How long did the Kobyaysky Ulus fire last?

According to the heat detections seen by satellite inside the perimeter, it burned from 16 July 2021 to 12 August 2021 (28 days). The perimeter dates it from 22 July 2021 to 12 August 2021.

How much area did it burn?

The perimeter GWIS (Copernicus) rebuilt from heat detections is 12,982 hectares (129.8 km²). It is an estimate: official national figures may differ.

Which municipalities burned?

The fire only entered Kobyaysky Ulus (12,800 ha, 0.1 %).

What was the weather like?

During the fire the temperature reached 29.2 °C, humidity dropped to 21 % and gusts hit 66 km/h. The fire danger index (FWI) reached 38, class Very 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 → 2021-08-12

Kobyaysky Ulus fire, 16 July 2021 Kobyaysky Ulus

Out · last detection 10 Aug 2021, 03:39 UTC

The fire started on 16 July 2021 in Kobyaysky Ulus, Russia, and satellites saw it burning for 28 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 12,982 hectares from heat detections, spread across a single municipality.

It is the 397th largest in Sakha Republic since 2016 (of 1422 with a page). Number 133 in Russia in 2021, of 581.

Compare with…

Suggestions: Kobyaysky Ulus · 2021 Kobyaysky Ulus · 2021 Kobyaysky Ulus · 2021

Burnt area: 12,982ha; GWIS perimeter (Copernicus)
Duration: 28days; 16 Jul 2021 – 12 Aug 2021
Municipalities hit: 1; districts
Started on: 16 Jul; 2021
Heat detections: 3,006; in a single hotspot: 161 MW
Danger at start: 12; Moderate · FWI index
Average daily power: 973MW; detected power per day, on average

HOTSPOTS BY DAY 16 Jul12 Aug

Play back 10 Aug 2021

How it evolved, day by day

16 Jul 20 Jul 25 Jul 29 Jul 30 Jul 2 Aug 6 Aug 10 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

29°high

66km/h · peak gust

21%lowest humidity

It had gone 6 days without rain (1 mm or more) when it started. Rain came after the fire: 12.7 mm on 15 Aug.

This area had burned before

1% of the perimeter overlaps earlier fires recorded since 2016: 66 ha in 2018.

How big is it?

It burned the equivalent of 8.2% of the area of London (130 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

Kobyaysky Ulus where it started

12,800 ha reached on 16 Jul

0.1 %

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	21.3 °C	42 %	42 km/h	0.0 mm	Moderate 12
17 Jul	26.5 °C	35 %	35 km/h	0.0 mm	Moderate 15
18 Jul	23.0 °C	46 %	31 km/h	0.0 mm	Moderate 14
19 Jul	25.2 °C	52 %	46 km/h	1.3 mm	Low 8
20 Jul	23.3 °C	47 %	19 km/h	0.0 mm	Low 9
21 Jul	19.1 °C	73 %	40 km/h	0.7 mm	Low 7
22 Jul	24.8 °C	49 %	23 km/h	0.0 mm	Low 9
23 Jul	25.2 °C	50 %	13 km/h	0.0 mm	Low 10
24 Jul	24.6 °C	54 %	34 km/h	0.0 mm	Moderate 13
25 Jul	23.1 °C	52 %	50 km/h	0.0 mm	Moderate 16
26 Jul	28.9 °C	39 %	26 km/h	0.0 mm	Moderate 16
27 Jul	22.7 °C	46 %	50 km/h	0.0 mm	Moderate 20
28 Jul	23.5 °C	34 %	30 km/h	0.0 mm	Moderate 18
29 Jul	22.8 °C	36 %	22 km/h	0.0 mm	Moderate 17
30 Jul	25.0 °C	29 %	20 km/h	0.0 mm	Moderate 19
31 Jul	26.4 °C	36 %	29 km/h	0.0 mm	Moderate 21
1 Aug	27.2 °C	42 %	20 km/h	0.0 mm	Moderate 20
2 Aug	29.2 °C	26 %	24 km/h	0.0 mm	High 23
3 Aug	28.7 °C	21 %	23 km/h	0.0 mm	High 26
4 Aug	26.4 °C	38 %	19 km/h	0.0 mm	High 23
5 Aug	26.2 °C	30 %	24 km/h	0.0 mm	High 24
6 Aug	22.8 °C	32 %	28 km/h	0.0 mm	High 25
7 Aug	25.2 °C	30 %	66 km/h	0.0 mm	Very high 38
8 Aug	23.4 °C	34 %	61 km/h	0.0 mm	High 36
9 Aug	25.2 °C	29 %	44 km/h	0.0 mm	High 30
10 Aug	26.0 °C	36 %	43 km/h	0.0 mm	High 30
11 Aug	21.7 °C	45 %	31 km/h	1.0 mm	Moderate 15
12 Aug	23.0 °C	55 %	22 km/h	0.2 mm	Moderate 13
13 Aug after	21.8 °C	59 %	14 km/h	0.0 mm	Moderate 13
14 Aug after	21.0 °C	63 %	23 km/h	0.4 mm	Moderate 14
15 Aug after	15.6 °C	90 %	23 km/h	12.7 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 · 19 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 · 3,006Every 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 Kobyaysky Ulus fire last?: According to the heat detections seen by satellite inside the perimeter, it burned from 16 July 2021 to 12 August 2021 (28 days). The perimeter dates it from 22 July 2021 to 12 August 2021.
How much area did it burn?: The perimeter GWIS (Copernicus) rebuilt from heat detections is 12,982 hectares (129.8 km²). It is an estimate: official national figures may differ.
Which municipalities burned?: The fire only entered Kobyaysky Ulus (12,800 ha, 0.1 %).
What was the weather like?: During the fire the temperature reached 29.2 °C, humidity dropped to 21 % and gusts hit 66 km/h. The fire danger index (FWI) reached 38, class Very 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: 22 July 2021 → 16 July 2021.

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.

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What do you think is wrong?

Dates or duration Place or towns Burned area Name It was not a wildfire Same fire as another page Something else

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 22 July 2021 to 12 August 2021. 3,006 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