Burned area
satellite only235ha
Perimeter published by EFFIS (Copernicus).
- Source
- EFFIS (Copernicus)
- Date
- perimeter revised on 29 August 2023
+− cross-check
No official record is matched to this page to compare it with.
UA · Ukraine · –
Kalanchak fire, 17 August 2023 Каланчацький район · Kalanchak
Out · last detection 19 Aug 2023, 11:05 UTC
The fire started on 17 August 2023 in Kalanchak, Ukraine, and satellites saw it burning for 4 days. Copernicus mapped a burnt perimeter of 235 hectares from satellite imagery, spread across a single municipality.
It is the 505th largest in Kherson Oblast since 2016 (of 1102 with a page). Number 187 in Ukraine in 2023, of 491.
The power measured by the satellite is low (2.3 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 only4days
17 Aug 2023 to 20 Aug 2023: first and last day with fire on the page.
- Source
- EFFIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 19 Aug 2023, 11:05 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 only17 Aug 2023
First day with fire seen by the satellites or the perimeter.
- Source
- EFFIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 17 Aug 2023
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only3
VIIRS detections at 375 m. Most intense hotspot: 2 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 17 Aug 2023 – 20 Aug 2023
+− 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 only5MW
Total radiative power on 19 August 2023; hotspots that day: 2.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 19 Aug 2023
+− 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
model17.8FWI · moderate
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
- 17 Aug 2023, 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
model35.3°C · 31% RH
High of 35.3 °C and minimum humidity of 31% on 20 August 2023; gusts of 33 km/h on 17 August 2023.
- Source
- weather model at the fire’s grid cell
- Date
- 17 Aug 2023 – 20 Aug 2023
- 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
- 235 ha
- Dates
- 17 Aug 2023 – 20 Aug 2023
- Name
- Kalanchak
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/kalanchak-2023-08-3?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 kalanchak-2023-08-3.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023-08-17 | 0 | 0 | 32.1 | 20.8 | 42 | 16.6 | 32.8 | 0 | 17.8 | moderado | 1 |
| 2023-08-18 | 1 | 1 | 31 | 20.6 | 40 | 15.5 | 30.2 | 0 | 18.1 | moderado | 1 |
| 2023-08-19 | 2 | 5 | 33.3 | 20.8 | 37 | 14.4 | 30.6 | 0 | 19.9 | moderado | 1 |
| 2023-08-20 | 0 | 0 | 35.3 | 20.6 | 31 | 14.2 | 27.4 | 0 | 23.8 | alto | 1 |
| 2023-08-21 | 0 | 0 | 36.1 | 20.1 | 22 | 10.5 | 26.6 | 0 | 27 | alto | 0 |
| 2023-08-22 | 0 | 0 | 33.4 | 20.8 | 40 | 15.4 | 28.4 | 0 | 26.1 | alto | 0 |
| 2023-08-23 | 0 | 0 | 30.5 | 18.4 | 33 | 11.4 | 24.8 | 0 | 24.3 | alto | 0 |
| 2023-08-24 | 0 | 0 | 29.4 | 18 | 38 | 13.5 | 24.1 | 0 | 24.9 | alto | 0 |
| 2023-08-25 | 0 | 0 | 30.1 | 19 | 38 | 8.6 | 23.8 | 0 | 22.4 | alto | 0 |
| 2023-08-26 | 0 | 0 | 30.7 | 18.3 | 32 | 11.3 | 23.8 | 0 | 24.6 | alto | 0 |
| 2023-08-27 | 0 | 0 | 32 | 19.7 | 34 | 10 | 22 | 0 | 24.4 | alto | 0 |
| 2023-08-28 | 0 | 0 | 34.6 | 21.2 | 37 | 10.8 | 24.5 | 0.7 | 22.4 | alto | 0 |
| 2023-08-29 | 0 | 0 | 32.6 | 22.4 | 44 | 19.4 | 35.3 | 0.3 | 28.4 | alto | 0 |
| 2023-08-30 | 0 | 0 | 28.9 | 20.4 | 34 | 28.1 | 51.5 | 0 | 35.9 | 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
- 235ha
- Copernicus perimeter
- Duration
- 4days
- 17 Aug 2023 – 20 Aug 2023
- Municipalities hit
- 1
- districts
- Started on
- 17 Aug
- 2023
- Heat detections
- 3
- in a single hotspot: 2 MW
- Danger at start
- 18
- Moderate · FWI index
- Average daily power
- 3MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
17 Aug20 Aug
19 Aug 2023
How it evolved, day by day
18 Aug
19 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
35°high
33km/h · peak gust
31%lowest humidity
It had gone 5 days without rain (1 mm or more) when it started.
This area had burned before
No earlier perimeters overlap this fire since 2016, when the satellite record begins.
