Double typhoons are triggering disaster-level rainfall across Japan, causing landslides, severe flooding, and infrastructure failure on June 26, 2026 [1].

The weather systems pose a significant threat to millions of residents as they move toward mainland Japan, with the Kanto region expecting a direct hit on June 27, 2026 [2].

Typhoon 7 is expected to approach the vicinity of Amami Oshima at 4 p.m. today [2]. Even before the center of the storm reaches various regions, the associated heavy rain has already caused devastation. In Nagano Prefecture, landslides have struck residential areas [1]. In Nara Prefecture, witnesses reported the appearance of muddy torrents in Ikoma City [3].

In Osaka Prefecture, the intensity of the rain led to extreme drainage failures. In Higashiosaka City and Ikuno Ward, water erupted from manholes with enough force to lift sections of asphalt [3]. A witness who captured the scene said the water column reached approximately six meters in height [1].

"It was a sound I had never heard before," the photographer said [1].

Other residents reported the onset of the storms in the early morning hours. One witness said that around 4:30 a.m. or 5 a.m., there was a roar of heavy rain and they received reports that houses were in danger [1].

Emergency services continue to monitor river levels and slope stability as the storms progress. The combination of high winds and concentrated torrential rain has overwhelmed drainage systems, turning city streets into hazardous zones [1], [3].

“"It was a sound I had never heard before."”

The occurrence of 'double typhoons' increases the risk of prolonged precipitation and compounding disasters. When two systems interact, they can enhance rainfall intensity and complicate evacuation efforts, particularly in densely populated areas like the Kanto region. The reports of manhole eruptions and asphalt displacement indicate that urban drainage infrastructure is being pushed beyond its design capacity, suggesting a high risk of flash flooding in metropolitan centers.