Burned area
satellite only10,406ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 25 Jul 2022 – 15 Aug 2022
+− cross-check
No official record is matched to this page to compare it with.
RU · Russia · –
Ust-Maysky Ulus fire, 25 July 2022 Ust-Maysky Ulus
Out · last detection 15 Aug 2022, 18:29 UTC
The fire started on 25 July 2022 in Ust-Maysky Ulus, Russia, and satellites saw it burning for 22 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 10,406 hectares from heat detections, spread across a single municipality.
It is the 452th largest in Sakha Republic since 2016 (of 1347 with a page). Number 83 in Russia in 2022, of 400.
Use this data
Compare with…
Use this data
Fire page data · version 2026-11-05matches 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 only22days
25 Jul 2022 to 15 Aug 2022: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 15 Aug 2022, 18:29 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 only25 Jul 2022
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 25 Jul 2022
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only1,500
VIIRS detections at 375 m. Most intense hotspot: 103 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP + NOAA-20)
- Date
- 25 Jul 2022 – 15 Aug 2022
+− 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 only2,734MW
Total radiative power on 6 August 2022; hotspots that day: 250.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 6 Aug 2022
+− 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
model11.4FWI · 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
- 25 Jul 2022, 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
model32.3°C · 33% RH
High of 32.3 °C and minimum humidity of 33% on 29 July 2022; gusts of 59 km/h on 6 August 2022.
- Source
- weather model at the fire’s grid cell
- Date
- 25 Jul 2022 – 15 Aug 2022
- 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
-
logLast day with fire: 8 August 2022 → 15 August 2022.
-
· reconstructed weatherWeather and FWI computed from the ERA5 reanalysis
-
· reconstructed GHSLPopulation and built-up area computed
What was saved on 5 November 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
- 10,406 ha
- Dates
- 25 Jul 2022 – 15 Aug 2022
- Name
- Ust-Maysky Ulus
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/ust-maysky-ulus-2022-07-10?v=2026-11-05A 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 ust-maysky-ulus-2022-07-10.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2022-07-25 | 19 | 41 | 26 | 15 | 45 | 15.3 | 39.2 | 0 | 11.4 | moderado | 1 |
| 2022-07-26 | 51 | 332 | 27.1 | 14 | 34 | 13.7 | 27.4 | 0 | 12.7 | moderado | 1 |
| 2022-07-27 | 83 | 500 | 29.8 | 11.8 | 37 | 8.6 | 22.3 | 0 | 17.6 | moderado | 1 |
| 2022-07-28 | 242 | 1,770 | 31.3 | 15.5 | 35 | 11.1 | 18.4 | 0 | 18 | moderado | 1 |
| 2022-07-29 | 167 | 709 | 32.3 | 14.8 | 33 | 10.8 | 16.2 | 0 | 18.7 | moderado | 1 |
| 2022-07-30 | 76 | 946 | 29.7 | 15.8 | 43 | 15.3 | 33.1 | 0.9 | 26 | alto | 1 |
| 2022-07-31 | 35 | 106 | 26.4 | 19.3 | 55 | 13.5 | 28.8 | 0.5 | 13 | moderado | 1 |
| 2022-08-01 | 55 | 309 | 29.4 | 17.8 | 43 | 19.7 | 45.4 | 0 | 26.7 | alto | 1 |
| 2022-08-02 | 50 | 391 | 24.9 | 18.5 | 49 | 20.3 | 49 | 0.5 | 29.6 | alto | 1 |
| 2022-08-03 | 53 | 367 | 25.4 | 18.2 | 54 | 15.6 | 37.4 | 0.1 | 23.4 | alto | 1 |
| 2022-08-04 | 38 | 55 | 27.4 | 18.4 | 42 | 14.7 | 31.7 | 0 | 20.2 | moderado | 1 |
| 2022-08-05 | 228 | 2,006 | 26.9 | 16.6 | 46 | 18.5 | 41.8 | 0 | 25 | alto | 1 |
| 2022-08-06 | 250 | 2,734 | 24.9 | 17.5 | 46 | 24.9 | 59.4 | 0 | 36.7 | alto | 1 |
| 2022-08-07 | 0 | 0 | 18.8 | 14 | 60 | 23.3 | 53.3 | 1 | 19.3 | moderado | 1 |
| 2022-08-08 | 46 | 181 | 21.8 | 13.1 | 47 | 15.2 | 37.4 | 0 | 20.8 | moderado | 1 |
| 2022-08-09 | 0 | 0 | 23.5 | 14 | 36 | 11.5 | 25.2 | 0.7 | 21.9 | alto | 1 |
| 2022-08-10 | 2 | 3 | 22 | 14.5 | 52 | 12.5 | 21.6 | 1.5 | 20.5 | moderado | 1 |
