Chaves fire, August 2024 Outeiro Seco, Santa Cruz/Trindade e Sanjurge
The fire started on 3 August 2024 in Outeiro Seco, Portugal, and satellites saw it burning for 1 day. Copernicus mapped a burnt perimeter of 146 hectares from satellite imagery, spread across 2 municipalities. According to ICNF, it was detected on 3 August 2024 at 13:41 and declared extinguished on 3 August 2024.
It is the 13th largest in Chaves since 2016 (of 13 with a page). Number 61 in Portugal in 2024, of 69.
The power measured by the satellite is low (21.6 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
- 146ha
- Copernicus perimeter
- Duration
- 1day
- 3 Aug 2024 – 3 Aug 2024
- Municipalities hit
- 2
- freguesias
- Started on
- 3 Aug
- 2024
- Heat detections
- 3
- in a single hotspot: 22 MW
- Danger at start
- 29
- High · FWI index
- Average daily power
- 65MW
- detected power per day, on average
Where it burned
How it evolved, day by day
3 Aug 2024 · 65 MW · 3
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 3 days without rain (1 mm or more) when it started. Rain came after the fire: 2.5 mm on 13 Aug.
This area had burned before
No earlier perimeters overlap this fire since 2016, when the satellite record begins.
What happened to each town
-
145 ha reached on 3 Aug9.5 %
-
Santa Cruz/Trindade e Sanjurge 3,381 inhabitants · 2.2 km from the centre1 ha0.0 %
Burnt area inside each municipality, from crossing the official 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.
What burned
- Other natural land57 %
- Scrub and transitional woodland21 %
- Agricultural areas19 %
- Artificial surfaces2.8 %
Land cover inside the perimeter according to Corine Land Cover, as reported by Copernicus.
Official record
According to ICNF, this fire started on 3 August 2024 and burned 140 ha (the satellite measured 146 ha).
- Chaves Outeiro Seco 3 August 2024 · 13:41 140 ha · extinguished on 3 August 2024 · cause: arson
ICNF (Instituto da Conservação da Natureza e das Florestas). This is the agency’s operational record: its figures may be revised when the year’s statistics are closed.
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) |
|---|---|---|---|---|---|
| 3 Aug | 32.6 °C | 31 % | 30 km/h | 0.0 mm | High 29 |
| 4 Aug after | 34.3 °C | 31 % | 27 km/h | 0.0 mm | High 29 |
| 5 Aug after | 32.5 °C | 33 % | 35 km/h | 0.0 mm | High 33 |
| 6 Aug after | 30.4 °C | 44 % | 31 km/h | 0.4 mm | High 28 |
| 7 Aug after | 32.3 °C | 39 % | 20 km/h | 0.0 mm | High 24 |
| 8 Aug after | 33.6 °C | 36 % | 24 km/h | 0.0 mm | High 27 |
| 9 Aug after | 35.7 °C | 33 % | 21 km/h | 0.0 mm | High 29 |
| 10 Aug after | 36.4 °C | 25 % | 26 km/h | 0.0 mm | High 33 |
| 11 Aug after | 35.1 °C | 33 % | 35 km/h | 0.0 mm | Very high 39 |
| 12 Aug after | 30.5 °C | 43 % | 34 km/h | 0.0 mm | High 33 |
| 13 Aug after | 25.4 °C | 49 % | 37 km/h | 2.5 mm | Low 9 |
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.
The smoke
CAMS · CopernicusOn 1 August 2024 the air beside the fire reached 19 µg/m³ of PM2.5, but no daily average passed the WHO guideline (15).
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 · 3Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
- 3,493 haVilarelho Da RaiaAugust 2025 · 2 days · 6 km away
- 3,127 haChaves BusteloJuly 2022 · 5 days · 6 km away
- 24,471 haMonterreiAugust 2025 · 8 days · 23 km away
- 13,065 haValpaços ErvõesJuly 2026 · 6 days · 23 km away
- 3,405 haVinhais Vale das Fontes28 August 2025 · 3 days · 32 km away
- 7,641 haMurça TresminasJuly 2022 · 5 days · 33 km away
Frequently asked questions
- How long did the Chaves fire last?
- Copernicus dates it between 3 August 2024 and 3 August 2024: 1 day between the first and last image with fire. According to ICNF, it was detected on 3 August 2024 at 13:41 and declared extinguished on 3 August 2024.
- How much area did it burn?
- The perimeter Copernicus measured from satellite imagery is 146 hectares (1.5 km²). Official national figures may differ.
- Which municipalities burned?
- The fire entered 2 municipalities: Outeiro Seco (145 ha, 9.5 %); Santa Cruz/Trindade e Sanjurge (1 ha, 0.0 %).
- Did the fire reach a town?
- The fire started in Outeiro Seco and came within 0.8 km of its centre. That is the distance from the perimeter, or the nearest hotspot, to the point marking the centre; it does not mean it entered the houses.
- What was the weather like?
- During the fire the temperature reached 32.6 °C, humidity dropped to 31 % and gusts hit 30 km/h. The fire danger index (FWI) reached 29, class High.
- Where does this data come from?
- From the EFFIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Portugal (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: 112 · Emergency number and official warnings ›
- ICNF · Instituto da Conservação da Natureza e das Florestas ↗
- ANEPC · Proteção Civil ↗
- Fogos.pt (ocorrências em tempo real) ↗
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: EFFIS (Copernicus), mapped on satellite imagery.
- Dates from the perimeter: the VIIRS detections inside it did not change them. 3 Suomi-NPP VIIRS detections on those dates.
- Compared with ICNF: 140 official ha against 146 ha of perimeter; they agree within 25%.
- Weather: Copernicus ERA5 reanalysis at the fire location, in cells of about 25 km.
Where this data comes from
The perimeter and land cover come from the Copernicus European Forest Fire Information System (EFFIS), measured on MODIS and Sentinel-2 imagery and published under CC BY 4.0. 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 ADM3 (CC0 1.0 Universal (CC0 1.0) Public Domain Dedication). The area per municipality is computed by WorldFires by crossing the perimeter with those boundaries, so it may differ slightly from each country’s official figure.