Arraias fire, July 2018 Arraias
The fire started on 20 July 2018 in Arraias, Brazil, and satellites saw it burning for 4 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 4,010 hectares from heat detections, spread across a single municipality.
It is the 815th largest in Tocantins since 2016 (of 1242 with a page). Number 163 in Brazil in 2018, of 291.
The power measured by the satellite is low (27.6 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.
Compare with…
- Burnt area
- 4,010ha
- GWIS perimeter (Copernicus)
- Duration
- 4days
- 20 Jul 2018 – 23 Jul 2018
- Municipalities hit
- 1
- municipalities
- Started on
- 20 Jul
- 2018
- Heat detections
- 109
- in a single hotspot: 28 MW
- Danger at start
- 41
- Very high · FWI index
- Average daily power
- 142MW
- 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 59 days without rain (1 mm or more) when it started.
This area had burned before
4% of the perimeter overlaps earlier fires recorded since 2016: 171 ha in 2017.
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
-
4,030 ha reached on 20 Jul0.7 %
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.
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) |
|---|---|---|---|---|---|
| 20 Jul | 32.1 °C | 27 % | 38 km/h | 0.0 mm | Very high 41 |
| 21 Jul | 32.4 °C | 29 % | 39 km/h | 0.0 mm | Very high 41 |
| 22 Jul | 32.8 °C | 23 % | 36 km/h | 0.0 mm | Very high 39 |
| 23 Jul | 32.5 °C | 24 % | 39 km/h | 0.0 mm | Very high 42 |
| 24 Jul after | 31.9 °C | 29 % | 39 km/h | 0.0 mm | Very high 41 |
| 25 Jul after | 31.7 °C | 31 % | 41 km/h | 0.0 mm | Very high 42 |
| 26 Jul after | 32.0 °C | 29 % | 40 km/h | 0.0 mm | Very high 41 |
| 27 Jul after | 32.2 °C | 27 % | 37 km/h | 0.0 mm | Very high 40 |
| 28 Jul after | 33.2 °C | 24 % | 34 km/h | 0.0 mm | Very high 38 |
| 29 Jul after | 33.1 °C | 25 % | 35 km/h | 0.0 mm | Very high 40 |
| 30 Jul after | 33.5 °C | 24 % | 34 km/h | 0.0 mm | Very high 39 |
| 31 Jul after | 34.2 °C | 25 % | 24 km/h | 0.0 mm | High 34 |
| 1 Aug after | 34.9 °C | 23 % | 28 km/h | 0.0 mm | High 38 |
| 2 Aug after | 35.3 °C | 21 % | 27 km/h | 0.0 mm | Very high 39 |
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 · 109Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
- 10,958 haArraias16 September 2026 · 9 days · 9 km away
- 10,319 haArraias12 August 2025 · 10 days · 9 km away
- 12,392 haArraias10 October 2019 · 12 days · 21 km away
- 39,249 haArraias20 September 2025 · 17 days · 30 km away
- 20,799 haArraias25 September 2026 · 17 days · 38 km away
- 22,189 haArraiasJuly 2021 · 44 days · 40 km away
Frequently asked questions
- How long did the Arraias fire last?
- GWIS (Copernicus) dates it between 20 July 2018 and 23 July 2018: 4 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 4,010 hectares (40.1 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Arraias (4,030 ha, 0.7 %).
- What was the weather like?
- During the fire the temperature reached 32.8 °C, humidity dropped to 23 % and gusts hit 39 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.
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.
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. 109 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.
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.