Burned area
satellite only2,075ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 23 Feb 2022 – 9 Mar 2022
+− cross-check
No official record is matched to this page to compare it with.
LA · Laos · –
Sanamxay fire, 23 February 2022 Sanamxay
Out · last detection 10 Mar 2022, 18:05 UTC
The fire started on 23 February 2022 in Sanamxay, Laos, and satellites saw it burning for 15 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 2,075 hectares from heat detections, spread across a single municipality.
It is the 26th largest in Attapeu since 2016 (of 28 with a page). Number 73 in Laos in 2022, of 77.
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 only15days
23 Feb 2022 to 9 Mar 2022: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 10 Mar 2022, 18:05 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 only23 Feb 2022
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 23 Feb 2022
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only105
VIIRS detections at 375 m. Most intense hotspot: 63 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 23 Feb 2022 – 9 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 only827MW
Total radiative power on 1 March 2022; hotspots that day: 30.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 1 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
model18.0FWI · moderate
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
- 23 Feb 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
model35.9°C · 33% RH
High of 35.9 °C and minimum humidity of 33% on 4 March 2022; gusts of 35 km/h on 8 March 2022.
- Source
- weather model at the fire’s grid cell
- Date
- 23 Feb 2022 – 9 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.
Living inside
model≈ 200people
Estimated residents inside the perimeter and 0.61 ha of built-up area (100 m grid, epoch 2020).
- 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
- 2,075 ha
- Dates
- 23 Feb 2022 – 9 Mar 2022
- Name
- Sanamxay
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/sanamxay-2022-02-2?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 sanamxay-2022-02-2.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2022-02-23 | 2 | 8 | 32.5 | 19 | 33 | 7.7 | 19.1 | 0 | 18 | moderado | 1 |
| 2022-02-24 | 1 | 7 | 32.3 | 17.3 | 33 | 9.4 | 20.5 | 0 | 20.8 | moderado | 1 |
| 2022-02-25 | 3 | 23 | 32.8 | 16.8 | 31 | 9.3 | 18.7 | 0 | 22.3 | alto | 1 |
| 2022-02-26 | 3 | 9 | 34.1 | 18 | 29 | 8.8 | 16.9 | 0 | 23.8 | alto | 1 |
| 2022-02-27 | 0 | 0 | 33.2 | 18.9 | 36 | 8 | 19.4 | 0 | 23.9 | alto | 1 |
| 2022-02-28 | 8 | 54 | 35.2 | 20.7 | 31 | 10.1 | 22.7 | 0 | 25.8 | alto | 1 |
| 2022-03-01 | 30 | 827 | 34.5 | 22.5 | 38 | 8.8 | 20.2 | 0 | 25.3 | alto | 1 |
| 2022-03-02 | 13 | 150 | 34.9 | 22 | 35 | 8.4 | 17.3 | 0 | 25.5 | alto | 1 |
| 2022-03-03 | 0 | 0 | 34 | 22.2 | 41 | 9.1 | 26.6 | 0.1 | 24.9 | alto | 1 |
| 2022-03-04 | 3 | 18 | 35.9 | 23.6 | 33 | 9.4 | 21.6 | 0 | 25.6 | alto | 1 |
| 2022-03-05 | 6 | 29 | 35.7 | 23.7 | 38 | 7.2 | 21.6 | 0 | 24.7 | alto | 1 |
| 2022-03-06 | 3 | 16 | 35.7 | 23.5 | 38 | 9.5 | 18.4 | 0 | 26.6 | alto | 1 |
| 2022-03-07 | 8 | 155 | 35.4 | 24.6 | 38 | 10.5 | 22.3 | 0.1 | 27.7 | alto | 1 |
| 2022-03-08 | 10 | 216 | 34.2 | 22.2 | 36 | 12.9 | 34.6 | 0 | 29.9 | alto | 1 |
| 2022-03-09 | 11 | 82 | 33.9 | 21.9 | 38 | 8.3 | 25.6 | 0 | 27 | alto | 1 |
| 2022-03-10 | 4 | 10 | 34.8 | 21.4 | 38 | 8.1 | 23.4 | 0 | 27.2 | alto | 0 |
| 2022-03-11 | 0 | 0 | 35.6 | 22.4 | 35 | 11.6 | 35.3 | 0 | 30.1 | alto | 0 |
| 2022-03-12 | 0 | 0 | 36.3 | 21.7 | 33 | 8.5 | 25.6 | 0 | 28.3 | alto | 0 |
| 2022-03-13 | 0 | 0 | 37.3 | 24.6 | 31 | 9.7 | 24.1 | 0 | 30 | alto | 0 |
| 2022-03-14 | 0 | 0 | 36.2 | 25 | 38 | 9.4 | 21.2 | 0 | 30.1 | alto | 0 |
| 2022-03-15 | 0 | 0 | 34.4 | 25.5 | 48 | 5.8 | 22 | 0.2 | 23.3 | alto | 0 |
| 2022-03-16 | 0 | 0 | 31 | 24.5 | 58 | 7.8 | 22.3 | 1 | 12.8 | 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: 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
- 2,075ha
- GWIS perimeter (Copernicus)
- Duration
- 15days
- 23 Feb 2022 – 9 Mar 2022
- Municipalities hit
- 1
- districts
- Started on
- 23 Feb
- 2022
- Heat detections
- 105
- in a single hotspot: 63 MW
- Danger at start
- 18
- Moderate · FWI index
- Average daily power
- 114MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
23 Feb9 Mar
10 Mar 2022
How it evolved, day by day
23 Feb
1 Mar
6 Mar
9 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
36°high
35km/h · peak gust
29%lowest humidity
It had gone one day without rain (1 mm or more) when it started. Rain came after the fire: 1.0 mm on 16 Mar.
