Typhoon 7 and Typhoon 8 are expected to approach and potentially make landfall in the Kanto region this weekend [1, 2].
The convergence of two tropical systems creates a volatile weather pattern that increases the risk of severe flooding and landslides in one of the world's most populous urban areas.
Both Typhoon 7 and Typhoon 8 formed on the morning of June 23, 2026 [2]. The systems are currently moving north from south of Okinawa [1, 2]. Meteorologists said they are monitoring the "Fujihara effect," a phenomenon where two nearby cyclones interact, creating complex motion that can intensify both wind and rainfall [1, 2].
Heavy precipitation is already impacting southern Japan. In Goto City Fukue, rainfall reached 164.5 mm within 24 hours up to 16:40 JST on June 23 [2]. Projections for Nagasaki Prefecture indicate rainfall may reach approximately 300 mm by the evening of June 24 [2].
The threat is compounded by a stalled rain front over Kyushu and Shikoku, which adds to the likelihood of landslides [2]. Authorities said they have issued a potential Level 4 landslide-danger warning for northern Kyushu on June 24 [2].
While some reports have mentioned Typhoon 6, current data from Oricon and FNN focus on the interaction between Typhoons 7 and 8 as the primary threat to the Kanto region [1, 2]. Residents in Tokyo and surrounding prefectures are advised to prepare for strong winds and heavy rain as the systems move north.
“Two nearby cyclones interact, creating complex motion that can intensify both wind and rainfall.”
The Fujihara effect introduces significant unpredictability into storm tracking, as the two typhoons can orbit one another or merge. This complexity makes precise landfall predictions difficult and increases the potential for extreme weather bursts, placing a higher burden on emergency management services in the Kanto region.