| 2022-08-11 | 0 | 0 | 18.6 | 13.1 | 69 | 4.5 | 14 | 0.8 | 3.5 | muy_bajo | 1 |
| 2022-08-12 | 19 | 26 | 23 | 12.2 | 45 | 9.9 | 27.7 | 0 | 11.5 | moderado | 1 |
| 2022-08-13 | 27 | 37 | 22.6 | 11.4 | 49 | 9.2 | 27 | 0 | 16.1 | moderado | 1 |
| 2022-08-14 | 39 | 127 | 25.2 | 12 | 43 | 9.8 | 20.5 | 1 | 16.6 | moderado | 1 |
| 2022-08-15 | 20 | 144 | 24.4 | 12.7 | 41 | 10.4 | 30.6 | 0 | 14.5 | moderado | 1 |
| 2022-08-16 | 0 | 0 | 21.7 | 12.1 | 62 | 10.2 | 25.2 | 6 | 12.1 | moderado | 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
- 10,406ha
- GWIS perimeter (Copernicus)
- Duration
- 22days
- 25 Jul 2022 – 15 Aug 2022
- Municipalities hit
- 1
- districts
- Started on
- 25 Jul
- 2022
- Heat detections
- 1,500
- in a single hotspot: 103 MW
- Danger at start
- 11
- Moderate · FWI index
- Average daily power
- 567MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
25 Jul15 Aug
15 Aug 2022
How it evolved, day by day
25 Jul
29 Jul
2 Aug
6 Aug
13 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
59km/h · peak gust
33%lowest humidity
It had gone one day without rain (1 mm or more) when it started. Rain came after the fire: 6.0 mm on 16 Aug.
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
-
Ust-Maysky Ulus where it started10,564 ha reached on 25 Jul0.1 %
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 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) |
|---|---|---|---|---|---|
| 25 Jul | 26.0 °C | 45 % | 39 km/h | 0.0 mm | Moderate 11 |
| 26 Jul | 27.1 °C | 34 % | 27 km/h | 0.0 mm | Moderate 13 |
| 27 Jul | 29.8 °C | 37 % | 22 km/h | 0.0 mm | Moderate 18 |
| 28 Jul | 31.3 °C | 35 % | 18 km/h | 0.0 mm | Moderate 18 |
| 29 Jul | 32.3 °C | 33 % | 16 km/h | 0.0 mm | Moderate 19 |
| 30 Jul | 29.7 °C | 43 % | 33 km/h | 0.9 mm | High 26 |
| 31 Jul | 26.4 °C | 55 % | 29 km/h | 0.5 mm | Moderate 13 |
| 1 Aug | 29.4 °C | 43 % | 45 km/h | 0.0 mm | High 27 |
| 2 Aug | 24.9 °C | 49 % | 49 km/h | 0.5 mm | High 30 |
| 3 Aug | 25.4 °C | 54 % | 37 km/h | 0.1 mm | High 23 |
| 4 Aug | 27.4 °C | 42 % | 32 km/h | 0.0 mm | Moderate 20 |
| 5 Aug | 26.9 °C | 46 % | 42 km/h | 0.0 mm | High 25 |
| 6 Aug | 24.9 °C | 46 % | 59 km/h | 0.0 mm | High 37 |
| 7 Aug | 18.8 °C | 60 % | 53 km/h | 1.0 mm | Moderate 19 |
| 8 Aug | 21.8 °C | 47 % | 37 km/h | 0.0 mm | Moderate 21 |
| 9 Aug | 23.5 °C | 36 % | 25 km/h | 0.7 mm | High 22 |
| 10 Aug | 22.0 °C | 52 % | 22 km/h | 1.5 mm | Moderate 20 |
| 11 Aug | 18.6 °C | 69 % | 14 km/h | 0.8 mm | Very low 4 |
| 12 Aug | 23.0 °C | 45 % | 28 km/h | 0.0 mm | Moderate 12 |
| 13 Aug | 22.6 °C | 49 % | 27 km/h | 0.0 mm | Moderate 16 |
| 14 Aug | 25.2 °C | 43 % | 20 km/h | 1.0 mm | Moderate 17 |
| 15 Aug | 24.4 °C | 41 % | 31 km/h | 0.0 mm | Moderate 14 |
| 16 Aug after | 21.7 °C | 62 % | 25 km/h | 6.0 mm | Moderate 12 |
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
↔
Before · 18 Jul 2022
After · 22 Aug 2022
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 · 1,500Every 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 Ust-Maysky Ulus fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 25 July 2022 to 15 August 2022 (22 days). The perimeter dates it from 25 July 2022 to 8 August 2022.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 10,406 hectares (104.1 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Ust-Maysky Ulus (10,564 ha, 0.1 %).
- What was the weather like?
- During the fire the temperature reached 32.3 °C, humidity dropped to 33 % and gusts hit 59 km/h. The fire danger index (FWI) reached 37, 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
History of this page · 1 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
- Last day with fire: 8 August 2022 → 15 August 2022.
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 adjusted with the VIIRS detections inside the perimeter, which said 25 July 2022 to 8 August 2022. 1,500 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.