Santo Tirso fire, September 2024
Carreira e Refojos de Riba de Ave, Monte Córdova, Penamaior
Out · last detection 18 Sept 2024, 14:00 UTC
The fire started on 17 September 2024 in Monte Córdova, Portugal, and satellites saw it burning for 3 days. Copernicus mapped a burnt perimeter of 279 hectares from satellite imagery, spread across 3 freguesias. According to ICNF, it was detected on 17 September 2024 at 12:06 and declared extinguished on 19 September 2024.
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 ›
Weather during the fire
model
25.3°C · 29% RH
High of 25.3 °C and minimum humidity of 29% on 17 September 2024; gusts of 53 km/h on 17 September 2024.
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.
Living inside
model
≈ 100people
Estimated residents inside the perimeter and 2.0 ha of built-up area (100 m grid, epoch 2025).
Source
GHSL R2023A · JRC
Date
calculated on 24 October 2026
+− cross-check
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.
ⓘ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.
Show
· reconstructedofficial
Matched with the official ICNF record
Matches: 273 ha in the official record (records: 1).
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.
Citation
A lede of about 60 words figures only, no adjectives
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
25°high
53km/h · peak gust
29%lowest humidity
It had gone 9 days without rain (1 mm or more) when it started. Rain came after the fire: 4.1 mm on 20 Sept.
This area had burned before
13% of the perimeter overlaps earlier fires recorded since 2016: 19 ha in 2016, 27 ha in 2018, 1 ha in 2022. Part of it burned more than once, so the yearly figures add up to more than the 36 ha that had burned before.
Monte Córdova3,850 inhabitants · 1.0 km from the centrewhere it started
81 hareached on 17 Sept
4.8 %
Penamaior3,586 inhabitants · 1.4 km from the centre
5 hareached on 17 Sept
0.7 %
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.
What burned
Scrub and transitional woodland47 %
Mixed forest43 %
Agricultural areas10 %
Land cover inside the perimeter according to Corine Land Cover, as reported by Copernicus.
People and buildings inside the perimeter
GHSL 2025
Built-up area2.0ha
Residents≈ 100
Inside the perimeter there were about 2.0 hectares of built-up land and about 100 residents (GHSL 2025, 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. The GHSL 2025 epoch is a projection made from 2020 and earlier data.
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)
It stayed below its twins: 279 ha against a median of 696 ha. It lasted 3 days, against 2 days.
In 11 of 21, 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
How it ended
4.1 mmfirst rain
20 Septthe day after it ended
53km/h · max. gust
It was considered over on 19 Sept, and on 20 Sept 4.1 mm fell. We do not know whether the rain or the firefighters put it out. Twins with rain when they ended: 10 of 21, with a median of 2.6 mm.
Weather on this page: Open-Meteo.com (CC BY 4.0) · Copernicus Climate Change Service (ERA5)
How a twin is chosen
Same area: fires that have already ended, less than 250 km from this one, since 2016.
Same start: we compare the FWI on the first day, the minimum humidity that day and the run of days without rain before it. The slider sets how much they may differ.
Only pages with final weather data (ERA5 reanalysis) calculated in the same way as this fire’s; agricultural and grass burns and pages with data under review are left out.
Fires burning at the same time as this one (a week before or after) are left out: they share the same spell of weather and do not count as a precedent.
They are sorted by similarity, and the outlines of the first five are drawn.
Drag the line to compare the same ground before the fire and after it.
↔
Before · 10 Sept 2024
After · 26 Sept 2024
Sentinel-2 did not pass over on that day. Try another date, or use false colour, which is daily.
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 20 September 2024 the air beside the fire reached 151 µg/m³ of PM2.5. That day averaged 76: 5.1 times the WHO daily guideline (15).
PM2.5 peak151µg/m³
Days over the guideline4days
PM10174µg/m³
Optical depth5.33
WHO 15
15 Sept17 Sept19 Sept21 Sept
GoodFairModeratePoorVery poorExtremely 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· 29Every satellite heat detection, one by one, with time, satellite, power and coordinates.›
⬇ Download CSVTimes in UTC. Each detection is a 375 m pixel: a large fire yields hundreds per pass.
Copernicus dates it between 17 September 2024 and 19 September 2024: 3 days between the first and last image with fire. According to ICNF, it was detected on 17 September 2024 at 12:06 and declared extinguished on 19 September 2024.
How much area did it burn?
The perimeter Copernicus measured from satellite imagery is 279 hectares (2.8 km²). Official national figures may differ.
Which freguesias burned?
The fire entered 3 freguesias: Carreira e Refojos de Riba de Ave (193 ha, 21 %); Monte Córdova (81 ha, 4.8 %); Penamaior (5 ha, 0.7 %).
Did the fire reach a town?
The fire started in Monte Córdova and came within 1.0 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 25.3 °C, humidity dropped to 29 % and gusts hit 53 km/h. The fire danger index (FWI) reached 52, class Extreme.
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.
How did the fires that started in similar weather in this area end?
Fires less than 250 km away that started since 2016 with a similar FWI, humidity and dry spell: 21. Their median duration was 2 days and their median area 696 ha; 24 % went past 1,000 ha. In 11 of 21, 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.
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.
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 errorHow we know this›
Perimeter: EFFIS (Copernicus), mapped on satellite imagery.
Dates from the perimeter: the VIIRS detections inside it did not change them. 29 Suomi-NPP VIIRS detections on those dates.
Compared with ICNF: 273 official ha against 279 ha of perimeter; they agree within 25%.
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 2025, 100 m cells), summed inside the perimeter: an estimate of what was there, not a damage count.
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.