Burned area
satellite only1,009ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 21 Aug 2021 – 21 Aug 2021
+− cross-check
No official record is matched to this page to compare it with.
CG · Republic of the Congo ·
Mouyondzi fire, 21 August 2021 Mouyondzi, Madingou
Out · last measured on 21 Aug 2021
The fire started on 21 August 2021 in Mouyondzi, Republic of the Congo, and satellites saw it burning for 1 day. Copernicus’s global GWIS system rebuilt a burnt perimeter of 1,009 hectares from heat detections, spread across 2 municipalities.
It is the 92th largest in Bouenza since 2016 (of 94 with a page). Number 50 in Republic of the Congo in 2021, of 50.
Use this data
Compare with…
Use this data
Fire page data · version 2026-11-05matches 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 only1day
21 Aug 2021 to 21 Aug 2021: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 21 Aug 2021 – 21 Aug 2021
+− 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 only21 Aug 2021
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 21 Aug 2021
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Danger at the start
model18.0FWI · moderate
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 4.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 21 Aug 2021, 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
model31.0°C · 44% RH
High of 31.0 °C and minimum humidity of 44% on 21 August 2021; gusts of 28 km/h on 21 August 2021.
- Source
- weather model at the fire’s grid cell
- Date
- 21 Aug 2021 – 21 Aug 2021
- 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
-
logName: Impfondo → Mouyondzi.
-
· reconstructed weatherWeather and FWI computed from the ERA5 reanalysis
What was saved on 5 November 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
- 1,009 ha
- Dates
- 21 Aug 2021 – 21 Aug 2021
- Name
- Mouyondzi
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/mouyondzi-2021-08?v=2026-11-05A 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 mouyondzi-2021-08.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021-08-21 | 0 | 0 | 31 | 18.9 | 44 | 10.9 | 28.4 | 0 | 18 | moderado | 1 |
| 2021-08-22 | 0 | 0 | 28 | 20.2 | 59 | 8.7 | 19.4 | 0 | 15.7 | moderado | 0 |
| 2021-08-23 | 0 | 0 | 28.8 | 20.8 | 58 | 10.7 | 23 | 0 | 16.8 | moderado | 0 |
| 2021-08-24 | 0 | 0 | 28.6 | 20.6 | 55 | 8.7 | 24.1 | 0 | 16.1 | moderado | 0 |
| 2021-08-25 | 0 | 0 | 33 | 20.6 | 45 | 12.7 | 25.2 | 0 | 20.7 | moderado | 0 |
| 2021-08-26 | 0 | 0 | 28.5 | 21.8 | 61 | 9.9 | 22.3 | 0 | 16.5 | moderado | 0 |
| 2021-08-27 | 0 | 0 | 28.1 | 21.6 | 60 | 10.5 | 27 | 0 | 16.6 | moderado | 0 |
| 2021-08-28 | 0 | 0 | 28.4 | 22 | 58 | 10.7 | 25.2 | 0 | 16.9 | moderado | 0 |
| 2021-08-29 | 0 | 0 | 29.2 | 21.9 | 54 | 10 | 25.2 | 0 | 16.8 | moderado | 0 |
| 2021-08-30 | 0 | 0 | 31.6 | 21 | 47 | 13.7 | 32 | 0 | 20.9 | moderado | 0 |
| 2021-08-31 | 0 | 0 | 28.4 | 21 | 61 | 9.3 | 28.1 | 0 | 16.7 | 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). Open-Meteo.com · How we build fire pages: methodology
We have the GWIS perimeter for this fire, but the VIIRS sensors did not capture it in enough detail: no day-by-day evolution, but the split by municipality is there.
- Burnt area
- 1,009ha
- GWIS perimeter (Copernicus)
- Duration
- 1day
- 21 Aug 2021 – 21 Aug 2021
- Municipalities hit
- 2
- districts
- Started on
- 21 Aug
- 2021
- Danger at start
- 18
- Moderate · FWI index
Where it burned
The weather it burned in
31°high
28km/h · peak gust
44%lowest humidity
It had gone 4 days without rain (1 mm or more) when it started.
This area had burned before
42% of the perimeter overlaps earlier fires recorded since 2016: 278 ha in 2016, 304 ha in 2018. Part of it burned more than once, so the yearly figures add up to more than the 422 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
-
Mouyondzi where it started917 ha0.2 %
-
99 ha0.1 %
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.
