How long did the Kobyaysky Ulus fire last?

GWIS (Copernicus) dates it between 20 July 2021 and 31 July 2021: 12 days between the first and last heat detection of the perimeter.

How much area did it burn?

The perimeter GWIS (Copernicus) rebuilt from heat detections is 5,226 hectares (52.3 km²). It is an estimate: official national figures may differ.

Which municipalities burned?

The fire only entered Kobyaysky Ulus (5,153 ha, 0.0 %).

What was the weather like?

During the fire the temperature reached 30.1 °C, humidity dropped to 29 % and gusts hit 52 km/h. The fire danger index (FWI) reached 22, 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 · 2021-07-20 → 2021-07-31

Kobyaysky Ulus fire, 20 July 2021 Kobyaysky Ulus

Out · last detection 1 Aug 2021, 18:34 UTC

The fire started on 20 July 2021 in Kobyaysky Ulus, Russia, and satellites saw it burning for 12 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 5,226 hectares from heat detections, spread across a single municipality.

It is the 903th largest in Sakha Republic since 2016 (of 1422 with a page). Number 337 in Russia in 2021, of 581.

Compare with…

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

Burnt area: 5,226ha; GWIS perimeter (Copernicus)
Duration: 12days; 20 Jul 2021 – 31 Jul 2021
Municipalities hit: 1; districts
Started on: 20 Jul; 2021
Heat detections: 921; in a single hotspot: 76 MW
Danger at start: 11; Low · FWI index
Average daily power: 407MW; detected power per day, on average

Play back 1 Aug 2021

HOTSPOTS BY DAY 20 Jul31 Jul

How it evolved, day by day

20 Jul 23 Jul 25 Jul 27 Jul 28 Jul 29 Jul 31 Jul

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

The weather it burned in

30°high

52km/h · peak gust

29%lowest humidity

It had gone 10 days without rain (1 mm or more) when it started.

This area had burned before

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

How big is it?

It burned the equivalent of 3.3% of the area of London (52 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

5,153 ha

0.0 %

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	24.1 °C	47 %	17 km/h	0.0 mm	Low 11
21 Jul	20.3 °C	69 %	41 km/h	0.5 mm	Low 10
22 Jul	25.8 °C	47 %	22 km/h	0.0 mm	Low 11
23 Jul	25.9 °C	51 %	12 km/h	0.0 mm	Low 11
24 Jul	25.4 °C	51 %	35 km/h	0.0 mm	Moderate 14
25 Jul	23.6 °C	52 %	52 km/h	0.0 mm	Moderate 19
26 Jul	30.1 °C	37 %	24 km/h	0.0 mm	Moderate 18
27 Jul	23.2 °C	45 %	50 km/h	0.0 mm	High 22
28 Jul	24.4 °C	33 %	31 km/h	0.0 mm	Moderate 20
29 Jul	23.4 °C	36 %	24 km/h	0.0 mm	Moderate 19
30 Jul	25.9 °C	29 %	18 km/h	0.0 mm	Moderate 20
31 Jul	27.1 °C	35 %	29 km/h	0.0 mm	High 22
1 Aug after	27.8 °C	42 %	20 km/h	0.0 mm	Moderate 20
2 Aug after	29.8 °C	26 %	25 km/h	0.0 mm	High 24
3 Aug after	29.5 °C	22 %	23 km/h	0.0 mm	High 26
4 Aug after	27.2 °C	37 %	17 km/h	0.0 mm	High 24
5 Aug after	27.1 °C	30 %	23 km/h	0.0 mm	High 26
6 Aug after	23.6 °C	32 %	28 km/h	0.0 mm	High 26
7 Aug after	26.0 °C	30 %	64 km/h	0.0 mm	Very high 40
8 Aug after	24.3 °C	34 %	60 km/h	0.0 mm	High 37
9 Aug after	26.0 °C	30 %	43 km/h	0.0 mm	High 32
10 Aug after	27.0 °C	37 %	42 km/h	0.0 mm	High 30

Before and after, from space

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

↔

Before · 13 Jul 2021

After · 7 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 · 921Every 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?: GWIS (Copernicus) dates it between 20 July 2021 and 31 July 2021: 12 days between the first and last heat detection of the perimeter.
How much area did it burn?: The perimeter GWIS (Copernicus) rebuilt from heat detections is 5,226 hectares (52.3 km²). It is an estimate: official national figures may differ.
Which municipalities burned?: The fire only entered Kobyaysky Ulus (5,153 ha, 0.0 %).
What was the weather like?: During the fire the temperature reached 30.1 °C, humidity dropped to 29 % and gusts hit 52 km/h. The fire danger index (FWI) reached 22, 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

NASA FIRMS ↗
GWIS · Copernicus ↗

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 from the perimeter: the VIIRS detections inside it did not change them. 921 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.

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