Burned area
satellite only1,541ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 2 Aug 2023 – 10 Aug 2023
+− cross-check
No official record is matched to this page to compare it with.
CG · Republic of the Congo · –
Mayama fire, 2 August 2023 Mayama
Out · last detection 9 Aug 2023, 12:20 UTC
The fire started on 2 August 2023 in Mayama, Republic of the Congo, and satellites saw it burning for 9 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 1,541 hectares from heat detections, spread across a single municipality.
It is the 64th largest in Pool since 2016 (of 202 with a page). Number 12 in Republic of the Congo in 2023, of 40.
The power measured by the satellite is low (14.3 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: Mayama · 2018Mayama · 2016Mayama · 2019Mayama · 2018
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
2 Aug 2023 to 10 Aug 2023: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 9 Aug 2023, 12:20 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 only2 Aug 2023
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 2 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 only32
VIIRS detections at 375 m. Most intense hotspot: 14 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 2 Aug 2023 – 10 Aug 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 only94MW
Total radiative power on 2 August 2023; hotspots that day: 11.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 2 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
model16.0FWI · moderate
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 45.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 2 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
model29.4°C · 46% RH
High of 29.4 °C and minimum humidity of 46% on 8 August 2023; gusts of 34 km/h on 6 August 2023.
- Source
- weather model at the fire’s grid cell
- Date
- 2 Aug 2023 – 10 Aug 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
-
logLast day with fire: 5 August 2023 → 10 August 2023.
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
- 1,541 ha
- Dates
- 2 Aug 2023 – 10 Aug 2023
- Name
- Mvouti
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/mayama-2023-08?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 mayama-2023-08.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023-08-02 | 11 | 94 | 25.7 | 17.7 | 61 | 12.1 | 28.4 | 0 | 16 | moderado | 1 |
| 2023-08-03 | 6 | 24 | 27.7 | 18.1 | 52 | 9.5 | 25.9 | 0 | 15.4 | moderado | 1 |
| 2023-08-04 | 5 | 21 | 28.3 | 18 | 54 | 7.9 | 28.4 | 0 | 14.9 | moderado | 1 |
| 2023-08-05 | 4 | 12 | 28.5 | 19.1 | 52 | 10.7 | 25.2 | 0.1 | 16.5 | moderado | 1 |
| 2023-08-06 | 0 | 0 | 25.8 | 18.8 | 57 | 14.6 | 33.8 | 0 | 18.6 | moderado | 1 |
| 2023-08-07 | 0 | 0 | 26 | 16.7 | 57 | 12.8 | 30.2 | 0 | 17.9 | moderado | 1 |
| 2023-08-08 | 2 | 7 | 29.4 | 17.1 | 46 | 9.9 | 27.4 | 0 | 18.4 | moderado | 1 |
| 2023-08-09 | 4 | 17 | 26 | 19.3 | 57 | 14.5 | 32.8 | 0 | 19.7 | moderado | 1 |
| 2023-08-10 | 0 | 0 | 28.4 | 17.6 | 54 | 7.4 | 22.3 | 0.3 | 16.4 | moderado | 1 |
| 2023-08-11 | 0 | 0 | 28.3 | 20.2 | 57 | 12.6 | 27.4 | 0.6 | 16.1 | moderado | 0 |
| 2023-08-12 | 0 | 0 | 29.1 | 20 | 54 | 8.2 | 21.2 | 0.3 | 15.4 | moderado | 0 |
| 2023-08-13 | 0 | 0 | 25.6 | 19.9 | 63 | 13 | 30.6 | 0 | 17 | moderado | 0 |
| 2023-08-14 | 0 | 0 | 28 | 19.2 | 56 | 11.6 | 27 | 0 | 16.6 | moderado | 0 |
| 2023-08-15 | 0 | 0 | 28.8 | 18 | 49 | 10 | 24.1 | 0 | 17.9 | moderado | 0 |
| 2023-08-16 | 0 | 0 | 30.4 | 18.7 | 46 | 6.9 | 18.7 | 0 | 18.1 | moderado | 0 |
| 2023-08-17 | 0 | 0 | 26.9 | 19.8 | 59 | 11.5 | 26.3 | 0.2 | 18.7 | moderado | 0 |
| 2023-08-18 | 0 | 0 | 27.1 | 19.7 | 58 | 13.4 | 32.8 | 0.1 | 19.9 | moderado | 0 |
| 2023-08-19 | 0 | 0 | 29.1 | 19.8 | 54 | 11.4 | 27 | 0.1 | 19 | moderado | 0 |
| 2023-08-20 | 0 | 0 | 28.7 | 18.7 | 48 | 10.7 | 24.5 | 0 | 19.4 | 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). Open-Meteo.com · How we build fire pages: methodology
- Burnt area
- 1,541ha
- GWIS perimeter (Copernicus)
- Duration
- 9days
- 2 Aug 2023 – 10 Aug 2023
- Municipalities hit
- 1
- districts
- Started on
- 2 Aug
- 2023
- Heat detections
- 32
- in a single hotspot: 14 MW
- Danger at start
- 16
- Moderate · FWI index
- Average daily power
- 29MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
2 Aug10 Aug
9 Aug 2023
How it evolved, day by day
2 Aug
4 Aug
8 Aug
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
34km/h · peak gust
46%lowest humidity
It had gone 45 days without rain (1 mm or more) when it started.
