Burned area
satellite only3,990ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 7 Jul 2021 – 20 Jul 2021
+− cross-check
No official record is matched to this page to compare it with.
RU · Russia · –
Oymyakonsky Ulus fire, 7 July 2021 Oymyakonsky Ulus
Out · last detection 20 Jul 2021, 15:38 UTC
The fire started on 7 July 2021 in Oymyakonsky Ulus, Russia, and satellites saw it burning for 14 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 3,990 hectares from heat detections, spread across a single municipality.
It is the 1067th largest in Sakha Republic since 2016 (of 1347 with a page). Number 439 in Russia in 2021, of 581.
Use this data
Compare with…
Use this data
Fire page data · version 2026-10-24matches 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 only14days
7 Jul 2021 to 20 Jul 2021: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 20 Jul 2021, 15:38 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 only7 Jul 2021
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 7 Jul 2021
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only492
VIIRS detections at 375 m. Most intense hotspot: 131 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 7 Jul 2021 – 20 Jul 2021
+− 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 only974MW
Total radiative power on 18 July 2021; hotspots that day: 80.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 18 Jul 2021
+− 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
model20.4FWI · moderate
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 1.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 7 Jul 2021, 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
model28.3°C · 17% RH
High of 28.3 °C and minimum humidity of 17% on 20 July 2021; gusts of 48 km/h on 15 July 2021.
- Source
- weather model at the fire’s grid cell
- Date
- 7 Jul 2021 – 20 Jul 2021
- 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.
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
-
· reconstructed GHSLPopulation and built-up area computed
-
· reconstructed weatherWeather and FWI computed from the ERA5 reanalysis
What was saved on 24 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
- 3,990 ha
- Dates
- 7 Jul 2021 – 20 Jul 2021
- Name
- Oymyakonsky Ulus
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/oymyakonsky-ulus-2021-07?v=2026-10-24A 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 oymyakonsky-ulus-2021-07.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021-07-07 | 3 | 3 | 23.8 | 14.2 | 43 | 7.9 | 19.4 | 0.3 | 20.4 | moderado | 1 |
| 2021-07-08 | 0 | 0 | 25.5 | 14 | 39 | 8.7 | 20.9 | 0.3 | 21.2 | moderado | 1 |
| 2021-07-09 | 9 | 25 | 27.3 | 13.8 | 32 | 14.2 | 32.4 | 0.1 | 26.9 | alto | 1 |
| 2021-07-10 | 3 | 24 | 27.3 | 12.4 | 36 | 10.5 | 27.4 | 0 | 24.8 | alto | 1 |
| 2021-07-11 | 9 | 80 | 28.1 | 15.9 | 27 | 14.6 | 37.8 | 1 | 25.5 | alto | 1 |
| 2021-07-12 | 49 | 600 | 17.2 | 12.5 | 39 | 20.6 | 47.2 | 3.4 | 7.1 | bajo | 1 |
| 2021-07-13 | 14 | 93 | 19.5 | 8.2 | 37 | 8.9 | 24.8 | 0.1 | 9.8 | bajo | 1 |
| 2021-07-14 | 101 | 435 | 22.9 | 7.5 | 24 | 17.9 | 40.3 | 0 | 26 | alto | 1 |
| 2021-07-15 | 33 | 759 | 24.2 | 9.9 | 30 | 21.3 | 47.9 | 0 | 30.3 | alto | 1 |
| 2021-07-16 | 0 | 0 | 22.4 | 12.9 | 35 | 7.6 | 20.5 | 0 | 21.7 | alto | 1 |
| 2021-07-17 | 45 | 222 | 25.4 | 12.2 | 29 | 13.6 | 32.4 | 0 | 26.6 | alto | 1 |
| 2021-07-18 | 80 | 974 | 21.5 | 11.2 | 33 | 20.4 | 47.2 | 0 | 32 | alto | 1 |
| 2021-07-19 | 74 | 550 | 26.2 | 4.8 | 18 | 7.8 | 16.9 | 0 | 28.5 | alto | 1 |
| 2021-07-20 | 72 | 546 | 28.3 | 11.1 | 17 | 19.5 | 45.4 | 0 | 41.6 | muy_alto | 1 |
| 2021-07-21 | 0 | 0 | 25.4 | 13.3 | 28 | 7.9 | 26.3 | 0 | 29.5 | alto | 0 |
| 2021-07-22 | 0 | 0 | 18.6 | 14.2 | 69 | 11.3 | 23.4 | 17.1 | 0.1 | 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
- 3,990ha
- GWIS perimeter (Copernicus)
- Duration
- 14days
- 7 Jul 2021 – 20 Jul 2021
- Municipalities hit
- 1
- districts
- Started on
- 7 Jul
- 2021
- Heat detections
- 492
- in a single hotspot: 131 MW
- Danger at start
- 20
- Moderate · FWI index
- Average daily power
- 359MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
7 Jul20 Jul
20 Jul 2021
How it evolved, day by day
7 Jul
11 Jul
14 Jul
18 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
28°high
48km/h · peak gust
17%lowest humidity
It had gone one day without rain (1 mm or more) when it started. Rain came after the fire: 17.1 mm on 22 Jul.
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).
Moscow boundary: geoBoundaries · OpenStreetMap, Wambacher · © OpenStreetMap contributors (ODbL 1.0).
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).
