Burned area
satellite only12,947ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 21 May 2025 – 2 Jun 2025
+− cross-check
No official record is matched to this page to compare it with.
CA · Canada · –
Lynn Lake fire, 21 May 2025 Lynn Lake, Division No. 23, Unorganized
Out · last detection 2 Jun 2025, 09:01 UTC
The fire started on 21 May 2025 in Lynn Lake, Canada, and satellites saw it burning for 13 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 12,947 hectares from heat detections, spread across 2 municipalities.
Number 81 in Canada in 2025, of 667.
GWIS near-real-time perimeter (Canada, 2025-2026, until NBAC publishes its own): this fire is not compared with fires from earlier years.
Use this data
Fire page data · version 2026-10-25matches the official recordwith caveatssatellite onlymodel
When copying, the sentence is
Tick the figures you want: they make up the lede and the CSV.
Duration by satellite
satellite only13days
21 May 2025 to 2 Jun 2025: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 2 Jun 2025, 09:01 UTC
+− cross-check
Satellites pass a few times a day and cloud or smoke can hide the fire: a lack of detections is not an official extinction. Each country’s emergency service declares a fire contained or out.
Start
satellite only21 May 2025
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 21 May 2025
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only1,655
VIIRS detections at 375 m. Most intense hotspot: 587 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 21 May 2025 – 2 Jun 2025
+− cross-check
There is no official record to compare with. Each hotspot is a pixel detected in one satellite pass, not a separate fire.
The worst day
satellite only12,999MW
Total radiative power on 28 May 2025; hotspots that day: 277.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 28 May 2025
+− cross-check
Fire radiative power (FRP) measures the energy the fire gives off when the satellite passes. Added up by day, it compares intensity, not area.
Danger at the start
model9.1FWI · low
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 7.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 21 May 2025, local noon
- Model
- ERA5 0,25° (ECMWF · Copernicus C3S) · Open-Meteo.com
+− cross-check
This is an index computed from weather model data, not a measurement of the fire nor an official warning. Danger warnings are issued by each country’s authority. Emergency number and official warnings
Weather during the fire
model31.1°C · 16% RH
High of 31.1 °C and minimum humidity of 16% on 29 May 2025; gusts of 88 km/h on 2 June 2025.
- Source
- weather model at the fire’s grid cell
- Date
- 21 May 2025 – 2 Jun 2025
- Model
- ERA5 0,25° (ECMWF · Copernicus C3S) · Open-Meteo.com
+− cross-check
These are model values for a cell of about 25 km, not from a weather station: they may differ from what was measured on the ground.
Living inside
model≈ 200people
Estimated residents inside the perimeter and 1.6 ha of built-up area (100 m grid, epoch 2025).
- Source
- GHSL R2023A · JRC
- Date
- calculated on 24 October 2026
+− cross-check
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.
This page’s change log has been kept since 24 October 2026: every night what it publishes is compared and the difference is logged. Anything earlier is reconstructed from each source’s date and marked as reconstructed.
Show
-
logStart date: 25 May 2025 → 21 May 2025.
-
· reconstructed weatherWeather and FWI computed from the ERA5 reanalysis
-
· reconstructed GHSLPopulation and built-up area computed
What was saved on 25 October 2026
Every night a snapshot of what the page shows is saved. If anything changes, it appears in the list as a log entry.
- Area
- 12,947 ha
- Dates
- 21 May 2025 – 2 Jun 2025
- Name
- Lynn Lake
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/lynn-lake-2025-05?v=2026-10-25A version keeps the area, dates, name and official record; the area as it was logged (changes under 2% are not logged). The map, hotspots and weather always show today’s data.
