Burned area
satellite only22,362ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 25 Sept 2018 – 2 Nov 2018
+− cross-check
No official record is matched to this page to compare it with.
AU · Australia · –
West Arnhem fire, 25 September 2018 West Arnhem
Out · last detection 3 Nov 2018, 04:15 UTC
The fire started on 25 September 2018 in West Arnhem, Australia, and satellites saw it burning for 39 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 22,362 hectares from heat detections, spread across a single municipality.
This entry is probably a savanna fire in Australia’s tropical north, not a bushfire like those in the south of the country. Millions of hectares of northern savanna and grassland burn every year: much of it in burns lit on purpose early in the dry season (traditional fire management, parks and cattle stations), the rest in grass fires that return to the same ground every few years. This is our assumption, based on the location; it is not confirmed. That is why it is left out of the wildfire rankings.
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Use this data
Fire page data · version 2026-10-26matches 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 only39days
25 Sept 2018 to 2 Nov 2018: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 3 Nov 2018, 04:15 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 Sept 2018
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 25 Sept 2018
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only833
VIIRS detections at 375 m. Most intense hotspot: 153 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 25 Sept 2018 – 2 Nov 2018
+− 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 only2,231MW
Total radiative power on 2 October 2018; hotspots that day: 109.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 2 Oct 2018
+− 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
model26.3FWI · high
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 50.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 25 Sept 2018, 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
model31.8°C · 53% RH
High of 31.8 °C and minimum humidity of 53% on 23 October 2018; gusts of 53 km/h on 30 September 2018.
- Source
- weather model at the fire’s grid cell
- Date
- 25 Sept 2018 – 2 Nov 2018
- 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: 28 October 2018 → 2 November 2018.
-
logStart date: 26 September 2018 → 25 September 2018.
-
· reconstructed weatherWeather and FWI computed from the ERA5 reanalysis
-
· reconstructed GHSLPopulation and built-up area computed
What was saved on 26 October 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
- 22,362 ha
- Dates
- 25 Sept 2018 – 2 Nov 2018
- Name
- West Arnhem
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/west-arnhem-2018-09-11?v=2026-10-26A 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 west-arnhem-2018-09-11.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2018-09-25 | 6 | 78 | 29.9 | 24.5 | 45 | 20.9 | 42.5 | 0 | 26.3 | alto | 1 |
| 2018-09-26 | 2 | 8 | 29.2 | 24.5 | 51 | 20.7 | 41 | 0 | 26.5 | alto | 1 |
| 2018-09-27 | 2 | 6 | 28.9 | 24.9 | 56 | 19.9 | 41 | 0 | 24.9 | alto | 1 |
| 2018-09-28 | 17 | 115 | 29.4 | 25 | 54 | 24.9 | 47.5 | 0.2 | 28.5 | alto | 1 |
| 2018-09-29 | 48 | 797 | 28.4 | 24.4 | 52 | 27.7 | 52.2 | 0 | 30.9 | alto | 1 |
| 2018-09-30 | 68 | 1,076 | 29 | 23.7 | 47 | 25.7 | 53.3 | 0 | 29.7 | alto | 1 |
| 2018-10-01 | 88 | 1,070 | 28.3 | 24.1 | 55 | 21.4 | 42.8 | 0 | 26.5 | alto | 1 |
| 2018-10-02 | 109 | 2,231 | 28.1 | 24.2 | 62 | 23.6 | 49.3 | 0.5 | 25 | alto | 1 |
