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: 1101796
Deaths: 4
Displaced: 500
Region: East Bridgewater
Countries: United States
From - To 22 Dec - 28 Jan
Known identifiers for this event:


For more info on GDACS alert score click here.

Impact Assessement as of 30-01-2023

SENDAI Indicator A N Country Location Info
death 1 United States Jackson County
death 2 United States Elk Grove
death 1 United States Paso Robles
SENDAI Indicator B N Country Location Info
affected 10000 United States Montecito
affected 30000 United States Santa Cruz County
affected 1 United States Morrissey Boulevard
affected 300 United States Catalina State Park
displaced 500 United States Sacramento County
rescued 40 United States Sacramento County
rescued 6 United States Whatcom County
rescued 2 United States Chatsworth
rescued 12 United States Ventura
rescued 6 United States Bayamón
SENDAI Indicator C N Country Location Info
houses 20 United States Los Osos
houses 30 United States Santa Maria
houses 12 United States East Bridgewater

Satellite Observation

Satellite-based Flood extent provided by GLOFAS
Overall of the satellite-based flooded area from / to : 2022-12-15 / 2023-02-04  

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 59 deaths 22 Dec 2022 26 Dec 2022 GLOFAS
2 2 deaths and 500 displaced 31 Dec 2022 02 Jan 2023 GLOFAS
3 0 deaths 25 Dec 2022 01 Jan 2023 GLOFAS
4 1 deaths 08 Jan 2023 10 Jan 2023 GLOFAS
5 0 deaths 12 Jan 2023 13 Jan 2023 GLOFAS
6 0 deaths 20 Jan 2023 23 Jan 2023 GLOFAS
7 0 deaths 18 Jan 2023 19 Jan 2023 GLOFAS
8 0 deaths 27 Jan 2023 28 Jan 2023 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.