Typhoon Jangmi brought approximately 500 mm of rain [1] to southern Japan this month, causing widespread flooding and landslides.
The storm's intensity and timing are unusual for the region, signaling a potentially volatile start to the summer storm season for East Asia.
The Japan Meteorological Agency (JMA) issued a Level 5 warning [2], the highest possible alert, due to the immediate risk to human life. Hosomi Takua, the JMA forecast division chief, said the situation reached a level where people must evacuate immediately because of the danger to lives.
Typhoon Jangmi intensified into a Category 3 storm, pulling a dense, rain-laden cloud band over the southern region. This atmospheric setup resulted in the heavy precipitation that overwhelmed local infrastructure and triggered earth movements in hilly areas.
According to the JMA, this event is the first time a typhoon has made landfall in Japan during the month of June in 14 years [3]. The rarity of a June landfall increases the unpredictability of the season's weather patterns.
Professor Kang Nam-young of Kyungpook National University monitored the storm's trajectory. He said that if the system moves northward toward the Korean Peninsula, it could present similar risks to that region.
Local authorities in southern Japan continued to monitor water levels as the remnants of the storm moved through the area. The JMA maintained its highest alert level as emergency crews worked to secure affected zones.
“"There is a risk of loss of life and you must evacuate immediately."”
The landfall of a typhoon in June is a statistical anomaly for Japan, suggesting a shift in seasonal timing or intensity. Because these systems often track northward, the severity of the rainfall in southern Japan serves as a critical indicator for potential flooding and storm surges in South Korea and other neighboring coastal regions throughout the summer.
