Mirninsky Ulus fire, 17 July 2026 Mirninsky Ulus, Katangsky Rayon
The fire started on 17 July 2026 in Mirninsky Ulus, Russia, and satellites saw it burning for 59 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 586,597 hectares from heat detections, spread across 2 municipalities.
This page is probably a fire complex, not a single fire. GWIS merges into one perimeter the fires that touch over weeks, which in large burning seasons can join dozens of separate fires. The total area is reliable; the origin and dates refer to the whole complex.
It is the 2th largest in Sakha Republic since 2016 (of 1422 with a page). The largest in Russia in 2026, of 418.
- Burnt area
- 586,597ha
- GWIS perimeter (Copernicus)
- Duration
- 59days
- 17 Jul 2026 – 13 Sept 2026
- Municipalities hit
- 2
- districts
- Started on
- 17 Jul
- 2026
- Heat detections
- 77,918
- in a single hotspot: 834 MW
- Danger at start
- 15
- Moderate · FWI index
- Energy released
- 885.2GW
- sum of detected power
Where it burned
How it evolved, day by day
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
It had gone 4 days without rain (1 mm or more) when it started. Rain came after the fire: 1.2 mm on 7 Sept.
This area had burned before
2% of the perimeter overlaps earlier fires recorded since 2016: 452 ha in 2017, 2,283 ha in 2018, 1,754 ha in 2019, 8,261 ha in 2020, 211 ha in 2022.
- 2,012 ha Mirninsky Ulus fire, June 2020 11,205 ha in total; the hectares shown are those it shares with this fire
- 1,754 ha Mirninsky Ulus fire, August 2019 32,259 ha in total; the hectares shown are those it shares with this fire
- 1,726 ha Mirninsky Ulus fire, August 2020 8,982 ha in total; the hectares shown are those it shares with this fire
- 1,403 ha Mirninsky Ulus fire, June 2020 10,288 ha in total; the hectares shown are those it shares with this fire
- 1,261 ha Mirninsky Ulus fire, June 2018 10,447 ha in total; the hectares shown are those it shares with this fire
- 1,091 ha Mirninsky Ulus fire, August 2020 46,856 ha in total; the hectares shown are those it shares with this fire
- 688 ha Mirninsky Ulus fire, August 2020 11,548 ha in total; the hectares shown are those it shares with this fire
- 503 ha Mirninsky Ulus fire, August 2020 3,136 ha in total; the hectares shown are those it shares with this fire
What happened to each town
-
Mirninsky Ulus where it started599,452 ha reached on 17 Jul3.6 %
-
4,810 ha reached on 5 Aug0.0 %
Burnt area inside each municipality, from crossing the GWIS perimeter with administrative boundaries. The distance is from the town centre to the nearest fire: staying a kilometre away does not mean it reached the houses.
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) |
|---|---|---|---|---|---|
| 20 Jul | 21.4 °C | 34 % | 24 km/h | 0.2 mm | Moderate 15 |
| 21 Jul | 22.9 °C | 34 % | 26 km/h | 0.0 mm | Moderate 17 |
| 22 Jul | 23.2 °C | 22 % | 17 km/h | 0.0 mm | Moderate 17 |
| 23 Jul | 24.4 °C | 37 % | 18 km/h | 0.0 mm | Moderate 18 |
| 24 Jul | 24.6 °C | 42 % | 20 km/h | 0.6 mm | Moderate 14 |
| 25 Jul | 24.8 °C | 37 % | 27 km/h | 1.8 mm | Moderate 11 |
| 26 Jul | 23.2 °C | 24 % | 17 km/h | 0.0 mm | Moderate 17 |
| 27 Jul | 27.9 °C | 30 % | 14 km/h | 0.0 mm | Moderate 18 |
| 28 Jul | 30.9 °C | 23 % | 23 km/h | 0.0 mm | Moderate 20 |
| 29 Jul | 30.0 °C | 26 % | 23 km/h | 0.0 mm | Moderate 20 |
| 30 Jul | 31.1 °C | 21 % | 28 km/h | 0.0 mm | High 24 |
| 31 Jul | 30.9 °C | 24 % | 17 km/h | 0.0 mm | High 22 |
