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Resoba fire, August 2025 La Pernía, Cervera de Pisuerga, Polentinos

Out · last detection 14 Aug 2025, 14:15 UTC

The fire started on 10 August 2025 in La Pernía, Spain, and satellites saw it burning for 4 days. Copernicus mapped a burnt perimeter of 1,603 hectares from satellite imagery, spread across 3 municipalities.

Number 36 in Spain in 2025, of 158.

Burnt area
1,603ha
Copernicus perimeter
Duration
4days
10 Aug 2025 – 13 Aug 2025
Municipalities hit
3
municipalities
Started on
10 Aug
2025
Heat detections
212
in a single hotspot: 160 MW
Danger at start
34
High · FWI index
Energy released
5.9GW
sum of detected power

Where it burned

14 Aug 2025
HOTSPOTS BY DAY 10 Aug13 Aug

How it evolved, day by day

1011121314

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

The weather it burned in

29°high
54km/h · peak gust
16%lowest humidity

It had gone 12 days without rain (1 mm or more) when it started. Rain came after the fire: 1.2 mm on 19 Aug.

This area had burned before

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

What happened to each town

  1. La Pernía 297 inhabitants · 4.4 km from the town where it started
    860 ha reached on 10 Aug
    5.2 %
  2. Cervera de Pisuerga 2,272 inhabitants · 10.6 km from the town
    569 ha reached on 10 Aug
    1.7 %
  3. Polentinos 41 inhabitants · 3.1 km from the town
    176 ha reached on 12 Aug
    12 %

Burnt area inside each municipality, from crossing the official 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.

What burned

  • Other natural land87 %
  • Broadleaved forest13 %

Natura 2000 protected area affected: 100 %

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.

Checked against the press

Checked on 30 September 2026

We checked this page against 4 sources published once the fire was out. This is what they add:

Also known as
Incendio de Resoba · Incendio de la Montaña Palentina · Incendio del Alto Pisuerga
Official area reported: 1,300 ha (the satellite measured 1,603 ha)
Declared extinguished: 27 September 2025

Sources

Official figures are measured differently from satellite ones and sometimes cover only part of the fire.

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)
10 Aug 29.0 °C 16 % 43 km/h 0.0 mm High 34
11 Aug 28.3 °C 17 % 43 km/h 0.0 mm Very high 40
12 Aug 27.9 °C 16 % 54 km/h 0.4 mm Very high 39
13 Aug 22.8 °C 31 % 41 km/h 2.6 mm Low 7
14 Aug after 25.7 °C 27 % 41 km/h 0.0 mm High 25
15 Aug after 27.2 °C 21 % 43 km/h 0.0 mm High 28
16 Aug after 28.4 °C 14 % 35 km/h 0.0 mm Very high 42
17 Aug after 27.9 °C 20 % 46 km/h 0.2 mm Very high 49
18 Aug after 14.5 °C 77 % 28 km/h 0.3 mm Moderate 15
19 Aug after 14.0 °C 56 % 29 km/h 1.2 mm Low 6

Before and after, from space

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

Before · 3 Aug 2025
After · 20 Aug 2025

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 · Copernicus

On 13 August 2025 the air beside the fire reached 171 µg/m³ of PM2.5. That day averaged 99: 6.6 times the WHO daily guideline (15).

PM2.5 peak171 µg/m³
Days over the guideline4 days
PM10260 µg/m³
Optical depth0.68
8910111213141516
Good Fair Moderate Poor Very poor Extremely poor

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 · 212Every 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 Spain ›

Frequently asked questions

How long did the Resoba fire last?
Copernicus dates it between 10 August 2025 and 13 August 2025: 4 days between the first and last image with fire.
How much area did it burn?
The perimeter Copernicus measured from satellite imagery is 1,603 hectares (16.0 km²). Official national figures may differ.
Which municipalities burned?
The fire entered 3 municipalities: La Pernía (860 ha, 5.2 %); Cervera de Pisuerga (569 ha, 1.7 %); Polentinos (176 ha, 12 %).
Did the fire reach a town?
The closest fire to a town centre came within 3.1 km of Polentinos. That is the distance to the perimeter or nearest hotspot; it does not mean it entered the houses.
What was the weather like?
During the fire the temperature reached 29.0 °C, humidity dropped to 16 % and gusts hit 54 km/h. The fire danger index (FWI) reached 40, class Very high.
Where does this data come from?
From the EFFIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Spain (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

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
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 112.

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 (Creative Commons Attribution 4.0 International (CC BY 4.0)). 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.