A line-shaped rain band may develop over northern Kyushu on June 24, 2026, bringing warning-level heavy rain to Kyushu and Shikoku [1, 2].
These weather patterns pose a significant risk of flooding and landslides in southern Japan. The potential for a linear precipitation band, a concentrated area of intense rainfall, increases the likelihood of sudden, severe weather events that can overwhelm local infrastructure.
Forecasters said that moist air from Typhoon No. 7 and Typhoon No. 8 is moving northward [1, 2]. This atmospheric movement is strengthening the rain front, which increases the risk of a linear precipitation band forming [1, 2].
Specific warnings were issued for northern Kyushu, including Saga, Nagasaki, Kumamoto, and Fukuoka [1, 2]. In southern Nagasaki, officials said that a line-shaped rain band could develop within three hours after 5 a.m. [1]. There is a further risk that a linear precipitation band could develop around midday [2].
While southern regions face severe weather, the forecast for northern Japan is more favorable. Areas away from the rain front are expected to see the return of sunshine and rising temperatures [1, 2].
Weather officials said that the combination of the two typhoons is the primary driver of the current instability. The rain front continues to shift, creating a stark contrast between the heavy precipitation in the south and the clearing skies in the north [1, 2].
“A line-shaped rain band may develop over northern Kyushu”
The interaction between multiple tropical cyclones and a stationary rain front creates a volatile weather system. When linear precipitation bands form, they can drop immense volumes of water in a short period, often leading to flash floods. This creates a dual-track weather scenario for Japan, where the south faces emergency-level rain while the north experiences a return to summer heat.