| 1 Aug | 31.1 °C | 25 % | 20 km/h | 0.1 mm | High 23 |
| 2 Aug | 29.0 °C | 29 % | 34 km/h | 0.2 mm | High 27 |
| 3 Aug | 17.8 °C | 41 % | 43 km/h | 0.4 mm | High 23 |
| 4 Aug | 15.3 °C | 35 % | 28 km/h | 0.0 mm | Moderate 19 |
| 5 Aug | 20.5 °C | 29 % | 23 km/h | 0.0 mm | Moderate 18 |
| 6 Aug | 22.8 °C | 29 % | 38 km/h | 0.0 mm | High 23 |
| 7 Aug | 23.4 °C | 31 % | 42 km/h | 0.9 mm | Moderate 20 |
| 8 Aug | 23.6 °C | 50 % | 24 km/h | 0.5 mm | Moderate 15 |
| 9 Aug | 20.0 °C | 40 % | 37 km/h | 0.0 mm | Moderate 19 |
| 10 Aug | 18.9 °C | 36 % | 24 km/h | 0.0 mm | Moderate 17 |
| 11 Aug | 17.5 °C | 36 % | 34 km/h | 0.0 mm | Moderate 20 |
| 12 Aug | 18.2 °C | 32 % | 14 km/h | 0.0 mm | Moderate 16 |
| 13 Aug | 17.9 °C | 34 % | 29 km/h | 0.0 mm | Moderate 20 |
| 14 Aug | 14.7 °C | 50 % | 30 km/h | 0.3 mm | Moderate 18 |
| 15 Aug | 12.7 °C | 49 % | 32 km/h | 0.0 mm | Moderate 17 |
| 16 Aug | 15.8 °C | 60 % | 34 km/h | 0.5 mm | Moderate 15 |
| 17 Aug | 19.0 °C | 54 % | 39 km/h | 1.6 mm | Low 7 |
| 18 Aug | 15.8 °C | 51 % | 28 km/h | 0.5 mm | Low 10 |
| 19 Aug | 14.4 °C | 43 % | 26 km/h | 0.0 mm | Moderate 12 |
| 20 Aug | 18.0 °C | 35 % | 17 km/h | 0.0 mm | Moderate 14 |
| 21 Aug | 19.5 °C | 28 % | 16 km/h | 0.0 mm | Moderate 18 |
| 22 Aug | 18.7 °C | 38 % | 23 km/h | 0.0 mm | Moderate 20 |
| 23 Aug | 19.3 °C | 28 % | 13 km/h | 0.0 mm | Moderate 19 |
| 24 Aug | 20.6 °C | 27 % | 20 km/h | 0.0 mm | High 22 |
| 25 Aug | 20.9 °C | 30 % | 22 km/h | 0.0 mm | High 23 |
| 26 Aug | 21.2 °C | 30 % | 24 km/h | 0.0 mm | High 24 |
| 27 Aug | 20.8 °C | 28 % | 19 km/h | 0.0 mm | High 22 |
| 28 Aug | 20.2 °C | 36 % | 18 km/h | 0.0 mm | High 22 |
| 29 Aug | 22.0 °C | 37 % | 30 km/h | 0.0 mm | High 26 |
| 30 Aug | 20.1 °C | 43 % | 32 km/h | 2.2 mm | Low 8 |
| 31 Aug | 22.0 °C | 43 % | 38 km/h | 0.1 mm | Moderate 16 |
| 1 Sept | 24.3 °C | 36 % | 36 km/h | 0.0 mm | High 23 |
| 2 Sept | 17.6 °C | 43 % | 34 km/h | 5.9 mm | Very low 3 |
| 3 Sept | 13.5 °C | 36 % | 38 km/h | 0.0 mm | Low 7 |
| 4 Sept | 11.9 °C | 42 % | 31 km/h | 0.0 mm | Low 10 |
| 5 Sept | 9.4 °C | 58 % | 27 km/h | 0.6 mm | Low 8 |
| 6 Sept | 13.4 °C | 41 % | 42 km/h | 0.9 mm | Low 10 |
| 7 Sept | 13.1 °C | 65 % | 31 km/h | 1.2 mm | Low 5 |
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
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 24 August 2026 the air beside the fire reached 3,159 µg/m³ of PM2.5. That day averaged 1,820: 121 times the WHO daily guideline (15).
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 · 77,918Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
Frequently asked questions
- How long did the Mirninsky Ulus fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 17 July 2026 to 13 September 2026 (59 days). The perimeter dates it from 20 July 2026 to 6 September 2026.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 586,597 hectares (5,866.0 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 2 municipalities: Mirninsky Ulus (599,452 ha, 3.6 %); Katangsky Rayon (4,810 ha, 0.0 %).
- What was the weather like?
- During the fire the temperature reached 31.1 °C, humidity dropped to 21 % and gusts hit 43 km/h. The fire danger index (FWI) reached 27, class High.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Russia (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: 112
Satellite cross-check
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
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 ADM2 (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.