Burned area
satellite only225ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 3 Mar 2024 – 3 Mar 2024
+− cross-check
No official record is matched to this page to compare it with.
JP · Japan ·
Sakura fire, March 2024 佐倉市 · Sakura, Inzai
Out · last detection 3 Mar 2024, 04:21 UTC
The fire started on 3 March 2024 in Sakura, Japan, and satellites saw it burning for 1 day. Copernicus’s global GWIS system rebuilt a burnt perimeter of 225 hectares from heat detections, spread across 2 municipalities.
Number 10 in Japan in 2024, of 14.
The power measured by the satellite is low (8.0 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.
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Suggestions: Gotenba · 2023????? · 2025
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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 only1day
3 Mar 2024 to 3 Mar 2024: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 3 Mar 2024, 04:21 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 only3 Mar 2024
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 3 Mar 2024
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only9
VIIRS detections at 375 m. Most intense hotspot: 8 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 3 Mar 2024 – 3 Mar 2024
+− 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 only43MW
Total radiative power on 3 March 2024; hotspots that day: 9.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 3 Mar 2024
+− 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
model1.9FWI · very low
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
- 3 Mar 2024, 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
model12.1°C · 35% RH
High of 12.1 °C and minimum humidity of 35% on 3 March 2024; gusts of 36 km/h on 3 March 2024.
- Source
- weather model at the fire’s grid cell
- Date
- 3 Mar 2024 – 3 Mar 2024
- 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.
Living inside
model≈ 60people
Estimated residents inside the perimeter and 1.8 ha of built-up area (100 m grid, epoch 2025).
- Source
- GHSL R2023A · JRC
- Date
- calculated on 24 October 2026
+− cross-check
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.
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
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
- 225 ha
- Dates
- 3 Mar 2024 – 3 Mar 2024
- Name
- Sakura
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/sakura-chiba-2024-03?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 sakura-chiba-2024-03.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2024-03-03 | 9 | 43 | 12.1 | 1.5 | 35 | 17.3 | 35.6 | 0 | 1.9 | muy_bajo | 1 |
| 2024-03-04 | 0 | 0 | 13.2 | 3.9 | 40 | 13.3 | 27 | 0 | 2 | muy_bajo | 0 |
| 2024-03-05 | 0 | 0 | 8.4 | 4.6 | 57 | 22.1 | 30.6 | 13.6 | 1.7 | muy_bajo | 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: GWIS (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
- 225ha
- GWIS perimeter (Copernicus)
- Duration
- 1day
- 3 Mar 2024 – 3 Mar 2024
- Municipalities hit
- 2
- municipalities
- Started on
- 3 Mar
- 2024
- Heat detections
- 9
- in a single hotspot: 8 MW
- Danger at start
- 2
- Very low · FWI index
- Average daily power
- 43MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
3 Mar3 Mar
How it evolved, day by day
3 Mar 2024 · 43 MW · 9
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
12°high
36km/h · peak gust
35%lowest humidity
It had gone one day without rain (1 mm or more) when it started. Rain came after the fire: 13.6 mm on 5 Mar.
This area had burned before
No earlier perimeters overlap this fire since 2016, when the satellite record begins.
What happened to each town
-
133 ha reached on 3 Mar1.3 %
-
Inzai 印西市93 ha reached on 3 Mar0.8 %
Burnt area inside each municipality, from crossing the GWIS 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.
People and buildings inside the perimeter
GHSL 2025Built-up area1.8 ha
Residents≈ 60
Inside the perimeter there were about 1.8 hectares of built-up land and about 60 residents (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) |
|---|---|---|---|---|---|
| 3 Mar | 12.1 °C | 35 % | 36 km/h | 0.0 mm | Very low 2 |
| 4 Mar after | 13.2 °C | 40 % | 27 km/h | 0.0 mm | Very low 2 |
| 5 Mar after | 8.4 °C | 57 % | 31 km/h | 13.6 mm | Very low 2 |
Its twins: fires that started in the same weather
It started with an FWI of 1.9, a minimum humidity of 35% and 1 day without rain. Fires in the area that started in weather like this since 2016: 21.
FWI at the start
1.9
Minimum humidity
35 %
Days without rain
1
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Sakura fire, March 2024
225 ha
1 day
FWI 1.9
Min. humidity 35 %
Gotenba fire, February 2023
347 ha
4 days
FWI 0.6
Min. humidity 35 %
137 km away, in 2023
First rain (1 mm or more) after it ended: 7.9 mm on 8 Feb.
????? fire, January 2025
244 ha
1 day
FWI 2.1
Min. humidity 34 %
133 km away, in 2025
First rain (1 mm or more) after it ended: 1.4 mm on 1 Feb.
Gotenba fire, February 2017
317 ha
1 day
FWI 0.0
Min. humidity 36 %
134 km away, in 2017
First rain (1 mm or more) after it ended: 11.0 mm on 20 Feb.
Tochigi fire, March 2018
249 ha
1 day
FWI 0.3
Min. humidity 38 %
75 km away, in 2018
First rain (1 mm or more) after it ended: 1.1 mm on 19 Mar.
Iide fire, September 2019
441 ha
1 day
FWI 2.3
Min. humidity 37 %
238 km away, in 2019
First rain (1 mm or more) after it ended: 1.4 mm on 28 Sept.
What happened to them
- 1 day
- median duration
- 413 ha
- median area
- 0 %
- went past 1,000 ha
- 3.9 mm
- rain at the end (median; 21 of 21 had it)
It stayed below its twins: 225 ha against a median of 413 ha. It lasted 1 day, against 1 day.
All of them had rain in the ten days after the end: the first rainy day brought a median of 3.9 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
13.6 mmfirst rain
5 Mar2 days after it ended
36km/h · max. gust
It was considered over on 3 Mar, and on 5 Mar 13.6 mm fell. We do not know whether the rain or the firefighters put it out. Twins with rain when they ended: 21 of 21, with a median of 3.9 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 · 25 Feb 2024
After · 10 Mar 2024
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 4 March 2024 the air beside the fire reached 26 µg/m³ of PM2.5, but no daily average passed the WHO guideline (15).
PM2.5 peak26 µg/m³
Days over the guideline0 days
PM1046 µg/m³
Optical depth0.53
WHO 15
1 Mar3 Mar5 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 · 9Every 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 |
|---|
Frequently asked questions
- How long did the Sakura fire last?
- GWIS (Copernicus) dates it between 3 March 2024 and 3 March 2024: 1 day between the first and last heat detection of the perimeter.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 225 hectares (2.2 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 2 municipalities: Sakura (133 ha, 1.3 %); Inzai (93 ha, 0.8 %).
- What was the weather like?
- During the fire the temperature reached 12.1 °C, humidity dropped to 35 % and gusts hit 36 km/h. The fire danger index (FWI) reached 2, class Very low.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Japan (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: 21. Their median duration was 1 day and their median area 413 ha; 0 % went past 1,000 ha. All of them had rain in the ten days after the end: the first rainy day brought a median of 3.9 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: 119 · 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: GWIS (Copernicus), rebuilt from heat detections rather than mapped on imagery.
- Dates from the perimeter: the VIIRS detections inside it did not change them. 9 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 comes from the Copernicus Global Wildfire Information System (GWIS), which rebuilds it from MODIS and VIIRS heat detections and publishes it under CC BY 4.0. It is not measured on imagery as in Europe, so it is an estimate. 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 from each country’s official figure.