Burned area
satellite only5,450ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 18 Oct 2026 – 5 Nov 2026
+− cross-check
No official record is matched to this page to compare it with.
BR · Brazil · –
Almeirim fire, 18 October 2026 Almeirim
Burning · last detection 5 Nov 2026, 17:00 UTC
The fire started on 18 October 2026 in Almeirim, Brazil, and satellites saw it burning for 19 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 5,450 hectares from heat detections, spread across a single municipality.
Number 300 in Brazil in 2026, of 775.
GWIS near-real-time perimeter, from the layer that changed in October 2025: this fire is not compared with fires from earlier years, because since then the GWIS layer gives more and larger perimeters.
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Fire page data · version 2026-11-05matches 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 only19days
From 18 Oct 2026 to today: still being detected.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 5 Nov 2026, 17:00 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 only18 Oct 2026
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 18 Oct 2026
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only842
VIIRS detections at 375 m. Most intense hotspot: 200 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP + NOAA-20)
- Date
- 18 Oct 2026 – 5 Nov 2026
+− 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 only1,205MW
Total radiative power on 27 October 2026; hotspots that day: 77.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 27 Oct 2026
+− 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
model20.8FWI · moderate
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 12.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 18 Oct 2026, local noon
- Model
- ECMWF IFS 0,25° · Open-Meteo.com · provisional
+− 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
model36.2°C · 28% RH
High of 36.2 °C and minimum humidity of 28% on 27 October 2026; gusts of 44 km/h on 22 October 2026.
- Source
- weather model at the fire’s grid cell
- Date
- 18 Oct 2026 – 5 Nov 2026
- Model
- ECMWF IFS 0,25° · Open-Meteo.com · provisional
+− 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 25 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
-
logArea: 5,326 → 5,450 ha.
-
· reconstructed weatherWeather and FWI computed from the forecast (provisional until ERA5 arrives)
-
logArea: 4,871 → 5,326 ha.
-
logArea: 4,623 → 4,871 ha.
-
logArea: 4,422 → 4,623 ha.
-
logArea: 4,203 → 4,422 ha.
-
logArea: 3,906 → 4,203 ha.
-
logArea: 3,803 → 3,906 ha.
-
· reconstructed GHSLPopulation and built-up area computed
-
logArea: 3,664 → 3,803 ha.
-
logArea: 3,491 → 3,664 ha.
-
logPage published (3,491 ha).
Area logged each night
Move the slider to see which area the page published each day.
Versioned permanent link
https://worldfires.org/en/fire/almeirim-2026-10?v=2026-11-05A 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 almeirim-2026-10.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026-10-18 | 22 | 858 | 34.3 | 22.5 | 42 | 10.2 | 29.5 | 1.6 | 20.8 | moderado | 1 |
| 2026-10-19 | 33 | 260 | 33.4 | 22.7 | 45 | 11.9 | 33.1 | 1.7 | 22.5 | alto | 1 |
| 2026-10-20 | 12 | 222 | 34.6 | 22.4 | 41 | 12.4 | 35.3 | 0.5 | 23.5 | alto | 1 |
| 2026-10-21 | 39 | 463 | 33.6 | 23.1 | 44 | 15.6 | 42.5 | 1.5 | 31.6 | alto | 1 |
| 2026-10-22 | 46 | 509 | 33.5 | 21.7 | 39 | 15.1 | 43.9 | 0.2 | 36.2 | alto | 1 |
| 2026-10-23 | 45 | 998 | 33.9 | 22 | 36 | 13.1 | 35.6 | 0.6 | 31.3 | alto | 1 |
| 2026-10-24 | 79 | 432 | 35 | 22.6 | 35 | 11.2 | 31 | 0.2 | 35.2 | alto | 1 |
| 2026-10-25 | 61 | 382 | 35.1 | 23 | 37 | 12.1 | 34.2 | 0.3 | 34.5 | alto | 1 |
| 2026-10-26 | 81 | 625 | 34.9 | 23 | 34 | 11.8 | 36.4 | 0 | 35.9 | alto | 1 |
| 2026-10-27 | 77 | 1,205 | 36.2 | 23.1 | 28 | 13 | 33.8 | 0 | 35.5 | alto | 1 |
| 2026-10-28 | 75 | 647 | 35.8 | 23.4 | 30 | 12 | 29.5 | 0.3 | 38.5 | muy_alto | 1 |
| 2026-10-29 | 56 | 168 | 34.1 | 23.7 | 48 | 9.8 | 32.4 | 0.2 | 35 | alto | 1 |
| 2026-10-30 | 79 | 212 | 32.9 | 22.6 | 50 | 10 | 32.8 | 1.4 | 31.9 | alto | 1 |
| 2026-10-31 | 28 | 147 | 34.4 | 21.3 | 36 | 12.3 | 33.8 | 0.1 | 27 | alto | 1 |
| 2026-11-01 | 39 | 253 | 35.3 | 23.1 | 36 | 13 | 35.3 | 0.2 | 32.9 | alto | 1 |
| 2026-11-02 | 10 | 57 | 34 | 23.1 | 48 | 11.8 | 32.4 | 0.8 | 24.5 | alto | 1 |
| 2026-11-03 | 21 | 225 | 33.7 | 23 | 47 | 15.6 | 38.2 | 1.6 | 29.8 | alto | 1 |
| 2026-11-04 | 12 | 27 | 32.9 | 21.6 | 45 | 12.3 | 32.4 | 0.6 | 26.1 | alto | 1 |
| 2026-11-05 | 27 | 60 | 34.3 | 22.6 | 35 | 13.8 | 35.3 | 0.3 | 31 | alto | 1 |
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), ECMWF IFS · Open-Meteo.com (CC BY 4.0), GHSL (JRC). Open-Meteo.com · How we build fire pages: methodology
Is it still active?
