Burned area
satellite only3,304ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 6 Sept 2023 – 11 Sept 2023
+− cross-check
No official record is matched to this page to compare it with.
ZM · Zambia · –
Kasempa fire, 6 September 2023 Mpongwe, Kasempa
Out · last detection 11 Sept 2023, 11:58 UTC
The fire started on 6 September 2023 in Kasempa, Zambia, and satellites saw it burning for 6 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 3,304 hectares from heat detections, spread across 2 municipalities.
It is the 107th largest in North-Western since 2016 (of 134 with a page). Number 139 in Zambia in 2023, of 165.
Use this data
Compare with…
Use this data
Fire page data · version 2026-11-15matches 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 only6days
6 Sept 2023 to 11 Sept 2023: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 11 Sept 2023, 11:58 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 only6 Sept 2023
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 6 Sept 2023
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only100
VIIRS detections at 375 m. Most intense hotspot: 48 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 6 Sept 2023 – 11 Sept 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 only1,020MW
Total radiative power on 9 September 2023; hotspots that day: 53.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 9 Sept 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
model39.2FWI · very high
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 60.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 6 Sept 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
model32.6°C · 20% RH
High of 32.6 °C and minimum humidity of 20% on 11 September 2023; gusts of 50 km/h on 8 September 2023.
- Source
- weather model at the fire’s grid cell
- Date
- 6 Sept 2023 – 11 Sept 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
-
logName: Mpongwe → Kasempa.
-
· reconstructed weatherWeather and FWI computed from the ERA5 reanalysis
-
logLast day with fire: 10 September 2023 → 11 September 2023.
-
logStart date: 8 September 2023 → 6 September 2023.
Area logged each night
Move the slider to see which area the page published each day.
Versioned permanent link
https://worldfires.org/en/fire/kasempa-2023-09-4?v=2026-11-15A 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 kasempa-2023-09-4.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023-09-06 | 2 | 6 | 31.8 | 17.1 | 24 | 13.4 | 27.7 | 0 | 39.2 | muy_alto | 1 |
| 2023-09-07 | 2 | 19 | 32.4 | 18.5 | 14 | 16.5 | 38.5 | 0 | 57.2 | extremo | 1 |
| 2023-09-08 | 26 | 237 | 32.2 | 16.5 | 16 | 21.2 | 50.4 | 0 | 72.9 | muy_extremo | 1 |
| 2023-09-09 | 53 | 1,020 | 30.7 | 16.2 | 19 | 15.1 | 39.2 | 0 | 60.8 | extremo | 1 |
| 2023-09-10 | 12 | 143 | 30.4 | 16.9 | 17 | 14.1 | 37.1 | 0 | 50.2 | extremo | 1 |
| 2023-09-11 | 5 | 24 | 32.6 | 17.7 | 20 | 13 | 27.7 | 0 | 49.1 | muy_alto | 1 |
| 2023-09-12 | 0 | 0 | 33.5 | 17.8 | 12 | 17.1 | 32.8 | 0 | 55 | extremo | 0 |
| 2023-09-13 | 0 | 0 | 29 | 19.5 | 27 | 27.3 | 61.6 | 0 | 65.4 | extremo | 0 |
| 2023-09-14 | 0 | 0 | 29.4 | 16.3 | 28 | 17.2 | 42.1 | 0 | 46.3 | muy_alto | 0 |
| 2023-09-15 | 0 | 0 | 30.4 | 16.2 | 24 | 15.3 | 32.8 | 0 | 43 | muy_alto | 0 |
| 2023-09-16 | 0 | 0 | 32.5 | 16.9 | 17 | 14 | 30.6 | 0 | 41.8 | muy_alto | 0 |
| 2023-09-17 | 0 | 0 | 33.2 | 18.2 | 14 | 15.6 | 32.4 | 0 | 49.9 | muy_alto | 0 |
| 2023-09-18 | 0 | 0 | 33.6 | 19.4 | 13 | 20.9 | 50.8 | 0 | 68.8 | extremo | 0 |
| 2023-09-19 | 0 | 0 | 32.3 | 20 | 17 | 17.1 | 42.5 | 0 | 58.4 | extremo | 0 |
| 2023-09-20 | 0 | 0 | 32.4 | 18.9 | 16 | 15.4 | 36 | 0 | 53.1 | extremo | 0 |
| 2023-09-21 | 0 | 0 | 33.4 | 19.2 | 14 | 18 | 45.4 | 0 | 71.5 | muy_extremo | 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
- 3,304ha
- GWIS perimeter (Copernicus)
- Duration
- 6days
- 6 Sept 2023 – 11 Sept 2023
- Municipalities hit
- 2
- districts
- Started on
- 6 Sept
- 2023
- Heat detections
- 100
- in a single hotspot: 48 MW
- Danger at start
- 39
- Very high · FWI index
- Average daily power
- 242MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
6 Sept11 Sept
11 Sept 2023
How it evolved, day by day
6 Sept
9 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
33°high
50km/h · peak gust
14%lowest humidity
It had gone more than two months without rain (1 mm or more) when it started.
This area had burned before
62% of the perimeter overlaps earlier fires recorded since 2016: 9 ha in 2020, 273 ha in 2021, 1,793 ha in 2022.
