Derrary fire, March 2021 Ouro Ali, Kéwa, Derrary
The fire started on 31 March 2021 in Derrary, Mali, and satellites saw it burning for 5 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 5,420 hectares from heat detections, spread across 3 municipalities.
It is the 17th largest in Mopti since 2016 (of 160 with a page). Number 9 in Mali in 2021, of 58.
- Burnt area
- 5,420ha
- GWIS perimeter (Copernicus)
- Duration
- 5days
- 31 Mar 2021 – 4 Apr 2021
- Municipalities hit
- 3
- communes
- Started on
- 31 Mar
- 2021
- Heat detections
- 300
- in a single hotspot: 91 MW
- Danger at start
- 73
- Very extreme · FWI index
- Energy released
- 1.8GW
- 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 more than two months without rain (1 mm or more) when it started.
This area had burned before
51% of the perimeter overlaps earlier fires recorded since 2016: 2,773 ha in 2020.
What happened to each town
-
3,019 ha reached on 1 Apr17 %
-
1,837 ha reached on 1 Apr1.7 %
-
Derrary where it started597 ha reached on 31 Mar3.4 %
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) |
|---|---|---|---|---|---|
| 31 Mar | 39.7 °C | 5 % | 39 km/h | 0.0 mm | Very extreme 73 |
| 1 Apr | 40.0 °C | 5 % | 44 km/h | 0.0 mm | Very extreme 74 |
| 2 Apr | 40.4 °C | 5 % | 52 km/h | 0.0 mm | Very extreme 83 |
| 3 Apr | 39.9 °C | 6 % | 37 km/h | 0.0 mm | Very extreme 71 |
| 4 Apr | 41.0 °C | 7 % | 38 km/h | 0.0 mm | Very extreme 74 |
| 5 Apr after | 42.4 °C | 5 % | 29 km/h | 0.0 mm | Extreme 62 |
| 6 Apr after | 42.8 °C | 4 % | 31 km/h | 0.0 mm | Extreme 66 |
| 7 Apr after | 43.0 °C | 3 % | 40 km/h | 0.0 mm | Very extreme 75 |
| 8 Apr after | 42.5 °C | 6 % | 52 km/h | 0.0 mm | Very extreme 88 |
| 9 Apr after | 42.8 °C | 6 % | 48 km/h | 0.0 mm | Very extreme 84 |
| 10 Apr after | 43.9 °C | 4 % | 36 km/h | 0.0 mm | Very extreme 70 |
| 11 Apr after | 43.6 °C | 6 % | 41 km/h | 0.0 mm | Very extreme 78 |
| 12 Apr after | 43.3 °C | 6 % | 26 km/h | 0.0 mm | Extreme 67 |
| 13 Apr after | 43.2 °C | 13 % | 33 km/h | 0.0 mm | Extreme 62 |
| 14 Apr after | 40.3 °C | 22 % | 45 km/h | 0.0 mm | Extreme 66 |
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.
Detections table · 300Every 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 Derrary fire last?
- GWIS (Copernicus) dates it between 31 March 2021 and 4 April 2021: 5 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 5,420 hectares (54.2 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 3 municipalities: Ouro Ali (3,019 ha, 17 %); Kéwa (1,837 ha, 1.7 %); Derrary (597 ha, 3.4 %).
- What was the weather like?
- During the fire the temperature reached 41.0 °C, humidity dropped to 5 % and gusts hit 52 km/h. The fire danger index (FWI) reached 83, class Very extreme.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Mali (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.
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 ADM3 (Creative Commons Attribution 4.0 International (CC BY 4.0)). 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.