Burned area
satellite only332ha
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.
UA · Ukraine · –
Korosten fire, 16 April 2020 Коростенський район · Korosten
Out · last detection 18 Apr 2020, 11:43 UTC
The fire started on 16 April 2020 in Korosten, Ukraine, and satellites saw it burning for 3 days. Copernicus mapped a burnt perimeter of 332 hectares from satellite imagery, spread across a single municipality.
It is the 68th largest in Zhytomyr Oblast since 2016 (of 179 with a page). Number 73 in Ukraine in 2020, of 132.
The power measured by the satellite is low (15.6 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 only3days
16 Apr 2020 to 18 Apr 2020: first and last day with fire on the page.
- Source
- EFFIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 18 Apr 2020, 11:43 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 only16 Apr 2020
First day with fire seen by the satellites or the perimeter.
- Source
- EFFIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 16 Apr 2020
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only48
VIIRS detections at 375 m. Most intense hotspot: 16 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 16 Apr 2020 – 18 Apr 2020
+− 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 only115MW
Total radiative power on 17 April 2020; hotspots that day: 28.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 17 Apr 2020
+− 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
model67.5FWI · extreme
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 1.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 16 Apr 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
model19.6°C · 19% RH
High of 19.6 °C and minimum humidity of 19% on 16 April 2020; gusts of 77 km/h on 16 April 2020.
- Source
- weather model at the fire’s grid cell
- Date
- 16 Apr 2020 – 18 Apr 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
- 332 ha
- Dates
- 16 Apr 2020 – 18 Apr 2020
- Name
- Korosten
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/korosten-2020-04-4?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 korosten-2020-04-4.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2020-04-16 | 10 | 23 | 19.6 | 5.9 | 19 | 43 | 77.4 | 0 | 67.5 | extremo | 1 |
| 2020-04-17 | 28 | 115 | 13.3 | 3.6 | 18 | 28.7 | 50 | 0 | 37.4 | alto | 1 |
| 2020-04-18 | 10 | 17 | 11.3 | -0.2 | 22 | 22.2 | 43.9 | 0 | 36.4 | alto | 1 |
| 2020-04-19 | 0 | 0 | 13.1 | 0.5 | 19 | 24.2 | 47.9 | 0 | 35.9 | alto | 0 |
| 2020-04-20 | 0 | 0 | 9.6 | -1.2 | 31 | 23.8 | 46.4 | 0 | 36.3 | alto | 0 |
| 2020-04-21 | 0 | 0 | 10.9 | 0.7 | 28 | 21.4 | 40 | 0 | 29.2 | alto | 0 |
| 2020-04-22 | 0 | 0 | 16.7 | 4.5 | 21 | 23.9 | 45 | 0.4 | 36.4 | alto | 0 |
| 2020-04-23 | 0 | 0 | 19.2 | 0.9 | 17 | 20.3 | 36.7 | 0 | 34.8 | alto | 0 |
| 2020-04-24 | 0 | 0 | 19.9 | 4.8 | 14 | 24.9 | 48.2 | 0 | 48.9 | muy_alto | 0 |
| 2020-04-25 | 0 | 0 | 19.6 | 7.2 | 28 | 16.9 | 41.4 | 1.8 | 20.7 | moderado | 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
- Burnt area
- 332ha
- Copernicus perimeter
- Duration
- 3days
- 16 Apr 2020 – 18 Apr 2020
- Municipalities hit
- 1
- districts
- Started on
- 16 Apr
- 2020
- Heat detections
- 48
- in a single hotspot: 16 MW
- Danger at start
- 68
- Extreme · FWI index
- Average daily power
- 52MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
16 Apr18 Apr
18 Apr 2020
How it evolved, day by day
16 Apr
17 Apr
18 Apr
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
20°high
77km/h · peak gust
18%lowest humidity
It had gone one day without rain (1 mm or more) when it started. Rain came after the fire: 1.8 mm on 25 Apr.
This area had burned before
No earlier perimeters overlap this fire since 2016, when the satellite record begins.
