How long did the Mirninsky Ulus fire last?

According to the heat detections seen by satellite inside the perimeter, it burned from 16 July 2021 to 7 August 2021 (23 days). The perimeter dates it from 21 July 2021 to 7 August 2021.

How much area did it burn?

The perimeter GWIS (Copernicus) rebuilt from heat detections is 21,550 hectares (215.5 km²). It is an estimate: official national figures may differ.

Which municipalities burned?

The fire entered 2 municipalities: Mirninsky Ulus (20,243 ha, 0.1 %); Nyurbinsky Ulus (1,610 ha, 0.0 %).

What was the weather like?

During the fire the temperature reached 32.1 °C, humidity dropped to 25 % and gusts hit 56 km/h. The fire danger index (FWI) reached 31, 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.

RU · Russia · 2021-07-16 → 2021-08-07

Mirninsky Ulus fire, 16 July 2021 Mirninsky Ulus, Nyurbinsky Ulus

Out · last detection 7 Aug 2021, 06:17 UTC

The fire started on 16 July 2021 in Mirninsky Ulus, Russia, and satellites saw it burning for 23 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 21,550 hectares from heat detections, spread across 2 municipalities.

It is the 251th largest in Sakha Republic since 2016 (of 1422 with a page). Number 94 in Russia in 2021, of 581.

Compare with…

Suggestions: Mirninsky Ulus · 2019 Mirninsky Ulus · 2019 Mirninsky Ulus · 2021 Mirninsky Ulus · 2026

Burnt area: 21,550ha; GWIS perimeter (Copernicus)
Duration: 23days; 16 Jul 2021 – 7 Aug 2021
Municipalities hit: 2; districts
Started on: 16 Jul; 2021
Heat detections: 2,566; in a single hotspot: 380 MW
Danger at start: 26; High · FWI index
Average daily power: 1.5GW; detected power per day, on average

HOTSPOTS BY DAY 16 Jul7 Aug

Play back 7 Aug 2021

How it evolved, day by day

16 Jul 23 Jul 26 Jul 29 Jul 30 Jul 1 Aug 4 Aug 7 Aug

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

The weather it burned in

32°high

56km/h · peak gust

25%lowest humidity

It had gone 6 days without rain (1 mm or more) when it started. Rain came after the fire: 20.4 mm on 8 Aug.

This area had burned before

8% of the perimeter overlaps earlier fires recorded since 2016: 1,774 ha in 2019.

How big is it?

It burned the equivalent of 14% of the area of London (216 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 town

Mirninsky Ulus where it started

20,243 ha reached on 16 Jul

0.1 %
Nyurbinsky Ulus

1,610 ha reached on 25 Jul

0.0 %

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 2020

Built-up area< 0.1 ha

Residents< 20

Inside the perimeter there was no noticeable built-up land and almost nobody lived there (GHSL 2020, 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.

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)
16 Jul	24.5 °C	25 %	26 km/h	0.0 mm	High 26
17 Jul	26.3 °C	38 %	44 km/h	2.8 mm	Low 8
18 Jul	23.5 °C	51 %	45 km/h	2.6 mm	Low 6
19 Jul	24.4 °C	33 %	56 km/h	0.0 mm	Moderate 21
20 Jul	24.1 °C	40 %	14 km/h	0.0 mm	Moderate 17
21 Jul	25.8 °C	36 %	37 km/h	1.1 mm	Moderate 16
22 Jul	26.0 °C	28 %	29 km/h	0.0 mm	Moderate 20
23 Jul	26.2 °C	34 %	17 km/h	0.0 mm	High 22
24 Jul	26.3 °C	32 %	35 km/h	0.0 mm	High 24
25 Jul	31.2 °C	29 %	26 km/h	0.0 mm	High 26
26 Jul	32.1 °C	27 %	31 km/h	0.0 mm	High 29
27 Jul	31.8 °C	32 %	19 km/h	0.0 mm	High 29
28 Jul	29.1 °C	38 %	26 km/h	0.0 mm	High 28
29 Jul	25.6 °C	29 %	27 km/h	0.0 mm	High 29
30 Jul	23.4 °C	29 %	26 km/h	0.0 mm	High 28
31 Jul	23.4 °C	33 %	22 km/h	0.0 mm	High 26
1 Aug	23.3 °C	38 %	24 km/h	0.0 mm	High 25
2 Aug	27.2 °C	35 %	40 km/h	0.0 mm	High 30
3 Aug	26.4 °C	32 %	38 km/h	0.0 mm	High 30
4 Aug	25.4 °C	33 %	38 km/h	0.0 mm	High 30
5 Aug	25.7 °C	28 %	39 km/h	0.0 mm	High 31
6 Aug	19.8 °C	38 %	39 km/h	0.0 mm	High 28
7 Aug	20.1 °C	47 %	32 km/h	0.0 mm	High 23
8 Aug after	17.3 °C	67 %	23 km/h	20.4 mm	Very low 0

Before and after, from space

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

↔

Before · 9 Jul 2021

After · 14 Aug 2021

Before After

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

Detections table · 2,566Every 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

All fires in Russia ›

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 16 July 2021 to 7 August 2021 (23 days). The perimeter dates it from 21 July 2021 to 7 August 2021.
How much area did it burn?: The perimeter GWIS (Copernicus) rebuilt from heat detections is 21,550 hectares (215.5 km²). It is an estimate: official national figures may differ.
Which municipalities burned?: The fire entered 2 municipalities: Mirninsky Ulus (20,243 ha, 0.1 %); Nyurbinsky Ulus (1,610 ha, 0.0 %).
What was the weather like?: During the fire the temperature reached 32.1 °C, humidity dropped to 25 % and gusts hit 56 km/h. The fire danger index (FWI) reached 31, 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 · Emergency number and official warnings ›

Satellite cross-check

NASA FIRMS ↗
GWIS · Copernicus ↗

History of this page · 1 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.

25 October 2026 Start date: 21 July 2021 → 16 July 2021.

RSS Changes to this page

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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.

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What really happened?

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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 112.

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 21 July 2021 to 7 August 2021. 2,566 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 2020, 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 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.

Where it burned