Burned area
satellite only1,032ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 8 Jun 2018 – 12 Jun 2018
+− cross-check
No official record is matched to this page to compare it with.
CG · Republic of the Congo · –
Ouésso fire, June 2018 Ouésso
Out · last detection 12 Jun 2018, 00:04 UTC
The fire started on 8 June 2018 in Ouésso, Republic of the Congo, and satellites saw it burning for 5 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 1,032 hectares from heat detections, spread across a single municipality.
It is the 11th largest in Sangha since 2016 (of 12 with a page). Number 57 in Republic of the Congo in 2018, of 62.
The power measured by the satellite is low (25.7 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.
Use this data
Compare with…
Suggestions: Mbomo · 2020Mbomo · 2018Ouésso · 2016Mbomo · 2026
Use this data
Fire page data · version 2026-10-24matches 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 only5days
8 Jun 2018 to 12 Jun 2018: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 12 Jun 2018, 00:04 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 only8 Jun 2018
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 8 Jun 2018
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only23
VIIRS detections at 375 m. Most intense hotspot: 26 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 8 Jun 2018 – 12 Jun 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 only89MW
Total radiative power on 9 June 2018; hotspots that day: 10.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 9 Jun 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
model4.4FWI · very low
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 2.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 8 Jun 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 · 57% RH
High of 31.8 °C and minimum humidity of 57% on 11 June 2018; gusts of 30 km/h on 12 June 2018.
- Source
- weather model at the fire’s grid cell
- Date
- 8 Jun 2018 – 12 Jun 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
-
· reconstructed weatherWeather and FWI computed from the ERA5 reanalysis
What was saved on 24 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
- 1,032 ha
- Dates
- 8 Jun 2018 – 12 Jun 2018
- Name
- Mayama
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/ouesso-2018-06?v=2026-10-24A 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 ouesso-2018-06.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2018-06-08 | 6 | 44 | 30.8 | 20.2 | 51 | 6.6 | 20.9 | 0 | 4.4 | muy_bajo | 1 |
| 2018-06-09 | 10 | 89 | 30.9 | 21 | 56 | 8.1 | 25.6 | 0.1 | 5.2 | muy_bajo | 1 |
| 2018-06-10 | 5 | 27 | 31.1 | 21.3 | 55 | 8.5 | 25.9 | 0.1 | 5.7 | bajo | 1 |
| 2018-06-11 | 1 | 1 | 31.8 | 20.8 | 57 | 6.9 | 17.6 | 0 | 5.8 | bajo | 1 |
| 2018-06-12 | 1 | 1 | 30.9 | 22.7 | 63 | 7.8 | 29.5 | 0.2 | 5.8 | bajo | 1 |
| 2018-06-13 | 0 | 0 | 29.4 | 22.4 | 72 | 8.8 | 28.8 | 1.9 | 0.9 | muy_bajo | 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). Open-Meteo.com · How we build fire pages: methodology
- Burnt area
- 1,032ha
- GWIS perimeter (Copernicus)
- Duration
- 5days
- 8 Jun 2018 – 12 Jun 2018
- Municipalities hit
- 1
- districts
- Started on
- 8 Jun
- 2018
- Heat detections
- 23
- in a single hotspot: 26 MW
- Danger at start
- 4
- Very low · FWI index
- Average daily power
- 33MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
8 Jun12 Jun
12 Jun 2018
How it evolved, day by day
8 Jun
9 Jun
10 Jun
11 Jun
12 Jun
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
30km/h · peak gust
51%lowest humidity
It had gone 2 days without rain (1 mm or more) when it started. Rain came after the fire: 1.9 mm on 13 Jun.
This area had burned before
72% of the perimeter overlaps earlier fires recorded since 2016: 745 ha in 2016.
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
-
Ouésso where it started1,039 ha reached on 8 Jun0.0 %
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.
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) |
|---|---|---|---|---|---|
| 8 Jun | 30.8 °C | 51 % | 21 km/h | 0.0 mm | Very low 4 |
| 9 Jun | 30.9 °C | 56 % | 26 km/h | 0.1 mm | Very low 5 |
| 10 Jun | 31.1 °C | 55 % | 26 km/h | 0.1 mm | Low 6 |
| 11 Jun | 31.8 °C | 57 % | 18 km/h | 0.0 mm | Low 6 |
| 12 Jun | 30.9 °C | 63 % | 30 km/h | 0.2 mm | Low 6 |
| 13 Jun after | 29.4 °C | 72 % | 29 km/h | 1.9 mm | Very low 1 |
Its twins: fires that started in the same weather
It started with an FWI of 4.4, a minimum humidity of 51% and 2 days without rain. Fires in the area that started in weather like this since 2016: 28.
