Burned area
satellite only305ha
Perimeter published by EFFIS (Copernicus).
- Source
- EFFIS (Copernicus)
- Date
- perimeter revised on 14 July 2025
+− cross-check
No official record is matched to this page to compare it with.
UA · Ukraine · –
Sloviansk fire, 8 July 2025 Слов'янський район · Sloviansk, Bakhmut, Kostiantynivka
Out · last detection 12 Jul 2025, 11:13 UTC
The fire started on 8 July 2025 in Sloviansk, Ukraine, and satellites saw it burning for 5 days. Copernicus mapped a burnt perimeter of 305 hectares from satellite imagery, spread across 3 municipalities.
It is the 240th largest in Donetsk Oblast since 2016 (of 1004 with a page). Number 382 in Ukraine in 2025, of 1358.
The power measured by the satellite is low (20.3 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.
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 only5days
8 Jul 2025 to 12 Jul 2025: first and last day with fire on the page.
- Source
- EFFIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 12 Jul 2025, 11:13 UTC
+− 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 only8 Jul 2025
First day with fire seen by the satellites or the perimeter.
- Source
- EFFIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 8 Jul 2025
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only7
VIIRS detections at 375 m. Most intense hotspot: 20 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP + NOAA-20)
- Date
- 8 Jul 2025 – 12 Jul 2025
+− cross-check
There is no official record to compare with. Each hotspot is a pixel detected in one satellite pass, not a separate fire.
The worst day
satellite only38MW
Total radiative power on 9 July 2025; hotspots that day: 5.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 9 Jul 2025
+− cross-check
Fire radiative power (FRP) measures the energy the fire gives off when the satellite passes. Added up by day, it compares intensity, not area.
Danger at the start
model30.7FWI · high
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 5.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 8 Jul 2025, 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
model37.5°C · 9% RH
High of 37.5 °C and minimum humidity of 9% on 10 July 2025; gusts of 49 km/h on 9 July 2025.
- Source
- weather model at the fire’s grid cell
- Date
- 8 Jul 2025 – 12 Jul 2025
- 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 GHSLPopulation and built-up area computed
-
· 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
- 305 ha
- Dates
- 8 Jul 2025 – 12 Jul 2025
- Name
- Sloviansk
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/sloviansk-2025-07-3?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 sloviansk-2025-07-3.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025-07-08 | 0 | 0 | 36.8 | 19.7 | 13 | 14.3 | 29.5 | 0 | 30.7 | alto | 1 |
| 2025-07-09 | 5 | 38 | 36 | 22.6 | 9 | 27 | 49.3 | 0 | 47.7 | muy_alto | 1 |
| 2025-07-10 | 1 | 8 | 37.5 | 20.9 | 9 | 21.4 | 42.8 | 0 | 45 | muy_alto | 1 |
| 2025-07-11 | 0 | 0 | 36.8 | 24.2 | 19 | 22.5 | 45 | 0.5 | 45.2 | muy_alto | 1 |
| 2025-07-12 | 1 | 3 | 37.5 | 22 | 18 | 8.8 | 23.8 | 0 | 34 | alto | 1 |
| 2025-07-13 | 0 | 0 | 36.4 | 20.9 | 22 | 14.1 | 31.3 | 0.5 | 37.5 | alto | 0 |
| 2025-07-14 | 0 | 0 | 31.7 | 20.9 | 29 | 14.8 | 36.7 | 0.1 | 32.8 | alto | 0 |
| 2025-07-15 | 0 | 0 | 32.4 | 19.2 | 25 | 15.8 | 36.4 | 0 | 34.5 | alto | 0 |
| 2025-07-16 | 0 | 0 | 31.9 | 18.3 | 26 | 9.7 | 25.6 | 0 | 30.5 | alto | 0 |
| 2025-07-17 | 0 | 0 | 31.8 | 18.7 | 28 | 15.9 | 29.9 | 0.2 | 35.4 | alto | 0 |
| 2025-07-18 | 0 | 0 | 34 | 19.1 | 30 | 12.4 | 29.9 | 1.3 | 23.2 | alto | 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), GHSL (JRC). Open-Meteo.com · How we build fire pages: methodology
- Burnt area
- 305ha
- Copernicus perimeter
- Duration
- 5days
- 8 Jul 2025 – 12 Jul 2025
- Municipalities hit
- 3
- districts
- Started on
- 8 Jul
- 2025
- Heat detections
- 7
- in a single hotspot: 20 MW
- Danger at start
- 31
- High · FWI index
- Average daily power
- 16MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
8 Jul12 Jul
12 Jul 2025
How it evolved, day by day
9 Jul
10 Jul
12 Jul
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
38°high
49km/h · peak gust
9%lowest humidity
It had gone 5 days without rain (1 mm or more) when it started. Rain came after the fire: 1.3 mm on 18 Jul.
This area had burned before
33% of the perimeter overlaps earlier fires recorded since 2016: 102 ha in 2024.
What happened to each town
-
250 ha reached on 9 Jul0.2 %
-
45 ha0.0 %
-
9 ha reached on 9 Jul0.0 %
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
- Agricultural areas71 %
- Other natural land17 %
- Mixed forest11 %
- Broadleaved forest0.7 %
Land cover inside the perimeter as reported by Copernicus EFFIS (outside the Corine Land Cover area).