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
-
2,348 ha0.3 %
-
Kasempa where it started977 ha0.0 %
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)
Started with 60 days without rain: 91 % of the area in Zambia
| Day | High | Min. humidity | Peak gust | Rain | Danger (FWI) |
|---|---|---|---|---|---|
| 6 Sept | 31.8 °C | 24 % | 28 km/h | 0.0 mm | Very high 39 |
| 7 Sept | 32.4 °C | 14 % | 38 km/h | 0.0 mm | Extreme 57 |
| 8 Sept | 32.2 °C | 16 % | 50 km/h | 0.0 mm | Very extreme 73 |
| 9 Sept | 30.7 °C | 19 % | 39 km/h | 0.0 mm | Extreme 61 |
| 10 Sept | 30.4 °C | 17 % | 37 km/h | 0.0 mm | Extreme 50 |
| 11 Sept | 32.6 °C | 20 % | 28 km/h | 0.0 mm | Very high 49 |
| 12 Sept after | 33.5 °C | 12 % | 33 km/h | 0.0 mm | Extreme 55 |
| 13 Sept after | 29.0 °C | 27 % | 62 km/h | 0.0 mm | Extreme 65 |
| 14 Sept after | 29.4 °C | 28 % | 42 km/h | 0.0 mm | Very high 46 |
| 15 Sept after | 30.4 °C | 24 % | 33 km/h | 0.0 mm | Very high 43 |
| 16 Sept after | 32.5 °C | 17 % | 31 km/h | 0.0 mm | Very high 42 |
| 17 Sept after | 33.2 °C | 14 % | 32 km/h | 0.0 mm | Very high 50 |
| 18 Sept after | 33.6 °C | 13 % | 51 km/h | 0.0 mm | Extreme 69 |
| 19 Sept after | 32.3 °C | 17 % | 42 km/h | 0.0 mm | Extreme 58 |
| 20 Sept after | 32.4 °C | 16 % | 36 km/h | 0.0 mm | Extreme 53 |
| 21 Sept after | 33.4 °C | 14 % | 45 km/h | 0.0 mm | Very extreme 72 |
Its twins: fires that started in the same weather
It started with an FWI of 39.2, a minimum humidity of 24% and more than two months without rain. Fires in the area that started in weather like this since 2016: 36.
FWI at the start
39.2
Minimum humidity
24 %
Days without rain
60+
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Kasempa fire, 6 September 2023
3,304 ha
6 days
FWI 39.2
Min. humidity 24 %
Mushindano fire, August 2023
3,597 ha
13 days
FWI 39.0
Min. humidity 24 %
101 km away, in 2023
First rain (1 mm or more) after it ended: none in the following ten days.
Mumbwa fire, August 2020
7,471 ha
9 days
FWI 38.9
Min. humidity 24 %
126 km away, in 2020
First rain (1 mm or more) after it ended: none in the following ten days.
Kasempa fire, September 2021
3,256 ha
15 days
FWI 40.1
Min. humidity 24 %
107 km away, in 2021
First rain (1 mm or more) after it ended: 1.3 mm on 2 Oct.
Kasempa fire, August 2020
3,225 ha
9 days
FWI 39.6
Min. humidity 23 %
95 km away, in 2020
First rain (1 mm or more) after it ended: none in the following ten days.
Mushindano fire, August 2018
3,371 ha
17 days
FWI 39.1
Min. humidity 23 %
152 km away, in 2018
First rain (1 mm or more) after it ended: none in the following ten days.
What happened to them
- 10 days
- median duration
- 4,122 ha
- median area
- 11 %
- went past 10,000 ha
- 1.3 mm
- rain at the end (median; 1 of 36 had it)
It burned an area similar to its twins (3,304 ha against a median of 4,122 ha) and lasted 6 days, against 10 days.
In 35 of 36, 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
50km/h · max. gust
It was considered over on 11 Sept, and not even 1 mm fell in the following ten days: it went out without rain. Twins with rain when they ended: 1 of 36, 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 · 30 Aug 2023
After · 18 Sept 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 12 September 2023 the air beside the fire reached 56 µg/m³ of PM2.5. That day averaged 36: 2.4 times the WHO daily guideline (15).
PM2.5 peak56 µg/m³
Days over the guideline8 days
PM1080 µg/m³
Optical depth1.07
WHO 15
6 Sept8 Sept10 Sept12 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 · 100Every 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
- 5,460 haMpongweSeptember 2020 · 6 days · 6 km away
- 6,489 haKasempa21 August 2026 · 13 days · 10 km away
- 16,801 haKasempa21 August 2023 · 8 days · 12 km away
- 7,301 haMpongwe22 July 2026 · 13 days · 24 km away
- 7,137 haMpongweSeptember 2026 · 7 days · 26 km away
- 5,454 haKasempa19 August 2026 · 17 days · 30 km away
Frequently asked questions
- How long did the Kasempa fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 6 September 2023 to 11 September 2023 (6 days). The perimeter dates it from 8 September 2023 to 10 September 2023.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 3,304 hectares (33.0 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 2 municipalities: Mpongwe (2,348 ha, 0.3 %); Kasempa (977 ha, 0.0 %).
- What was the weather like?
- During the fire the temperature reached 32.6 °C, humidity dropped to 14 % and gusts hit 50 km/h. The fire danger index (FWI) reached 73, class Very extreme.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Zambia (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: 36. Their median duration was 10 days and their median area 4,122 ha; 11 % went past 10,000 ha. In 35 of 36, 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 · 3 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
- Name: Mpongwe → Kasempa.
- Last day with fire: 10 September 2023 → 11 September 2023.
- Start date: 8 September 2023 → 6 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
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 8 September 2023 to 10 September 2023. 100 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 (Creative Commons Attribution 4.0 (CC BY 4.0)). 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.