Overall Orange alert Flood
in Brazil

Flood impact summary

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

GDACS ID: 1102592
Deaths: 144
Displaced: 540548
Region: Metropolitan Region of Porto Alegre
Countries: Brazil
From - To 23 Apr - 17 May
Known identifiers for this event: FL-2024-000063-BRA


For more info on GDACS alert score click here.

Impact Assessement as of 06-05-2024

SENDAI Indicator A N Country Location Info
death 1 Brazil Santa Catarina
death 143 Brazil Metropolitan Region of Porto Alegre
missing 130 Brazil Metropolitan Region of Porto Alegre
SENDAI Indicator B N Country Location Info
affected 36 Brazil Laranjeiras
affected 29 Brazil Aracaju
affected 933 Brazil Maruim
affected 248 Brazil Almeirim
affected 1 Brazil Riacho das Almas
affected 2115000 Brazil Metropolitan Region of Porto Alegre
displaced 540000 Brazil Metropolitan Region of Porto Alegre
displaced 32 Brazil Estância
displaced 18 Brazil Riachuelo
displaced 100 Brazil Rosário do Catete
displaced 32 Brazil Santa Catarina
displaced 362 Brazil Alagoas
displaced 4 Brazil Aracaju
injured 806 Brazil Metropolitan Region of Porto Alegre
SENDAI Indicator C N Country Location Info
houses 62 Brazil Almeirim
houses damaged 20 Brazil Rosário do Catete

Satellite Observation

Satellite-based Flood extent provided by GLOFAS
Overall of the satellite-based flooded area from / to : 2024-04-16 / 2024-05-24  

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 100 displaced 23 Apr 2024 25 Apr 2024 GLOFAS
2 143 deaths and 540000 displaced 30 Apr 2024 06 May 2024 GLOFAS
3 1 deaths and 32 displaced 03 May 2024 05 May 2024 GLOFAS
4 0 deaths and 362 displaced 06 May 2024 08 May 2024 GLOFAS
5 0 deaths and 54 displaced 07 May 2024 09 May 2024 GLOFAS
6 0 deaths 14 May 2024 16 May 2024 GLOFAS
7 0 deaths 15 May 2024 17 May 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.