Burned area
satellite only128ha
Perimeter published by EFFIS (Copernicus).
- Source
- EFFIS (Copernicus)
- Date
- perimeter revised on 30 April 2026
+− cross-check
No official record is matched to this page to compare it with.
UK · United Kingdom ·
Na h-Eileanan Siar fire, April 2026 Na h-Eileanan Siar
Out · last measured on 14 Apr 2026
The fire started on 14 April 2026 in Na h-Eileanan Siar, United Kingdom, and satellites saw it burning for 1 day. Copernicus mapped a burnt perimeter of 128 hectares from satellite imagery, spread across a single municipality.
This entry is probably a heather, gorse or hill-grazing burn, not a wildfire. In the UK and Ireland moors and hillsides are burnt every winter and spring to renew grazing or heather. This is our assumption, based on the time of year, ground with almost no woodland and the lack of news about this fire; it is not confirmed. That is why it is left out of the wildfire rankings.
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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
14 Apr 2026 to 14 Apr 2026: first and last day with fire on the page.
- Source
- EFFIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 14 Apr 2026 – 14 Apr 2026
+− 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 only14 Apr 2026
First day with fire seen by the satellites or the perimeter.
- Source
- EFFIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 14 Apr 2026
+− 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
model0.2FWI · 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
- 14 Apr 2026, 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 · 53% RH
High of 13.5 °C and minimum humidity of 53% on 14 April 2026; gusts of 39 km/h on 14 April 2026.
- Source
- weather model at the fire’s grid cell
- Date
- 14 Apr 2026 – 14 Apr 2026
- 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
- 128 ha
- Dates
- 14 Apr 2026 – 14 Apr 2026
- Name
- Na h-Eileanan Siar
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/na-h-eileanan-siar-2026-04?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 na-h-eileanan-siar-2026-04.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026-04-14 | 0 | 0 | 13.5 | 4.6 | 53 | 21.5 | 38.9 | 0.4 | 0.2 | muy_bajo | 1 |
| 2026-04-15 | 0 | 0 | 12.9 | 9.6 | 79 | 29.3 | 55.1 | 10.5 | 0 | 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 not yet its hotspots: NASA publishes the yearly hotspot archive only once the year closes. The page picks it up automatically when it is available.
- Burnt area
- 128ha
- Copernicus perimeter
- Duration
- 1day
- 14 Apr 2026 – 14 Apr 2026
- Municipalities hit
- 1
- districts
- Started on
- 14 Apr
- 2026
- Danger at start
- 0
- Very low · FWI index
Where it burned
The weather it burned in
14°high
39km/h · peak gust
53%lowest humidity
It had gone 0 days without rain (1 mm or more) when it started. Rain came after the fire: 10.5 mm on 15 Apr.
This area had burned before
No earlier perimeters overlap this fire since 2016, when the satellite record begins.
What happened to each town
-
Na h-Eileanan Siar where it started125 ha0.0 %
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
- Other natural land100 %
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) |
|---|---|---|---|---|---|
| 14 Apr | 13.5 °C | 53 % | 39 km/h | 0.4 mm | Very low 0 |
| 15 Apr after | 12.9 °C | 79 % | 55 km/h | 10.5 mm | Very low 0 |
Its twins: fires that started in the same weather
It started with an FWI of 0.2, a minimum humidity of 53% and rain the day before. Fires in the area that started in weather like this since 2016: 16.
FWI at the start
0.2
Minimum humidity
53 %
Days without rain
0
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Na h-Eileanan Siar fire, April 2026
128 ha
1 day
FWI 0.2
Min. humidity 53 %
Highland fire, May 2020
379 ha
2 days
FWI 0.7
Min. humidity 50 %
97 km away, in 2020
First rain (1 mm or more) after it ended: 1.1 mm on 8 May.
Highland fire, April 2020
295 ha
2 days
FWI 3.0
Min. humidity 53 %
121 km away, in 2020
First rain (1 mm or more) after it ended: 3.4 mm on 26 Apr.
Highland fire, April 2025
393 ha
4 days
FWI 0.1
Min. humidity 57 %
145 km away, in 2025
First rain (1 mm or more) after it ended: 2.5 mm on 26 Apr.
Highland fire, April 2024
104 ha
1 day
FWI 0.6
Min. humidity 49 %
173 km away, in 2024
First rain (1 mm or more) after it ended: 4.9 mm on 26 Apr.
Highland fire, May 2017
1,550 ha
2 days
FWI 5.6
Min. humidity 52 %
75 km away, in 2017
First rain (1 mm or more) after it ended: 3.9 mm on 13 May.
What happened to them
- 2 days
- median duration
- 386 ha
- median area
- 31 %
- went past 1,000 ha
- 3.0 mm
- rain at the end (median; 16 of 16 had it)
It stayed below its twins: 128 ha against a median of 386 ha. It lasted 1 day, against 2 days.
All of them had rain in the ten days after the end: the first rainy day brought a median of 3.0 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
10.5 mmfirst rain
15 Aprthe day after it ended
39km/h · max. gust
It was considered over on 14 Apr, and on 15 Apr 10.5 mm fell. We do not know whether the rain or the firefighters put it out. Twins with rain when they ended: 16 of 16, with a median of 3.0 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 · 7 Apr 2026
After · 21 Apr 2026
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 14 April 2026 the air beside the fire reached 4 µg/m³ of PM2.5, but no daily average passed the WHO guideline (15).
PM2.5 peak4 µg/m³
Days over the guideline0 days
PM1014 µg/m³
Optical depth0.21
12 Apr14 Apr16 Apr
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
- 220 haNa h-Eileanan Siar20 March 2022 · 2 days · 7 km away
- 447 haNa h-Eileanan Siar20 March 2022 · 2 days · 8 km away
- 303 haNa h-Eileanan Siar12 April 2019 · 1 day · 9 km away
- 1,122 haNa h-Eileanan Siar26 March 2022 · 3 days · 10 km away
- 197 haNa h-Eileanan Siar9 April 2019 · 1 day · 34 km away
- 261 haNa h-Eileanan Siar11 February 2021 · 2 days · 36 km away
Frequently asked questions
- How long did the Na h-Eileanan Siar fire last?
- Copernicus dates it between 14 April 2026 and 14 April 2026: 1 day between the first and last image with fire.
- How much area did it burn?
- The perimeter Copernicus measured from satellite imagery is 128 hectares (1.3 km²). Official national figures may differ.
- Which municipalities burned?
- The fire only entered Na h-Eileanan Siar (125 ha, 0.0 %).
- What was the weather like?
- During the fire the temperature reached 13.5 °C, humidity dropped to 53 % and gusts hit 39 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 United Kingdom (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: 16. Their median duration was 2 days and their median area 386 ha; 31 % went past 1,000 ha. All of them had rain in the ten days after the end: the first rainy day brought a median of 3.0 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: 999 · 112 · Emergency number and official warnings
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.
- Probably a vegetation burn: not counted in the totals.
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 (Open Government Licence v3.0). 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.