Älvdalen fire, 17 July 2018 Älvdalen
The fire started on 17 July 2018 in Älvdalen, Sweden, and satellites saw it burning for 10 days. Copernicus mapped a burnt perimeter of 1,289 hectares from satellite imagery, spread across a single municipality.
Number 5 in Sweden in 2018, of 25.
Compare with…
Suggestions: Älvdalen · 2018Älvdalen · 2018Härjedalen · 2018
- Burnt area
- 1,289ha
- Copernicus perimeter
- Duration
- 10days
- 17 Jul 2018 – 26 Jul 2018
- Municipalities hit
- 1
- municipalities
- Started on
- 17 Jul
- 2018
- Heat detections
- 155
- in a single hotspot: 161 MW
- Danger at start
- 23
- High · FWI index
- Average daily power
- 178MW
- 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 3 days without rain (1 mm or more) when it started. Rain came after the fire: 4.7 mm on 28 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).
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).
Berlin boundary: geoBoundaries · Federal Agency for Cartography and Geodesy (dl-de/by-2-0).
This compares size, not location: both shapes are at the same scale, north up, centred on each other.
What happened to each town
-
Älvdalen where it started1,284 ha reached on 17 Jul0.2 %
Burnt area inside each municipality, from crossing the official 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.
What burned
- Coniferous forest52 %
- Other natural land39 %
- Scrub and transitional woodland8.6 %
Land cover inside the perimeter according to Corine Land Cover, as reported by Copernicus.
People and buildings inside the perimeter
GHSL 2020Inside 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) |
|---|---|---|---|---|---|
| 17 Jul | 26.9 °C | 30 % | 35 km/h | 0.0 mm | High 23 |
| 18 Jul | 25.1 °C | 39 % | 41 km/h | 0.7 mm | Moderate 16 |
| 19 Jul | 24.1 °C | 42 % | 22 km/h | 3.3 mm | Very low 3 |
| 20 Jul | 24.0 °C | 50 % | 21 km/h | 1.5 mm | Very low 4 |
| 21 Jul | 23.5 °C | 50 % | 21 km/h | 0.2 mm | Low 7 |
| 22 Jul | 23.4 °C | 47 % | 22 km/h | 0.8 mm | Low 9 |
| 23 Jul | 25.8 °C | 40 % | 25 km/h | 0.0 mm | Moderate 14 |
| 24 Jul | 26.9 °C | 36 % | 40 km/h | 0.1 mm | Moderate 19 |
| 25 Jul | 26.6 °C | 37 % | 50 km/h | 0.0 mm | Moderate 20 |
| 26 Jul | 24.2 °C | 46 % | 34 km/h | 0.0 mm | Moderate 19 |
| 27 Jul after | 26.6 °C | 45 % | 31 km/h | 0.4 mm | Moderate 19 |
| 28 Jul after | 23.2 °C | 55 % | 58 km/h | 4.7 mm | Very low 4 |
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 · 155Every 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 Älvdalen fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 17 July 2018 to 26 July 2018 (10 days). The perimeter dates it from 23 July 2018 to 26 July 2018.
- How much area did it burn?
- The perimeter Copernicus measured from satellite imagery is 1,289 hectares (12.9 km²). Official national figures may differ.
- Which municipalities burned?
- The fire only entered Älvdalen (1,284 ha, 0.2 %).
- What was the weather like?
- During the fire the temperature reached 26.9 °C, humidity dropped to 30 % and gusts hit 50 km/h. The fire danger index (FWI) reached 23, class High.
- Where does this data come from?
- From the EFFIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Sweden (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.
- Start date: 23 July 2018 → 17 July 2018.
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 adjusted with the VIIRS detections inside the perimeter, which said 23 July 2018 to 26 July 2018. 155 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 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 ADM2 (CC0 1.0 Universal (CC0 1.0) Public Domain Dedication). 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.