By Eric Leister, AccuWeather senior meteorologist
A tropical disturbance moving across the West Pacific will bring the potential for flooding and other impacts to Japan this week.
The tropical threat could still develop into the tropical depression or storm as it moves northward to the east of Taiwan and crosses near Japan's Ryukyu Islands through the middle of the week.
If tropical development does occur, the name Sepat would be given to the storm.
Regardless of development, impacts are expected across much of Japan as heavy rainfall targets the country.
The Ryukyu Islands will be the first to be impacted with downpours spreading over the islands from south to north from Tuesday into Wednesday.
Flash flooding will be the biggest concern, although the islands will also be affected by rough seas and surf into Thursday.
Rainfall will reach Kyushu Tuesday night, with downpours spreading over the island and neighboring parts of Shikoku and far southern Honshu on Wednesday.
Rain will expand into central Honshu on Wednesday night and reach Tokyo by Thursday.
Rounds of rainfall are expected across much of Japan from Thursday into Friday; however, Hokkaido will be largely spared with any rainfall limited to far southern parts of the island.
These downpours will increase the risk of flash flooding while also heightening the risk of mudslides, especially in areas of rugged terrain.
Travel disruptions are also possible, especially in areas that experience heavy rainfall around peak travel times .
Rough seas will be a concern for the southern and eastern coastline of Japan from Wednesday into Friday.
A period of rain may also streak across South Korea on Wednesday; however, no widespread flooding or travel disruptions are expected.
Another round of heavy rainfall is possible across central and southern Japan this weekend as a storm arrives from China.
This heavy rainfall on top of the rain expected this week will bring an elevated risk for flooding and continue the threat of mudslides.
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