Overall Green alert Flood
in Canada, 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: 1101174
Deaths: 1
Displaced: 12800
Region: Whatcom County, Kent, Squamish-Lillooet Regional District, Thompson-Nicola Regional District, Abbotsford
Countries: Canada, United States
From - To 12 Nov - 14 Nov
Known identifiers for this event:


For more info on GDACS alert score click here.

Impact Assessement as of 17-11-2021

SENDAI Indicator A N Country Location Info
death 1 Canada Squamish-Lillooet Regional District
missing 1 United States Whatcom County
SENDAI Indicator B N Country Location Info
affected 2 Canada Thompson-Nicola Regional District
displaced 5000 Canada Abbotsford
displaced 500 United States Whatcom County
displaced 300 United States Whatcom County
displaced 7000 Canada Thompson-Nicola Regional District
rescued 275 Canada Kent
SENDAI Indicator C N Country Location Info
houses damaged 300 United States Whatcom County

Satellite Observation


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 and 12800 displaced 12 Nov 2021 14 Nov 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.