Letsemeng fire, July 2021 Letsemeng
The fire started on 12 July 2021 in Letsemeng, South Africa, and satellites saw it burning for 1 day. Copernicus’s global GWIS system rebuilt a burnt perimeter of 3,560 hectares from heat detections, spread across a single municipality.
It is the 23th largest in Free State since 2016 (of 91 with a page). Number 45 in South Africa in 2021, of 156.
- Burnt area
- 3,560ha
- GWIS perimeter (Copernicus)
- Duration
- 1day
- 12 Jul 2021 – 12 Jul 2021
- Municipalities hit
- 1
- municipalities
- Started on
- 12 Jul
- 2021
- Heat detections
- 83
- in a single hotspot: 274 MW
- Danger at start
- 68
- Extreme · FWI index
- Energy released
- 3.0GW
- 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
No earlier perimeters overlap this fire since 2016, when the satellite record begins.
What happened to each town
-
Letsemeng where it started3,572 ha reached on 12 Jul0.4 %
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) |
|---|---|---|---|---|---|
| 12 Jul | 22.8 °C | 19 % | 73 km/h | 0.0 mm | Extreme 68 |
| 13 Jul after | 8.6 °C | 28 % | 53 km/h | 0.0 mm | Very high 45 |
| 14 Jul after | 12.0 °C | 17 % | 27 km/h | 0.0 mm | High 30 |
| 15 Jul after | 14.2 °C | 13 % | 24 km/h | 0.0 mm | High 31 |
| 16 Jul after | 16.5 °C | 22 % | 28 km/h | 0.0 mm | High 32 |
| 17 Jul after | 18.2 °C | 23 % | 20 km/h | 0.0 mm | High 32 |
| 18 Jul after | 19.2 °C | 19 % | 24 km/h | 0.0 mm | High 32 |
| 19 Jul after | 19.2 °C | 9 % | 32 km/h | 0.0 mm | Very high 41 |
| 20 Jul after | 18.9 °C | 18 % | 46 km/h | 0.0 mm | Very high 49 |
| 21 Jul after | 12.2 °C | 17 % | 40 km/h | 0.0 mm | Very high 43 |
| 22 Jul after | 8.3 °C | 29 % | 38 km/h | 0.0 mm | High 35 |
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 · 83Every 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 Letsemeng fire last?
- GWIS (Copernicus) dates it between 12 July 2021 and 12 July 2021: 1 day 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 3,560 hectares (35.6 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Letsemeng (3,572 ha, 0.4 %).
- What was the weather like?
- During the fire the temperature reached 22.8 °C, humidity dropped to 19 % and gusts hit 73 km/h. The fire danger index (FWI) reached 68, class Extreme.
- 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
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 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.