The fire started on 26 August 2017 in Almendra, Portugal, and satellites saw it burning for 2 days. Copernicus mapped a burnt perimeter of 754 hectares from satellite imagery, spread across 3 freguesias. According to ICNF, it was detected on 26 August 2017 at 20:02 and declared extinguished on 28 August 2017.
It is the 3th largest in Vila Nova de Foz Côa since 2016 (of 10 with a page). Number 74 in Portugal in 2017, of 211.
The power measured by the satellite is low (16.8 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.
Perimeter published by EFFIS (Copernicus).
ICNF: 721 ha (matched records: 1). Difference between the page and the official record: +4.6%. Matched on 8 November 2026.
26 Aug 2017 to 27 Aug 2017: first and last day with fire on the page.
ICNF declared the fire extinguished on 28 August 2017. Satellites may still see smouldering spots afterwards.
Alert according to ICNF: 26 August 2017 at 20:02. Official cause: arson.
First day with fire on the page (satellite or perimeter): 26 August 2017.
VIIRS detections at 375 m. Most intense hotspot: 17 MW.
There is no official record to compare with. Each hotspot is a pixel detected in one satellite pass, not a separate fire.
Total radiative power on 27 August 2017; hotspots that day: 2.
Fire radiative power (FRP) measures the energy the fire gives off when the satellite passes. Added up by day, it compares intensity, not area.
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 49.
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
High of 31.9 °C and minimum humidity of 25% on 26 August 2017; gusts of 48 km/h on 27 August 2017.
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 24 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.
Every night a snapshot of what the page shows is saved. If anything changes, it appears in the list as a log entry.
A 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.
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2017-08-26 | 0 | 0 | 31.9 | 17.1 | 25 | 21.7 | 46.1 | 1.4 | 41.8 | muy_alto | 1 |
| 2017-08-27 | 2 | 34 | 27.6 | 17.9 | 46 | 19.1 | 48.2 | 9.4 | 13.2 | moderado | 1 |
| 2017-08-28 | 0 | 0 | 25.4 | 16.1 | 46 | 11.4 | 30.6 | 3.6 | 3.1 | muy_bajo | 0 |
It is generated in your browser from this page’s data: one file per fire, aggregated by day and without individual hotspots.
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: EFFIS (Copernicus), NASA FIRMS (VIIRS), ICNF, ERA5 (ECMWF/Copernicus C3S) · Open-Meteo.com (CC BY 4.0). Open-Meteo.com · How we build fire pages: methodology
27 Aug 2017 · 34 MW · 2
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
It had gone 49 days without rain (1 mm or more) when it started. Rain came after the fire: 3.6 mm on 28 Aug.
No earlier perimeters overlap this fire since 2016, when the satellite record begins.
London boundary: geoBoundaries · Office for National Statistics (Open Government Licence v3.0).
Lisbon boundary: geoBoundaries · geoBoundaries, DG Territory (CC0 1.0).
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).
This compares size, not location: both shapes are at the same scale, north up, centred on each other.
Burnt area inside each freguesia, 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.
Natura 2000 protected area affected: 42 %
Natura 2000 sites (European Environment Agency, 2024 release) crossed by the perimeter.
Land cover inside the perimeter according to Corine Land Cover, as reported by Copernicus.
According to ICNF, this fire started on 26 August 2017 and burned 721 ha (the satellite measured 754 ha).
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.
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) |
|---|---|---|---|---|---|
| 26 Aug | 31.9 °C | 25 % | 46 km/h | 1.4 mm | Very high 42 |
| 27 Aug | 27.6 °C | 46 % | 48 km/h | 9.4 mm | Moderate 13 |
| 28 Aug after | 25.4 °C | 46 % | 31 km/h | 3.6 mm | Very low 3 |
It started with an FWI of 41.8, a minimum humidity of 25% and 49 days without rain. Fires in the area that started in weather like this since 2016: 28.
First rain (1 mm or more) after it ended: none in the following ten days.
First rain (1 mm or more) after it ended: 9.2 mm on 24 Aug.
First rain (1 mm or more) after it ended: none in the following ten days.
First rain (1 mm or more) after it ended: 2.1 mm on 16 Oct.
First rain (1 mm or more) after it ended: 15.6 mm on 17 Oct.
It was 1.7 times larger than the median of its twins and lasted 2 days, against 2 days.
Only 10 of its 28 twins burned more. The weather on the first day does not explain everything: the wind in the following days, the fuel and the firefighting also count. In 9 of 28, not even 1 mm fell in the ten days after the end: they went out without rain. In the rest, the first rainy day brought a median of 2.6 mm.
This is a bank of analogues: it shows what usually happens, not what will happen. With fewer than 15 twins we give no figures. How we calculate it
It was considered over on 27 Aug, and on 28 Aug 3.6 mm fell. We do not know whether the rain or the firefighters put it out. Twins with rain when they ended: 19 of 28, with a median of 2.6 mm.
Weather on this page: Open-Meteo.com (CC BY 4.0) · Copernicus Climate Change Service (ERA5)
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.
On 27 August 2017 the air beside the fire reached 33 µg/m³ of PM2.5. That day averaged 18: 1.2 times the WHO daily 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)
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
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
Satellite cross-check
No changes since 24 October 2026.
RSS Changes to this page With cross-checks and a citable version
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.
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. Freguesia boundaries come from geoBoundaries ADM3 (CC0 1.0 Universal (CC0 1.0) Public Domain Dedication). The area per freguesia is computed by WorldFires by crossing the perimeter with those boundaries, so it may differ slightly from each country’s official figure.