What happened to each town
-
332 ha reached on 16 Apr0.3 %
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
- Coniferous forest92 %
- Mixed forest7.9 %
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)
Started with Extreme FWI: 29 % of the area in Ukraine Strong wind: 20 % of the area in Ukraine
| Day | High | Min. humidity | Peak gust | Rain | Danger (FWI) |
|---|---|---|---|---|---|
| 16 Apr | 19.6 °C | 19 % | 77 km/h | 0.0 mm | Extreme 68 |
| 17 Apr | 13.3 °C | 18 % | 50 km/h | 0.0 mm | High 37 |
| 18 Apr | 11.3 °C | 22 % | 44 km/h | 0.0 mm | High 36 |
| 19 Apr after | 13.1 °C | 19 % | 48 km/h | 0.0 mm | High 36 |
| 20 Apr after | 9.6 °C | 31 % | 46 km/h | 0.0 mm | High 36 |
| 21 Apr after | 10.9 °C | 28 % | 40 km/h | 0.0 mm | High 29 |
| 22 Apr after | 16.7 °C | 21 % | 45 km/h | 0.4 mm | High 36 |
| 23 Apr after | 19.2 °C | 17 % | 37 km/h | 0.0 mm | High 35 |
| 24 Apr after | 19.9 °C | 14 % | 48 km/h | 0.0 mm | Very high 49 |
| 25 Apr after | 19.6 °C | 28 % | 41 km/h | 1.8 mm | Moderate 21 |
Its twins: fires that started in the same weather
It started with an FWI of 67.5, a minimum humidity of 19% and 1 day without rain. Fires in the area that started in weather like this since 2020: 8.
FWI at the start
67.5
Minimum humidity
19 %
Days without rain
1
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Korosten fire, 16 April 2020
332 ha
3 days
FWI 67.5
Min. humidity 19 %
Zghurivka fire, September 2024
104 ha
4 days
FWI 68.4
Min. humidity 21 %
216 km away, in 2024
First rain (1 mm or more) after it ended: none in the following ten days.
Ivankiv fire, September 2024
196 ha
3 days
FWI 67.0
Min. humidity 24 %
90 km away, in 2024
First rain (1 mm or more) after it ended: 1.5 mm on 26 Sept.
Vyshhorod fire, September 2024
340 ha
10 days
FWI 69.7
Min. humidity 24 %
124 km away, in 2024
First rain (1 mm or more) after it ended: 3.8 mm on 4 Oct.
Zarichne fire, September 2024
213 ha
2 days
FWI 64.9
Min. humidity 20 %
186 km away, in 2024
First rain (1 mm or more) after it ended: 13.4 mm on 12 Sept.
Rokytne fire, September 2024
176 ha
2 days
FWI 58.5
Min. humidity 22 %
113 km away, in 2024
First rain (1 mm or more) after it ended: 15.3 mm on 12 Sept.
What happened to them
Fires in the area that started in similar weather: 8. With fewer than 15 we give no figures: they would be more noise than signal.
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
1.8 mmfirst rain
25 Apr7 days after it ended
77km/h · max. gust
It was considered over on 18 Apr, and on 25 Apr 1.8 mm fell. We do not know whether the rain or the firefighters put it out.
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 2020.
- 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 · 9 Apr 2020
After · 25 Apr 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 17 April 2020 the air beside the fire reached 15 µg/m³ of PM2.5, but no daily average passed the WHO guideline (15).
PM2.5 peak15 µg/m³
Days over the guideline0 days
PM1020 µg/m³
14 Apr16 Apr18 Apr20 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)
Detections table · 48Every 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
- 2,159 haLuhyny Лугинський район25 March 2020 · 7 days · 24 km away
- 1,660 haNarodychi Народицький район16 March 2022 · 8 days · 25 km away
- 1,204 haNarodychi Народицький район22 March 2022 · 8 days · 27 km away
- 1,072 haKorosten Коростенський район16 April 2020 · 8 days · 31 km away
- 27,244 haOvruch Овруцький район16 April 2020 · 8 days · 35 km away
- 1,617 haYemilchyne Ємільчинський район6 March 2025 · 3 days · 36 km away
Frequently asked questions
- How long did the Korosten fire last?
- Copernicus dates it between 16 April 2020 and 18 April 2020: 3 days between the first and last image with fire.
- How much area did it burn?
- The perimeter Copernicus measured from satellite imagery is 332 hectares (3.3 km²). Official national figures may differ.
- Which municipalities burned?
- The fire only entered Korosten (332 ha, 0.3 %).
- Did the fire reach a town?
- The fire started in Korosten and came within 27.6 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 19.6 °C, humidity dropped to 18 % and gusts hit 77 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.
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 from the perimeter: the VIIRS detections inside it did not change them. 48 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. 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.