Grad Knin fire, April 2017 Grad Knin, Općina Gračac
The fire started on 1 April 2017 in Grad Knin, Croatia, and satellites saw it burning for 4 days. Copernicus mapped a burnt perimeter of 1,730 hectares from satellite imagery, spread across 2 municipalities.
It is the 7th largest in Šibenik-Knin since 2016 (of 56 with a page). Number 10 in Croatia in 2017, of 78.
Compare with…
- Burnt area
- 1,730ha
- Copernicus perimeter
- Duration
- 4days
- 1 Apr 2017 – 4 Apr 2017
- Municipalities hit
- 2
- municipalities
- Started on
- 1 Apr
- 2017
- Heat detections
- 70
- in a single hotspot: 40 MW
- Danger at start
- 12
- Moderate · FWI index
- Average daily power
- 142MW
- detected power per day, on average
Where it burned
How it evolved, day by day
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
It had gone 5 days without rain (1 mm or more) when it started. Rain came after the fire: 2.2 mm on 5 Apr.
This area had burned before
No earlier perimeters overlap this fire since 2016, when the satellite record begins.
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 Knin where it started1,354 ha reached on 1 Apr3.7 %
-
378 ha reached on 2 Apr0.4 %
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 land62 %
- Broadleaved forest33 %
- Scrub and transitional woodland3.6 %
- Mixed forest1.6 %
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) |
|---|---|---|---|---|---|
| 1 Apr | 17.1 °C | 38 % | 44 km/h | 0.0 mm | Moderate 12 |
| 2 Apr | 17.5 °C | 35 % | 49 km/h | 0.0 mm | Moderate 13 |
| 3 Apr | 17.3 °C | 34 % | 48 km/h | 0.9 mm | Low 7 |
| 4 Apr | 15.8 °C | 42 % | 47 km/h | 1.2 mm | Very low 5 |
| 5 Apr after | 11.6 °C | 63 % | 43 km/h | 2.2 mm | Very low 2 |
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
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 4 April 2017 the air beside the fire reached 19 µg/m³ of PM2.5. That day averaged 16: 1.1 times the WHO daily guideline (15).
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 · 70Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
- 4,225 haOpćina Gračac21 March 2022 · 7 days · 3 km away
- 4,086 haOpćina Gračac5 August 2017 · 7 days · 5 km away
- 4,959 haOpćina Gračac5 April 2020 · 9 days · 16 km away
- 8,657 haBosansko GrahovoAugust 2026 · 2 days · 26 km away
- 8,212 haBosansko Grahovo6 April 2020 · 6 days · 32 km away
- 5,948 haDinara Općina CivljaneApril 2020 · 7 days · 36 km away
Frequently asked questions
- How long did the Grad Knin fire last?
- Copernicus dates it between 1 April 2017 and 4 April 2017: 4 days between the first and last image with fire.
- How much area did it burn?
- The perimeter Copernicus measured from satellite imagery is 1,730 hectares (17.3 km²). Official national figures may differ.
- Which municipalities burned?
- The fire entered 2 municipalities: Grad Knin (1,354 ha, 3.7 %); Općina Gračac (378 ha, 0.4 %).
- What was the weather like?
- During the fire the temperature reached 17.5 °C, humidity dropped to 34 % and gusts hit 49 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.
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.
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. 70 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.