Prainha fire, September 2017 Prainha, Monte Alegre
The fire started on 7 September 2017 in Prainha, Brazil, and satellites saw it burning for 5 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 3,214 hectares from heat detections, spread across 2 municipalities.
It is the 998th largest in Pará since 2016 (of 1096 with a page). Number 892 in Brazil in 2017, of 994.
The power measured by the satellite is low (29.4 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.
- Burnt area
- 3,214ha
- GWIS perimeter (Copernicus)
- Duration
- 5days
- 7 Sept 2017 – 11 Sept 2017
- Municipalities hit
- 2
- municipalities
- Started on
- 7 Sept
- 2017
- Heat detections
- 90
- in a single hotspot: 29 MW
- Danger at start
- 22
- High · FWI index
- Energy released
- 474MW
- sum of detected power
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 8 days without rain (1 mm or more) when it started. Rain came after the fire: 3.3 mm on 21 Sept.
This area had burned before
No earlier perimeters overlap this fire since 2016, when the satellite record begins.
What happened to each town
-
3,060 ha reached on 7 Sept0.2 %
-
Monte Alegre 69,377 inhabitants174 ha reached on 8 Sept0.0 %
Burnt area inside each municipality, from crossing the GWIS perimeter with administrative boundaries. The distance is from the town centre 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) |
|---|---|---|---|---|---|
| 7 Sept | 33.0 °C | 48 % | 41 km/h | 0.0 mm | High 22 |
| 8 Sept | 33.1 °C | 52 % | 41 km/h | 0.0 mm | High 22 |
| 9 Sept | 34.3 °C | 46 % | 45 km/h | 0.2 mm | High 23 |
| 10 Sept | 34.4 °C | 48 % | 45 km/h | 0.4 mm | High 22 |
| 11 Sept | 34.4 °C | 44 % | 44 km/h | 0.0 mm | High 24 |
| 12 Sept after | 32.8 °C | 53 % | 48 km/h | 0.4 mm | High 25 |
| 13 Sept after | 32.9 °C | 52 % | 52 km/h | 0.6 mm | High 22 |
| 14 Sept after | 34.3 °C | 44 % | 46 km/h | 0.0 mm | High 26 |
| 15 Sept after | 35.1 °C | 44 % | 35 km/h | 0.3 mm | High 24 |
| 16 Sept after | 34.3 °C | 51 % | 36 km/h | 0.6 mm | Moderate 21 |
| 17 Sept after | 33.6 °C | 53 % | 47 km/h | 0.5 mm | High 22 |
| 18 Sept after | 33.9 °C | 50 % | 42 km/h | 0.3 mm | High 23 |
| 19 Sept after | 35.3 °C | 40 % | 31 km/h | 0.5 mm | High 26 |
| 20 Sept after | 35.3 °C | 42 % | 33 km/h | 0.2 mm | High 28 |
| 21 Sept after | 34.2 °C | 47 % | 42 km/h | 3.3 mm | Low 10 |
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 · 90Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
Frequently asked questions
- How long did the Prainha fire last?
- GWIS (Copernicus) dates it between 7 September 2017 and 11 September 2017: 5 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 3,214 hectares (32.1 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 2 municipalities: Prainha (3,060 ha, 0.2 %); Monte Alegre (174 ha, 0.0 %).
- What was the weather like?
- During the fire the temperature reached 35.1 °C, humidity dropped to 44 % and gusts hit 52 km/h. The fire danger index (FWI) reached 26, class 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
Satellite cross-check
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
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.