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Peace River B fire, 23 June 2023 Peace River B

Out · last detection 3 Sept 2023, 11:44 UTC

The fire started on 23 June 2023 in Peace River B, Canada, and satellites saw it burning for 73 days. Canada’s CWFIS (Natural Resources Canada) mapped an official burnt perimeter of 4,157 hectares from satellite imagery, spread across a single census subdivision.

It is the 204th largest in British Columbia since 2016 (of 449 with a page). Number 296 in Canada in 2023, of 489.

Compare with…

Suggestions: Peace River B · 2018

Burnt area
4,157ha
official perimeter (CWFIS)
Duration
73days
23 Jun 2023 – 3 Sept 2023
Census subdivisions hit
1
municipalities
Started on
23 Jun
2023
Heat detections
433
in a single hotspot: 800 MW
Danger at start
1
Very low · FWI index
Average daily power
143MW
detected power per day, on average

Where it burned

HOTSPOTS BY DAY 23 Jun3 Sept
3 Sept 2023

How it evolved, day by day

24 Jun 2023 · 141 MW · 14 25 Jun 2023 · 689 MW · 34 26 Jun 2023 · 227 MW · 33 27 Jun 2023 · 282 MW · 46 28 Jun 2023 · 1,253 MW · 100 4 Jul 2023 · 47 MW · 11 5 Jul 2023 · 76 MW · 8 6 Jul 2023 · 306 MW · 23 7 Jul 2023 · 34 MW · 6 8 Jul 2023 · 20 MW · 6 9 Jul 2023 · 274 MW · 21 10 Jul 2023 · 12 MW · 8 11 Jul 2023 · 128 MW · 13 12 Jul 2023 · 112 MW · 32 13 Jul 2023 · 52 MW · 20 14 Jul 2023 · 138 MW · 21 15 Jul 2023 · 6 MW · 9 16 Jul 2023 · 5 MW · 1 24 Jul 2023 · 4 MW · 1 25 Jul 2023 · 11 MW · 3 25 Aug 2023 · 7 MW · 2 27 Aug 2023 · 3 MW · 4 28 Aug 2023 · 2 MW · 1 29 Aug 2023 · 3 MW · 2 1 Sept 2023 · 4 MW · 1 2 Sept 2023 · 25 MW · 12 3 Sept 2023 · 2 MW · 1
24 Jun 28 Jun 7 Jul 11 Jul 15 Jul 25 Aug 1 Sept

Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.

The weather it burned in

28°high
69km/h · peak gust
28%lowest humidity

It had gone 0 days without rain (1 mm or more) when it started. Rain came after the fire: 2.2 mm on 5 Sept.

This area had burned before

No earlier perimeters overlap this fire since 2016, when the satellite record begins.

How big is it?

10 km
It burned the equivalent of 2.6% of the area of London (42 km² against 1,583 km²).

London boundary: geoBoundaries · Office for National Statistics (Open Government Licence v3.0).

This compares size, not location: both shapes are at the same scale, north up, centred on each other.

What happened to each census subdivision

  1. Peace River B where it started
    4,247 ha reached on 24 Jun
    0.0 %

Burnt area inside each census subdivision, from crossing the official perimeter with administrative boundaries. The distance runs from the point marking the centre of each area to the nearest fire: staying a kilometre away does not mean it reached the houses.

People and buildings inside the perimeter

GHSL 2025
Built-up area< 0.1 ha
Residents< 20

Inside the perimeter there was no noticeable built-up land and almost nobody lived there (GHSL 2025, satellite-based estimate).

This is an estimate on 100 m cells, made from satellite imagery and census data: it does not mean that homes burned or that anyone was harmed. The perimeter also contains land that never burned. The GHSL 2025 epoch is a projection made from 2020 and earlier data.

Source: Global Human Settlement Layer (GHS-BUILT-S and GHS-POP R2023A), European Commission Joint Research Centre (JRC), © European Union, CC BY 4.0. Sum inside the perimeter computed by WorldFires. human-settlement.emergency.copernicus.eu

The weather day by day

ECMWF ERA5 reanalysis at the fire location, the standard reference for past weather, and the Canadian Fire Weather Index (the same system Copernicus uses), computed by WorldFires from that data. Days after the fire run until the first rain.

Open-Meteo.com (CC BY 4.0) · Copernicus Climate Change Service (ERA5)

