Overall Green alert Flood for Madagascar
in Madagascar

Flood impact summary

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

GDACS ID: 1100340
Deaths: 32
Displaced: 13711
Region: Diana, Sofia, Madagascar, Boeny, Betsiboka, Analamanga, Alaotra-Mangoro, Mahajanga, Andapa, Antananarivo
Countries: Madagascar
From - To 07 Jan - 07 Jan
Known identifiers for this event:

GDACS Score

For more info on GDACS alert score click here.

Impact Assessement as of 07-01-2020

SENDAI Indicator A N Country Location Info
death 13 Madagascar Boeny
death 9 Madagascar Betsiboka
death 2 Madagascar Andapa
death 4 Madagascar Antananarivo
death 1 Madagascar Sofia
death 3 Madagascar Alaotra-Mangoro
missing 18 Madagascar Boeny
SENDAI Indicator B N Country Location Info
affected 93000 Madagascar Madagascar
displaced 1515 Madagascar Mahajanga
displaced 60 Madagascar Andapa
displaced 136 Madagascar Antananarivo
displaced 12000 Madagascar Diana
SENDAI Indicator C N Country Location Info
houses damaged 10000 Madagascar Diana
houses destroyed 24 Madagascar Boeny
houses destroyed 12 Madagascar Betsiboka
houses destroyed 7 Madagascar Analamanga
houses destroyed 40 Madagascar Antananarivo

Satellite Observation

Satellite-based Flood extent provided by GLOFAS
Overall of the satellite-based flooded area from / to : 2019-12-31 / 2020-01-14  

Tuesday 31/12Wednesday 01/01Thursday 02/01Friday 03/01Saturday 04/01Sunday 05/01Monday 06/01Tuesday 07/01Wednesday 08/01Thursday 09/01Friday 10/01Saturday 11/01Sunday 12/01Monday 13/01Tuesday 14/01

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 32 deaths and 13711 displaced 07 Jan 2020 07 Jan 2020 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.