Burned area
satellite only18,172ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 25 Aug 2023 – 2 Sept 2023
+− cross-check
No official record is matched to this page to compare it with.
AU · Australia · –
Roper Gulf fire, 25 August 2023 Roper Gulf
Out · last detection 2 Sept 2023, 04:39 UTC
The fire started on 25 August 2023 in Roper Gulf, Australia, and satellites saw it burning for 9 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 18,172 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.
Use this data
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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 only9days
25 Aug 2023 to 2 Sept 2023: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 2 Sept 2023, 04:39 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 Aug 2023
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 25 Aug 2023
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only614
VIIRS detections at 375 m. Most intense hotspot: 195 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 25 Aug 2023 – 2 Sept 2023
+− 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 only2,597MW
Total radiative power on 26 August 2023; hotspots that day: 192.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 26 Aug 2023
+− 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
model58.0FWI · extreme
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 53.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 25 Aug 2023, 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
model33.3°C · 9% RH
High of 33.3 °C and minimum humidity of 9% on 31 August 2023; gusts of 56 km/h on 26 August 2023.
- Source
- weather model at the fire’s grid cell
- Date
- 25 Aug 2023 – 2 Sept 2023
- 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: 30 August 2023 → 2 September 2023.
-
· 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
- 18,172 ha
- Dates
- 25 Aug 2023 – 2 Sept 2023
- Name
- Roper Gulf
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/roper-gulf-2023-08-8?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 roper-gulf-2023-08-8.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023-08-25 | 46 | 523 | 31.8 | 15.8 | 16 | 24.8 | 51.5 | 0 | 58 | extremo | 1 |
| 2023-08-26 | 192 | 2,597 | 31.9 | 16.8 | 19 | 28.2 | 55.8 | 0 | 62.3 | extremo | 1 |
| 2023-08-27 | 227 | 2,385 | 32.2 | 14.5 | 16 | 25.7 | 51.1 | 0 | 59.4 | extremo | 1 |
| 2023-08-28 | 121 | 798 | 32.4 | 13.6 | 14 | 20.1 | 43.2 | 0 | 52.8 | extremo | 1 |
| 2023-08-29 | 15 | 72 | 32.5 | 14.6 | 17 | 15.5 | 36 | 0 | 47.9 | muy_alto | 1 |
| 2023-08-30 | 12 | 48 | 33.1 | 14.3 | 15 | 14.8 | 32.8 | 0 | 47.5 | muy_alto | 1 |
| 2023-08-31 | 0 | 0 | 33.3 | 13.7 | 9 | 20.8 | 43.2 | 0 | 58.1 | extremo | 1 |
| 2023-09-01 | 0 | 0 | 32 | 14.3 | 13 | 17.6 | 38.2 | 0 | 54.4 | extremo | 1 |
| 2023-09-02 | 1 | 7 | 31.6 | 12.7 | 13 | 17.3 | 38.2 | 0 | 54.4 | extremo | 1 |
| 2023-09-03 | 0 | 0 | 32.5 | 13.7 | 13 | 11.6 | 30.2 | 0 | 48.1 | muy_alto | 0 |
| 2023-09-04 | 0 | 0 | 33.5 | 16 | 18 | 16.1 | 33.5 | 0 | 51.4 | extremo | 0 |
| 2023-09-05 | 0 | 0 | 34.7 | 17.1 | 15 | 17.3 | 33.8 | 0 | 53.2 | extremo | 0 |
| 2023-09-06 | 0 | 0 | 34.7 | 17.7 | 16 | 19.8 | 38.2 | 0 | 56.6 | extremo | 0 |
| 2023-09-07 | 0 | 0 | 35.9 | 17.1 | 14 | 15.3 | 34.9 | 0 | 51.4 | extremo | 0 |
| 2023-09-08 | 0 | 0 | 34.6 | 17.9 | 17 | 22.2 | 45 | 0 | 60.5 | extremo | 0 |
| 2023-09-09 | 0 | 0 | 34.9 | 18.2 | 15 | 24 | 47.9 | 0 | 63.4 | extremo | 0 |
| 2023-09-10 | 0 | 0 | 33.7 | 19.6 | 15 | 24.4 | 52.6 | 0 | 64.3 | extremo | 0 |
| 2023-09-11 | 0 | 0 | 33.9 | 18.8 | 10 | 23.3 | 47.5 | 0 | 63.1 | extremo | 0 |
| 2023-09-12 | 0 | 0 | 33.3 | 18.1 | 10 | 22.9 | 46.1 | 0 | 62.9 | extremo | 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
- 18,172ha
- GWIS perimeter (Copernicus)
- Duration
- 9days
- 25 Aug 2023 – 2 Sept 2023
- Municipalities hit
- 1
- local government areas
- Started on
- 25 Aug
- 2023
- Heat detections
- 614
- in a single hotspot: 195 MW
- Danger at start
- 58
- Extreme · FWI index
- Average daily power
- 919MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
25 Aug2 Sept
2 Sept 2023
How it evolved, day by day
26 Aug
29 Aug
2 Sept
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
33°high
56km/h · peak gust
9%lowest humidity
It had gone 53 days without rain (1 mm or more) when it started.
