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Overall Orange alert Flood
in Japanfrom 05 Jul 2018 00:00 UTC to 11 Jul 2018 00:00 UTC
GDACS Event Report - Flood impact

Summary

Description: Japan - Floods and landslides Very heavy rain has been affecting several areas of the central and southwest Japan over the weekend causing floods and triggering landslides. According to media, as of 9 July, at least 100 people were killed, another 50 have gone missing, hundreds of homes were damaged and 1.5 million people have been advised to evacuate in the prefectures of Hiroshima and Okinawa. Japan - Floods and landslides UPDATE (JMA, WMO, Local media) Very heavy rain has been affecting the central and southwestern areas of the country over the past few days causing casualties and widespread damage. Local media reported, as of 10 July, that the death toll reached 128 people. Most deaths happened in the prefectures of Hiroshima and Okayama after several landslides triggered by heavy rain. They also reported, as of the same date, that over 11 200 people were advised to evacuate and more than 4 600 houses were damaged in Honshu, Shikoku and Kyushu islands. Over the next 24 hours, moderate rain may still affect the already affected areas of the country. The Japan Meteorological Agency has issued, as 10 July early morning UTC, a warning for floods in Hiroshima and Kurashiki prefecture (Honshu island), as well as several warnings for heavy rain ground-loosening in central Honshu island. Japan - Floods and landslides UPDATE (JMA, WMO, Local media) Local media reported, as of 11 July, that the death toll reached 179 people and dozens are still missing. The death toll is expected to rise. Most deaths happened in the prefectures of Hiroshima and Okayama after several landslides triggered by very heavy rain over 6-8 July. They also reported, as of the same date, that more than 4 600 houses were damaged and over 260 000 people were left without water in Honshu and Shikoku islands.

This flood is expected to have a medium humanitarian impact based on the magnitude and the affected population and their vulnerability.

Updated: this report is based on update 4: (11 Jul 2018 11:00) .

  • Duration: 05/07/18 to 11/07/18
  • Impact: 179 killed and 11200 displaced

Locations affected:

  • regions: Hirosima
  • provinces:
  • locations:

  • Severity: class 1 (i.e. large flood event with significant damage to structures or agriculture; fatalities; and/or 1-2 decades-long reported interval since the last similar event)

The alert score is based on the reported death and displaced. Red = 1000 or more people killed or 800000 or more people displaced or international assistance already required. Orange = 100 or more people killed or 80000 or more displaced.

Satellite observations

Flood polygons: This polygon (translucent blue with a blue border) is drawn by the analysts recording the flood event. It is meant to include all the areas reported as affected, by official source or the media. It does not represent the area actually under water.
Microwave flood detection: Flooded area, as detected in microwaves by the Global Flood Detection System of the JRC, based on NASA TRMM/GPM observations. This system has a rather low resolution (of 5-10km) but is not affected by clouds. For more details, see http://www.unisdr.org/files/9622_LBNA23303ENC002.pdf. The areas with a flood signal along the coast are an artefact of the system and should not be considered.
Optical Flood detection: Flooded area as detected in optical wavelengths by NASA/MODIS, known as "MODIS Flood Product". Data are made available by NASA GSFC Flood Mapping Project, http://oas.gsfc.nasa.gov/floodmap/index.html. Resolution of 250m, heavily affected by cloud cover.
Rain: Rainfall accumulaiton of the past 24h, as detected by the Global Precipitation Measurement mission of NASA. For more information, see https://www.nasa.gov/mission_pages/GPM/main/index.html.

The time evolution of all layers since the first day the flood event was recorded, can be seen by dragging the slider under the satellite map.

Timeline of revisions

For accessing reports of previous advisories, please click on the advisory number in the table below.

IDAlert ColorPopulation affectedSourceDate added
4 179 killed and 11200 displaced JRC 11 Jul 2018 11:00
3 179 killed and 11200 displaced JRC 11 Jul 2018 10:40
2 128 killed and 11200 displaced JRC 10 Jul 2018 15:20
1 100 killed and 1500000 displaced JRC 09 Jul 2018 11:50

More information

Data resources

For a full list of available products related to this event, please refer to the GDACS Data Resources page.

About the data

Information related to the flood has been collected from official and media reports by the Dartmouth Flood Observatory.

Disclaimer

While we try everything to ensure accuracy, this information is purely indicative and should not be used for any decision making without alternate sources of information. The JRC is not responsible for any damage or loss resulting from the use of the information presented on this website.