Burned area
satellite only2,264ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 16 Jun 2023 – 19 Jun 2023
+− cross-check
No official record is matched to this page to compare it with.
ZA · South Africa · –
Joe Morolong fire, June 2023 Joe Morolong
Out · last detection 19 Jun 2023, 13:10 UTC
The fire started on 16 June 2023 in Joe Morolong, South Africa, and satellites saw it burning for 4 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 2,264 hectares from heat detections, spread across a single municipality.
It is the 78th largest in Nothern Cape since 2016 (of 101 with a page). Number 123 in South Africa in 2023, of 150.
Use this data
Compare with…
Use this data
Fire page data · version 2026-10-27matches 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 only4days
16 Jun 2023 to 19 Jun 2023: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 19 Jun 2023, 13:10 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 only16 Jun 2023
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 16 Jun 2023
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only82
VIIRS detections at 375 m. Most intense hotspot: 178 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 16 Jun 2023 – 19 Jun 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 only1,728MW
Total radiative power on 17 June 2023; hotspots that day: 63.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 17 Jun 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
model25.9FWI · high
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 16.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 16 Jun 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
model26.7°C · 7% RH
High of 26.7 °C and minimum humidity of 7% on 17 June 2023; gusts of 46 km/h on 17 June 2023.
- Source
- weather model at the fire’s grid cell
- Date
- 16 Jun 2023 – 19 Jun 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
-
· reconstructed weatherWeather and FWI computed from the ERA5 reanalysis
-
logStart date: 17 June 2023 → 16 June 2023.
-
· reconstructed GHSLPopulation and built-up area computed
What was saved on 27 October 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
- 2,264 ha
- Dates
- 16 Jun 2023 – 19 Jun 2023
- Name
- Joe Morolong
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/joe-morolong-2023-06?v=2026-10-27A 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 joe-morolong-2023-06.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023-06-16 | 4 | 35 | 23.6 | 0.9 | 20 | 12.1 | 20.9 | 0 | 25.9 | alto | 1 |
| 2023-06-17 | 63 | 1,728 | 26.7 | 4.3 | 7 | 26.2 | 45.7 | 0 | 48.1 | muy_alto | 1 |
| 2023-06-18 | 6 | 40 | 24.6 | 2.8 | 9 | 17.9 | 32.4 | 0 | 40.3 | muy_alto | 1 |
| 2023-06-19 | 9 | 269 | 22.4 | 3.6 | 15 | 22.7 | 39.2 | 0 | 43.1 | muy_alto | 1 |
| 2023-06-20 | 0 | 0 | 18.7 | 2.2 | 16 | 12.1 | 21.6 | 0 | 31.7 | alto | 0 |
| 2023-06-21 | 0 | 0 | 22.1 | -1.9 | 11 | 11.8 | 23.8 | 0 | 32 | alto | 0 |
| 2023-06-22 | 0 | 0 | 25 | 3.6 | 10 | 14.4 | 24.8 | 0 | 35.8 | alto | 0 |
| 2023-06-23 | 0 | 0 | 25.7 | 3 | 17 | 21.8 | 38.2 | 0 | 43.1 | muy_alto | 0 |
| 2023-06-24 | 0 | 0 | 25.2 | 6.1 | 22 | 20.4 | 37.1 | 0 | 39.1 | muy_alto | 0 |
| 2023-06-25 | 0 | 0 | 25.6 | 5.4 | 18 | 24 | 41 | 0 | 43.2 | muy_alto | 0 |
| 2023-06-26 | 0 | 0 | 25.6 | 7.1 | 18 | 23.2 | 42.5 | 0 | 42.9 | muy_alto | 0 |
| 2023-06-27 | 0 | 0 | 22.1 | 8.3 | 25 | 28.5 | 54.4 | 1.9 | 21.5 | alto | 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), GHSL (JRC). Open-Meteo.com · How we build fire pages: methodology
- Burnt area
- 2,264ha
- GWIS perimeter (Copernicus)
- Duration
- 4days
- 16 Jun 2023 – 19 Jun 2023
- Municipalities hit
- 1
- municipalities
- Started on
- 16 Jun
- 2023
- Heat detections
- 82
- in a single hotspot: 178 MW
- Danger at start
- 26
- High · FWI index
- Average daily power
- 518MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
16 Jun19 Jun
19 Jun 2023
How it evolved, day by day
16 Jun
17 Jun
18 Jun
19 Jun
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
27°high
46km/h · peak gust
7%lowest humidity
It had gone 16 days without rain (1 mm or more) when it started. Rain came after the fire: 1.9 mm on 27 Jun.
