Burned area
satellite only1,032ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 20 Aug 2021 – 21 Aug 2021
+− cross-check
No official record is matched to this page to compare it with.
CG · Republic of the Congo · –
Sibiti fire, August 2021 Sibiti
Out · last detection 21 Aug 2021, 13:22 UTC
The fire started on 20 August 2021 in Sibiti, Republic of the Congo, and satellites saw it burning for 2 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 23th largest in Lékoumou since 2016 (of 24 with a page). Number 45 in Republic of the Congo in 2021, of 50.
The power measured by the satellite is low (25.8 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 2026-11-05matches 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 only2days
20 Aug 2021 to 21 Aug 2021: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 21 Aug 2021, 13:22 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 only20 Aug 2021
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 20 Aug 2021
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only16
VIIRS detections at 375 m. Most intense hotspot: 26 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 20 Aug 2021 – 21 Aug 2021
+− 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 only142MW
Total radiative power on 21 August 2021; hotspots that day: 16.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 21 Aug 2021
+− 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
model13.1FWI · moderate
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 3.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 20 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
model30.4°C · 46% RH
High of 30.4 °C and minimum humidity of 46% on 21 August 2021; gusts of 25 km/h on 21 August 2021.
- Source
- weather model at the fire’s grid cell
- Date
- 20 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: Divénié → Sibiti.
-
· 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
- 1,032 ha
- Dates
- 20 Aug 2021 – 21 Aug 2021
- Name
- Sibiti
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/sibiti-2021-08-2?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 sibiti-2021-08-2.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021-08-20 | 0 | 0 | 27.9 | 20.6 | 56 | 9.8 | 22.7 | 0 | 13.1 | moderado | 1 |
| 2021-08-21 | 16 | 142 | 30.4 | 17.8 | 46 | 11.8 | 25.2 | 0 | 17.9 | moderado | 1 |
| 2021-08-22 | 0 | 0 | 27.3 | 19.7 | 61 | 9.1 | 20.2 | 0 | 15.2 | moderado | 0 |
| 2021-08-23 | 0 | 0 | 28.6 | 19.4 | 58 | 11.2 | 23.8 | 0 | 16.3 | moderado | 0 |
| 2021-08-24 | 0 | 0 | 27.2 | 19.7 | 59 | 8 | 22.3 | 0 | 15.1 | moderado | 0 |
| 2021-08-25 | 0 | 0 | 31.1 | 20.3 | 46 | 11.5 | 25.9 | 0 | 19.1 | moderado | 0 |
| 2021-08-26 | 0 | 0 | 28.2 | 21.3 | 60 | 10.1 | 19.1 | 0.2 | 16.7 | moderado | 0 |
| 2021-08-27 | 0 | 0 | 28.5 | 20.6 | 59 | 10.5 | 24.8 | 0.3 | 17.1 | moderado | 0 |
| 2021-08-28 | 0 | 0 | 28.6 | 20.7 | 56 | 10.7 | 26.6 | 0 | 17.5 | moderado | 0 |
| 2021-08-29 | 0 | 0 | 28.7 | 21.4 | 54 | 10.5 | 21.2 | 0.1 | 17.6 | moderado | 0 |
| 2021-08-30 | 0 | 0 | 28.5 | 20.1 | 55 | 12 | 28.4 | 0 | 18.5 | moderado | 0 |
| 2021-08-31 | 0 | 0 | 27.4 | 20 | 65 | 8.9 | 22.3 | 0.1 | 15 | 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
- 1,032ha
- GWIS perimeter (Copernicus)
- Duration
- 2days
- 20 Aug 2021 – 21 Aug 2021
- Municipalities hit
- 1
- districts
- Started on
- 20 Aug
- 2021
- Heat detections
- 16
- in a single hotspot: 26 MW
- Danger at start
- 13
- Moderate · FWI index
- Average daily power
- 142MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
20 Aug21 Aug
How it evolved, day by day
21 Aug 2021 · 142 MW · 16
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
30°high
25km/h · peak gust
46%lowest humidity
It had gone 3 days without rain (1 mm or more) when it started.
