Daily downpours will inundate parts of western Japan in the coming days raising the risk for flooding and mudslides.
The downpours began on Tuesday and are expected to continue into Thursday before diminishing in intensity from Friday into the weekend.
The hardest-hit areas on Tuesday were across northwest Kyushu where more than 200 mm (8 inches) was reported in Hirado and Sasebo.
Radar image showing heavy rain spreading across parts of Japan on Tuesday night, local time.
More than 100 mm (4 inches) fell in one hour during the heaviest rainfall on Tuesday and mudslide warnings have been issued for parts of Nagasaki, Saga and Fukuoka prefectures, according to NHK.
The remainder of northern Kyushu reported 50-150 mm (2-6 inches) through Tuesday evening with additional downpours expected in the coming days.
On Wednesday, downpours will target areas from northern Kyushu into southwest Honshu and northern Shikoku.
These locations will be at risk for 100-200 mm (4-8 inches) of additional rainfall from Wednesday into Wednesday night.
This rainfall on top of previous downpours will bring a high risk for flooding and mudslides. Significant travel disruptions will also be possible.
Another period of torrential rainfall is expected to western Japan on Thursday. Southwest Honshu will be at greatest risk for flooding and travel disruptions during this time with daily rainfall of 100-200 mm (4-8 inches).
Locations from Nagato to Kurayoshi will endure significant impacts with Fukuoka, Kitakyushu and Hiroshima on the edge of the heaviest rainfall.
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Residents of Kyushu, Shikoku and western Honshu should monitor this situation closely and be prepared to evacuate if warnings are issued by the local government.
Some downpours may linger into Friday; however, the threat for widespread flooding and mudslides will begin to diminish.
Additional bouts of showers and thunderstorms are possible across much of Japan this weekend.
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