Rounds of Rain for South Korea and Southern Japan This Week

By Eric Leister, Meteorologist
June 3, 2014; 5:30 AM ET
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Over the next several days, a slow-moving storm will pass from South Korea into southern Japan bringing the threat for heavy rainfall and local flooding problems.

Rain fell much of the time from Monday through Tuesday in Seoul, South Korea, where rainfall averaged 12-25 mm (0.50-1.00 inch). The heaviest rain fell south of Seoul, near the western coastline where 25-50 mm (1.00-2.00 inches) was common.

Rainfall for much of South Korea was near normal during the month of May but for the year has been a bit below normal. Outside of any localized flooding problems, this rainfall has been beneficial for the region.

Seoul, South Korea, Forecast
South Korea Weather Center
Japan Weather Center

The flooding threat will also be over western and southern Japan, from Hiroshima through the southern islands of the country. The heaviest rainfall is expected from Tuesday through Thursday before the rain pushes farther east. The rain will be capable of producing localized flooding.

Rainfall over southern Japan will be on the order of 1-3 inches (25-75 mm) for most areas; however, rainfall brought 75-150 mm (3-6 inches) of rain to the northern Ryukyu Islands. Rounds of rain will linger into the weekend across southeast Japan, from Shikoku through the southeast coast of Honshu. These areas can see localized rainfall amounts in excess of 6 inches (150 mm).

Lonely Swan watercycle in Han river, courtesy of

This rain will eventually push into the Tokyo and eastern parts of Japan, but the heaviest rainfall will stay to the southwest of the Greater Tokyo area. Rainfall will generally average 2-4 inches (50-100 mm) from Friday through Sunday.

Due to the slow movement of this storm system, many locations will receive rainfall for multiple days in a row. Although major river flooding is not expected, some smaller streams as well as urban areas can experience flooding across the region this week. Meteorologist Alan Reppert contributed to this story


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