People and buildings inside the perimeter
GHSL 2025Built-up area< 0.1 ha
Residents< 20
Inside the perimeter there was no noticeable built-up land and almost nobody lived there (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.
Source: Global Human Settlement Layer (GHS-BUILT-S and GHS-POP R2023A), European Commission Joint Research Centre (JRC), © European Union, CC BY 4.0. Sum inside the perimeter computed by WorldFires. human-settlement.emergency.copernicus.eu
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)
Started with Very dry air: 2.5 % of the area in Ukraine
| Day | High | Min. humidity | Peak gust | Rain | Danger (FWI) |
|---|---|---|---|---|---|
| 8 Jul | 36.8 °C | 13 % | 30 km/h | 0.0 mm | High 31 |
| 9 Jul | 36.0 °C | 9 % | 49 km/h | 0.0 mm | Very high 48 |
| 10 Jul | 37.5 °C | 9 % | 43 km/h | 0.0 mm | Very high 45 |
| 11 Jul | 36.8 °C | 19 % | 45 km/h | 0.5 mm | Very high 45 |
| 12 Jul | 37.5 °C | 18 % | 24 km/h | 0.0 mm | High 34 |
| 13 Jul after | 36.4 °C | 22 % | 31 km/h | 0.5 mm | High 38 |
| 14 Jul after | 31.7 °C | 29 % | 37 km/h | 0.1 mm | High 33 |
| 15 Jul after | 32.4 °C | 25 % | 36 km/h | 0.0 mm | High 34 |
| 16 Jul after | 31.9 °C | 26 % | 26 km/h | 0.0 mm | High 30 |
| 17 Jul after | 31.8 °C | 28 % | 30 km/h | 0.2 mm | High 35 |
| 18 Jul after | 34.0 °C | 30 % | 30 km/h | 1.3 mm | High 23 |
Its twins: fires that started in the same weather
It started with an FWI of 30.7, a minimum humidity of 13% and 5 days without rain. Fires in the area that started in weather like this since 2016: 22.
FWI at the start
30.7
Minimum humidity
13 %
Days without rain
5
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Sloviansk fire, 8 July 2025
305 ha
5 days
FWI 30.7
Min. humidity 13 %
Stanytsia-Luhanska fire, April 2020
228 ha
1 day
FWI 29.8
Min. humidity 14 %
95 km away, in 2020
First rain (1 mm or more) after it ended: 5.2 mm on 3 May.
Balakliia fire, May 2022
111 ha
1 day
FWI 32.1
Min. humidity 14 %
98 km away, in 2022
First rain (1 mm or more) after it ended: 1.0 mm on 14 May.
Popasna fire, September 2026
103 ha
1 day
FWI 32.4
Min. humidity 15 %
38 km away, in 2026
First rain (1 mm or more) after it ended: 4.3 mm on 6 Sept.
Popasna fire, September 2026
211 ha
10 days
FWI 32.4
Min. humidity 15 %
42 km away, in 2026
First rain (1 mm or more) after it ended: 4.3 mm on 6 Sept.
Dvorichna fire, May 2025
137 ha
2 days
FWI 34.0
Min. humidity 13 %
135 km away, in 2025
First rain (1 mm or more) after it ended: 1.0 mm on 5 May.
What happened to them
- 2 days
- median duration
- 157 ha
- median area
- 0 %
- went past 1,000 ha
- 4.0 mm
- rain at the end (median; 19 of 22 had it)
It was 1.9 times larger than the median of its twins and lasted 5 days, against 2 days.
Only 3 of its 22 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 3 of 22, 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 4.0 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
1.3 mmfirst rain
18 Jul6 days after it ended
49km/h · max. gust
It was considered over on 12 Jul, and on 18 Jul 1.3 mm fell. We do not know whether the rain or the firefighters put it out. Twins with rain when they ended: 19 of 22, with a median of 4.0 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 · 1 Jul 2025
After · 19 Jul 2025
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 12 July 2025 the air beside the fire reached 28 µg/m³ of PM2.5. That day averaged 21: 1.4 times the WHO daily guideline (15).
PM2.5 peak28 µg/m³
Days over the guideline3 days
PM1073 µg/m³
Optical depth0.46
WHO 15
6 Jul8 Jul10 Jul12 Jul
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 · 7Every 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
Frequently asked questions
- How long did the Sloviansk fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 8 July 2025 to 12 July 2025 (5 days). The perimeter dates it from 8 July 2025 to 10 July 2025.
- How much area did it burn?
- The perimeter Copernicus measured from satellite imagery is 305 hectares (3.0 km²). Official national figures may differ.
- Which municipalities burned?
- The fire entered 3 municipalities: Sloviansk (250 ha, 0.2 %); Bakhmut (45 ha, 0.0 %); Kostiantynivka (9 ha, 0.0 %).
- Did the fire reach a town?
- The fire started in Sloviansk and came within 19.6 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 37.5 °C, humidity dropped to 9 % and gusts hit 49 km/h. The fire danger index (FWI) reached 48, class Very high.
- 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: 22. Their median duration was 2 days and their median area 157 ha; 0 % went past 1,000 ha. Only 3 of its 22 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 3 of 22, 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 4.0 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: 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
How we know this
- Perimeter: EFFIS (Copernicus), mapped on satellite imagery.
- Dates adjusted with the VIIRS detections inside the perimeter, which said 8 July 2025 to 10 July 2025. 7 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.
- 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.
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.