Burned area
satellite only3,380ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 22 Mar 2025 – 27 Mar 2025
+− cross-check
No official record is matched to this page to compare it with.
LA · Laos · –
Xaybuathong fire, March 2025 Xaybuathong
Out · last detection 27 Mar 2025, 18:35 UTC
The fire started on 22 March 2025 in Xaybuathong, Laos, and satellites saw it burning for 6 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 3,380 hectares from heat detections, spread across a single municipality.
It is the 12th largest in Khammouane since 2016 (of 41 with a page). Number 18 in Laos in 2025, of 54.
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 only6days
22 Mar 2025 to 27 Mar 2025: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 27 Mar 2025, 18:35 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 only22 Mar 2025
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 22 Mar 2025
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only80
VIIRS detections at 375 m. Most intense hotspot: 67 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 22 Mar 2025 – 27 Mar 2025
+− 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 only631MW
Total radiative power on 25 March 2025; hotspots that day: 50.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 25 Mar 2025
+− 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
model20.4FWI · moderate
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 8.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 22 Mar 2025, 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
model37.4°C · 27% RH
High of 37.4 °C and minimum humidity of 27% on 25 March 2025; gusts of 40 km/h on 22 March 2025.
- Source
- weather model at the fire’s grid cell
- Date
- 22 Mar 2025 – 27 Mar 2025
- 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≈ 1,400people
Estimated residents inside the perimeter and 4.4 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 GHSLPopulation and built-up area computed
-
· reconstructed weatherWeather and FWI computed from the ERA5 reanalysis
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
- 3,380 ha
- Dates
- 22 Mar 2025 – 27 Mar 2025
- Name
- Xaybuathong
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/xaybuathong-2025-03?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 xaybuathong-2025-03.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025-03-22 | 2 | 2 | 29.5 | 15.6 | 41 | 14.5 | 40.3 | 0 | 20.4 | moderado | 1 |
| 2025-03-23 | 13 | 386 | 32.5 | 18.2 | 39 | 14.4 | 36 | 0 | 22.5 | alto | 1 |
| 2025-03-24 | 8 | 123 | 34.1 | 17.9 | 36 | 14.1 | 32.8 | 0 | 24.6 | alto | 1 |
| 2025-03-25 | 50 | 631 | 37.4 | 18.6 | 27 | 8.6 | 18.4 | 0 | 26.9 | alto | 1 |
| 2025-03-26 | 6 | 97 | 36.2 | 21.6 | 36 | 10.1 | 29.5 | 0 | 28.1 | alto | 1 |
| 2025-03-27 | 1 | 1 | 34.6 | 24.8 | 45 | 13 | 40 | 0.4 | 25.9 | alto | 1 |
| 2025-03-28 | 0 | 0 | 36.5 | 25.1 | 42 | 9.7 | 27.4 | 0.2 | 24.2 | alto | 0 |
| 2025-03-29 | 0 | 0 | 31.3 | 21.5 | 55 | 22.3 | 52.9 | 0.8 | 21.1 | moderado | 0 |
| 2025-03-30 | 0 | 0 | 23.1 | 17.5 | 64 | 19.7 | 49.3 | 0 | 18.3 | moderado | 0 |
| 2025-03-31 | 0 | 0 | 25 | 16.9 | 54 | 19.1 | 47.2 | 0 | 18.8 | moderado | 0 |
| 2025-04-01 | 0 | 0 | 23.9 | 17 | 53 | 22.3 | 51.5 | 0 | 20.9 | moderado | 0 |
| 2025-04-02 | 0 | 0 | 26.3 | 16.2 | 45 | 18.9 | 50 | 0 | 22.3 | alto | 0 |
| 2025-04-03 | 0 | 0 | 28.4 | 17.6 | 47 | 15.1 | 42.8 | 0 | 20.9 | moderado | 0 |
| 2025-04-04 | 0 | 0 | 35.7 | 17.9 | 35 | 9.7 | 25.6 | 0 | 25 | alto | 0 |
| 2025-04-05 | 0 | 0 | 36.8 | 20.6 | 38 | 18.1 | 44.3 | 0.1 | 31.4 | alto | 0 |
| 2025-04-06 | 0 | 0 | 32.8 | 21.9 | 48 | 14.8 | 35.6 | 1.8 | 14.2 | 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: 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
- 3,380ha
- GWIS perimeter (Copernicus)
- Duration
- 6days
- 22 Mar 2025 – 27 Mar 2025
- Municipalities hit
- 1
- districts
- Started on
- 22 Mar
- 2025
- Heat detections
- 80
- in a single hotspot: 67 MW
- Danger at start
- 20
- Moderate · FWI index
- Average daily power
- 207MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
22 Mar27 Mar
27 Mar 2025
How it evolved, day by day
22 Mar
25 Mar
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
37°high
40km/h · peak gust
27%lowest humidity
It had gone 8 days without rain (1 mm or more) when it started. Rain came after the fire: 1.8 mm on 6 Apr.
This area had burned before
100% of the perimeter overlaps earlier fires recorded since 2016: 1,742 ha in 2016, 554 ha in 2017, 1,526 ha in 2018, 2,316 ha in 2019, 2 ha in 2020, 2,422 ha in 2021, 3,190 ha in 2022, 1,734 ha in 2023, 874 ha in 2024. Part of it burned more than once, so the yearly figures add up to more than the 3,393 ha that had burned before.
- 2,422 ha Xaybuathong fire, March 2021 3,936 ha in total; the hectares shown are those it shares with this fire
- 2,116 ha Xaybuathong fire, February 2019 5,118 ha in total; the hectares shown are those it shares with this fire
- 1,945 ha Xaybuathong fire, February 2022 4,730 ha in total; the hectares shown are those it shares with this fire
How big is it?
