Overall Green alert Flood
in Japan

Flood impact summary

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

GDACS ID: 1102760
Deaths: 6
Displaced: 55
Region: Sasebo City, Matsuyama, Akune
Countries: Japan
From - To 12 Jul - 14 Jul
Known identifiers for this event:

GDACS Score

For more info on GDACS alert score click here.

Impact Assessement as of 14-07-2024

SENDAI Indicator A N Country Location Info
death 6 Japan Matsuyama
SENDAI Indicator B N Country Location Info
affected 229229 Japan Sasebo City
affected 18538 Japan Akune
displaced 55 Japan Matsuyama

Satellite Observation

Satellite-based Flood extent provided by GLOFAS
Overall of the satellite-based flooded area from / to : 2024-07-05 / 2024-07-21  

Friday 05/07Saturday 06/07Sunday 07/07Monday 08/07Tuesday 09/07Wednesday 10/07Thursday 11/07Friday 12/07Saturday 13/07Sunday 14/07Monday 15/07Tuesday 16/07Wednesday 17/07Thursday 18/07Friday 19/07Saturday 20/07Sunday 21/07

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 6 deaths and 55 displaced 12 Jul 2024 14 Jul 2024 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.