Burned area
satellite only172ha
Perimeter published by EFFIS (Copernicus).
- Source
- EFFIS (Copernicus)
- Date
- perimeter revised on 26 January 2022
+− cross-check
No official record is matched to this page to compare it with.
PT · Portugal ·
Tendais fire, October 2020 Tendais
Out · last measured on 29 Oct 2020
The fire started on 29 October 2020 in Tendais, Portugal, and satellites saw it burning for 1 day. Copernicus mapped a burnt perimeter of 172 hectares from satellite imagery, spread across a single freguesia.
It is the 21th largest in Cinfães since 2016 (of 31 with a page). Number 47 in Portugal in 2020, of 67.
Use this data
Compare with…
Use this data
Fire page data · version 2026-10-24matches the official recordwith caveatssatellite onlymodel
When copying, the sentence is
Tick the figures you want: they make up the lede and the CSV.
Duration by satellite
satellite only1day
29 Oct 2020 to 29 Oct 2020: first and last day with fire on the page.
- Source
- EFFIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 29 Oct 2020 – 29 Oct 2020
+− cross-check
Satellites pass a few times a day and cloud or smoke can hide the fire: a lack of detections is not an official extinction. Each country’s emergency service declares a fire contained or out.
Start
satellite only29 Oct 2020
First day with fire seen by the satellites or the perimeter.
- Source
- EFFIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 29 Oct 2020
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Danger at the start
model0.1FWI · very low
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 0.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 29 Oct 2020, local noon
- Model
- ERA5 0,25° (ECMWF · Copernicus C3S) · Open-Meteo.com
+− cross-check
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
model13.5°C · 65% RH
High of 13.5 °C and minimum humidity of 65% on 29 October 2020; gusts of 22 km/h on 29 October 2020.
- Source
- weather model at the fire’s grid cell
- Date
- 29 Oct 2020 – 29 Oct 2020
- Model
- ERA5 0,25° (ECMWF · Copernicus C3S) · Open-Meteo.com
+− cross-check
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.
Show
-
· reconstructed weatherWeather and FWI computed from the ERA5 reanalysis
-
· reconstructed perimeterEFFIS (Copernicus) revises the perimeter
What was saved on 24 October 2026
Every night a snapshot of what the page shows is saved. If anything changes, it appears in the list as a log entry.
- Area
- 172 ha
- Dates
- 29 Oct 2020 – 29 Oct 2020
- Name
- Tendais
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/tendais-2020-10?v=2026-10-24A 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
CSV for this fire tendais-2020-10.csv · daily, no individual hotspots
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2020-10-29 | 0 | 0 | 13.5 | 2.8 | 65 | 7.4 | 21.6 | 0 | 0.1 | muy_bajo | 1 |
| 2020-10-30 | 0 | 0 | 17.4 | 5.1 | 60 | 8.3 | 24.1 | 0 | 0.3 | muy_bajo | 0 |
| 2020-10-31 | 0 | 0 | 15.9 | 6.3 | 70 | 11.3 | 31.7 | 0 | 0.4 | muy_bajo | 0 |
| 2020-11-01 | 0 | 0 | 14.4 | 10.1 | 84 | 9.3 | 26.6 | 0.4 | 0.4 | muy_bajo | 0 |
| 2020-11-02 | 0 | 0 | 14 | 8.6 | 88 | 10.2 | 27.7 | 1 | 0.3 | 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.
Live widget for your story
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), ERA5 (ECMWF/Copernicus C3S) · Open-Meteo.com (CC BY 4.0). Open-Meteo.com · How we build fire pages: methodology
We have the Copernicus perimeter for this fire, but the VIIRS sensors did not capture it in enough detail: no day-by-day evolution, but the split by freguesia is there.
- Burnt area
- 172ha
- Copernicus perimeter
- Duration
- 1day
- 29 Oct 2020 – 29 Oct 2020
- Freguesias hit
- 1
- freguesias
- Started on
- 29 Oct
- 2020
- Danger at start
- 0
- Very low · FWI index
- Natura 2000
- 100%
- of the perimeter is protected land
Where it burned
The weather it burned in
14°high
22km/h · peak gust
65%lowest humidity
It had gone 0 days without rain (1 mm or more) when it started. Rain came after the fire: 1.0 mm on 2 Nov.
This area had burned before
99% of the perimeter overlaps earlier fires recorded since 2016: 171 ha in 2016.
What happened to each freguesia
-
172 ha5.4 %
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
- Other natural land79 %
- Scrub and transitional woodland21 %
Natura 2000 protected area affected: 100 %
- LIC Serra de Montemuro PTCON0025
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.