This area had burned before
3% of the perimeter overlaps earlier fires recorded since 2016: 605 ha in 2017.
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
-
Roper Gulf where it started18,406 ha reached on 25 Aug0.1 %
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 2025Built-up area< 0.1 ha
Residents< 20
Inside the perimeter there was no noticeable built-up land and almost nobody lived there (GHSL 2025, 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. The GHSL 2025 epoch is a projection made from 2020 and earlier data.
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)
Started with Strong wind: 20 % of the area in Australia
| Day | High | Min. humidity | Peak gust | Rain | Danger (FWI) |
|---|---|---|---|---|---|
| 25 Aug | 31.8 °C | 16 % | 52 km/h | 0.0 mm | Extreme 58 |
| 26 Aug | 31.9 °C | 19 % | 56 km/h | 0.0 mm | Extreme 62 |
| 27 Aug | 32.2 °C | 16 % | 51 km/h | 0.0 mm | Extreme 59 |
| 28 Aug | 32.4 °C | 14 % | 43 km/h | 0.0 mm | Extreme 53 |
| 29 Aug | 32.5 °C | 17 % | 36 km/h | 0.0 mm | Very high 48 |
| 30 Aug | 33.1 °C | 15 % | 33 km/h | 0.0 mm | Very high 48 |
| 31 Aug | 33.3 °C | 9 % | 43 km/h | 0.0 mm | Extreme 58 |
| 1 Sept | 32.0 °C | 13 % | 38 km/h | 0.0 mm | Extreme 54 |
| 2 Sept | 31.6 °C | 13 % | 38 km/h | 0.0 mm | Extreme 54 |
| 3 Sept after | 32.5 °C | 13 % | 30 km/h | 0.0 mm | Very high 48 |
| 4 Sept after | 33.5 °C | 18 % | 34 km/h | 0.0 mm | Extreme 51 |
| 5 Sept after | 34.7 °C | 15 % | 34 km/h | 0.0 mm | Extreme 53 |
| 6 Sept after | 34.7 °C | 16 % | 38 km/h | 0.0 mm | Extreme 57 |
| 7 Sept after | 35.9 °C | 14 % | 35 km/h | 0.0 mm | Extreme 51 |
| 8 Sept after | 34.6 °C | 17 % | 45 km/h | 0.0 mm | Extreme 60 |
| 9 Sept after | 34.9 °C | 15 % | 48 km/h | 0.0 mm | Extreme 63 |
| 10 Sept after | 33.7 °C | 15 % | 53 km/h | 0.0 mm | Extreme 64 |
| 11 Sept after | 33.9 °C | 10 % | 48 km/h | 0.0 mm | Extreme 63 |
| 12 Sept after | 33.3 °C | 10 % | 46 km/h | 0.0 mm | Extreme 63 |
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
↔
Before · 18 Aug 2023
After · 9 Sept 2023
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.
The smoke
CAMS · CopernicusOn 28 August 2023 the air beside the fire reached 50 µg/m³ of PM2.5. That day averaged 21: 1.4 times the WHO daily guideline (15).
PM2.5 peak50 µg/m³
Days over the guideline1 day
PM1071 µg/m³
Optical depth0.22
WHO 15
23 Aug26 Aug29 Aug1 Sept
Good
Fair
Moderate
Poor
Very poor
Extremely poor
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 · 614Every 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 Roper Gulf fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 25 August 2023 to 2 September 2023 (9 days). The perimeter dates it from 25 August 2023 to 30 August 2023.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 18,172 hectares (181.7 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Roper Gulf (18,406 ha, 0.1 %).
- What was the weather like?
- During the fire the temperature reached 33.3 °C, humidity dropped to 9 % and gusts hit 56 km/h. The fire danger index (FWI) reached 62, class Extreme.
- 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 · 1 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
- Last day with fire: 30 August 2023 → 2 September 2023.
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 25 August 2023 to 30 August 2023. 614 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 2025, 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.