Two typhoons are expected to strike Honshu over the weekend of June 24 and 25 [1, 2].
The simultaneous approach of Typhoon 7 and Typhoon 8 creates a high-risk weather scenario for central Japan, coinciding with severe rain-driven disasters already occurring in the south.
In Kagoshima Prefecture, a line-shaped rain band developed at 8:48 JST on June 24 [2]. This system formed as a stationary rainy-season front fed moist air into the Kyushu region [1, 2]. The resulting precipitation was intense, with Satsumasendai recording 71.0 mm of rain within a single hour [2]. Meteorologists said total rainfall for Kagoshima is forecast to reach 250 mm [2].
The heavy rains have already caused structural damage in Saga Prefecture. A landslide occurred at a group home, though no injuries were reported because all residents were evacuated [2].
Forecasters said Typhoon 7 is expected to approach Okinawa on Saturday, June 24 [2]. Simultaneously, Typhoon 8 is projected to move faster, potentially reaching the Tokai region on the same day [2]. This double-typhoon trajectory increases the likelihood of widespread flooding and wind damage across Honshu, the largest of Japan's main islands.
Local authorities are monitoring the interaction between the northward-moving tropical systems and the existing rainy-season front. The combination of these factors may exacerbate rainfall totals beyond the initial forecasts in both the Kyushu and Honshu regions [1, 2].
“Two typhoons are expected to strike Honshu over the weekend.”
The convergence of a stationary seasonal front and two separate tropical cyclones creates a compounding disaster risk. When line-shaped rain bands interact with approaching typhoons, the resulting moisture surge often leads to unpredictable and extreme precipitation totals, increasing the probability of landslides and flash floods across multiple Japanese prefectures simultaneously.