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
-
Sibiti where it started1,039 ha reached on 21 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.
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) |
|---|---|---|---|---|---|
| 20 Aug | 27.9 °C | 56 % | 23 km/h | 0.0 mm | Moderate 13 |
| 21 Aug | 30.4 °C | 46 % | 25 km/h | 0.0 mm | Moderate 18 |
| 22 Aug after | 27.3 °C | 61 % | 20 km/h | 0.0 mm | Moderate 15 |
| 23 Aug after | 28.6 °C | 58 % | 24 km/h | 0.0 mm | Moderate 16 |
| 24 Aug after | 27.2 °C | 59 % | 22 km/h | 0.0 mm | Moderate 15 |
| 25 Aug after | 31.1 °C | 46 % | 26 km/h | 0.0 mm | Moderate 19 |
| 26 Aug after | 28.2 °C | 60 % | 19 km/h | 0.2 mm | Moderate 17 |
| 27 Aug after | 28.5 °C | 59 % | 25 km/h | 0.3 mm | Moderate 17 |
| 28 Aug after | 28.6 °C | 56 % | 27 km/h | 0.0 mm | Moderate 18 |
| 29 Aug after | 28.7 °C | 54 % | 21 km/h | 0.1 mm | Moderate 18 |
| 30 Aug after | 28.5 °C | 55 % | 28 km/h | 0.0 mm | Moderate 18 |
| 31 Aug after | 27.4 °C | 65 % | 22 km/h | 0.1 mm | Moderate 15 |
Its twins: fires that started in the same weather
It started with an FWI of 13.1, a minimum humidity of 56% and 3 days without rain. Fires in the area that started in weather like this since 2016: 17.
FWI at the start
13.1
Minimum humidity
56 %
Days without rain
3
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Sibiti fire, August 2021
1,032 ha
2 days
FWI 13.1
Min. humidity 56 %
Sibiti fire, September 2019
1,051 ha
2 days
FWI 12.5
Min. humidity 56 %
60 km away, in 2019
First rain (1 mm or more) after it ended: 2.1 mm on 16 Sept.
Mouyondzi fire, September 2018
2,344 ha
7 days
FWI 10.9
Min. humidity 56 %
89 km away, in 2018
First rain (1 mm or more) after it ended: 4.1 mm on 22 Sept.
Mayama fire, July 2017
2,385 ha
13 days
FWI 13.1
Min. humidity 55 %
240 km away, in 2017
First rain (1 mm or more) after it ended: none in the following ten days.
Sibiti fire, September 2016
1,252 ha
4 days
FWI 11.6
Min. humidity 54 %
87 km away, in 2016
First rain (1 mm or more) after it ended: 1.8 mm on 11 Sept.
Mongo fire, August 2024
2,083 ha
2 days
FWI 10.5
Min. humidity 56 %
150 km away, in 2024
First rain (1 mm or more) after it ended: 1.1 mm on 7 Aug.
What happened to them
- 4 days
- median duration
- 1,394 ha
- median area
- 100 %
- went past 1,000 ha
- 2.1 mm
- rain at the end (median; 12 of 17 had it)
It burned an area similar to its twins (1,032 ha against a median of 1,394 ha) and lasted 2 days, against 4 days.
In 5 of 17, 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 2.1 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
25km/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: 12 of 17, with a median of 2.1 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 · 13 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.
Detections table · 16Every 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 Sibiti fire last?
- GWIS (Copernicus) dates it between 20 August 2021 and 21 August 2021: 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 1,032 hectares (10.3 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Sibiti (1,039 ha, 0.1 %).
- What was the weather like?
- During the fire the temperature reached 30.4 °C, humidity dropped to 46 % and gusts hit 25 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: 17. Their median duration was 4 days and their median area 1,394 ha; 100 % went past 1,000 ha. In 5 of 17, 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 2.1 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: Divénié → Sibiti.
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. 16 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.