FWI at the start
4.4
Minimum humidity
51 %
Days without rain
2
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Ouésso fire, June 2018
1,032 ha
5 days
FWI 4.4
Min. humidity 51 %
Mbomo fire, February 2020
2,016 ha
3 days
FWI 3.6
Min. humidity 51 %
41 km away, in 2020
First rain (1 mm or more) after it ended: 9.3 mm on 16 Feb.
Mbomo fire, March 2018
1,012 ha
2 days
FWI 3.2
Min. humidity 51 %
54 km away, in 2018
First rain (1 mm or more) after it ended: 6.5 mm on 15 Mar.
Mbomo fire, March 2023
1,607 ha
2 days
FWI 7.4
Min. humidity 51 %
36 km away, in 2023
First rain (1 mm or more) after it ended: 1.2 mm on 6 Mar.
Mbomo fire, March 2020
1,152 ha
1 day
FWI 0.6
Min. humidity 51 %
42 km away, in 2020
First rain (1 mm or more) after it ended: 11.4 mm on 16 Mar.
Djouori-Agnili fire, August 2018
1,009 ha
2 days
FWI 4.0
Min. humidity 53 %
247 km away, in 2018
First rain (1 mm or more) after it ended: 1.2 mm on 18 Aug.
What happened to them
- 3 days
- median duration
- 1,148 ha
- median area
- 100 %
- went past 1,000 ha
- 1.9 mm
- rain at the end (median; 26 of 28 had it)
It burned an area similar to its twins (1,032 ha against a median of 1,148 ha) and lasted 5 days, against 3 days.
In 2 of 28, not even 1 mm fell in the ten days after the end: they went out without rain. In the rest, the first rainy day brought a median of 1.9 mm.
This is a bank of analogues: it shows what usually happens, not what will happen. With fewer than 15 twins we give no figures. How we calculate it
How it ended
1.9 mmfirst rain
13 Junthe day after it ended
30km/h · max. gust
It was considered over on 12 Jun, and on 13 Jun 1.9 mm fell. We do not know whether the rain or the firefighters put it out. Twins with rain when they ended: 26 of 28, with a median of 1.9 mm.
Weather on this page: Open-Meteo.com (CC BY 4.0) · Copernicus Climate Change Service (ERA5)
How a twin is chosen
- Same area: fires that have already ended, less than 250 km from this one, since 2016.
- Same start: we compare the FWI on the first day, the minimum humidity that day and the run of days without rain before it. The slider sets how much they may differ.
- Only pages with final weather data (ERA5 reanalysis) calculated in the same way as this fire’s; agricultural and grass burns and pages with data under review are left out.
- Fires burning at the same time as this one (a week before or after) are left out: they share the same spell of weather and do not count as a precedent.
- They are sorted by similarity, and the outlines of the first five are drawn.
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
↔
Before · 1 Jun 2018
After · 19 Jun 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 · 23Every 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 Ouésso fire last?
- GWIS (Copernicus) dates it between 8 June 2018 and 12 June 2018: 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 1,032 hectares (10.3 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Ouésso (1,039 ha, 0.0 %).
- What was the weather like?
- During the fire the temperature reached 31.8 °C, humidity dropped to 51 % and gusts hit 30 km/h. The fire danger index (FWI) reached 6, class Low.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Republic of the Congo (geoBoundaries ADM2). It is not an official report.
- How did the fires that started in similar weather in this area end?
- Fires less than 250 km away that started since 2016 with a similar FWI, humidity and dry spell: 28. Their median duration was 3 days and their median area 1,148 ha; 100 % went past 1,000 ha. In 2 of 28, not even 1 mm fell in the ten days after the end: they went out without rain. In the rest, the first rainy day brought a median of 1.9 mm.
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
History of this page Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
No changes since 24 October 2026.
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 from the perimeter: the VIIRS detections inside it did not change them. 23 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.
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 (Map Library 2007, nombres de Wikidata) (Public Domain). 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.