| 2018-10-03 | 41 | 300 | 29 | 23.6 | 55 | 19.4 | 41.4 | 0 | 22.6 | alto | 1 |
| 2018-10-04 | 54 | 217 | 28.9 | 24.5 | 60 | 15.1 | 31 | 0 | 20.4 | moderado | 1 |
| 2018-10-05 | 43 | 577 | 29.5 | 24.3 | 57 | 13 | 26.6 | 0 | 19.4 | moderado | 1 |
| 2018-10-06 | 52 | 577 | 29.5 | 24.2 | 60 | 15 | 28.8 | 0 | 20.7 | moderado | 1 |
| 2018-10-07 | 29 | 180 | 29.7 | 24.2 | 57 | 15.2 | 32 | 0 | 21 | moderado | 1 |
| 2018-10-08 | 26 | 105 | 30.2 | 23.8 | 45 | 13.3 | 28.8 | 0 | 22.7 | alto | 1 |
| 2018-10-09 | 12 | 68 | 30.3 | 23.9 | 49 | 16.6 | 34.2 | 0 | 24.9 | alto | 1 |
| 2018-10-10 | 33 | 378 | 30 | 24.2 | 52 | 16.4 | 35.3 | 0 | 25 | alto | 1 |
| 2018-10-11 | 24 | 531 | 30 | 24.1 | 58 | 13.7 | 28.1 | 0 | 22.2 | alto | 1 |
| 2018-10-12 | 17 | 109 | 30.6 | 24.8 | 55 | 16.5 | 32 | 0 | 24 | alto | 1 |
| 2018-10-13 | 26 | 90 | 30.1 | 25.6 | 59 | 14.4 | 24.8 | 0 | 22.2 | alto | 1 |
| 2018-10-14 | 1 | 5 | 30.8 | 25.5 | 52 | 11.4 | 24.5 | 0 | 20.7 | moderado | 1 |
| 2018-10-15 | 3 | 3 | 30.7 | 26 | 62 | 12.4 | 27.7 | 0.3 | 20.3 | moderado | 1 |
| 2018-10-16 | 11 | 40 | 29.6 | 25.7 | 61 | 15.3 | 32.4 | 0 | 21.8 | alto | 1 |
| 2018-10-17 | 7 | 38 | 30.2 | 25.5 | 57 | 16.4 | 33.5 | 0 | 22.6 | alto | 1 |
| 2018-10-18 | 18 | 368 | 30.3 | 25.5 | 58 | 10.1 | 26.3 | 0.4 | 19.3 | moderado | 1 |
| 2018-10-19 | 11 | 248 | 30.5 | 26.3 | 66 | 9.5 | 24.8 | 0.5 | 17.4 | moderado | 1 |
| 2018-10-20 | 3 | 16 | 30.9 | 26.3 | 58 | 13.3 | 25.9 | 0.5 | 19.4 | moderado | 1 |
| 2018-10-21 | 0 | 0 | 31.1 | 26.6 | 57 | 10.1 | 20.5 | 0 | 18.1 | moderado | 1 |
| 2018-10-22 | 14 | 53 | 31.2 | 26.2 | 59 | 14.8 | 23.8 | 0.1 | 20.7 | moderado | 1 |
| 2018-10-23 | 13 | 126 | 31.8 | 27.5 | 53 | 12 | 22.7 | 0.2 | 20.6 | moderado | 1 |
| 2018-10-24 | 2 | 6 | 31 | 26.6 | 63 | 12.2 | 26.3 | 1.9 | 8.4 | bajo | 1 |
| 2018-10-25 | 4 | 18 | 31.5 | 26.4 | 58 | 16.3 | 27.7 | 0 | 17.3 | moderado | 1 |
| 2018-10-26 | 26 | 156 | 31.3 | 26.3 | 50 | 12.8 | 24.1 | 0 | 20.6 | moderado | 1 |
| 2018-10-27 | 9 | 46 | 31.3 | 26.8 | 52 | 15.7 | 27.7 | 0 | 22.7 | alto | 1 |
| 2018-10-28 | 2 | 22 | 30.6 | 26.1 | 50 | 15.9 | 32.4 | 0.3 | 23.4 | alto | 1 |
| 2018-10-29 | 0 | 0 | 30.7 | 25.7 | 49 | 15.6 | 31.3 | 0 | 23.8 | alto | 1 |
| 2018-10-30 | 1 | 10 | 31 | 26.2 | 57 | 9.8 | 26.3 | 0 | 20.6 | moderado | 1 |
| 2018-10-31 | 0 | 0 | 31.5 | 26.4 | 60 | 20.5 | 44.3 | 4.7 | 7.7 | bajo | 1 |
| 2018-11-01 | 0 | 0 | 29.9 | 25.9 | 71 | 18.9 | 41.8 | 1.2 | 8.3 | bajo | 1 |
| 2018-11-02 | 6 | 63 | 30.6 | 27.3 | 64 | 25 | 49.7 | 0 | 17.2 | moderado | 1 |
| 2018-11-03 | 5 | 92 | 29.9 | 27.2 | 66 | 19 | 42.5 | 0 | 16.2 | moderado | 0 |
| 2018-11-04 | 0 | 0 | 30.5 | 26.2 | 56 | 18.3 | 36 | 1 | 15.7 | 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
- 22,362ha
- GWIS perimeter (Copernicus)
- Duration
- 39days
- 25 Sept 2018 – 2 Nov 2018
- Municipalities hit
- 1
- local government areas
- Started on
- 25 Sept
- 2018
- Heat detections
- 833
- in a single hotspot: 153 MW
- Danger at start
- 26
- High · FWI index
- Average daily power
- 273MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
25 Sept2 Nov
3 Nov 2018
How it evolved, day by day
25 Sept
2 Oct
11 Oct
19 Oct
28 Oct
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
53km/h · peak gust
45%lowest humidity
It had gone 50 days without rain (1 mm or more) when it started. Rain came after the fire: 1.0 mm on 4 Nov.
This area had burned before
92% of the perimeter overlaps earlier fires recorded since 2016: 1,650 ha in 2016, 21,301 ha in 2017. Part of it burned more than once, so the yearly figures add up to more than the 20,521 ha that had burned before.