This area had burned before
46% of the perimeter overlaps earlier fires recorded since 2016: 353 ha in 2018, 453 ha in 2019. Part of it burned more than once, so the yearly figures add up to more than the 708 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
-
Mayama where it started1,550 ha reached on 2 Aug0.2 %
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) |
|---|---|---|---|---|---|
| 2 Aug | 25.7 °C | 61 % | 28 km/h | 0.0 mm | Moderate 16 |
| 3 Aug | 27.7 °C | 52 % | 26 km/h | 0.0 mm | Moderate 15 |
| 4 Aug | 28.3 °C | 54 % | 28 km/h | 0.0 mm | Moderate 15 |
| 5 Aug | 28.5 °C | 52 % | 25 km/h | 0.1 mm | Moderate 16 |
| 6 Aug | 25.8 °C | 57 % | 34 km/h | 0.0 mm | Moderate 19 |
| 7 Aug | 26.0 °C | 57 % | 30 km/h | 0.0 mm | Moderate 18 |
| 8 Aug | 29.4 °C | 46 % | 27 km/h | 0.0 mm | Moderate 18 |
| 9 Aug | 26.0 °C | 57 % | 33 km/h | 0.0 mm | Moderate 20 |
| 10 Aug | 28.4 °C | 54 % | 22 km/h | 0.3 mm | Moderate 16 |
| 11 Aug after | 28.3 °C | 57 % | 27 km/h | 0.6 mm | Moderate 16 |
| 12 Aug after | 29.1 °C | 54 % | 21 km/h | 0.3 mm | Moderate 15 |
| 13 Aug after | 25.6 °C | 63 % | 31 km/h | 0.0 mm | Moderate 17 |
| 14 Aug after | 28.0 °C | 56 % | 27 km/h | 0.0 mm | Moderate 17 |
| 15 Aug after | 28.8 °C | 49 % | 24 km/h | 0.0 mm | Moderate 18 |
| 16 Aug after | 30.4 °C | 46 % | 19 km/h | 0.0 mm | Moderate 18 |
| 17 Aug after | 26.9 °C | 59 % | 26 km/h | 0.2 mm | Moderate 19 |
| 18 Aug after | 27.1 °C | 58 % | 33 km/h | 0.1 mm | Moderate 20 |
| 19 Aug after | 29.1 °C | 54 % | 27 km/h | 0.1 mm | Moderate 19 |
| 20 Aug after | 28.7 °C | 48 % | 24 km/h | 0.0 mm | Moderate 19 |
Its twins: fires that started in the same weather
It started with an FWI of 16.0, a minimum humidity of 61% and 45 days without rain. Fires in the area that started in weather like this since 2016: 15.
FWI at the start
16.0
Minimum humidity
61 %
Days without rain
45
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Mayama fire, 2 August 2023
1,541 ha
9 days
FWI 16.0
Min. humidity 61 %
Mayama fire, August 2018
1,177 ha
3 days
FWI 17.6
Min. humidity 60 %
18 km away, in 2018
First rain (1 mm or more) after it ended: 1.0 mm on 24 Aug.
Mayama fire, July 2016
1,279 ha
3 days
FWI 13.5
Min. humidity 62 %
41 km away, in 2016
First rain (1 mm or more) after it ended: none in the following ten days.
Mayama fire, July 2024
2,086 ha
1 day
FWI 15.6
Min. humidity 59 %
61 km away, in 2024
First rain (1 mm or more) after it ended: none in the following ten days.
Mayama fire, July 2017
1,054 ha
4 days
FWI 12.2
Min. humidity 62 %
56 km away, in 2017
First rain (1 mm or more) after it ended: none in the following ten days.
Mayama fire, July 2024
16,420 ha
11 days
FWI 18.7
Min. humidity 59 %
52 km away, in 2024
First rain (1 mm or more) after it ended: none in the following ten days.
What happened to them
- 4 days
- median duration
- 1,253 ha
- median area
- 100 %
- went past 1,000 ha
- 1.3 mm
- rain at the end (median; 5 of 15 had it)
It burned an area similar to its twins (1,541 ha against a median of 1,253 ha) and lasted 9 days, against 4 days.
In 10 of 15, 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 1.3 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
—first rain
—no rain in ten days
34km/h · max. gust
It was considered over on 10 Aug, and not even 1 mm fell in the following ten days: it went out without rain. Twins with rain when they ended: 5 of 15, with a median of 1.3 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 · 26 Jul 2023
After · 17 Aug 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 31 July 2023 the air beside the fire reached 72 µg/m³ of PM2.5. That day averaged 32: 2.1 times the WHO daily guideline (15).
PM2.5 peak72 µg/m³
Days over the guideline9 days
PM10103 µg/m³
Optical depth1.48
WHO 15
31 Jul2 Aug4 Aug6 Aug8 Aug
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 · 32Every 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 Mayama fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 2 August 2023 to 10 August 2023 (9 days). The perimeter dates it from 2 August 2023 to 5 August 2023.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 1,541 hectares (15.4 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Mayama (1,550 ha, 0.2 %).
- What was the weather like?
- During the fire the temperature reached 29.4 °C, humidity dropped to 46 % and gusts hit 34 km/h. The fire danger index (FWI) reached 20, class Moderate.
- 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: 15. Their median duration was 4 days and their median area 1,253 ha; 100 % went past 1,000 ha. In 10 of 15, 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 1.3 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 · 1 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
- Last day with fire: 5 August 2023 → 10 August 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 2 August 2023 to 5 August 2023. 32 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.