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) |
|---|---|---|---|---|---|
| 21 Aug | 31.0 °C | 44 % | 28 km/h | 0.0 mm | Moderate 18 |
| 22 Aug after | 28.0 °C | 59 % | 19 km/h | 0.0 mm | Moderate 16 |
| 23 Aug after | 28.8 °C | 58 % | 23 km/h | 0.0 mm | Moderate 17 |
| 24 Aug after | 28.6 °C | 55 % | 24 km/h | 0.0 mm | Moderate 16 |
| 25 Aug after | 33.0 °C | 45 % | 25 km/h | 0.0 mm | Moderate 21 |
| 26 Aug after | 28.5 °C | 61 % | 22 km/h | 0.0 mm | Moderate 16 |
| 27 Aug after | 28.1 °C | 60 % | 27 km/h | 0.0 mm | Moderate 17 |
| 28 Aug after | 28.4 °C | 58 % | 25 km/h | 0.0 mm | Moderate 17 |
| 29 Aug after | 29.2 °C | 54 % | 25 km/h | 0.0 mm | Moderate 17 |
| 30 Aug after | 31.6 °C | 47 % | 32 km/h | 0.0 mm | Moderate 21 |
| 31 Aug after | 28.4 °C | 61 % | 28 km/h | 0.0 mm | Moderate 17 |
Its twins: fires that started in the same weather
It started with an FWI of 18.0, a minimum humidity of 44% and 4 days without rain. Fires in the area that started in weather like this since 2016: 29.
FWI at the start
18.0
Minimum humidity
44 %
Days without rain
4
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Mouyondzi fire, 21 August 2021
1,009 ha
1 day
FWI 18.0
Min. humidity 44 %
Sibiti fire, August 2022
1,300 ha
4 days
FWI 18.1
Min. humidity 44 %
41 km away, in 2022
First rain (1 mm or more) after it ended: 3.3 mm on 1 Sept.
Mouyondzi fire, September 2022
2,550 ha
2 days
FWI 14.8
Min. humidity 44 %
24 km away, in 2022
First rain (1 mm or more) after it ended: 5.0 mm on 15 Sept.
Mouyondzi fire, September 2022
1,243 ha
1 day
FWI 18.3
Min. humidity 42 %
31 km away, in 2022
First rain (1 mm or more) after it ended: 1.7 mm on 15 Sept.
Kimongo fire, July 2017
1,439 ha
11 days
FWI 16.2
Min. humidity 44 %
68 km away, in 2017
First rain (1 mm or more) after it ended: none in the following ten days.
Zanaga fire, August 2022
1,146 ha
4 days
FWI 17.1
Min. humidity 46 %
90 km away, in 2022
First rain (1 mm or more) after it ended: 1.3 mm on 1 Sept.
What happened to them
- 4 days
- median duration
- 1,300 ha
- median area
- 100 %
- went past 1,000 ha
- 1.7 mm
- rain at the end (median; 27 of 29 had it)
It burned an area similar to its twins (1,009 ha against a median of 1,300 ha) and lasted 1 day, against 4 days.
In 2 of 29, 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 1.7 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
28km/h · max. gust
It was considered over on 21 Aug, and not even 1 mm fell in the following ten days: it went out without rain. Twins with rain when they ended: 27 of 29, with a median of 1.7 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 · 14 Aug 2021
After · 28 Aug 2021
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.
Other fires nearby
- 4,055 haMouyondzi14 September 2026 · 15 days · 7 km away
- 4,700 haMouyondzi1 September 2026 · 10 days · 12 km away
- 6,651 haMouyondzi2 September 2026 · 14 days · 18 km away
- 4,434 haMouyondzi14 September 2025 · 7 days · 24 km away
- 4,876 haMouyondzi7 September 2026 · 9 days · 26 km away
- 7,192 haMouyondzi1 September 2026 · 15 days · 33 km away
Frequently asked questions
- How long did the Mouyondzi fire last?
- GWIS (Copernicus) dates it between 21 August 2021 and 21 August 2021: 1 day 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 1,009 hectares (10.1 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 2 municipalities: Mouyondzi (917 ha, 0.2 %); Madingou (99 ha, 0.1 %).
- What was the weather like?
- During the fire the temperature reached 31.0 °C, humidity dropped to 44 % and gusts hit 28 km/h. The fire danger index (FWI) reached 18, 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: 29. Their median duration was 4 days and their median area 1,300 ha; 100 % went past 1,000 ha. In 2 of 29, 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 1.7 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.
- Name: Impfondo → Mouyondzi.
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. No 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.