What happened to each town
-
235 ha reached on 18 Aug0.2 %
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 areas90 %
- Other natural land5.8 %
- Mixed forest3.8 %
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)
| Day | High | Min. humidity | Peak gust | Rain | Danger (FWI) |
|---|---|---|---|---|---|
| 17 Aug | 32.1 °C | 42 % | 33 km/h | 0.0 mm | Moderate 18 |
| 18 Aug | 31.0 °C | 40 % | 30 km/h | 0.0 mm | Moderate 18 |
| 19 Aug | 33.3 °C | 37 % | 31 km/h | 0.0 mm | Moderate 20 |
| 20 Aug | 35.3 °C | 31 % | 27 km/h | 0.0 mm | High 24 |
| 21 Aug after | 36.1 °C | 22 % | 27 km/h | 0.0 mm | High 27 |
| 22 Aug after | 33.4 °C | 40 % | 28 km/h | 0.0 mm | High 26 |
| 23 Aug after | 30.5 °C | 33 % | 25 km/h | 0.0 mm | High 24 |
| 24 Aug after | 29.4 °C | 38 % | 24 km/h | 0.0 mm | High 25 |
| 25 Aug after | 30.1 °C | 38 % | 24 km/h | 0.0 mm | High 22 |
| 26 Aug after | 30.7 °C | 32 % | 24 km/h | 0.0 mm | High 25 |
| 27 Aug after | 32.0 °C | 34 % | 22 km/h | 0.0 mm | High 24 |
| 28 Aug after | 34.6 °C | 37 % | 24 km/h | 0.7 mm | High 22 |
| 29 Aug after | 32.6 °C | 44 % | 35 km/h | 0.3 mm | High 28 |
| 30 Aug after | 28.9 °C | 34 % | 52 km/h | 0.0 mm | High 36 |
Its twins: fires that started in the same weather
It started with an FWI of 17.8, a minimum humidity of 42% and 5 days without rain. Fires in the area that started in weather like this since 2022: 56.
FWI at the start
17.8
Minimum humidity
42 %
Days without rain
5
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Kalanchak fire, 17 August 2023
235 ha
4 days
FWI 17.8
Min. humidity 42 %
Oleshky fire, May 2023
341 ha
3 days
FWI 16.3
Min. humidity 41 %
67 km away, in 2023
First rain (1 mm or more) after it ended: 2.1 mm on 22 May.
Holo Prystan fire, August 2022
227 ha
1 day
FWI 17.4
Min. humidity 43 %
87 km away, in 2022
First rain (1 mm or more) after it ended: 4.6 mm on 14 Aug.
Chaplynka fire, September 2025
102 ha
1 day
FWI 14.9
Min. humidity 42 %
46 km away, in 2025
First rain (1 mm or more) after it ended: 1.4 mm on 30 Sept.
Holo Prystan fire, August 2022
225 ha
4 days
FWI 18.1
Min. humidity 40 %
127 km away, in 2022
First rain (1 mm or more) after it ended: 3.8 mm on 3 Sept.
Mykhailivka fire, June 2026
583 ha
11 days
FWI 18.8
Min. humidity 42 %
203 km away, in 2026
First rain (1 mm or more) after it ended: 2.1 mm on 4 Jul.
What happened to them
- 4 days
- median duration
- 182 ha
- median area
- 2 %
- went past 1,000 ha
- 3.5 mm
- rain at the end (median; 47 of 56 had it)
It burned an area similar to its twins (235 ha against a median of 182 ha) and lasted 4 days, against 4 days.
In 9 of 56, 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 3.5 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
—first rain
—no rain in ten days
33km/h · max. gust
It was considered over on 20 Aug, and not even 1 mm fell in the following ten days: it went out without rain. Twins with rain when they ended: 47 of 56, with a median of 3.5 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 2022.
- 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 · 10 Aug 2023
After · 27 Aug 2023
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 21 August 2023 the air beside the fire reached 18 µg/m³ of PM2.5, but no daily average passed the WHO guideline (15).
PM2.5 peak18 µg/m³
Days over the guideline0 days
PM1030 µg/m³
Optical depth0.32
WHO 15
15 Aug17 Aug19 Aug21 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 · 3Every 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 Kalanchak fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 17 August 2023 to 20 August 2023 (4 days). The perimeter dates it from 17 August 2023 to 19 August 2023.
- How much area did it burn?
- The perimeter Copernicus measured from satellite imagery is 235 hectares (2.4 km²). Official national figures may differ.
- Which municipalities burned?
- The fire only entered Kalanchak (235 ha, 0.2 %).
- Did the fire reach a town?
- The fire started in Kalanchak and came within 3.6 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 35.3 °C, humidity dropped to 31 % and gusts hit 33 km/h. The fire danger index (FWI) reached 24, class 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 2022 with a similar FWI, humidity and dry spell: 56. Their median duration was 4 days and their median area 182 ha; 2 % went past 1,000 ha. In 9 of 56, 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 3.5 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 17 August 2023 to 19 August 2023. 3 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.