Burned area
satellite only18,387ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 6 Aug 2021 – 13 Aug 2021
+− cross-check
No official record is matched to this page to compare it with.
BR · Brazil · –
Altamira fire, 6 August 2021 Altamira, São Félix do Xingu
Out · last detection 13 Aug 2021, 04:58 UTC
The fire started on 6 August 2021 in Altamira, Brazil, and satellites saw it burning for 8 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 18,387 hectares from heat detections, spread across 2 municipalities.
It is the 94th largest in Pará since 2016 (of 957 with a page). Number 64 in Brazil in 2021, of 814.
Use this data
Compare with…
Use this data
Fire page data · version 2026-10-24matches 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 only8days
6 Aug 2021 to 13 Aug 2021: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 13 Aug 2021, 04:58 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 Aug 2021
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 6 Aug 2021
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only1,663
VIIRS detections at 375 m. Most intense hotspot: 772 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 6 Aug 2021 – 13 Aug 2021
+− 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 only25,349MW
Total radiative power on 6 August 2021; hotspots that day: 254.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 6 Aug 2021
+− 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
model41.5FWI · very high
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 42.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 6 Aug 2021, 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
model36.6°C · 23% RH
High of 36.6 °C and minimum humidity of 23% on 11 August 2021; gusts of 40 km/h on 8 August 2021.
- Source
- weather model at the fire’s grid cell
- Date
- 6 Aug 2021 – 13 Aug 2021
- 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 GHSLPopulation and built-up area computed
-
· reconstructed weatherWeather and FWI computed from the ERA5 reanalysis
What was saved on 24 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
- 18,387 ha
- Dates
- 6 Aug 2021 – 13 Aug 2021
- Name
- Altamira
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/altamira-2021-08-4?v=2026-10-24A 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 altamira-2021-08-4.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021-08-06 | 254 | 25,349 | 35.9 | 19.9 | 21 | 13.1 | 36 | 0 | 41.5 | muy_alto | 1 |
| 2021-08-07 | 412 | 14,275 | 35.6 | 20.8 | 23 | 13.5 | 37.4 | 0 | 42.1 | muy_alto | 1 |
| 2021-08-08 | 407 | 3,172 | 34.1 | 21.4 | 30 | 14.6 | 40 | 0 | 41.4 | muy_alto | 1 |
| 2021-08-09 | 291 | 9,964 | 35.2 | 20.9 | 27 | 13.5 | 38.9 | 0 | 40.6 | muy_alto | 1 |
| 2021-08-10 | 172 | 1,774 | 35.7 | 20.9 | 27 | 10 | 31.7 | 0 | 37.5 | alto | 1 |
| 2021-08-11 | 92 | 551 | 36.6 | 20.6 | 23 | 9.8 | 28.4 | 0 | 37.6 | alto | 1 |
| 2021-08-12 | 24 | 107 | 35.7 | 20.8 | 28 | 8.5 | 25.9 | 0 | 36.6 | alto | 1 |
| 2021-08-13 | 11 | 12 | 34.7 | 23.7 | 39 | 10.6 | 27 | 0 | 33.3 | alto | 1 |
| 2021-08-14 | 0 | 0 | 32.9 | 22.9 | 44 | 10 | 33.1 | 0 | 29.2 | alto | 0 |
| 2021-08-15 | 0 | 0 | 35.3 | 22.3 | 28 | 9 | 25.9 | 0 | 32.6 | alto | 0 |
| 2021-08-16 | 0 | 0 | 35.3 | 20.8 | 28 | 10.2 | 24.1 | 0 | 34 | alto | 0 |
| 2021-08-17 | 0 | 0 | 35.7 | 21.4 | 26 | 12.3 | 35.6 | 0 | 37.3 | alto | 0 |
| 2021-08-18 | 0 | 0 | 36.9 | 20.2 | 21 | 13.4 | 36.7 | 0 | 42.6 | muy_alto | 0 |
| 2021-08-19 | 0 | 0 | 36.8 | 19.7 | 20 | 12 | 34.6 | 0 | 42.2 | muy_alto | 0 |
