Locally heavy rainfall and mountain snow can lead to areas of flooding and travel disruptions as a storm passes near Japan into midweek.
Downpours drenched parts of South Korea and southern Japan into Monday as the storm tracked across the South China Sea and just south of Kyushu.
As the storm continues to organize over the open water just south and east of Japan, rainfall will overspread the remainder of the country into midweek.
Heavy rainfall arrived in Kyushu and Shikoku from Sunday into Monday with widespread reports of 25-100 mm (1-4 inches) of rainfall.
The island of Yakushima, located just south of Kyushu, reported nearly 250 mm (10 inches) of rainfall in just 12 hours from Sunday into early Monday.
By Tuesday, rain will overspread much of central and northern Honshu, while conditions will begin to improve across Kyushu, and Shikoku.
Widespread rainfall totals of 25-75 mm (1-3 inches) are expected much of Honshu through Wednesday.
A period of torrential rainfall will bring a high risk for flooding and travel disruptions to eastern Honshu, including the Greater Tokyo Area, from Tuesday afternoon into Wednesday morning.
Locations in this region can expect rainfall totals to climb into the 75- to 150-mm (3- to 6-inch) range. An AccuWeather Local StormMax™ of 200 mm (8 inches) is possible, especially into the higher terrain.
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Cities that can receive some of the heaviest rainfall include Tokyo, Yokohama, Chiba and Sendai.
"This amount of rain in a short period of time can lead to flash flooding especially in low-lying and poor drainage areas, as well as mudslides in areas of rugged terrain," stated AccuWeather Senior Meteorologist Dave Houk.
Other impacts may include power outages and mudslides.
Meanwhile, enough cold air in the Ou and Echigo Mountain ranges can cause precipitation to fall as snow in the highest elevations.
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