Citation
A lede of about 60 words figures only, no adjectives
CSV for this fire lynn-lake-2025-05.csv · daily, no individual hotspots
| fecha | focos_viirs | frp_mw | tmax_c | tmin_c | hr_min_pct | viento_max_kmh | racha_max_kmh | precip_mm | fwi | clase_fwi | dentro_del_incendio |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025-05-21 | 26 | 188 | 14.4 | 4.3 | 31 | 17 | 33.1 | 0 | 9.1 | bajo | 1 |
| 2025-05-22 | 76 | 3,244 | 19.3 | 1.2 | 19 | 15.4 | 33.8 | 0 | 12.6 | moderado | 1 |
| 2025-05-23 | 58 | 379 | 20.4 | 3.6 | 16 | 15.5 | 33.1 | 0 | 15.5 | moderado | 1 |
| 2025-05-24 | 26 | 240 | 19.6 | 2.8 | 17 | 13 | 24.5 | 0 | 15.4 | moderado | 1 |
| 2025-05-25 | 20 | 229 | 22 | 4.7 | 18 | 15.4 | 31.7 | 0 | 17.6 | moderado | 1 |
| 2025-05-26 | 96 | 4,706 | 24.1 | 10.7 | 17 | 23.1 | 47.9 | 0 | 24 | alto | 1 |
| 2025-05-27 | 99 | 2,212 | 24.6 | 12.2 | 19 | 23 | 47.5 | 0 | 25.1 | alto | 1 |
| 2025-05-28 | 277 | 12,999 | 24.6 | 13.4 | 19 | 17 | 31.3 | 0 | 22.5 | alto | 1 |
| 2025-05-29 | 439 | 8,371 | 31.1 | 7.6 | 16 | 20.3 | 34.9 | 0 | 29 | alto | 1 |
| 2025-05-30 | 304 | 1,050 | 22.5 | 10.6 | 36 | 19.4 | 41.8 | 0.1 | 22 | alto | 1 |
| 2025-05-31 | 140 | 518 | 25.8 | 7.5 | 12 | 18.1 | 37.8 | 1.3 | 21.2 | moderado | 1 |
| 2025-06-01 | 0 | 0 | 20.7 | 11.3 | 42 | 32.4 | 68.8 | 3.5 | 7.4 | bajo | 1 |
| 2025-06-02 | 94 | 229 | 11.1 | 5.8 | 58 | 37.4 | 88.2 | 3.9 | 4 | muy_bajo | 1 |
| 2025-06-03 | 0 | 0 | 6.1 | 3.5 | 63 | 30.8 | 63.7 | 2 | 2.5 | muy_bajo | 0 |
It is generated in your browser from this page’s data: one file per fire, aggregated by day and without individual hotspots.
Live widget for your story
It updates itself while the fire is still active and links to this page. Free, with the attribution shown at the bottom.
Sources for this page: GWIS (Copernicus), NASA FIRMS (VIIRS), ERA5 (ECMWF/Copernicus C3S) · Open-Meteo.com (CC BY 4.0), GHSL (JRC). Open-Meteo.com · How we build fire pages: methodology
- Burnt area
- 12,947ha
- GWIS perimeter (Copernicus)
- Duration
- 13days
- 21 May 2025 – 2 Jun 2025
- Municipalities hit
- 2
- municipalities
- Started on
- 21 May
- 2025
- Heat detections
- 1,655
- in a single hotspot: 587 MW
- Danger at start
- 9
- Low · FWI index
- Average daily power
- 2.9GW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
21 May2 Jun
2 Jun 2025
How it evolved, day by day
21 May
24 May
28 May
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
31°high
88km/h · peak gust
12%lowest humidity
It had gone 7 days without rain (1 mm or more) when it started. Rain came after the fire: 2.0 mm on 3 Jun.
This area had burned before
No earlier perimeters overlap this fire since 2016, when the satellite record begins.
How big is it?
London boundary: geoBoundaries · Office for National Statistics (Open Government Licence v3.0).
Paris boundary: geoBoundaries · Institut national de l'information géographique et forestière (IGN-F) (Etalab Open License 2.0).
Madrid boundary: geoBoundaries · Open Data ESRI, IGN Central Registry of Cartography Area (CC BY 4.0).
Berlin boundary: geoBoundaries · Federal Agency for Cartography and Geodesy (dl-de/by-2-0).
This compares size, not location: both shapes are at the same scale, north up, centred on each other.
