Burned area
satellite only623ha
Perimeter published by EFFIS (Copernicus).
- Source
- EFFIS (Copernicus)
- Date
- perimeter revised on 24 October 2022
+− cross-check
No official record is matched to this page to compare it with.
HR · Croatia · –
Grad Slunj fire, 24 March 2022 Grad Slunj, Općina Barilović
Out · last detection 25 Mar 2022, 12:45 UTC
The fire started on 24 March 2022 in Grad Slunj, Croatia, and satellites saw it burning for 2 days. Copernicus mapped a burnt perimeter of 623 hectares from satellite imagery, spread across 2 municipalities.
It is the 3th largest in Karlovac since 2016 (of 19 with a page). Number 7 in Croatia in 2022, of 59.
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 only2days
24 Mar 2022 to 25 Mar 2022: first and last day with fire on the page.
- Source
- EFFIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 25 Mar 2022, 12:45 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 only24 Mar 2022
First day with fire seen by the satellites or the perimeter.
- Source
- EFFIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 24 Mar 2022
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only17
VIIRS detections at 375 m. Most intense hotspot: 38 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 24 Mar 2022 – 25 Mar 2022
+− 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 only248MW
Total radiative power on 25 March 2022; hotspots that day: 17.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 25 Mar 2022
+− 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
model12.4FWI · moderate
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 17.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 24 Mar 2022, 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
model22.4°C · 14% RH
High of 22.4 °C and minimum humidity of 14% on 24 March 2022; gusts of 23 km/h on 25 March 2022.
- Source
- weather model at the fire’s grid cell
- Date
- 24 Mar 2022 – 25 Mar 2022
- 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
- 623 ha
- Dates
- 24 Mar 2022 – 25 Mar 2022
- Name
- Grad Slunj
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/grad-slunj-2022-03-2?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 grad-slunj-2022-03-2.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2022-03-24 | 0 | 0 | 22.4 | -1.2 | 14 | 4.9 | 16.2 | 0 | 12.4 | moderado | 1 |
| 2022-03-25 | 17 | 248 | 19.8 | 0.5 | 24 | 9.7 | 23 | 0 | 13.2 | moderado | 1 |
| 2022-03-26 | 0 | 0 | 20.6 | 2.8 | 24 | 5.1 | 19.1 | 0 | 13.4 | moderado | 0 |
| 2022-03-27 | 0 | 0 | 20.4 | 0.5 | 26 | 7.7 | 21.2 | 0 | 14.6 | moderado | 0 |
| 2022-03-28 | 0 | 0 | 22.3 | 3.1 | 23 | 11.9 | 25.2 | 0 | 14.5 | moderado | 0 |
| 2022-03-29 | 0 | 0 | 19.5 | 5.4 | 29 | 15.2 | 43.9 | 0 | 22 | alto | 0 |
| 2022-03-30 | 0 | 0 | 15 | 8.8 | 54 | 16 | 36.4 | 1.2 | 14.8 | 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
- 623ha
- Copernicus perimeter
- Duration
- 2days
- 24 Mar 2022 – 25 Mar 2022
- Municipalities hit
- 2
- municipalities
- Started on
- 24 Mar
- 2022
- Heat detections
- 17
- in a single hotspot: 38 MW
- Danger at start
- 12
- Moderate · FWI index
- Average daily power
- 248MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
24 Mar25 Mar
How it evolved, day by day
25 Mar 2022 · 248 MW · 17
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
22°high
23km/h · peak gust
14%lowest humidity
It had gone 17 days without rain (1 mm or more) when it started. Rain came after the fire: 1.2 mm on 30 Mar.
This area had burned before
34% of the perimeter overlaps earlier fires recorded since 2016: 119 ha in 2019, 158 ha in 2021. Part of it burned more than once, so the yearly figures add up to more than the 212 ha that had burned before.
How big is it?
London boundary: geoBoundaries · Office for National Statistics (Open Government Licence v3.0).
Zagreb boundary: geoBoundaries · OpenStreetMap, Wambacher · © OpenStreetMap contributors (ODbL 1.0).
Paris boundary: geoBoundaries · Institut national de l'information géographique et forestière (IGN-F) (Etalab Open License 2.0).
Madrid boundary: geoBoundaries · Open Data ESRI, IGN Central Registry of Cartography Area (CC BY 4.0).
This compares size, not location: both shapes are at the same scale, north up, centred on each other.
