Historic Flooding Strikes Joso, Japan, in Wake of Etau

By By Eric Leister, Meteorologist
September 14, 2015, 2:07:52 AM EDT

Days of heavy rainfall have left parts of Japan dealing with historic flooding as rain from former Tropical Storm Etau finally diminishes.

Rainfall totals of 150-300 mm (6-12 inches) were common across southern and central Honshu with localized amounts exceeding 600 mm (24 inches).

Thousands Evacuated as Floods Hit Central Japan


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The heaviest rain shifted into northern Honshu Thursday night and Friday averaging 50-100 mm (2-4 inches); however, locations such as Sendai received more than 250 mm (10 inches) of rain.


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Some of the hardest-hit parts of Japan include Ibaraki and Tochigi prefectures, located northeast of Tokyo. Nasushiobara in Tochigi Prefecture reported more than 550 mm (22 inches) of rain in only 24 hours from Wednesday into Thursday.


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Rainfall rates greater than 50 mm (2 inches) per hour were recorded across these prefectures on Thursday as the Kinugawa River broke through a flood berm sending a surge of flood waters rushing into the city of Joso.

The flood waters began rushing into the city of 60,000 people at 12:50 p.m., local time, according to the Associated Press.


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