Satellites detected fire on 5 Nov 2026, 17:00 UTC. Everything suggests it is still burning. 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.
- Burnt area
- 5,450ha
- GWIS perimeter (Copernicus)
- Duration
- 19days
- 18 Oct 2026 – 5 Nov 2026
- Municipalities hit
- 1
- municipalities
- Started on
- 18 Oct
- 2026
- Heat detections
- 842
- in a single hotspot: 200 MW
- Danger at start
- 21
- Moderate · FWI index
- Average daily power
- 408MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
18 Oct5 Nov
5 Nov 2026
How it evolved, day by day
18 Oct
22 Oct
27 Oct
30 Oct
3 Nov
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
36°high
44km/h · peak gust
28%lowest humidity
It had gone 12 days without rain (1 mm or more) when it started.
This area had burned before
23% of the perimeter overlaps earlier fires recorded since 2016: 1,269 ha in 2024.
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
-
5,488 ha reached on 18 Oct0.1 %
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) · forecast models, provisional until the ERA5 reanalysis arrives
| Day | High | Min. humidity | Peak gust | Rain | Danger (FWI) |
|---|---|---|---|---|---|
| 18 Oct | 34.3 °C | 42 % | 30 km/h | 1.6 mm | Moderate 21 |
| 19 Oct | 33.4 °C | 45 % | 33 km/h | 1.7 mm | High 22 |
| 20 Oct | 34.6 °C | 41 % | 35 km/h | 0.5 mm | High 24 |
| 21 Oct | 33.6 °C | 44 % | 42 km/h | 1.5 mm | High 32 |
| 22 Oct | 33.5 °C | 39 % | 44 km/h | 0.2 mm | High 36 |
| 23 Oct | 33.9 °C | 36 % | 36 km/h | 0.6 mm | High 31 |
| 24 Oct | 35.0 °C | 35 % | 31 km/h | 0.2 mm | High 35 |
| 25 Oct | 35.1 °C | 37 % | 34 km/h | 0.3 mm | High 34 |
| 26 Oct | 34.9 °C | 34 % | 36 km/h | 0.0 mm | High 36 |
| 27 Oct | 36.2 °C | 28 % | 34 km/h | 0.0 mm | High 36 |
| 28 Oct | 35.8 °C | 30 % | 30 km/h | 0.3 mm | Very high 38 |
| 29 Oct | 34.1 °C | 48 % | 32 km/h | 0.2 mm | High 35 |
| 30 Oct | 32.9 °C | 50 % | 33 km/h | 1.4 mm | High 32 |
| 31 Oct | 34.4 °C | 36 % | 34 km/h | 0.1 mm | High 27 |
| 1 Nov | 35.3 °C | 36 % | 35 km/h | 0.2 mm | High 33 |
| 2 Nov | 34.0 °C | 48 % | 32 km/h | 0.8 mm | High 24 |
| 3 Nov | 33.7 °C | 47 % | 38 km/h | 1.6 mm | High 30 |
| 4 Nov | 32.9 °C | 45 % | 32 km/h | 0.6 mm | High 26 |
| 5 Nov | 34.3 °C | 35 % | 35 km/h | 0.3 mm | High 31 |
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
↔
Before · 11 Oct 2026
After · 5 Nov 2026
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 20 October 2026 the air beside the fire reached 33 µg/m³ of PM2.5. That day averaged 20: 1.3 times the WHO daily guideline (15).
PM2.5 peak33 µg/m³
Days over the guideline3 days
PM1035 µg/m³
Optical depth0.50
WHO 15
16 Oct18 Oct20 Oct22 Oct24 Oct
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 · 842Every 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 Almeirim fire last?
- GWIS (Copernicus) dates it between 18 October 2026 and 5 November 2026: 19 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 5,450 hectares (54.5 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Almeirim (5,488 ha, 0.1 %).
- Is the Almeirim fire still active?
- Yes: satellites detected fire on 5 Nov 2026, 17:00 UTC. Check the emergency service for the official status.
- What was the weather like?
- During the fire the temperature reached 36.2 °C, humidity dropped to 28 % and gusts hit 44 km/h. The fire danger index (FWI) reached 38, 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.
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 · 10 Changes in area, dates, name, official record or merged pages, compared every night since 25 October 2026.
- Area: 5,326 → 5,450 ha.
- Area: 4,871 → 5,326 ha.
- Area: 4,623 → 4,871 ha.
- Area: 4,422 → 4,623 ha.
- Area: 4,203 → 4,422 ha.
- Area: 3,906 → 4,203 ha.
- Area: 3,803 → 3,906 ha.
- Area: 3,664 → 3,803 ha.
- Area: 3,491 → 3,664 ha.
- Page published (3,491 ha).
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. 842 Suomi-NPP VIIRS detections on those dates.
- We have not matched this page with any official record.
- Weather: ECMWF IFS model, provisional until the ERA5 reanalysis arrives.
- 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 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.