| 2021-08-20 | 0 | 0 | 36.9 | 21.1 | 19 | 11.9 | 35.3 | 0 | 42.9 | muy_alto | 0 |
| 2021-08-21 | 0 | 0 | 36.6 | 21.9 | 23 | 9.8 | 30.6 | 0 | 41.1 | muy_alto | 0 |
| 2021-08-22 | 0 | 0 | 35.7 | 23.5 | 30 | 9.7 | 28.1 | 0 | 38.4 | muy_alto | 0 |
| 2021-08-23 | 0 | 0 | 36.3 | 23.3 | 27 | 9.8 | 28.4 | 0 | 38.6 | muy_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
- 18,387ha
- GWIS perimeter (Copernicus)
- Duration
- 8days
- 6 Aug 2021 – 13 Aug 2021
- Municipalities hit
- 2
- municipalities
- Started on
- 6 Aug
- 2021
- Heat detections
- 1,663
- in a single hotspot: 772 MW
- Danger at start
- 42
- Very high · FWI index
- Average daily power
- 6.9GW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
6 Aug13 Aug
13 Aug 2021
How it evolved, day by day
6 Aug
8 Aug
10 Aug
12 Aug
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
37°high
40km/h · peak gust
21%lowest humidity
It had gone 42 days without rain (1 mm or more) when it started.
This area had burned before
70% of the perimeter overlaps earlier fires recorded since 2016: 867 ha in 2016, 3,869 ha in 2017, 373 ha in 2018, 11,128 ha in 2019, 10,808 ha in 2020. Part of it burned more than once, so the yearly figures add up to more than the 12,898 ha that had burned before.
- 10,086 ha São Félix do Xingu fire, July 2020 38,130 ha in total; the hectares shown are those it shares with this fire
- 5,791 ha Altamira fire, July 2019 5,855 ha in total; the hectares shown are those it shares with this fire
- 2,718 ha Altamira fire, August 2019 3,239 ha in total; the hectares shown are those it shares with this fire
- 1,514 ha Altamira fire, July 2019 7,363 ha in total; the hectares shown are those it shares with this fire
- 1,311 ha Altamira fire, July 2017 3,021 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
-
18,201 ha reached on 6 Aug0.1 %
-
São Félix do Xingu 65,418 inhabitants310 ha reached on 7 Aug0.0 %
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.
People and buildings inside the perimeter
GHSL 2020Built-up area< 0.1 ha
Residents< 20
Inside the perimeter there was no noticeable built-up land and almost nobody lived there (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) |
|---|---|---|---|---|---|
| 6 Aug | 35.9 °C | 21 % | 36 km/h | 0.0 mm | Very high 42 |
| 7 Aug | 35.6 °C | 23 % | 37 km/h | 0.0 mm | Very high 42 |
| 8 Aug | 34.1 °C | 30 % | 40 km/h | 0.0 mm | Very high 41 |
| 9 Aug | 35.2 °C | 27 % | 39 km/h | 0.0 mm | Very high 41 |
| 10 Aug | 35.7 °C | 27 % | 32 km/h | 0.0 mm | High 38 |
| 11 Aug | 36.6 °C | 23 % | 28 km/h | 0.0 mm | High 38 |
| 12 Aug | 35.7 °C | 28 % | 26 km/h | 0.0 mm | High 37 |
| 13 Aug | 34.7 °C | 39 % | 27 km/h | 0.0 mm | High 33 |
| 14 Aug after | 32.9 °C | 44 % | 33 km/h | 0.0 mm | High 29 |
| 15 Aug after | 35.3 °C | 28 % | 26 km/h | 0.0 mm | High 33 |
| 16 Aug after | 35.3 °C | 28 % | 24 km/h | 0.0 mm | High 34 |
| 17 Aug after | 35.7 °C | 26 % | 36 km/h | 0.0 mm | High 37 |
| 18 Aug after | 36.9 °C | 21 % | 37 km/h | 0.0 mm | Very high 43 |
| 19 Aug after | 36.8 °C | 20 % | 35 km/h | 0.0 mm | Very high 42 |
| 20 Aug after | 36.9 °C | 19 % | 35 km/h | 0.0 mm | Very high 43 |
| 21 Aug after | 36.6 °C | 23 % | 31 km/h | 0.0 mm | Very high 41 |
| 22 Aug after | 35.7 °C | 30 % | 28 km/h | 0.0 mm | Very high 38 |
| 23 Aug after | 36.3 °C | 27 % | 28 km/h | 0.0 mm | Very high 39 |
Its twins: fires that started in the same weather
It started with an FWI of 41.5, a minimum humidity of 21% and 42 days without rain. Fires in the area that started in weather like this since 2016: 48.