This compares size, not location: both shapes are at the same scale, north up, centred on each other.
What happened to each town
-
Oymyakonsky Ulus where it started3,945 ha reached on 7 Jul0.0 %
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 2020Built-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) |
|---|---|---|---|---|---|
| 7 Jul | 23.8 °C | 43 % | 19 km/h | 0.3 mm | Moderate 20 |
| 8 Jul | 25.5 °C | 39 % | 21 km/h | 0.3 mm | Moderate 21 |
| 9 Jul | 27.3 °C | 32 % | 32 km/h | 0.1 mm | High 27 |
| 10 Jul | 27.3 °C | 36 % | 27 km/h | 0.0 mm | High 25 |
| 11 Jul | 28.1 °C | 27 % | 38 km/h | 1.0 mm | High 26 |
| 12 Jul | 17.2 °C | 39 % | 47 km/h | 3.4 mm | Low 7 |
| 13 Jul | 19.5 °C | 37 % | 25 km/h | 0.1 mm | Low 10 |
| 14 Jul | 22.9 °C | 24 % | 40 km/h | 0.0 mm | High 26 |
| 15 Jul | 24.2 °C | 30 % | 48 km/h | 0.0 mm | High 30 |
| 16 Jul | 22.4 °C | 35 % | 20 km/h | 0.0 mm | High 22 |
| 17 Jul | 25.4 °C | 29 % | 32 km/h | 0.0 mm | High 27 |
| 18 Jul | 21.5 °C | 33 % | 47 km/h | 0.0 mm | High 32 |
| 19 Jul | 26.2 °C | 18 % | 17 km/h | 0.0 mm | High 28 |
| 20 Jul | 28.3 °C | 17 % | 45 km/h | 0.0 mm | Very high 42 |
| 21 Jul after | 25.4 °C | 28 % | 26 km/h | 0.0 mm | High 30 |
| 22 Jul after | 18.6 °C | 69 % | 23 km/h | 17.1 mm | Very low 0 |
Its twins: fires that started in the same weather
It started with an FWI of 20.4, a minimum humidity of 43% and 1 day without rain. Fires in the area that started in weather like this since 2019: 6.
FWI at the start
20.4
Minimum humidity
43 %
Days without rain
1
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Oymyakonsky Ulus fire, 7 July 2021
3,990 ha
14 days
FWI 20.4
Min. humidity 43 %
Oymyakonsky Ulus fire, July 2020
7,279 ha
20 days
FWI 14.2
Min. humidity 43 %
126 km away, in 2020
First rain (1 mm or more) after it ended: 13.3 mm on 11 Aug.
Oymyakonsky Ulus fire, July 2020
3,537 ha
18 days
FWI 21.0
Min. humidity 36 %
105 km away, in 2020
First rain (1 mm or more) after it ended: 12.3 mm on 11 Aug.
Oymyakonsky Ulus fire, July 2023
4,984 ha
14 days
FWI 9.0
Min. humidity 44 %
88 km away, in 2023
First rain (1 mm or more) after it ended: 5.7 mm on 15 Jul.
Oymyakonsky Ulus fire, July 2020
12,248 ha
21 days
FWI 15.8
Min. humidity 36 %
107 km away, in 2020
First rain (1 mm or more) after it ended: 10.0 mm on 11 Aug.
Oymyakonsky Ulus fire, August 2021
7,519 ha
10 days
FWI 10.0
Min. humidity 43 %
154 km away, in 2021
First rain (1 mm or more) after it ended: 8.5 mm on 17 Aug.
What happened to them
Fires in the area that started in similar weather: 6. With fewer than 15 we give no figures: they would be more noise than signal.
This is a bank of analogues: it shows what usually happens, not what will happen. With fewer than 15 twins we give no figures. How we calculate it
How it ended
17.1 mmfirst rain
22 Jul2 days after it ended
48km/h · max. gust
It was considered over on 20 Jul, and on 22 Jul 17.1 mm fell. We do not know whether the rain or the firefighters put it out.
Weather on this page: Open-Meteo.com (CC BY 4.0) · Copernicus Climate Change Service (ERA5)
How a twin is chosen
- Same area: fires that have already ended, less than 250 km from this one, since 2019.
- Same start: we compare the FWI on the first day, the minimum humidity that day and the run of days without rain before it. The slider sets how much they may differ.
- Only pages with final weather data (ERA5 reanalysis) calculated in the same way as this fire’s; agricultural and grass burns and pages with data under review are left out.
- Fires burning at the same time as this one (a week before or after) are left out: they share the same spell of weather and do not count as a precedent.
- They are sorted by similarity, and the outlines of the first five are drawn.
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
↔
Before · 30 Jun 2021
After · 27 Jul 2021
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.
Detections table · 492Every 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
Frequently asked questions
- How long did the Oymyakonsky Ulus fire last?
- GWIS (Copernicus) dates it between 7 July 2021 and 20 July 2021: 14 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 3,990 hectares (39.9 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Oymyakonsky Ulus (3,945 ha, 0.0 %).
- What was the weather like?
- During the fire the temperature reached 28.3 °C, humidity dropped to 17 % and gusts hit 48 km/h. The fire danger index (FWI) reached 42, 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
History of this page Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
No changes since 24 October 2026.
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 from the perimeter: the VIIRS detections inside it did not change them. 492 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.
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.