Pimenteiras fire, August 2021 Pimenteiras, Lagoa do Sítio
The fire started on 26 August 2021 in Pimenteiras, Brazil, and satellites saw it burning for 19 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 22,023 hectares from heat detections, spread across 2 municipalities.
It is the 22th largest in Piaui since 2016 (of 804 with a page). Number 48 in Brazil in 2021, of 814.
Compare with…
- Burnt area
- 22,023ha
- GWIS perimeter (Copernicus)
- Duration
- 19days
- 26 Aug 2021 – 13 Sept 2021
- Municipalities hit
- 2
- municipalities
- Started on
- 26 Aug
- 2021
- Heat detections
- 804
- in a single hotspot: 298 MW
- Danger at start
- 45
- Very high · FWI index
- Average daily power
- 875MW
- detected power per day, on average
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
53% of the perimeter overlaps earlier fires recorded since 2016: 400 ha in 2016, 11,543 ha in 2019, 531 ha in 2020. Part of it burned more than once, so the yearly figures add up to more than the 11,595 ha that had burned before.
- 6,631 ha Pimenteiras fire, August 2019 36,687 ha in total; the hectares shown are those it shares with this fire
- 3,009 ha Pimenteiras fire, August 2019 4,402 ha in total; the hectares shown are those it shares with this fire
- 531 ha Pimenteiras fire, September 2020 6,765 ha in total; the hectares shown are those it shares with this fire
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
-
21,988 ha reached on 26 Aug4.8 %
-
Lagoa do Sítio 4,520 inhabitants181 ha reached on 30 Aug0.2 %
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 2020Inside the perimeter there were about 1.4 hectares of built-up land and about 80 residents (GHSL 2020, 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.
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) |
|---|---|---|---|---|---|
| 26 Aug | 35.9 °C | 26 % | 42 km/h | 0.0 mm | Very high 45 |
| 27 Aug | 36.0 °C | 26 % | 42 km/h | 0.0 mm | Very high 46 |
| 28 Aug | 35.4 °C | 26 % | 50 km/h | 0.0 mm | Extreme 52 |
| 29 Aug | 36.0 °C | 20 % | 48 km/h | 0.0 mm | Extreme 52 |
| 30 Aug | 35.5 °C | 27 % | 43 km/h | 0.0 mm | Very high 48 |
| 31 Aug | 35.1 °C | 27 % | 41 km/h | 0.0 mm | Very high 48 |
| 1 Sept | 34.9 °C | 24 % | 40 km/h | 0.0 mm | Very high 47 |
| 2 Sept | 35.8 °C | 24 % | 39 km/h | 0.0 mm | Very high 48 |
| 3 Sept | 35.8 °C | 24 % | 35 km/h | 0.0 mm | Very high 48 |
| 4 Sept | 35.6 °C | 24 % | 45 km/h | 0.0 mm | Extreme 50 |
| 5 Sept | 37.2 °C | 19 % | 44 km/h | 0.0 mm | Extreme 52 |
| 6 Sept | 36.8 °C | 26 % | 40 km/h | 0.0 mm | Very high 48 |
| 7 Sept | 37.4 °C | 19 % | 37 km/h | 0.0 mm | Very high 47 |
| 8 Sept | 36.0 °C | 23 % | 34 km/h | 0.0 mm | Very high 46 |
| 9 Sept | 36.7 °C | 24 % | 32 km/h | 0.0 mm | Very high 46 |
| 10 Sept | 37.3 °C | 23 % | 32 km/h | 0.0 mm | Very high 45 |
| 11 Sept | 37.6 °C | 22 % | 35 km/h | 0.0 mm | Very high 48 |
| 12 Sept | 36.7 °C | 16 % | 38 km/h | 0.0 mm | Extreme 50 |
| 13 Sept | 35.9 °C | 25 % | 41 km/h | 0.0 mm | Extreme 50 |
| 14 Sept after | 35.5 °C | 27 % | 39 km/h | 0.0 mm | Very high 48 |
| 15 Sept after | 35.6 °C | 28 % | 38 km/h | 0.0 mm | Very high 46 |
| 16 Sept after | 35.8 °C | 25 % | 35 km/h | 0.0 mm | Very high 44 |
| 17 Sept after | 35.7 °C | 21 % | 43 km/h | 0.0 mm | Very high 49 |
| 18 Sept after | 35.0 °C | 28 % | 42 km/h | 0.0 mm | Very high 49 |
| 19 Sept after | 36.8 °C | 25 % | 38 km/h | 0.0 mm | Very high 46 |
| 20 Sept after | 36.6 °C | 25 % | 34 km/h | 0.0 mm | Very high 44 |
| 21 Sept after | 36.5 °C | 26 % | 34 km/h | 0.0 mm | Very high 43 |
| 22 Sept after | 37.2 °C | 25 % | 35 km/h | 0.0 mm | Very high 44 |
| 23 Sept after | 36.6 °C | 27 % | 39 km/h | 0.0 mm | Very high 45 |
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 · 804Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
- 36,687 haPimenteiras17 August 2019 · 23 days · 16 km away
- 11,446 haPimenteirasDecember 2019 · 14 days · 30 km away
- 16,505 haPimenteirasOctober 2020 · 13 days · 31 km away
- 13,296 haPimenteirasSeptember 2025 · 15 days · 34 km away
- 11,422 haPio IXSeptember 2019 · 28 days · 36 km away
- 12,070 haLagoa do Sítio18 August 2021 · 26 days · 38 km away
Frequently asked questions
- How long did the Pimenteiras fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 26 August 2021 to 13 September 2021 (19 days). The perimeter dates it from 27 August 2021 to 13 September 2021.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 22,023 hectares (220.2 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 2 municipalities: Pimenteiras (21,988 ha, 4.8 %); Lagoa do Sítio (181 ha, 0.2 %).
- What was the weather like?
- During the fire the temperature reached 37.6 °C, humidity dropped to 16 % and gusts hit 50 km/h. The fire danger index (FWI) reached 52, class Extreme.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Brazil (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: 193 · 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: 27 August 2021 → 26 August 2021.
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 27 August 2021 to 13 September 2021. 804 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 2020, 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 ADM2 (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.