Japan – Thousands Evacuate Flooding in Akita Prefecture

Authorities in Akita Prefecture, north western Japan, issued evacuation orders on Sunday 23 July due to flooding after a period of heavy rain. Some areas recorded more than 300 mm in 24 hours.

Severe damage was recorded in 17 cities, in particular in Daisen, Akita city, Yokote, Semboku and Yurihonjo, according to local disaster authorities. Almost 600 homes have been flooded, with over 230 of them in Daisen city.

Over 20,000 people in Daisen were ordered to evacuate their homes on Sunday 23 July. Evacuation advisories (recommendations) were also issued for other areas of Daisen and Akita. Dozens of roads have been closed and rail travel severely affected. No injuries or fatalities were reported.

Heavy rain fell in the prefecture from 22 July. Japan’s Meteorological Agenc (JMA) said that 340 mm of rain had fallen in the city of Akita in 24 hours between 22 and 23 July 2017.

The storm caused flooding along stretches of the Omono River, while several other rivers were deemed at risk of overflowing their banks.

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Fukuoka and Oita

The flooding in Akita comes just days after as many as 25 people died in floods and landslides in Fukuoka and Oita prefectures in the south of the country.

Staggering amounts of rainfall were recorded during the flood event. In Asakura 516 mm of rain was recorded for a 24-hour period on 05 July. In fact around 500 mm fell between 12:00 and 21:00 hrs on 05 July, with 106.0 mm of rain falling in just 1 hour between 16:00 and 17:00.

Flood Summary

Last updated: July 26, 2017
Event
Akita Prefecture, Japan, July 2017
Date
July 22 to July 25, 2017
Type
Flash flood
Cause
Extreme rainfall

Locations

A - Daisen
B - Akita
C - Yokote
D - Semboku
E - Yurihonjo

Magnitude

Rainfall level
340 mm in 24 hours
Akita city - July 22 to July 23, 2017
River level
Overflowing
Omono River, Akita - July 22 to July 24, 2017

Damages

Evacuated
20,000
Akita Prefecture - July 23 to July 25, 2017
Homes damaged
600 homes
Daisen - July 23 to July 25, 2017