FWI at the start
41.5
Minimum humidity
21 %
Days without rain
42
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Altamira fire, 6 August 2021
18,387 ha
8 days
FWI 41.5
Min. humidity 21 %
Altamira fire, August 2023
6,984 ha
17 days
FWI 41.8
Min. humidity 21 %
88 km away, in 2023
First rain (1 mm or more) after it ended: none in the following ten days.
São Félix do Xingu fire, August 2023
5,305 ha
11 days
FWI 40.5
Min. humidity 20 %
17 km away, in 2023
First rain (1 mm or more) after it ended: 1.9 mm on 31 Aug.
Altamira fire, August 2019
3,588 ha
12 days
FWI 40.7
Min. humidity 22 %
206 km away, in 2019
First rain (1 mm or more) after it ended: 2.0 mm on 23 Aug.
São Félix do Xingu fire, August 2023
4,589 ha
13 days
FWI 38.2
Min. humidity 22 %
25 km away, in 2023
First rain (1 mm or more) after it ended: 1.7 mm on 30 Aug.
Altamira fire, August 2024
3,445 ha
6 days
FWI 37.4
Min. humidity 23 %
46 km away, in 2024
First rain (1 mm or more) after it ended: 2.7 mm on 14 Aug.
What happened to them
- 17 days
- median duration
- 4,620 ha
- median area
- 19 %
- went past 10,000 ha
- 1.9 mm
- rain at the end (median; 33 of 48 had it)
It was 4.0 times larger than the median of its twins and lasted 8 days, against 17 days.
Only 2 of its 48 twins burned more. The weather on the first day does not explain everything: the wind in the following days, the fuel and the firefighting also count. In 15 of 48, 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 1.9 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
40km/h · max. gust
It was considered over on 13 Aug, and not even 1 mm fell in the following ten days: it went out without rain. Twins with rain when they ended: 33 of 48, with a median of 1.9 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 Jul 2021
After · 20 Aug 2021
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.
Detections table · 1,663Every 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
- 15,787 haAltamira29 August 2024 · 27 days · 15 km away
- 38,130 haSão Félix do Xingu23 July 2020 · 36 days · 20 km away
- 17,088 haSão Félix do Xingu4 August 2021 · 17 days · 20 km away
- 20,821 haSão Félix do Xingu6 August 2024 · 40 days · 21 km away
- 28,670 haSão Félix do Xingu5 August 2023 · 31 days · 22 km away
- 11,387 haAltamira21 July 2020 · 34 days · 29 km away
Frequently asked questions
- How long did the Altamira fire last?
- GWIS (Copernicus) dates it between 6 August 2021 and 13 August 2021: 8 days 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 18,387 hectares (183.9 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 2 municipalities: Altamira (18,201 ha, 0.1 %); São Félix do Xingu (310 ha, 0.0 %).
- What was the weather like?
- During the fire the temperature reached 36.6 °C, humidity dropped to 21 % and gusts hit 40 km/h. The fire danger index (FWI) reached 42, class Very high.
- 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.
- 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: 48. Their median duration was 17 days and their median area 4,620 ha; 19 % went past 10,000 ha. Only 2 of its 48 twins burned more. The weather on the first day does not explain everything: the wind in the following days, the fuel and the firefighting also count. In 15 of 48, 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 1.9 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.
Emergency number: 193 · Emergency number and official warnings
Satellite cross-check
History of this page Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
No changes since 24 October 2026.
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 from the perimeter: the VIIRS detections inside it did not change them. 1,663 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.