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: 1101852
Deaths: 6
Displaced: 9460
Region: Fresno County, Monterey County, California, Watsonville
Countries: United States
From - To 08 Feb - 15 Mar
Known identifiers for this event:


For more info on GDACS alert score click here.

Impact Assessement as of 12-03-2023

SENDAI Indicator A N Country Location Info
death 1 United States Royse City
death 1 United States Scott County
death 2 United States California
death 2 United States Kane County
SENDAI Indicator B N Country Location Info
affected - United States Lincoln Court
displaced 60 United States Sedona
displaced 9400 United States California
rescued 1 United States Watsonville
rescued 12 United States Kane County
rescued 1 United States Mount Gay-Shamrock
rescued 1 United States Charleston
rescued 7 United States Southern California
rescued 4 United States Fresno County
rescued 56 United States Monterey County
SENDAI Indicator D N Country Location Info
roads 1 United States Root River Parkway

Satellite Observation

Satellite-based Flood extent provided by GLOFAS
Overall of the satellite-based flooded area from / to : 2023-02-01 / 2023-03-22  

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 1 deaths 08 Feb 2023 09 Feb 2023 GLOFAS
2 0 deaths 16 Feb 2023 18 Feb 2023 GLOFAS
3 0 deaths 24 Feb 2023 26 Feb 2023 GLOFAS
4 0 deaths 27 Feb 2023 01 Mar 2023 GLOFAS
5 1 deaths 03 Mar 2023 05 Mar 2023 GLOFAS
6 2 deaths and 9400 displaced 09 Mar 2023 11 Mar 2023 GLOFAS
7 2 deaths and 60 displaced 13 Mar 2023 15 Mar 2023 GLOFAS
8 0 deaths 10 Mar 2023 12 Mar 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.