Avensan fire, April 2021 Avensan
The fire started on 3 April 2021 in Avensan, France, and satellites saw it burning for 4 days. Copernicus mapped a burnt perimeter of 297 hectares from satellite imagery, spread across a single municipality.
It is the 8th largest in Gironde since 2016 (of 12 with a page). Number 4 in France in 2021, of 10.
The power measured by the satellite is low (5.1 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.
- Burnt area
- 297ha
- Copernicus perimeter
- Duration
- 4days
- 3 Apr 2021 – 6 Apr 2021
- Municipalities hit
- 1
- communes
- Started on
- 3 Apr
- 2021
- Heat detections
- 4
- in a single hotspot: 5 MW
- Danger at start
- 17
- Moderate · FWI index
- Average daily power
- 4MW
- detected power per day, on average
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 14 days without rain (1 mm or more) when it started. Rain came after the fire: 3.2 mm on 10 Apr.
This area had burned before
No earlier perimeters overlap this fire since 2016, when the satellite record begins.
What happened to each town
-
297 ha reached on 4 Apr5.6 %
Burnt area inside each municipality, from crossing the official 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.
What burned
- Scrub and transitional woodland49 %
- Coniferous forest38 %
- Mixed forest10 %
- Agricultural areas3.0 %
Land cover inside the perimeter according to Corine Land Cover, as reported by Copernicus.
Official record
According to BDIFF, a fire of 304 ha was recorded in Avensan on 3 April 2021 (the satellite measured 297 ha). The record has no coordinates, so it was matched by municipality and date.
- Avensan 3 April 2021 · 16:19 304 ha
BDIFF (Base de Données sur les Incendies de Forêts en France). This is the agency’s consolidated statistic: it measures the area in its own way, which is why it can differ from the satellite.
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) |
|---|---|---|---|---|---|
| 3 Apr | 15.9 °C | 38 % | 50 km/h | 0.0 mm | Moderate 17 |
| 4 Apr | 18.1 °C | 34 % | 37 km/h | 0.0 mm | Moderate 15 |
| 5 Apr | 16.4 °C | 48 % | 43 km/h | 0.0 mm | Moderate 14 |
| 6 Apr | 11.0 °C | 31 % | 37 km/h | 0.0 mm | Moderate 13 |
| 7 Apr after | 12.9 °C | 26 % | 28 km/h | 0.0 mm | Moderate 12 |
| 8 Apr after | 20.2 °C | 22 % | 30 km/h | 0.0 mm | Moderate 16 |
| 9 Apr after | 18.6 °C | 39 % | 39 km/h | 0.5 mm | Moderate 16 |
| 10 Apr after | 19.5 °C | 52 % | 38 km/h | 3.2 mm | Very low 2 |
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 2 April 2021 the air beside the fire reached 20 µg/m³ of PM2.5, but no daily average passed the WHO 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 · 4Every 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 Avensan fire last?
- Copernicus dates it between 3 April 2021 and 6 April 2021: 4 days between the first and last image with fire.
- How much area did it burn?
- The perimeter Copernicus measured from satellite imagery is 297 hectares (3.0 km²). Official national figures may differ.
- Which municipalities burned?
- The fire only entered Avensan (297 ha, 5.6 %).
- Did the fire reach a town?
- The closest fire to a town centre came within 2.8 km of Avensan. That is the distance to the perimeter or nearest hotspot; it does not mean it entered the houses.
- What was the weather like?
- During the fire the temperature reached 18.1 °C, humidity dropped to 31 % and gusts hit 50 km/h. The fire danger index (FWI) reached 17, class Moderate.
- Where does this data come from?
- From the EFFIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of France (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 · 18
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
How we know this
- Perimeter: EFFIS (Copernicus), mapped on satellite imagery.
- Dates from the perimeter: the VIIRS detections inside it did not change them. 4 Suomi-NPP VIIRS detections on those dates.
- Compared with BDIFF: 304 official ha against 297 ha of perimeter; they agree within 25%.
- Weather: Copernicus ERA5 reanalysis at the fire location, in cells of about 25 km.
Where this data comes from
The perimeter and land cover come from the Copernicus European Forest Fire Information System (EFFIS), measured on MODIS and Sentinel-2 imagery and published under CC BY 4.0. 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 ADM5 (Open Data Commons Attribution License 1.0). The area per municipality is computed by WorldFires by crossing the perimeter with those boundaries, so it may differ slightly from each country’s official figure.