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AO · Angola · –

Nancova fire, 26 August 2023 Nancova

Out · last detection 12 Sept 2023, 11:38 UTC

The fire started on 26 August 2023 in Nancova, Angola, and satellites saw it burning for 18 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 7,792 hectares from heat detections, spread across a single municipality.

It is the 238th largest in Cuando Cubango since 2016 (of 504 with a page). Number 52 in Angola in 2023, of 158.

Compare with…

Suggestions: Mavinga · 2019Mavinga · 2019Nancova · 2021Nancova · 2021

Burnt area
7,792ha
GWIS perimeter (Copernicus)
Duration
18days
26 Aug 2023 – 12 Sept 2023
Municipalities hit
1
municipalities
Started on
26 Aug
2023
Heat detections
329
in a single hotspot: 78 MW
Danger at start
52
Extreme · FWI index
Average daily power
202MW
detected power per day, on average

Where it burned

HOTSPOTS BY DAY 26 Aug12 Sept
12 Sept 2023

How it evolved, day by day

26 Aug 2023 · 10 MW · 6 27 Aug 2023 · 61 MW · 9 28 Aug 2023 · 2 MW · 3 29 Aug 2023 · 78 MW · 14 30 Aug 2023 · 243 MW · 27 31 Aug 2023 · 495 MW · 43 1 Sept 2023 · 564 MW · 40 2 Sept 2023 · 855 MW · 81 3 Sept 2023 · 599 MW · 44 4 Sept 2023 · 347 MW · 8 5 Sept 2023 · 16 MW · 2 6 Sept 2023 · 14 MW · 2 7 Sept 2023 · 37 MW · 5 8 Sept 2023 · 19 MW · 3 9 Sept 2023 · 33 MW · 6 10 Sept 2023 · 19 MW · 4 11 Sept 2023 · 198 MW · 15 12 Sept 2023 · 48 MW · 17
26 Aug 30 Aug 2 Sept 7 Sept 11 Sept

Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.

The weather it burned in

34°high
53km/h · peak gust
9%lowest humidity

It had gone more than two months without rain (1 mm or more) when it started.

This area had burned before

86% of the perimeter overlaps earlier fires recorded since 2016: 5,052 ha in 2018, 5,098 ha in 2021, 59 ha in 2022. Part of it burned more than once, so the yearly figures add up to more than the 6,705 ha that had burned before.

How big is it?

10 km
It burned the equivalent of 4.9% of the area of London (78 km² against 1,583 km²).

London boundary: geoBoundaries · Office for National Statistics (Open Government Licence v3.0).

This compares size, not location: both shapes are at the same scale, north up, centred on each other.

What happened to each town

  1. Nancova where it started
    7,823 ha reached on 26 Aug
    0.8 %

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.

People and buildings inside the perimeter

GHSL 2025
Built-up area< 0.1 ha
Residents< 20

Inside the perimeter there was no noticeable built-up land and almost nobody lived there (GHSL 2025, satellite-based estimate).

This is an estimate on 100 m cells, made from satellite imagery and census data: it does not mean that homes burned or that anyone was harmed. The perimeter also contains land that never burned. The GHSL 2025 epoch is a projection made from 2020 and earlier data.

Source: Global Human Settlement Layer (GHS-BUILT-S and GHS-POP R2023A), European Commission Joint Research Centre (JRC), © European Union, CC BY 4.0. Sum inside the perimeter computed by WorldFires. human-settlement.emergency.copernicus.eu

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)

Started with Very dry air: 41 % of the area in Angola 60 days without rain: 84 % of the area in Angola