What happened to each town
-
Grad Slunj where it started408 ha reached on 25 Mar1.0 %
-
215 ha reached on 25 Mar1.2 %
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
- Scrub and transitional woodland66 %
- Agricultural areas33 %
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) |
|---|---|---|---|---|---|
| 24 Mar | 22.4 °C | 14 % | 16 km/h | 0.0 mm | Moderate 12 |
| 25 Mar | 19.8 °C | 24 % | 23 km/h | 0.0 mm | Moderate 13 |
| 26 Mar after | 20.6 °C | 24 % | 19 km/h | 0.0 mm | Moderate 13 |
| 27 Mar after | 20.4 °C | 26 % | 21 km/h | 0.0 mm | Moderate 15 |
| 28 Mar after | 22.3 °C | 23 % | 25 km/h | 0.0 mm | Moderate 14 |
| 29 Mar after | 19.5 °C | 29 % | 44 km/h | 0.0 mm | High 22 |
| 30 Mar after | 15.0 °C | 54 % | 36 km/h | 1.2 mm | Moderate 15 |
Its twins: fires that started in the same weather
It started with an FWI of 12.4, a minimum humidity of 14% and 17 days without rain. Fires in the area that started in weather like this since 2016: 28.
FWI at the start
12.4
Minimum humidity
14 %
Days without rain
17
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Grad Slunj fire, 24 March 2022
623 ha
2 days
FWI 12.4
Min. humidity 14 %
Banja Luka fire, April 2020
111 ha
7 days
FWI 12.4
Min. humidity 16 %
129 km away, in 2020
First rain (1 mm or more) after it ended: 16.6 mm on 14 Apr.
Donji Vakuf fire, October 2019
600 ha
4 days
FWI 16.0
Min. humidity 14 %
190 km away, in 2019
First rain (1 mm or more) after it ended: 7.7 mm on 30 Oct.
Bosansko Grahovo fire, April 2020
825 ha
4 days
FWI 12.0
Min. humidity 16 %
132 km away, in 2020
First rain (1 mm or more) after it ended: 17.1 mm on 14 Apr.
Ključ fire, April 2020
119 ha
2 days
FWI 11.1
Min. humidity 16 %
116 km away, in 2020
First rain (1 mm or more) after it ended: 16.5 mm on 14 Apr.
Konjic fire, April 2020
660 ha
5 days
FWI 13.2
Min. humidity 13 %
248 km away, in 2020
First rain (1 mm or more) after it ended: 14.8 mm on 14 Apr.
What happened to them
- 4 days
- median duration
- 322 ha
- median area
- 18 %
- went past 1,000 ha
- 14.8 mm
- rain at the end (median; 27 of 28 had it)
It was 1.9 times larger than the median of its twins and lasted 2 days, against 4 days.
Only 8 of its 28 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 1 of 28, 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 14.8 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
1.2 mmfirst rain
30 Mar5 days after it ended
23km/h · max. gust
It was considered over on 25 Mar, and on 30 Mar 1.2 mm fell. We do not know whether the rain or the firefighters put it out. Twins with rain when they ended: 27 of 28, with a median of 14.8 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 · 17 Mar 2022
After · 1 Apr 2022
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 26 March 2022 the air beside the fire reached 38 µg/m³ of PM2.5. That day averaged 30: 2.0 times the WHO daily guideline (15).
PM2.5 peak38 µg/m³
Days over the guideline6 days
PM1052 µg/m³
WHO 15
22 Mar24 Mar26 Mar28 Mar
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 · 17Every 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
- 636 haGrad Slunj4 March 2021 · 2 days · 2 km away
- 533 haGrad SlunjFebruary 2020 · 4 days · 8 km away
- 637 haOpćina BarilovićMarch 2022 · 1 day · 12 km away
- 359 haOpćina BarilovićMarch 2017 · 3 days · 12 km away
- 421 haOpćina KrnjakApril 2020 · 4 days · 13 km away
- 329 haBihać4 March 2021 · 1 day · 39 km away
Frequently asked questions
- How long did the Grad Slunj fire last?
- Copernicus dates it between 24 March 2022 and 25 March 2022: 2 days between the first and last image with fire.
- How much area did it burn?
- The perimeter Copernicus measured from satellite imagery is 623 hectares (6.2 km²). Official national figures may differ.
- Which municipalities burned?
- The fire entered 2 municipalities: Grad Slunj (408 ha, 1.0 %); Općina Barilović (215 ha, 1.2 %).
- What was the weather like?
- During the fire the temperature reached 22.4 °C, humidity dropped to 14 % and gusts hit 23 km/h. The fire danger index (FWI) reached 13, class Moderate.
- Where does this data come from?
- From the EFFIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Croatia (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: 28. Their median duration was 4 days and their median area 322 ha; 18 % went past 1,000 ha. Only 8 of its 28 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 1 of 28, 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 14.8 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: 112 · 193 · 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. 17 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 (Creative Commons Attribution-ShareAlike 2.0). 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.