Day High Min. humidity Peak gust Rain Danger (FWI)
23 Jun 25.0 °C 39 % 23 km/h 3.8 mm Very low 1
24 Jun 24.2 °C 47 % 32 km/h 12.3 mm Very low 0
25 Jun 23.4 °C 38 % 37 km/h 0.2 mm Very low 2
26 Jun 23.3 °C 50 % 32 km/h 2.9 mm Very low 1
27 Jun 24.5 °C 41 % 30 km/h 0.2 mm Very low 3
28 Jun 24.3 °C 43 % 34 km/h 2.2 mm Very low 1
29 Jun 19.2 °C 41 % 40 km/h 2.1 mm Very low 1
30 Jun 17.6 °C 45 % 56 km/h 1.2 mm Very low 2
1 Jul 17.0 °C 34 % 46 km/h 0.5 mm Low 6
2 Jul 14.8 °C 55 % 50 km/h 0.0 mm Low 6
3 Jul 21.2 °C 42 % 31 km/h 0.0 mm Low 7
4 Jul 23.4 °C 40 % 26 km/h 0.4 mm Low 9
5 Jul 26.7 °C 29 % 30 km/h 0.0 mm Moderate 13
6 Jul 21.6 °C 46 % 30 km/h 0.1 mm Low 11
7 Jul 24.6 °C 38 % 22 km/h 0.0 mm Moderate 12
8 Jul 26.7 °C 34 % 22 km/h 0.0 mm Moderate 13
9 Jul 25.8 °C 44 % 23 km/h 4.9 mm Very low 1
10 Jul 22.0 °C 57 % 21 km/h 4.5 mm Very low 0
11 Jul 20.2 °C 60 % 32 km/h 9.1 mm Very low 0
12 Jul 22.6 °C 47 % 23 km/h 0.5 mm Very low 1
13 Jul 25.0 °C 40 % 16 km/h 0.1 mm Very low 3
14 Jul 25.8 °C 39 % 22 km/h 2.5 mm Very low 1
15 Jul 20.2 °C 54 % 23 km/h 6.8 mm Very low 0
16 Jul 20.1 °C 58 % 23 km/h 4.0 mm Very low 0
17 Jul 16.2 °C 86 % 32 km/h 11.9 mm Very low 0
18 Jul 16.5 °C 77 % 33 km/h 10.7 mm Very low 0
19 Jul 21.8 °C 48 % 14 km/h 0.0 mm Very low 0
20 Jul 26.2 °C 39 % 27 km/h 1.5 mm Very low 0
21 Jul 25.3 °C 43 % 28 km/h 6.4 mm Very low 0
22 Jul 19.0 °C 67 % 36 km/h 9.3 mm Very low 0
23 Jul 19.1 °C 38 % 33 km/h 6.4 mm Very low 0
24 Jul 18.6 °C 44 % 27 km/h 0.3 mm Very low 0
25 Jul 21.2 °C 36 % 48 km/h 0.0 mm Very low 3
26 Jul 14.8 °C 60 % 38 km/h 4.0 mm Very low 0
27 Jul 19.8 °C 48 % 31 km/h 0.6 mm Very low 1
28 Jul 22.0 °C 43 % 24 km/h 0.0 mm Very low 2
29 Jul 24.5 °C 35 % 16 km/h 0.0 mm Low 5
30 Jul 22.6 °C 37 % 23 km/h 1.5 mm Very low 3
31 Jul 17.4 °C 77 % 22 km/h 9.7 mm Very low 0
1 Aug 16.2 °C 82 % 20 km/h 21.0 mm Very low 0
2 Aug 17.7 °C 62 % 20 km/h 5.2 mm Very low 0
3 Aug 20.9 °C 45 % 21 km/h 0.6 mm Very low 0
4 Aug 23.6 °C 40 % 19 km/h 0.2 mm Very low 1
5 Aug 25.8 °C 31 % 16 km/h 0.1 mm Very low 4
6 Aug 26.4 °C 34 % 20 km/h 0.6 mm Low 6
7 Aug 23.2 °C 56 % 27 km/h 11.5 mm Very low 0
8 Aug 18.4 °C 69 % 28 km/h 7.8 mm Very low 0
9 Aug 19.0 °C 55 % 34 km/h 3.6 mm Very low 0
10 Aug 19.1 °C 63 % 50 km/h 1.7 mm Very low 0
11 Aug 17.2 °C 62 % 30 km/h 3.7 mm Very low 0
12 Aug 16.4 °C 79 % 42 km/h 3.6 mm Very low 0
13 Aug 19.9 °C 55 % 56 km/h 0.5 mm Very low 0
14 Aug 19.7 °C 40 % 39 km/h 2.1 mm Very low 0
15 Aug 19.0 °C 56 % 61 km/h 6.2 mm Very low 0
16 Aug 20.2 °C 55 % 52 km/h 0.0 mm Very low 0
17 Aug 14.6 °C 54 % 50 km/h 0.9 mm Very low 1
18 Aug 14.8 °C 53 % 36 km/h 0.7 mm Very low 1
19 Aug 19.0 °C 45 % 27 km/h 0.0 mm Very low 2
20 Aug 19.9 °C 39 % 23 km/h 0.4 mm Very low 4
21 Aug 22.3 °C 33 % 29 km/h 0.0 mm Low 7
22 Aug 23.1 °C 28 % 21 km/h 0.0 mm Low 8
23 Aug 21.3 °C 40 % 20 km/h 0.0 mm Low 8
24 Aug 22.6 °C 40 % 20 km/h 0.3 mm Low 9
25 Aug 25.0 °C 35 % 32 km/h 0.0 mm Low 11
26 Aug 24.3 °C 44 % 30 km/h 0.0 mm Low 11
27 Aug 27.9 °C 42 % 24 km/h 0.0 mm Low 11
28 Aug 27.0 °C 43 % 27 km/h 0.0 mm Moderate 12
29 Aug 23.1 °C 39 % 20 km/h 0.0 mm Moderate 12
30 Aug 18.3 °C 65 % 31 km/h 4.1 mm Very low 1
31 Aug 17.7 °C 52 % 48 km/h 0.0 mm Very low 3
1 Sept 21.0 °C 45 % 69 km/h 0.0 mm Low 7
2 Sept 17.3 °C 34 % 56 km/h 0.0 mm Low 11
3 Sept 11.4 °C 55 % 46 km/h 2.8 mm Very low 1
4 Sept after 13.7 °C 37 % 22 km/h 0.0 mm Very low 2
5 Sept after 11.1 °C 55 % 19 km/h 2.2 mm Very low 1

