Overall Green alert Flood
in United States

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: 1101040
Deaths: 0
Displaced: 50
Region: Marietta
Countries: United States
From - To 07 Sep - 09 Sep
Known identifiers for this event:

GDACS Score

For more info on GDACS alert score click here.

Impact Assessement as of 09-09-2021

SENDAI Indicator B N Country Location Info
displaced 50 United States Marietta
rescued 12 United States Marietta

Satellite Observation

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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 3 deaths and 200 displaced 12 Aug 2021 15 Aug 2021 FloodList
2 0 deaths and 508 displaced 21 Aug 2021 24 Aug 2021 FloodList
3 32 deaths 21 Aug 2021 22 Aug 2021 FloodList
4 1 deaths and 2200 displaced 29 Aug 2021 31 Aug 2021 FloodList
5 27 deaths and 60 displaced 01 Sep 2021 03 Sep 2021 FloodList
6 1 deaths and 600 displaced 01 Sep 2021 03 Sep 2021 FloodList
7 0 deaths 01 Sep 2021 03 Sep 2021 FloodList
8 1 deaths 01 Sep 2021 03 Sep 2021 FloodList
9 4 deaths and 4000 displaced 01 Sep 2021 03 Sep 2021 FloodList
10 16 deaths and 100 displaced 01 Sep 2021 03 Sep 2021 FloodList
11 1 deaths and 60 displaced 30 Aug 2021 01 Sep 2021 FloodList
12 0 deaths and 50 displaced 07 Sep 2021 09 Sep 2021 FloodList
13 0 deaths 13 Sep 2021 15 Sep 2021 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.