How long did the Arcos de Valdevez fire last?

According to the heat detections seen by satellite inside the perimeter, it burned from 10 October 2017 to 15 October 2017 (6 days). The perimeter dates it from 10 October 2017 to 11 October 2017. According to ICNF, the largest of the 5 recorded fires was detected on 9 October 2017 at 23:14 and declared extinguished on 10 October 2017.

How much area did it burn?

The perimeter Copernicus measured from satellite imagery is 260 hectares (2.6 km²). Official national figures may differ.

Which municipalities burned?

The fire entered 3 municipalities: Rio Frio (225 ha, 12 %); União das Freguesias de Bico e Cristelo (34 ha, 2.9 %); Senharei (1 ha, 0.1 %).

Did the fire reach a town?

The fire started in Rio Frio and came within 0.9 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 22.4 °C, humidity dropped to 28 % and gusts hit 24 km/h. The fire danger index (FWI) reached 20, class Moderate.

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.

PT · Portugal · 2017-10-10 → 2017-10-15

Arcos de Valdevez fire, October 2017 Rio Frio, União das Freguesias de Bico e Cristelo, Senharei

Out · last detection 15 Oct 2017, 03:15 UTC

The fire started on 10 October 2017 in Rio Frio, Portugal, and satellites saw it burning for 6 days. Copernicus mapped a burnt perimeter of 260 hectares from satellite imagery, spread across 3 municipalities. According to ICNF, the largest of the 5 recorded fires was detected on 9 October 2017 at 23:14 and declared extinguished on 10 October 2017.

It is the 12th largest in Arcos de Valdevez since 2016 (of 29 with a page). Number 131 in Portugal in 2017, of 211.

The power measured by the satellite is low (20.6 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…

Suggestions: Arcos de Valdevez · 2016 Cabração e Moreira do Lima · 2016 Monção · 2017 Ponte da Barca · 2025

Burnt area: 260ha; Copernicus perimeter
Duration: 6days; 10 Oct 2017 – 15 Oct 2017
Municipalities hit: 3; freguesias
Started on: 10 Oct; 2017
Heat detections: 20; in a single hotspot: 21 MW
Danger at start: 20; Moderate · FWI index
Average daily power: 45MW; detected power per day, on average

HOTSPOTS BY DAY 10 Oct15 Oct

Play back 15 Oct 2017

How it evolved, day by day

10 Oct 11 Oct 12 Oct 15 Oct

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

The weather it burned in

22°high

24km/h · peak gust

28%lowest humidity

It had gone 15 days without rain (1 mm or more) when it started. Rain came after the fire: 14.7 mm on 16 Oct.

This area had burned before

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

What happened to each town

Rio Frio 536 inhabitants · 0.9 km from the centre where it started

225 ha reached on 10 Oct

12 %
União das Freguesias de Bico e Cristelo 734 inhabitants · 1.4 km from the centre

34 ha

2.9 %
Senharei 164 inhabitants · 1.7 km from the centre

1 ha

0.1 %

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

Scrub and transitional woodland57 %
Other natural land25 %
Broadleaved forest11 %
Agricultural areas6.2 %

Natura 2000 protected area affected: 65 %

LIC Corno do Bico PTCON0040

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.

Official record

Complex of 5 fires according to ICNF

According to ICNF, 5 fires started inside this perimeter on these dates, totalling 225 ha (the satellite measured 260 ha).

ICNF records each fire that started at a different time or place separately; the satellite sees a single burned area, so this page groups them together. The numbers on the map show where each one started.

When each one burned

1 170 ha 2 18 ha 3 8 ha 4 14 ha 5 15 ha

9 Oct16 Oct

negligence rekindling arson

1 Arcos de Valdevez Rio Frio 9 October 2017 · 23:14 170 ha · extinguished on 10 October 2017 · cause: negligence
2 Arcos de Valdevez Rio Frio 11 October 2017 · 08:04 18 ha · extinguished on 11 October 2017 · cause: rekindling
3 Paredes de Coura Bico 11 October 2017 · 14:58 8 ha · extinguished on 11 October 2017 · cause: arson
4 Paredes de Coura Bico 14 October 2017 · 19:54 14 ha · extinguished on 15 October 2017 · cause: arson
5 Paredes de Coura Bico 15 October 2017 · 09:28 15 ha · extinguished on 15 October 2017 · cause: arson

Total according to ICNF: 225 ha, 86 % of the 260 ha in the satellite perimeter.

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)
10 Oct	22.4 °C	28 %	21 km/h	0.0 mm	Moderate 20
11 Oct	20.0 °C	32 %	24 km/h	0.0 mm	Moderate 18
12 Oct	24.3 °C	28 %	19 km/h	0.0 mm	Moderate 19
13 Oct	20.4 °C	46 %	22 km/h	0.0 mm	Moderate 15
14 Oct	24.4 °C	32 %	36 km/h	0.0 mm	Moderate 20
15 Oct	28.4 °C	26 %	57 km/h	0.4 mm	High 30
16 Oct after	18.9 °C	58 %	52 km/h	14.7 mm	Very low 0

Before and after, from space

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

↔

Before · 3 Oct 2017

After · 22 Oct 2017

Before After

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 16 October 2017 the air beside the fire reached 85 µg/m³ of PM2.5. That day averaged 43: 2.9 times the WHO daily guideline (15).

PM2.5 peak85 µg/m³

Days over the guideline4 days

PM10128 µg/m³

WHO 15

89101112131415161718

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 · 20Every 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 time	Satellite	FRP (MW)	Lat	Lon

Other fires nearby

All fires in Portugal ›

Frequently asked questions

How long did the Arcos de Valdevez fire last?: According to the heat detections seen by satellite inside the perimeter, it burned from 10 October 2017 to 15 October 2017 (6 days). The perimeter dates it from 10 October 2017 to 11 October 2017. According to ICNF, the largest of the 5 recorded fires was detected on 9 October 2017 at 23:14 and declared extinguished on 10 October 2017.
How much area did it burn?: The perimeter Copernicus measured from satellite imagery is 260 hectares (2.6 km²). Official national figures may differ.
Which municipalities burned?: The fire entered 3 municipalities: Rio Frio (225 ha, 12 %); União das Freguesias de Bico e Cristelo (34 ha, 2.9 %); Senharei (1 ha, 0.1 %).
Did the fire reach a town?: The fire started in Rio Frio and came within 0.9 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 22.4 °C, humidity dropped to 28 % and gusts hit 24 km/h. The fire danger index (FWI) reached 20, class Moderate.
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 ›

Satellite cross-check

NASA FIRMS ↗
EFFIS · Copernicus ↗

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.

RSS Changes to this page

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.

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What really happened?

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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.

How we know this

Perimeter: EFFIS (Copernicus), mapped on satellite imagery.
Dates adjusted with the VIIRS detections inside the perimeter, which said 10 October 2017 to 11 October 2017. 20 Suomi-NPP VIIRS detections on those dates.
Compared with ICNF: 225 official ha against 260 ha of perimeter; they agree within 25%.
Weather: Copernicus ERA5 reanalysis at the fire location, in cells of about 25 km.

How we build fire pages: methodology ›

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.

Where it burned