Day High Min. humidity Peak gust Rain Danger (FWI)
26 Aug 33.5 °C 13 % 28 km/h 0.0 mm Extreme 52
27 Aug 31.1 °C 14 % 38 km/h 0.0 mm Extreme 58
28 Aug 29.3 °C 23 % 53 km/h 0.2 mm Extreme 57
29 Aug 28.8 °C 23 % 43 km/h 0.0 mm Very high 48
30 Aug 28.1 °C 19 % 40 km/h 0.0 mm Very high 47
31 Aug 29.9 °C 13 % 33 km/h 0.0 mm Very high 44
1 Sept 32.2 °C 11 % 33 km/h 0.0 mm Very high 48
2 Sept 33.0 °C 9 % 34 km/h 0.0 mm Extreme 53
3 Sept 33.8 °C 9 % 37 km/h 0.0 mm Extreme 54
4 Sept 33.5 °C 9 % 38 km/h 0.0 mm Extreme 56
5 Sept 33.3 °C 12 % 38 km/h 0.0 mm Extreme 58
6 Sept 34.0 °C 12 % 36 km/h 0.0 mm Extreme 55
7 Sept 34.2 °C 13 % 32 km/h 0.0 mm Extreme 54
8 Sept 34.4 °C 13 % 45 km/h 0.0 mm Extreme 64
9 Sept 34.4 °C 11 % 41 km/h 0.0 mm Extreme 60
10 Sept 34.3 °C 10 % 33 km/h 0.0 mm Extreme 55
11 Sept 34.0 °C 12 % 23 km/h 0.0 mm Extreme 51
12 Sept 28.9 °C 16 % 44 km/h 0.0 mm Extreme 59
13 Sept after 32.7 °C 12 % 40 km/h 0.0 mm Extreme 54
14 Sept after 33.3 °C 17 % 43 km/h 0.0 mm Extreme 58
15 Sept after 34.4 °C 12 % 40 km/h 0.0 mm Extreme 57
16 Sept after 34.9 °C 9 % 37 km/h 0.0 mm Extreme 57
17 Sept after 35.0 °C 10 % 38 km/h 0.0 mm Extreme 59
18 Sept after 35.9 °C 10 % 35 km/h 0.0 mm Extreme 56
19 Sept after 33.9 °C 17 % 34 km/h 0.0 mm Extreme 55
20 Sept after 34.3 °C 18 % 33 km/h 0.0 mm Extreme 52
21 Sept after 35.0 °C 13 % 37 km/h 0.0 mm Very high 50
22 Sept after 34.3 °C 14 % 42 km/h 0.0 mm Extreme 61

Its twins: fires that started in the same weather

It started with an FWI of 52.5, a minimum humidity of 13% and more than two months without rain. Fires in the area that started in weather like this since 2016: 41.

FWI at the start 52.5
Minimum humidity 13 %
Days without rain 60+
this fire chosen twins rest of the area
Almost identicalSimilar

Outlines of the closest twins

Mavinga fire, September 2019
10,449 ha 7 days FWI 52.6 Min. humidity 13 % 56 km away, in 2019

First rain (1 mm or more) after it ended: none in the following ten days.

See its page Compare with this fire

What happened to them

11 days
median duration
6,666 ha
median area
32 %
went past 10,000 ha
1.6 mm
rain at the end (median; 8 of 41 had it)

It burned an area similar to its twins (7,792 ha against a median of 6,666 ha) and lasted 18 days, against 11 days.

In 33 of 41, 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 1.6 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
53km/h · max. gust

It was considered over on 12 Sept, and not even 1 mm fell in the following ten days: it went out without rain. Twins with rain when they ended: 8 of 41, with a median of 1.6 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.

How we calculate it

Before and after, from space

Drag the line to compare the same ground before the fire and after it.

Before · 19 Aug 2023
After · 19 Sept 2023

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 · Copernicus

On 25 August 2023 the air beside the fire reached 71 µg/m³ of PM2.5. That day averaged 43: 2.9 times the WHO daily guideline (15).

PM2.5 peak71 µg/m³
Days over the guideline12 days
PM10101 µg/m³
Optical depth1.30
24 Aug28 Aug1 Sept5 Sept
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 · 329Every 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 timeSatelliteFRP (MW)LatLon

Other fires nearby

All fires in Angola

Frequently asked questions

How long did the Nancova fire last?
According to the heat detections seen by satellite inside the perimeter, it burned from 26 August 2023 to 12 September 2023 (18 days). The perimeter dates it from 26 August 2023 to 5 September 2023.
How much area did it burn?
The perimeter GWIS (Copernicus) rebuilt from heat detections is 7,792 hectares (77.9 km²). It is an estimate: official national figures may differ.
Which municipalities burned?
The fire only entered Nancova (7,823 ha, 0.8 %).
What was the weather like?
During the fire the temperature reached 34.4 °C, humidity dropped to 9 % and gusts hit 53 km/h. The fire danger index (FWI) reached 64, 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.
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: 41. Their median duration was 11 days and their median area 6,666 ha; 32 % went past 10,000 ha. In 33 of 41, 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 1.6 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.
  1. Last day with fire: 5 September 2023 → 12 September 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
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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 26 August 2023 to 5 September 2023. 329 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.
  • Built-up area and population come from the JRC Global Human Settlement Layer (epoch 2025, 100 m cells), summed inside the perimeter: an estimate of what was there, not a damage count.

How we build fire pages: methodology

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.