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) |
|---|---|---|---|---|---|
| 29 Oct | 13.5 °C | 65 % | 22 km/h | 0.0 mm | Very low 0 |
| 30 Oct after | 17.4 °C | 60 % | 24 km/h | 0.0 mm | Very low 0 |
| 31 Oct after | 15.9 °C | 70 % | 32 km/h | 0.0 mm | Very low 0 |
| 1 Nov after | 14.4 °C | 84 % | 27 km/h | 0.4 mm | Very low 0 |
| 2 Nov after | 14.0 °C | 88 % | 28 km/h | 1.0 mm | Very low 0 |
Its twins: fires that started in the same weather
It started with an FWI of 0.1, a minimum humidity of 65% and rain the day before. Fires in the area that started in weather like this since 2016: 18.
FWI at the start
0.1
Minimum humidity
65 %
Days without rain
0
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Tendais fire, October 2020
172 ha
1 day
FWI 0.1
Min. humidity 65 %
Nespereira fire, January 2024
467 ha
8 days
FWI 0.5
Min. humidity 64 %
3 km away, in 2024
First rain (1 mm or more) after it ended: 1.4 mm on 7 Feb.
Palas de Rei fire, April 2022
166 ha
1 day
FWI 2.1
Min. humidity 64 %
213 km away, in 2022
First rain (1 mm or more) after it ended: 1.7 mm on 18 Apr.
Lobeira fire, August 2022
640 ha
3 days
FWI 0.7
Min. humidity 62 %
109 km away, in 2022
First rain (1 mm or more) after it ended: 1.0 mm on 29 Aug.
Montalegre fire, January 2021
176 ha
4 days
FWI 0.6
Min. humidity 63 %
83 km away, in 2021
First rain (1 mm or more) after it ended: 47.2 mm on 20 Jan.
Castelo Branco fire, December 2019
124 ha
4 days
FWI 0.5
Min. humidity 60 %
146 km away, in 2019
First rain (1 mm or more) after it ended: 1.4 mm on 12 Dec.
What happened to them
- 1 day
- median duration
- 169 ha
- median area
- 0 %
- went past 1,000 ha
- 2.2 mm
- rain at the end (median; 16 of 18 had it)
It burned an area similar to its twins (172 ha against a median of 169 ha) and lasted 1 day, against 1 day.
In 2 of 18, 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 2.2 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
1.0 mmfirst rain
2 Nov4 days after it ended
22km/h · max. gust
It was considered over on 29 Oct, and on 2 Nov 1.0 mm fell. We do not know whether the rain or the firefighters put it out. Twins with rain when they ended: 16 of 18, with a median of 2.2 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.
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
↔
Before · 22 Oct 2020
After · 5 Nov 2020
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 · CopernicusOn 28 October 2020 the air beside the fire reached 13 µg/m³ of PM2.5, but no daily average passed the WHO guideline (15).
PM2.5 peak13 µg/m³
Days over the guideline0 days
PM1017 µg/m³
27 Oct29 Oct31 Oct
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)
Other fires nearby
- 6,555 haArouca RealJuly 2025 · 5 days · 15 km away
- 35,523 haCastro Daire União das Freguesias de Picão e ErmidaSeptember 2024 · 10 days · 17 km away
- 6,845 haUnião das Freguesias de Campelo e Ovil e Loivos do MonteSeptember 2024 · 3 days · 20 km away
- 8,253 haChaveOctober 2017 · 5 days · 23 km away
- 30,331 haArouca Santa EuláliaAugust 2016 · 9 days · 27 km away
- 78,447 haTrancoso Trancoso (São Pedro e Santa Maria) e Souto MaiorAugust 2025 · 11 days · 36 km away
Frequently asked questions
- How long did the Tendais fire last?
- Copernicus dates it between 29 October 2020 and 29 October 2020: 1 day between the first and last image with fire.
- How much area did it burn?
- The perimeter Copernicus measured from satellite imagery is 172 hectares (1.7 km²). Official national figures may differ.
- Which freguesias burned?
- The fire only entered Tendais (172 ha, 5.4 %).
- Did the fire reach a town?
- The fire started in Tendais and came within 1.7 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 13.5 °C, humidity dropped to 65 % and gusts hit 22 km/h. The fire danger index (FWI) reached 0, class Very low.
- 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: 18. Their median duration was 1 day and their median area 169 ha; 0 % went past 1,000 ha. In 2 of 18, 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 2.2 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.
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.
RSS Changes to this page With cross-checks and a citable version
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. No Suomi-NPP VIIRS detections on those dates.
- We have not matched this page with any official record.
- 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. 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.