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
-
West Arnhem where it started22,301 ha reached on 25 Sept0.4 %
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 area0.13 ha
Residents< 20
Inside the perimeter there were about 0.13 hectares of 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 Sept | 29.9 °C | 45 % | 42 km/h | 0.0 mm | High 26 |
| 26 Sept | 29.2 °C | 51 % | 41 km/h | 0.0 mm | High 26 |
| 27 Sept | 28.9 °C | 56 % | 41 km/h | 0.0 mm | High 25 |
| 28 Sept | 29.4 °C | 54 % | 48 km/h | 0.2 mm | High 28 |
| 29 Sept | 28.4 °C | 52 % | 52 km/h | 0.0 mm | High 31 |
| 30 Sept | 29.0 °C | 47 % | 53 km/h | 0.0 mm | High 30 |
| 1 Oct | 28.3 °C | 55 % | 43 km/h | 0.0 mm | High 26 |
| 2 Oct | 28.1 °C | 62 % | 49 km/h | 0.5 mm | High 25 |
| 3 Oct | 29.0 °C | 55 % | 41 km/h | 0.0 mm | High 23 |
| 4 Oct | 28.9 °C | 60 % | 31 km/h | 0.0 mm | Moderate 20 |
| 5 Oct | 29.5 °C | 57 % | 27 km/h | 0.0 mm | Moderate 19 |
| 6 Oct | 29.5 °C | 60 % | 29 km/h | 0.0 mm | Moderate 21 |
| 7 Oct | 29.7 °C | 57 % | 32 km/h | 0.0 mm | Moderate 21 |
| 8 Oct | 30.2 °C | 45 % | 29 km/h | 0.0 mm | High 23 |
| 9 Oct | 30.3 °C | 49 % | 34 km/h | 0.0 mm | High 25 |
| 10 Oct | 30.0 °C | 52 % | 35 km/h | 0.0 mm | High 25 |
| 11 Oct | 30.0 °C | 58 % | 28 km/h | 0.0 mm | High 22 |
| 12 Oct | 30.6 °C | 55 % | 32 km/h | 0.0 mm | High 24 |
| 13 Oct | 30.1 °C | 59 % | 25 km/h | 0.0 mm | High 22 |
| 14 Oct | 30.8 °C | 52 % | 24 km/h | 0.0 mm | Moderate 21 |
| 15 Oct | 30.7 °C | 62 % | 28 km/h | 0.3 mm | Moderate 20 |
| 16 Oct | 29.6 °C | 61 % | 32 km/h | 0.0 mm | High 22 |
| 17 Oct | 30.2 °C | 57 % | 34 km/h | 0.0 mm | High 23 |
| 18 Oct | 30.3 °C | 58 % | 26 km/h | 0.4 mm | Moderate 19 |
| 19 Oct | 30.5 °C | 66 % | 25 km/h | 0.5 mm | Moderate 17 |
| 20 Oct | 30.9 °C | 58 % | 26 km/h | 0.5 mm | Moderate 19 |
| 21 Oct | 31.1 °C | 57 % | 20 km/h | 0.0 mm | Moderate 18 |
| 22 Oct | 31.2 °C | 59 % | 24 km/h | 0.1 mm | Moderate 21 |
| 23 Oct | 31.8 °C | 53 % | 23 km/h | 0.2 mm | Moderate 21 |
| 24 Oct | 31.0 °C | 63 % | 26 km/h | 1.9 mm | Low 8 |
| 25 Oct | 31.5 °C | 58 % | 28 km/h | 0.0 mm | Moderate 17 |
| 26 Oct | 31.3 °C | 50 % | 24 km/h | 0.0 mm | Moderate 21 |
| 27 Oct | 31.3 °C | 52 % | 28 km/h | 0.0 mm | High 23 |
| 28 Oct | 30.6 °C | 50 % | 32 km/h | 0.3 mm | High 23 |
| 29 Oct | 30.7 °C | 49 % | 31 km/h | 0.0 mm | High 24 |
| 30 Oct | 31.0 °C | 57 % | 26 km/h | 0.0 mm | Moderate 21 |
| 31 Oct | 31.5 °C | 60 % | 44 km/h | 4.7 mm | Low 8 |
| 1 Nov | 29.9 °C | 71 % | 42 km/h | 1.2 mm | Low 8 |
| 2 Nov | 30.6 °C | 64 % | 50 km/h | 0.0 mm | Moderate 17 |
| 3 Nov after | 29.9 °C | 66 % | 42 km/h | 0.0 mm | Moderate 16 |
| 4 Nov after | 30.5 °C | 56 % | 36 km/h | 1.0 mm | Moderate 16 |
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
↔
Before · 18 Sept 2018
After · 9 Nov 2018
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 · 833Every 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 West Arnhem fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 25 September 2018 to 2 November 2018 (39 days). The perimeter dates it from 26 September 2018 to 28 October 2018.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 22,362 hectares (223.6 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered West Arnhem (22,301 ha, 0.4 %).
- What was the weather like?
- During the fire the temperature reached 31.8 °C, humidity dropped to 45 % and gusts hit 53 km/h. The fire danger index (FWI) reached 31, class High.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Australia (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: 000 · Emergency number and official warnings
Satellite cross-check
History of this page · 2 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
- Last day with fire: 28 October 2018 → 2 November 2018.
- Start date: 26 September 2018 → 25 September 2018.
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 26 September 2018 to 28 October 2018. 833 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.
- Probably a vegetation burn: not counted in the totals.
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 (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.