Overall Orange alert Flood for Japan
in Japan

Flood impact summary

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

GDACS ID: 1101571
Deaths: 0
Displaced: 300000
Region: Yamagata Prefecture, Niigata Prefecture, Ishikawa Prefecture, Aomori Prefecture, Fukui Prefecture, Fukushima Prefecture, Iwate Prefecture
Countries: Japan
From - To 03 Aug - 15 Aug
Known identifiers for this event: FL-2022-000288-JPN

GDACS Score

For more info on GDACS alert score click here.

Impact Assessement as of 05-08-2022

SENDAI Indicator B N Country Location Info
affected 72000 Japan Shizuoka
displaced 300000 Japan Yamagata Prefecture, Aomori Prefecture, Ishikawa Prefecture, Fukui Prefecture, Fukushima Prefecture, Iwate Prefecture, Niigata Prefecture
SENDAI Indicator C N Country Location Info
houses damaged 97 Japan Niigata Prefecture
houses damaged 253 Japan Ishikawa Prefecture
houses damaged 79 Japan Aomori Prefecture
SENDAI Indicator D N Country Location Info
bridges destroyed 1 Japan Yamagata Prefecture, Niigata Prefecture

Satellite Observation

Satellite-based Flood extent provided by GLOFAS
Overall of the satellite-based flooded area from / to : 2022-07-27 / 2022-08-22  

Wednesday 27/07Thursday 28/07Friday 29/07Saturday 30/07Sunday 31/07Monday 01/08Tuesday 02/08Wednesday 03/08Thursday 04/08Friday 05/08Saturday 06/08Sunday 07/08Monday 08/08Tuesday 09/08Wednesday 10/08Thursday 11/08Friday 12/08Saturday 13/08Sunday 14/08Monday 15/08Tuesday 16/08Wednesday 17/08Thursday 18/08Friday 19/08Saturday 20/08Sunday 21/08Monday 22/08

Timeline of revisions

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

IDAlert ColorPopulation affectedStart DateEnd DateSource
1 0 deaths and 300000 displaced 03 Aug 2022 10 Aug 2022 GLOFAS
2 0 deaths 13 Aug 2022 15 Aug 2022 GLOFAS

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.