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
-
Joe Morolong where it started2,272 ha reached on 16 Jun0.1 %
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.
People and buildings inside the perimeter
GHSL 2025Built-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)
| Day | High | Min. humidity | Peak gust | Rain | Danger (FWI) |
|---|---|---|---|---|---|
| 16 Jun | 23.6 °C | 20 % | 21 km/h | 0.0 mm | High 26 |
| 17 Jun | 26.7 °C | 7 % | 46 km/h | 0.0 mm | Very high 48 |
| 18 Jun | 24.6 °C | 9 % | 32 km/h | 0.0 mm | Very high 40 |
| 19 Jun | 22.4 °C | 15 % | 39 km/h | 0.0 mm | Very high 43 |
| 20 Jun after | 18.7 °C | 16 % | 22 km/h | 0.0 mm | High 32 |
| 21 Jun after | 22.1 °C | 11 % | 24 km/h | 0.0 mm | High 32 |
| 22 Jun after | 25.0 °C | 10 % | 25 km/h | 0.0 mm | High 36 |
| 23 Jun after | 25.7 °C | 17 % | 38 km/h | 0.0 mm | Very high 43 |
| 24 Jun after | 25.2 °C | 22 % | 37 km/h | 0.0 mm | Very high 39 |
| 25 Jun after | 25.6 °C | 18 % | 41 km/h | 0.0 mm | Very high 43 |
| 26 Jun after | 25.6 °C | 18 % | 42 km/h | 0.0 mm | Very high 43 |
| 27 Jun after | 22.1 °C | 25 % | 54 km/h | 1.9 mm | High 22 |
Its twins: fires that started in the same weather
It started with an FWI of 25.9, a minimum humidity of 20% and 16 days without rain. Fires in the area that started in weather like this since 2017: 11.
FWI at the start
25.9
Minimum humidity
20 %
Days without rain
16
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Joe Morolong fire, June 2023
2,264 ha
4 days
FWI 25.9
Min. humidity 20 %
Tshabong fire, November 2022
2,264 ha
3 days
FWI 24.6
Min. humidity 18 %
205 km away, in 2022
First rain (1 mm or more) after it ended: 5.6 mm on 22 Nov.
Ngwaketse South fire, June 2023
2,387 ha
4 days
FWI 31.3
Min. humidity 16 %
179 km away, in 2023
First rain (1 mm or more) after it ended: none in the following ten days.
Ngwaketse Central fire, September 2023
5,396 ha
4 days
FWI 34.7
Min. humidity 20 %
226 km away, in 2023
First rain (1 mm or more) after it ended: 1.6 mm on 10 Oct.
Ngwaketse North fire, July 2022
2,830 ha
3 days
FWI 35.5
Min. humidity 23 %
233 km away, in 2022
First rain (1 mm or more) after it ended: none in the following ten days.
Ngwaketse South fire, August 2022
3,246 ha
2 days
FWI 29.6
Min. humidity 13 %
187 km away, in 2022
First rain (1 mm or more) after it ended: none in the following ten days.
What happened to them
Fires in the area that started in similar weather: 11. With fewer than 15 we give no figures: they would be more noise than signal.
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
1.9 mmfirst rain
27 Jun8 days after it ended
46km/h · max. gust
It was considered over on 19 Jun, and on 27 Jun 1.9 mm fell. We do not know whether the rain or the firefighters put it out.
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 2017.
- 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 · 9 Jun 2023
After · 26 Jun 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 19 June 2023 the air beside the fire reached 82 µg/m³ of PM2.5. That day averaged 39: 2.6 times the WHO daily guideline (15).
PM2.5 peak82 µg/m³
Days over the guideline2 days
PM10118 µg/m³
Optical depth0.20
WHO 15
15 Jun17 Jun19 Jun21 Jun
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 · 82Every 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 Joe Morolong fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 16 June 2023 to 19 June 2023 (4 days). The perimeter dates it from 17 June 2023 to 19 June 2023.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 2,264 hectares (22.6 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Joe Morolong (2,272 ha, 0.1 %).
- What was the weather like?
- During the fire the temperature reached 26.7 °C, humidity dropped to 7 % and gusts hit 46 km/h. The fire danger index (FWI) reached 48, class Very high.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of South Africa (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.
Emergency number: 10177 · 112 · Emergency number and official warnings
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.
- Start date: 17 June 2023 → 16 June 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 17 June 2023 to 19 June 2023. 82 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.
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 ADM3 (Creative Commons Attribution 3.0 Intergovernmental Organisations (CC BY 3.0 IGO)). 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.