmi, are currently approaching the region [1, 2]. Storm Mekkhala was positioned off the western coast of Japan's southern remote island of Amami, while Storm Jangmi continued to move toward the mainland [1, 2]. The combined impact of these systems has battered western Japan, specifically affecting the Amami Islands and the Ryukyu Islands, including Okinawa [1, 2].
Local authorities issued warnings for both flooding and landslides as the torrential rain persisted. The weather pattern is the result of the two storms interacting with a seasonal rain front that has remained stationary over the country [1, 3].
The impact of the weather systems extended beyond Japan. In Taiwan, torrential rain from the passing storm caused widespread shutdowns, leaving more than five million people off work or school [3].
Emergency services in Japan remain on alert as the storms move through the region. The government continues to monitor the stalled rain front to determine if additional evacuations are necessary for residents in the Amami and Ryukyu chains [1, 2].
“Heavy rain from two approaching tropical storms caused flooding and triggered landslide warnings across western Japan.”
The interaction between multiple tropical systems and a stalled seasonal front amplifies the volume of precipitation, increasing the likelihood of catastrophic landslides in Japan's mountainous terrain. The regional scale of the disruption—stretching from Taiwan to the Ryukyu Islands—highlights the vulnerability of East Asian coastal infrastructure to concurrent weather events during the storm season.
