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: Shizuoka
Countries: Japan
From - To 03 Aug - 15 Aug
Known identifiers for this event: FL-2022-000288-JPN


For more info on GDACS alert score click here.

Impact Assessement as of 14-08-2022

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


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 FloodList
2 0 deaths 13 Aug 2022 15 Aug 2022 FloodList

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.