Before and after, from space

Drag the line to compare the same ground before the fire and after it.

Before · 16 Jun 2023
After · 10 Sept 2023

If the day is cloudy, change the date: each satellite passes once a day. In false colour the burnt ground looks brown or red.

The smoke

CAMS · Copernicus

On 29 June 2023 the air beside the fire reached 91 µg/m³ of PM2.5. That day averaged 55: 3.7 times the WHO daily guideline (15).

PM2.5 peak91 µg/m³
Days over the guideline20 days
PM10131 µg/m³
Optical depth3.01
21222324252627282930123456789101112131415161718192021222324252627282930311234567891011121314151617181920212223242526272829303112345
Good Fair Moderate Poor Very poor Extremely poor

Particles from the Copernicus CAMS model at the centre of the perimeter; these are not measurements in each town. The pale bar is the worst hour, the solid one the daily average.

Open-Meteo.com (CC BY 4.0) · Copernicus Atmosphere Monitoring Service (CAMS)

Detections table · 433Every satellite heat detection, one by one, with time, satellite, power and coordinates.
⬇ Download CSV Times in UTC. Each detection is a 375 m pixel: a large fire yields hundreds per pass.
Date and timeSatelliteFRP (MW)LatLon

Other fires nearby

All fires in Canada ›

Frequently asked questions

How long did the Peace River B fire last?
According to the heat detections seen by satellite inside the perimeter, it burned from 23 June 2023 to 3 September 2023 (73 days). The perimeter dates it from 23 June 2023 to 2 September 2023.
How much area did it burn?
The official perimeter mapped by Canada’s CWFIS (Natural Resources Canada) is 4,157 hectares (41.6 km²). Other tallies, such as those of provincial agencies, may give slightly different figures.
Which census subdivisions burned?
The fire only entered Peace River B (4,247 ha, 0.0 %).
What was the weather like?
During the fire the temperature reached 27.9 °C, humidity dropped to 28 % and gusts hit 69 km/h. The fire danger index (FWI) reached 13, class Moderate.
Where does this data come from?
From the official burnt perimeter of Canada’s CWFIS (NBAC, Natural Resources Canada) or, for the current season and until NBAC publishes it, the one rebuilt by GWIS (Copernicus); from NASA FIRMS VIIRS hotspots; and from the administrative boundaries of Canada. It is not an official report.

Where to verify it

A satellite detection is not an official report. Final figures and the fire’s status are published by each country’s emergency service.

Emergency number: 911 · Emergency number and official warnings ›

Satellite cross-check

History of this page · 1 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
  1. Last day with fire: 2 September 2023 → 3 September 2023.

RSS Changes to this page

Does something look wrong on this page?

This page is built from satellite data and official records, and it sometimes gets things wrong: the wrong dates, the wrong town, two fires merged into one, or something that was not a wildfire at all. If you know this fire first-hand (you live nearby, saw it, fought it or reported on it), tell us what really happened and we will check it.

Report an error
What do you think is wrong?

We will only use your email to reply about this report. Privacy. This is not an emergency service: if there is a fire now, call 911.

How we know this
  • Perimeter: NBAC (Natural Resources Canada), official.
  • Dates adjusted with the VIIRS detections inside the perimeter, which said 23 June 2023 to 2 September 2023. 433 Suomi-NPP VIIRS detections on those dates.
  • We have not matched this page with any official record.
  • Weather: Copernicus ERA5 reanalysis at the fire location, in cells of about 25 km.
  • Built-up area and population come from the JRC Global Human Settlement Layer (epoch 2025, 100 m cells), summed inside the perimeter: an estimate of what was there, not a damage count.

How we build fire pages: methodology ›

Where this data comes from

The perimeter is official: it comes from the National Burned Area Composite (NBAC) of the Canadian Wildland Fire Information System (CWFIS), Natural Resources Canada, which maps it on satellite imagery and publishes it under the Open Government Licence – Canada. Until NBAC publishes the current season, this year’s fires carry the perimeter rebuilt from heat detections by GWIS (Copernicus, CC BY 4.0), which is approximate. Heat detections come from the VIIRS sensors aboard Suomi-NPP and NOAA-20, distributed by NASA FIRMS at 375 m resolution. Census subdivision boundaries come from geoBoundaries ADM3 (Open Data Commons Open Database License 1.0). The area per census subdivision is computed by WorldFires by crossing the perimeter with those boundaries, so it may differ slightly from official figures.