Aldansky Ulus fire, 6 July 2023 Aldansky Ulus
The fire started on 6 July 2023 in Aldansky Ulus, Russia, and satellites saw it burning for 8 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 8,046 hectares from heat detections, spread across a single municipality.
It is the 629th largest in Sakha Republic since 2016 (of 1422 with a page). Number 129 in Russia in 2023, of 452.
- Burnt area
- 8,046ha
- GWIS perimeter (Copernicus)
- Duration
- 8days
- 6 Jul 2023 – 13 Jul 2023
- Municipalities hit
- 1
- districts
- Started on
- 6 Jul
- 2023
- Heat detections
- 695
- in a single hotspot: 63 MW
- Danger at start
- 22
- High · FWI index
- Energy released
- 5.9GW
- sum of detected power
Where it burned
How it evolved, day by day
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
It had gone 2 days without rain (1 mm or more) when it started. Rain came after the fire: 8.4 mm on 14 Jul.
This area had burned before
10% of the perimeter overlaps earlier fires recorded since 2016: 825 ha in 2018.
What happened to each town
-
Aldansky Ulus where it started8,195 ha reached on 6 Jul0.0 %
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) |
|---|---|---|---|---|---|
| 6 Jul | 30.2 °C | 33 % | 28 km/h | 0.0 mm | High 22 |
| 7 Jul | 29.5 °C | 25 % | 22 km/h | 0.3 mm | High 26 |
| 8 Jul | 24.0 °C | 45 % | 66 km/h | 3.6 mm | Low 10 |
| 9 Jul | 19.7 °C | 33 % | 54 km/h | 0.0 mm | Moderate 18 |
| 10 Jul | 26.7 °C | 33 % | 36 km/h | 0.0 mm | Moderate 21 |
| 11 Jul | 31.1 °C | 23 % | 28 km/h | 0.0 mm | High 28 |
| 12 Jul | 32.3 °C | 27 % | 34 km/h | 0.1 mm | High 28 |
| 13 Jul | 26.6 °C | 55 % | 34 km/h | 7.0 mm | Very low 4 |
| 14 Jul after | 14.0 °C | 81 % | 25 km/h | 8.4 mm | Very low 0 |
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
If the day is cloudy, change the date: each satellite passes once a day. In false colour the burnt ground looks brown or red.
The smoke
CAMS · CopernicusOn 13 July 2023 the air beside the fire reached 435 µg/m³ of PM2.5. That day averaged 126: 8.4 times the WHO daily guideline (15).
Particles from the Copernicus CAMS model at the centre of the perimeter; these are not measurements in each town. The pale bar is the worst hour, the solid one the daily average.
Open-Meteo.com (CC BY 4.0) · Copernicus Atmosphere Monitoring Service (CAMS)
Detections table · 695Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
Frequently asked questions
- How long did the Aldansky Ulus fire last?
- GWIS (Copernicus) dates it between 6 July 2023 and 13 July 2023: 8 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 8,046 hectares (80.5 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Aldansky Ulus (8,195 ha, 0.0 %).
- What was the weather like?
- During the fire the temperature reached 32.3 °C, humidity dropped to 23 % and gusts hit 66 km/h. The fire danger index (FWI) reached 28, 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
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
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.