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Novoaidar fire, August 2025 Новоайдарський район · Novoaidar, Slovianoserbsk

Out · last detection 22 Aug 2025, 10:03 UTC

The fire started on 21 August 2025 in Novoaidar, Ukraine, and satellites saw it burning for 3 days. Copernicus mapped a burnt perimeter of 523 hectares from satellite imagery, spread across 2 municipalities.

It is the 160th largest in Luhansk Oblast since 2016 (of 909 with a page). Number 161 in Ukraine in 2025, of 1358.

Compare with…

Suggestions: Kreminna · 2024Popasna · 2026Novoaidar · 2022Novoaidar · 2024

Burnt area
523ha
Copernicus perimeter
Duration
3days
21 Aug 2025 – 23 Aug 2025
Municipalities hit
2
districts
Started on
21 Aug
2025
Heat detections
5
in a single hotspot: 60 MW
Danger at start
49
Very high · FWI index
Average daily power
37MW
detected power per day, on average

Where it burned

HOTSPOTS BY DAY 21 Aug23 Aug
22 Aug 2025

How it evolved, day by day

21 Aug 2025 · 71 MW · 4 22 Aug 2025 · 4 MW · 1
21 Aug 22 Aug

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

The weather it burned in

34°high
44km/h · peak gust
15%lowest humidity

It had gone 17 days without rain (1 mm or more) when it started. Rain came after the fire: 2.8 mm on 25 Aug.

This area had burned before

64% of the perimeter overlaps earlier fires recorded since 2016: 154 ha in 2022, 94 ha in 2023, 135 ha in 2024. Part of it burned more than once, so the yearly figures add up to more than the 334 ha that had burned before.

How big is it?

10 km
It burned the equivalent of 0.3% of the area of London (5.2 km² against 1,583 km²).

London boundary: geoBoundaries · Office for National Statistics (Open Government Licence v3.0).

This compares size, not location: both shapes are at the same scale, north up, centred on each other.

What happened to each town

  1. Novoaidar Новоайдарський район 25,086 inhabitants · 14.4 km from the centre where it started
    498 ha reached on 21 Aug
    0.3 %
  2. Slovianoserbsk Слов'яносербський район 53,784 inhabitants · 13.5 km from the centre
    23 ha reached on 22 Aug
    0.0 %

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 land58 %
  • Mixed forest25 %
  • Coniferous forest17 %

Land cover inside the perimeter as reported by Copernicus EFFIS (outside the Corine Land Cover area).

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)
21 Aug 30.7 °C 16 % 32 km/h 0.0 mm Very high 49
22 Aug 33.8 °C 15 % 38 km/h 0.0 mm Extreme 65
23 Aug 32.6 °C 22 % 44 km/h 0.1 mm Extreme 68
24 Aug after 24.3 °C 27 % 38 km/h 0.0 mm Extreme 56
25 Aug after 20.8 °C 38 % 50 km/h 2.8 mm Moderate 18

Its twins: fires that started in the same weather

It started with an FWI of 49.1, a minimum humidity of 16% and 17 days without rain. Fires in the area that started in weather like this since 2016: 15.

FWI at the start 49.1
Minimum humidity 16 %
Days without rain 17
this fire chosen twins rest of the area
Almost identicalSimilar

Outlines of the closest twins

Kreminna fire, August 2024
185 ha 4 days FWI 49.0 Min. humidity 16 % 64 km away, in 2024

First rain (1 mm or more) after it ended: none in the following ten days.

See its page Compare with this fire

What happened to them

3 days
median duration
195 ha
median area
0 %
went past 1,000 ha
4.7 mm
rain at the end (median; 11 of 15 had it)

It was 2.7 times larger than the median of its twins and lasted 3 days, against 3 days.

Only 2 of its 15 twins burned more. The weather on the first day does not explain everything: the wind in the following days, the fuel and the firefighting also count. In 4 of 15, 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 4.7 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

2.8 mmfirst rain
25 Aug2 days after it ended
44km/h · max. gust

It was considered over on 23 Aug, and on 25 Aug 2.8 mm fell. We do not know whether the rain or the firefighters put it out. Twins with rain when they ended: 11 of 15, with a median of 4.7 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.

How we calculate it

Before and after, from space

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

Before · 14 Aug 2025
After · 30 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 22 August 2025 the air beside the fire reached 28 µg/m³ of PM2.5, but no daily average passed the WHO guideline (15).

PM2.5 peak28 µg/m³
Days over the guideline0 days
PM1032 µg/m³
Optical depth0.43
19 Aug21 Aug23 Aug25 Aug
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 · 5Every 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 Ukraine

Frequently asked questions

How long did the Novoaidar fire last?
Copernicus dates it between 21 August 2025 and 23 August 2025: 3 days between the first and last image with fire.
How much area did it burn?
The perimeter Copernicus measured from satellite imagery is 523 hectares (5.2 km²). Official national figures may differ.
Which municipalities burned?
The fire entered 2 municipalities: Novoaidar (498 ha, 0.3 %); Slovianoserbsk (23 ha, 0.0 %).
Did the fire reach a town?
The fire came within 13.5 km of the centre of Slovianoserbsk, the closest of the areas it touched. 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 33.8 °C, humidity dropped to 15 % and gusts hit 44 km/h. The fire danger index (FWI) reached 68, class Extreme.
Where does this data come from?
From the EFFIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Ukraine (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: 15. Their median duration was 3 days and their median area 195 ha; 0 % went past 1,000 ha. Only 2 of its 15 twins burned more. The weather on the first day does not explain everything: the wind in the following days, the fuel and the firefighting also count. In 4 of 15, 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 4.7 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: 101 · 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
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 101 · 112.

How we know this
  • Perimeter: EFFIS (Copernicus), mapped on satellite imagery.
  • Dates from the perimeter: the VIIRS detections inside it did not change them. 5 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.

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 ADM2 (Public Domain). 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.