Burned area
satellite only1,051ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 27 Jun 2023 – 28 Jun 2023
+− cross-check
No official record is matched to this page to compare it with.
CG · Republic of the Congo · –
Okoyo fire, June 2023 Okoyo
Out · last detection 28 Jun 2023, 01:08 UTC
The fire started on 27 June 2023 in Okoyo, Republic of the Congo, and satellites saw it burning for 2 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 1,051 hectares from heat detections, spread across a single municipality.
It is the 53th largest in Cuvette-Ouest since 2016 (of 57 with a page). Number 33 in Republic of the Congo in 2023, of 40.
The power measured by the satellite is low (7.7 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…
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 only2days
27 Jun 2023 to 28 Jun 2023: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 28 Jun 2023, 01:08 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 only27 Jun 2023
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 27 Jun 2023
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only10
VIIRS detections at 375 m. Most intense hotspot: 8 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 27 Jun 2023 – 28 Jun 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 only41MW
Total radiative power on 28 June 2023; hotspots that day: 10.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 28 Jun 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
model3.6FWI · very low
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 1.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 27 Jun 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
model28.7°C · 65% RH
High of 28.7 °C and minimum humidity of 65% on 27 June 2023; gusts of 26 km/h on 27 June 2023.
- Source
- weather model at the fire’s grid cell
- Date
- 27 Jun 2023 – 28 Jun 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
-
· 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
- 1,051 ha
- Dates
- 27 Jun 2023 – 28 Jun 2023
- Name
- Kakamoéka
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/okoyo-2023-06?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 okoyo-2023-06.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023-06-27 | 0 | 0 | 28.7 | 21.2 | 65 | 12.3 | 26.3 | 0.6 | 3.6 | muy_bajo | 1 |
| 2023-06-28 | 10 | 41 | 27.2 | 21.2 | 65 | 12 | 25.6 | 0.8 | 3.7 | muy_bajo | 1 |
| 2023-06-29 | 0 | 0 | 29 | 20.5 | 61 | 9.7 | 24.5 | 0.3 | 5.2 | bajo | 0 |
| 2023-06-30 | 0 | 0 | 26.3 | 21.2 | 71 | 10.7 | 26.3 | 0.9 | 3.2 | muy_bajo | 0 |
| 2023-07-01 | 0 | 0 | 29 | 20.9 | 66 | 7.9 | 22.3 | 4 | 0.6 | 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
- 1,051ha
- GWIS perimeter (Copernicus)
- Duration
- 2days
- 27 Jun 2023 – 28 Jun 2023
- Municipalities hit
- 1
- districts
- Started on
- 27 Jun
- 2023
- Heat detections
- 10
- in a single hotspot: 8 MW
- Danger at start
- 4
- Very low · FWI index
- Average daily power
- 41MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
27 Jun28 Jun
How it evolved, day by day
28 Jun 2023 · 41 MW · 10
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
29°high
26km/h · peak gust
65%lowest humidity
It had gone one day without rain (1 mm or more) when it started. Rain came after the fire: 4.0 mm on 1 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
-
Okoyo where it started1,058 ha reached on 28 Jun0.2 %
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) |
|---|---|---|---|---|---|
| 27 Jun | 28.7 °C | 65 % | 26 km/h | 0.6 mm | Very low 4 |
| 28 Jun | 27.2 °C | 65 % | 26 km/h | 0.8 mm | Very low 4 |
| 29 Jun after | 29.0 °C | 61 % | 24 km/h | 0.3 mm | Low 5 |
| 30 Jun after | 26.3 °C | 71 % | 26 km/h | 0.9 mm | Very low 3 |
| 1 Jul after | 29.0 °C | 66 % | 22 km/h | 4.0 mm | Very low 1 |
Its twins: fires that started in the same weather
It started with an FWI of 3.6, a minimum humidity of 65% and 1 day without rain. Fires in the area that started in weather like this since 2016: 20.
FWI at the start
3.6
Minimum humidity
65 %
Days without rain
1
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Okoyo fire, June 2023
1,051 ha
2 days
FWI 3.6
Min. humidity 65 %
Plateaux fire, August 2023
1,263 ha
3 days
FWI 3.8
Min. humidity 64 %
35 km away, in 2023
First rain (1 mm or more) after it ended: 1.5 mm on 24 Aug.
Djambala fire, July 2019
1,706 ha
3 days
FWI 3.6
Min. humidity 65 %
140 km away, in 2019
First rain (1 mm or more) after it ended: 2.8 mm on 3 Aug.
Plateaux fire, July 2023
1,040 ha
4 days
FWI 5.3
Min. humidity 65 %
53 km away, in 2023
First rain (1 mm or more) after it ended: 1.1 mm on 16 Jul.
Lékana fire, August 2022
2,853 ha
2 days
FWI 2.0
Min. humidity 65 %
67 km away, in 2022
First rain (1 mm or more) after it ended: 1.1 mm on 29 Aug.
Okoyo fire, June 2016
1,977 ha
2 days
FWI 3.5
Min. humidity 65 %
32 km away, in 2016
First rain (1 mm or more) after it ended: 1.9 mm on 25 Jun.
What happened to them
- 3 days
- median duration
- 1,532 ha
- median area
- 100 %
- went past 1,000 ha
- 1.9 mm
- rain at the end (median; 14 of 20 had it)
It burned an area similar to its twins (1,051 ha against a median of 1,532 ha) and lasted 2 days, against 3 days.
In 6 of 20, 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
4.0 mmfirst rain
1 Jul3 days after it ended
26km/h · max. gust
It was considered over on 28 Jun, and on 1 Jul 4.0 mm fell. We do not know whether the rain or the firefighters put it out. Twins with rain when they ended: 14 of 20, 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 · 20 Jun 2023
After · 5 Jul 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 25 June 2023 the air beside the fire reached 40 µg/m³ of PM2.5. That day averaged 30: 2.0 times the WHO daily guideline (15).
PM2.5 peak40 µg/m³
Days over the guideline6 days
PM1058 µg/m³
Optical depth1.12
WHO 15
25 Jun27 Jun29 Jun1 Jul
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 · 10Every 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 Okoyo fire last?
- GWIS (Copernicus) dates it between 27 June 2023 and 28 June 2023: 2 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 1,051 hectares (10.5 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Okoyo (1,058 ha, 0.2 %).
- What was the weather like?
- During the fire the temperature reached 28.7 °C, humidity dropped to 65 % and gusts hit 26 km/h. The fire danger index (FWI) reached 4, class Very 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: 20. Their median duration was 3 days and their median area 1,532 ha; 100 % went past 1,000 ha. In 6 of 20, 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. 10 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.