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João Costa fire, September 2018 João Costa, São João do Piauí

Out · last detection 6 Oct 2018, 16:31 UTC

The fire started on 25 September 2018 in João Costa, Brazil, and satellites saw it burning for 12 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 3,979 hectares from heat detections, spread across 2 municipalities.

It is the 513th largest in Piaui since 2016 (of 805 with a page). Number 165 in Brazil in 2018, of 291.

Compare with…

Suggestions: São João do Piauí · 2020João Costa · 2020São João do Piauí · 2021

Burnt area
3,979ha
GWIS perimeter (Copernicus)
Duration
12days
25 Sept 2018 – 6 Oct 2018
Municipalities hit
2
municipalities
Started on
25 Sept
2018
Heat detections
183
in a single hotspot: 122 MW
Danger at start
46
Very high · FWI index
Average daily power
220MW
detected power per day, on average

Where it burned

HOTSPOTS BY DAY 25 Sept6 Oct
6 Oct 2018

How it evolved, day by day

25 Sept 2018 · 3 MW · 2 26 Sept 2018 · 2 MW · 1 28 Sept 2018 · 6 MW · 1 29 Sept 2018 · 7 MW · 2 30 Sept 2018 · 172 MW · 16 1 Oct 2018 · 579 MW · 39 2 Oct 2018 · 219 MW · 18 3 Oct 2018 · 631 MW · 36 4 Oct 2018 · 730 MW · 55 5 Oct 2018 · 21 MW · 10 6 Oct 2018 · 47 MW · 3
25 Sept 28 Sept 30 Sept 2 Oct 4 Oct 6 Oct

Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.

The weather it burned in

38°high
46km/h · peak gust
27%lowest humidity

It had gone more than two months without rain (1 mm or more) when it started. Rain came after the fire: 1.1 mm on 15 Oct.

This area had burned before

No earlier perimeters overlap this fire since 2016, when the satellite record begins.

How big is it?

10 km
It burned the equivalent of 2.5% of the area of London (40 km² against 1,583 km²).

London boundary: geoBoundaries · Office for National Statistics (Open Government Licence v3.0).

This compares size, not location: both shapes are at the same scale, north up, centred on each other.

What happened to each town

  1. João Costa 2,970 inhabitants where it started
    2,082 ha reached on 26 Sept
    1.2 %
  2. São João do Piauí 21,421 inhabitants
    1,923 ha reached on 25 Sept
    1.2 %

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 2020
Built-up area0.35 ha
Residents< 20

Inside the perimeter there were about 0.35 hectares of 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)
25 Sept 34.9 °C 31 % 42 km/h 0.0 mm Very high 46
26 Sept 35.6 °C 32 % 41 km/h 0.0 mm Very high 46
27 Sept 36.3 °C 27 % 43 km/h 0.0 mm Very high 46
28 Sept 36.8 °C 27 % 41 km/h 0.0 mm Very high 45
29 Sept 37.8 °C 29 % 40 km/h 0.0 mm Very high 45
30 Sept 35.8 °C 35 % 46 km/h 0.0 mm Very high 43
1 Oct 35.5 °C 31 % 41 km/h 0.0 mm Very high 45
2 Oct 36.0 °C 29 % 39 km/h 0.0 mm Very high 44
3 Oct 36.5 °C 33 % 40 km/h 0.0 mm Very high 43
4 Oct 36.5 °C 34 % 39 km/h 0.0 mm Very high 43
5 Oct 35.4 °C 41 % 35 km/h 0.0 mm High 37
6 Oct 36.1 °C 33 % 37 km/h 0.0 mm Very high 38
7 Oct after 36.4 °C 33 % 43 km/h 0.0 mm Very high 41
8 Oct after 35.8 °C 28 % 46 km/h 0.0 mm Very high 44
9 Oct after 36.4 °C 22 % 44 km/h 0.0 mm Very high 48
10 Oct after 36.6 °C 26 % 43 km/h 0.0 mm Very high 49
11 Oct after 36.5 °C 31 % 43 km/h 0.0 mm Very high 48
12 Oct after 36.2 °C 32 % 42 km/h 0.0 mm Very high 47
13 Oct after 36.0 °C 32 % 38 km/h 0.0 mm Very high 45
14 Oct after 37.9 °C 33 % 31 km/h 0.0 mm Very high 41
15 Oct after 35.7 °C 43 % 24 km/h 1.1 mm High 26

Before and after, from space

Drag the line to compare the same ground before the fire and after it.

Before · 18 Sept 2018
After · 13 Oct 2018

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 · 183Every 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 timeSatelliteFRP (MW)LatLon

Other fires nearby

All fires in Brazil ›

Frequently asked questions

How long did the João Costa fire last?
According to the heat detections seen by satellite inside the perimeter, it burned from 25 September 2018 to 6 October 2018 (12 days). The perimeter dates it from 28 September 2018 to 6 October 2018.
How much area did it burn?
The perimeter GWIS (Copernicus) rebuilt from heat detections is 3,979 hectares (39.8 km²). It is an estimate: official national figures may differ.
Which municipalities burned?
The fire entered 2 municipalities: João Costa (2,082 ha, 1.2 %); São João do Piauí (1,923 ha, 1.2 %).
What was the weather like?
During the fire the temperature reached 37.8 °C, humidity dropped to 27 % and gusts hit 46 km/h. The fire danger index (FWI) reached 46, 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 · 1 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
  1. Start date: 28 September 2018 → 25 September 2018.

RSS Changes to this page

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
What do you think is wrong?

We will only use your email to reply about this report. Privacy. This is not an emergency service: if there is a fire now, call 193.

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 28 September 2018 to 6 October 2018. 183 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.

How we build fire pages: methodology ›

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.