Calai fire, August 2021 Calai
The fire started on 26 August 2021 in Calai, Angola, and satellites saw it burning for 19 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 11,008 hectares from heat detections, spread across a single municipality.
It is the 160th largest in Cuando Cubango since 2016 (of 659 with a page). Number 27 in Angola in 2021, of 126.
- Burnt area
- 11,008ha
- GWIS perimeter (Copernicus)
- Duration
- 19days
- 26 Aug 2021 – 13 Sept 2021
- Municipalities hit
- 1
- municipalities
- Started on
- 26 Aug
- 2021
- Heat detections
- 477
- in a single hotspot: 191 MW
- Danger at start
- 50
- Extreme · FWI index
- Energy released
- 5.6GW
- sum of detected power
Where it burned
How it evolved, day by day
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
It had gone more than two months without rain (1 mm or more) when it started.
This area had burned before
39% of the perimeter overlaps earlier fires recorded since 2016: 1,087 ha in 2016, 2,734 ha in 2018, 575 ha in 2019, 223 ha in 2020. Part of it burned more than once, so the yearly figures add up to more than the 4,330 ha that had burned before.
What happened to each town
-
Calai where it started11,047 ha reached on 26 Aug1.4 %
Burnt area inside each municipality, from crossing the GWIS perimeter with administrative boundaries. The distance is from the town centre 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) |
|---|---|---|---|---|---|
| 26 Aug | 33.5 °C | 18 % | 37 km/h | 0.0 mm | Extreme 50 |
| 27 Aug | 33.6 °C | 16 % | 31 km/h | 0.0 mm | Very high 47 |
| 28 Aug | 27.2 °C | 16 % | 46 km/h | 0.0 mm | Extreme 57 |
| 29 Aug | 26.2 °C | 13 % | 37 km/h | 0.0 mm | Extreme 52 |
| 30 Aug | 31.5 °C | 14 % | 29 km/h | 0.0 mm | Very high 45 |
| 31 Aug | 32.7 °C | 12 % | 24 km/h | 0.0 mm | Very high 44 |
| 1 Sept | 32.7 °C | 13 % | 39 km/h | 0.0 mm | Extreme 53 |
| 2 Sept | 32.9 °C | 12 % | 41 km/h | 0.0 mm | Extreme 55 |
| 3 Sept | 31.8 °C | 14 % | 39 km/h | 0.0 mm | Extreme 54 |
| 4 Sept | 33.3 °C | 13 % | 32 km/h | 0.0 mm | Extreme 51 |
| 5 Sept | 34.2 °C | 14 % | 35 km/h | 0.0 mm | Extreme 52 |
| 6 Sept | 34.6 °C | 15 % | 36 km/h | 0.0 mm | Extreme 52 |
| 7 Sept | 33.9 °C | 14 % | 25 km/h | 0.0 mm | Very high 49 |
| 8 Sept | 34.8 °C | 14 % | 38 km/h | 0.0 mm | Extreme 54 |
| 9 Sept | 33.0 °C | 18 % | 42 km/h | 0.0 mm | Extreme 56 |
| 10 Sept | 31.9 °C | 18 % | 55 km/h | 0.0 mm | Extreme 66 |
| 11 Sept | 30.2 °C | 19 % | 48 km/h | 0.0 mm | Extreme 58 |
| 12 Sept | 29.7 °C | 21 % | 44 km/h | 0.0 mm | Extreme 52 |
| 13 Sept | 31.5 °C | 15 % | 29 km/h | 0.0 mm | Very high 43 |
| 14 Sept after | 33.6 °C | 10 % | 29 km/h | 0.0 mm | Very high 48 |
| 15 Sept after | 35.0 °C | 11 % | 29 km/h | 0.0 mm | Very high 48 |
| 16 Sept after | 35.3 °C | 12 % | 35 km/h | 0.0 mm | Extreme 53 |
| 17 Sept after | 34.0 °C | 11 % | 40 km/h | 0.0 mm | Extreme 57 |
| 18 Sept after | 34.9 °C | 12 % | 38 km/h | 0.0 mm | Extreme 55 |
| 19 Sept after | 33.2 °C | 20 % | 42 km/h | 0.0 mm | Extreme 56 |
| 20 Sept after | 33.6 °C | 20 % | 27 km/h | 0.0 mm | Very high 46 |
| 21 Sept after | 35.5 °C | 14 % | 32 km/h | 0.0 mm | Very high 47 |
| 22 Sept after | 35.8 °C | 13 % | 41 km/h | 0.0 mm | Extreme 56 |
| 23 Sept after | 35.0 °C | 13 % | 42 km/h | 0.0 mm | Extreme 57 |
| 24 Sept after | 34.6 °C | 13 % | 40 km/h | 0.0 mm | Extreme 56 |
| 25 Sept after | 34.1 °C | 12 % | 45 km/h | 0.0 mm | Extreme 60 |
| 26 Sept after | 34.0 °C | 10 % | 40 km/h | 0.0 mm | Extreme 56 |
| 27 Sept after | 35.1 °C | 10 % | 39 km/h | 0.0 mm | Extreme 57 |
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
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 · 477Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
Frequently asked questions
- How long did the Calai fire last?
- GWIS (Copernicus) dates it between 26 August 2021 and 13 September 2021: 19 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 11,008 hectares (110.1 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Calai (11,047 ha, 1.4 %).
- What was the weather like?
- During the fire the temperature reached 35.3 °C, humidity dropped to 10 % and gusts hit 55 km/h. The fire danger index (FWI) reached 66, class Extreme.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Angola (geoBoundaries). It is not an official report.
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
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
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 (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.