What happened to each town
-
Lynn Lake where it started12,898 ha reached on 21 May13 %
-
36 ha reached on 28 May0.0 %
Burnt area inside each municipality, from crossing the GWIS 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 2025Built-up area1.6 ha
Residents≈ 200
Inside the perimeter there were about 1.6 hectares of built-up land and about 200 residents (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) |
|---|---|---|---|---|---|
| 21 May | 14.4 °C | 31 % | 33 km/h | 0.0 mm | Low 9 |
| 22 May | 19.3 °C | 19 % | 34 km/h | 0.0 mm | Moderate 13 |
| 23 May | 20.4 °C | 16 % | 33 km/h | 0.0 mm | Moderate 16 |
| 24 May | 19.6 °C | 17 % | 24 km/h | 0.0 mm | Moderate 15 |
| 25 May | 22.0 °C | 18 % | 32 km/h | 0.0 mm | Moderate 18 |
| 26 May | 24.1 °C | 17 % | 48 km/h | 0.0 mm | High 24 |
| 27 May | 24.6 °C | 19 % | 48 km/h | 0.0 mm | High 25 |
| 28 May | 24.6 °C | 19 % | 31 km/h | 0.0 mm | High 22 |
| 29 May | 31.1 °C | 16 % | 35 km/h | 0.0 mm | High 29 |
| 30 May | 22.5 °C | 36 % | 42 km/h | 0.1 mm | High 22 |
| 31 May | 25.8 °C | 12 % | 38 km/h | 1.3 mm | Moderate 21 |
| 1 Jun | 20.7 °C | 42 % | 69 km/h | 3.5 mm | Low 7 |
| 2 Jun | 11.1 °C | 58 % | 88 km/h | 3.9 mm | Very low 4 |
| 3 Jun after | 6.1 °C | 63 % | 64 km/h | 2.0 mm | Very low 2 |
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
↔
Before · 14 May 2025
After · 9 Jun 2025
Sentinel-2 did not pass over on that day. Try another date, or use false colour, which is daily.
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 · CopernicusOn 1 June 2025 the air beside the fire reached 253 µg/m³ of PM2.5. That day averaged 101: 6.7 times the WHO daily guideline (15).
PM2.5 peak253 µg/m³
Days over the guideline11 days
PM10259 µg/m³
Optical depth3.24
WHO 15
19 May23 May27 May31 May4 Jun
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 · 1,655Every 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 time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
- 8,271 haDivision No. 23, Unorganized22 May 2025 · 12 days · 19 km away
- 9,073 haDivision No. 23, Unorganized26 June 2026 · 9 days · 23 km away
- 8,422 haDivision No. 23, Unorganized26 May 2025 · 11 days · 23 km away
- 5,239 haDivision No. 23, Unorganized23 June 2018 · 49 days · 24 km away
- 9,995 haDivision No. 23, Unorganized30 June 2025 · 11 days · 25 km away
- 6,190 haDivision No. 23, Unorganized1 August 2025 · 10 days · 32 km away
Frequently asked questions
- How long did the Lynn Lake fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 21 May 2025 to 2 June 2025 (13 days). The perimeter dates it from 25 May 2025 to 2 June 2025.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 12,947 hectares (129.5 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 2 municipalities: Lynn Lake (12,898 ha, 13 %); Division No. 23, Unorganized (36 ha, 0.0 %).
- What was the weather like?
- During the fire the temperature reached 31.1 °C, humidity dropped to 12 % and gusts hit 88 km/h. The fire danger index (FWI) reached 29, class High.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Canada (geoBoundaries). 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
- CIFFC · Canadian Interagency Forest Fire Centre ↗
- CWFIS · Canadian Wildland Fire Information System ↗
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.
- Start date: 25 May 2025 → 21 May 2025.
RSS Changes to this page With cross-checks and a citable version
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
How we know this
- Perimeter: GWIS (Copernicus), rebuilt from heat detections rather than mapped on imagery.
- Dates adjusted with the VIIRS detections inside the perimeter, which said 25 May 2025 to 2 June 2025. 1,655 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.
Where this data comes from
The perimeter comes from the Copernicus Global Wildfire Information System (GWIS), which rebuilds it from MODIS and VIIRS heat detections and publishes it under CC BY 4.0. It is not measured on imagery as in Europe, so it is an estimate. Heat detections come from the VIIRS sensors aboard Suomi-NPP and NOAA-20, distributed by NASA FIRMS at 375 m resolution. Municipal boundaries come from geoBoundaries ADM3 (Open Data Commons Open Database License 1.0). The area per municipality is computed by WorldFires by crossing the perimeter with those boundaries, so it may differ from each country’s official figure.