London boundary: geoBoundaries · Office for National Statistics (Open Government Licence v3.0).
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).
Berlin boundary: geoBoundaries · Federal Agency for Cartography and Geodesy (dl-de/by-2-0).
This compares size, not location: both shapes are at the same scale, north up, centred on each other.
What happened to each town
-
Xaybuathong where it started3,399 ha reached on 22 Mar3.7 %
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 area4.4 ha
Residents≈ 1,400
Inside the perimeter there were about 4.4 hectares of built-up land and about 1,400 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) |
|---|---|---|---|---|---|
| 22 Mar | 29.5 °C | 41 % | 40 km/h | 0.0 mm | Moderate 20 |
| 23 Mar | 32.5 °C | 39 % | 36 km/h | 0.0 mm | High 22 |
| 24 Mar | 34.1 °C | 36 % | 33 km/h | 0.0 mm | High 25 |
| 25 Mar | 37.4 °C | 27 % | 18 km/h | 0.0 mm | High 27 |
| 26 Mar | 36.2 °C | 36 % | 30 km/h | 0.0 mm | High 28 |
| 27 Mar | 34.6 °C | 45 % | 40 km/h | 0.4 mm | High 26 |
| 28 Mar after | 36.5 °C | 42 % | 27 km/h | 0.2 mm | High 24 |
| 29 Mar after | 31.3 °C | 55 % | 53 km/h | 0.8 mm | Moderate 21 |
| 30 Mar after | 23.1 °C | 64 % | 49 km/h | 0.0 mm | Moderate 18 |
| 31 Mar after | 25.0 °C | 54 % | 47 km/h | 0.0 mm | Moderate 19 |
| 1 Apr after | 23.9 °C | 53 % | 52 km/h | 0.0 mm | Moderate 21 |
| 2 Apr after | 26.3 °C | 45 % | 50 km/h | 0.0 mm | High 22 |
| 3 Apr after | 28.4 °C | 47 % | 43 km/h | 0.0 mm | Moderate 21 |
| 4 Apr after | 35.7 °C | 35 % | 26 km/h | 0.0 mm | High 25 |
| 5 Apr after | 36.8 °C | 38 % | 44 km/h | 0.1 mm | High 31 |
| 6 Apr after | 32.8 °C | 48 % | 36 km/h | 1.8 mm | Moderate 14 |
Its twins: fires that started in the same weather
It started with an FWI of 20.4, a minimum humidity of 41% and 8 days without rain. Fires in the area that started in weather like this since 2016: 23.
FWI at the start
20.4
Minimum humidity
41 %
Days without rain
8
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Xaybuathong fire, March 2025
3,380 ha
6 days
FWI 20.4
Min. humidity 41 %
Vilabuly fire, March 2021
2,122 ha
14 days
FWI 20.1
Min. humidity 41 %
20 km away, in 2021
First rain (1 mm or more) after it ended: 2.0 mm on 1 Apr.
Xaybuathong fire, March 2021
2,957 ha
10 days
FWI 20.5
Min. humidity 39 %
18 km away, in 2021
First rain (1 mm or more) after it ended: 7.3 mm on 21 Mar.
Bualapha fire, March 2021
4,981 ha
17 days
FWI 17.9
Min. humidity 41 %
31 km away, in 2021
First rain (1 mm or more) after it ended: 2.0 mm on 1 Apr.
Vilabuly fire, March 2022
2,156 ha
13 days
FWI 17.4
Min. humidity 40 %
21 km away, in 2022
First rain (1 mm or more) after it ended: 5.1 mm on 17 Mar.
Nong fire, March 2021
3,263 ha
8 days
FWI 20.2
Min. humidity 42 %
119 km away, in 2021
First rain (1 mm or more) after it ended: 11.6 mm on 2 Apr.
What happened to them
- 11 days
- median duration
- 2,269 ha
- median area
- 100 %
- went past 1,000 ha
- 2.0 mm
- rain at the end (median; 21 of 23 had it)
It burned an area similar to its twins (3,380 ha against a median of 2,269 ha) and lasted 6 days, against 11 days.
In 2 of 23, 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 2.0 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
1.8 mmfirst rain
6 Apr10 days after it ended
40km/h · max. gust
It was considered over on 27 Mar, and on 6 Apr 1.8 mm fell. We do not know whether the rain or the firefighters put it out. Twins with rain when they ended: 21 of 23, with a median of 2.0 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 · 15 Mar 2025
After · 3 Apr 2025
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 25 March 2025 the air beside the fire reached 198 µg/m³ of PM2.5. That day averaged 96: 6.4 times the WHO daily guideline (15).
PM2.5 peak198 µg/m³
Days over the guideline10 days
PM10203 µg/m³
Optical depth1.69
WHO 15
20 Mar23 Mar26 Mar29 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 · 80Every 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 Xaybuathong fire last?
- GWIS (Copernicus) dates it between 22 March 2025 and 27 March 2025: 6 days 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 3,380 hectares (33.8 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Xaybuathong (3,399 ha, 3.7 %).
- What was the weather like?
- During the fire the temperature reached 37.4 °C, humidity dropped to 27 % and gusts hit 40 km/h. The fire danger index (FWI) reached 28, class High.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Laos (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: 23. Their median duration was 11 days and their median area 2,269 ha; 100 % went past 1,000 ha. In 2 of 23, 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 2.0 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.
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. 80 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 3.0 Intergovernmental Organisations (CC BY 3.0 IGO)). 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.