Overall Green alert Flood for Indonesia
in Indonesia

Flood impact summary

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

GDACS ID: 1101118
Deaths: 4
Displaced: 169
Region: North Sumatra
Countries: Indonesia
From - To 03 Oct - 06 Oct
Known identifiers for this event:

GDACS Score

For more info on GDACS alert score click here.

Impact Assessement as of 08-10-2021

SENDAI Indicator A N Country Location Info
death 4 Indonesia Luwu Utara
SENDAI Indicator B N Country Location Info
affected 70685 Indonesia North Sumatra
affected 3000 Indonesia Luwu Utara
displaced 169 Indonesia Luwu Utara
SENDAI Indicator C N Country Location Info
houses damaged 771 Indonesia Luwu Utara
houses destroyed 5 Indonesia Luwu Utara

Satellite Observation

Satellite-based Flood extent provided by GLOFAS
Overall of the satellite-based flooded area from / to : 2021-09-26 / 2021-10-13  

Sunday 26/09Monday 27/09Tuesday 28/09Wednesday 29/09Thursday 30/09Friday 01/10Saturday 02/10Sunday 03/10Monday 04/10Tuesday 05/10Wednesday 06/10Thursday 07/10Friday 08/10Saturday 09/10Sunday 10/10Monday 11/10Tuesday 12/10Wednesday 13/10

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 4 deaths and 169 displaced 03 Oct 2021 06 Oct 2021 GLOFAS
2 0 deaths 04 Oct 2021 06 Oct 2021 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.