This area had burned before
1% of the perimeter overlaps earlier fires recorded since 2016: 29 ha in 2020.
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
-
Sanamxay where it started2,089 ha reached on 23 Feb0.9 %
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 2020Built-up area0.61 ha
Residents≈ 200
Inside the perimeter there were about 0.61 hectares of built-up land and about 200 residents (GHSL 2020, 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.
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) |
|---|---|---|---|---|---|
| 23 Feb | 32.5 °C | 33 % | 19 km/h | 0.0 mm | Moderate 18 |
| 24 Feb | 32.3 °C | 33 % | 20 km/h | 0.0 mm | Moderate 21 |
| 25 Feb | 32.8 °C | 31 % | 19 km/h | 0.0 mm | High 22 |
| 26 Feb | 34.1 °C | 29 % | 17 km/h | 0.0 mm | High 24 |
| 27 Feb | 33.2 °C | 36 % | 19 km/h | 0.0 mm | High 24 |
| 28 Feb | 35.2 °C | 31 % | 23 km/h | 0.0 mm | High 26 |
| 1 Mar | 34.5 °C | 38 % | 20 km/h | 0.0 mm | High 25 |
| 2 Mar | 34.9 °C | 35 % | 17 km/h | 0.0 mm | High 26 |
| 3 Mar | 34.0 °C | 41 % | 27 km/h | 0.1 mm | High 25 |
| 4 Mar | 35.9 °C | 33 % | 22 km/h | 0.0 mm | High 26 |
| 5 Mar | 35.7 °C | 38 % | 22 km/h | 0.0 mm | High 25 |
| 6 Mar | 35.7 °C | 38 % | 18 km/h | 0.0 mm | High 27 |
| 7 Mar | 35.4 °C | 38 % | 22 km/h | 0.1 mm | High 28 |
| 8 Mar | 34.2 °C | 36 % | 35 km/h | 0.0 mm | High 30 |
| 9 Mar | 33.9 °C | 38 % | 26 km/h | 0.0 mm | High 27 |
| 10 Mar after | 34.8 °C | 38 % | 23 km/h | 0.0 mm | High 27 |
| 11 Mar after | 35.6 °C | 35 % | 35 km/h | 0.0 mm | High 30 |
| 12 Mar after | 36.3 °C | 33 % | 26 km/h | 0.0 mm | High 28 |
| 13 Mar after | 37.3 °C | 31 % | 24 km/h | 0.0 mm | High 30 |
| 14 Mar after | 36.2 °C | 38 % | 21 km/h | 0.0 mm | High 30 |
| 15 Mar after | 34.4 °C | 48 % | 22 km/h | 0.2 mm | High 23 |
| 16 Mar after | 31.0 °C | 58 % | 22 km/h | 1.0 mm | Moderate 13 |
Its twins: fires that started in the same weather
It started with an FWI of 18.0, a minimum humidity of 33% and 1 day without rain. Fires in the area that started in weather like this since 2016: 26.
FWI at the start
18.0
Minimum humidity
33 %
Days without rain
1
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Sanamxay fire, 23 February 2022
2,075 ha
15 days
FWI 18.0
Min. humidity 33 %
Ta Oi fire, March 2025
2,005 ha
21 days
FWI 19.0
Min. humidity 34 %
142 km away, in 2025
First rain (1 mm or more) after it ended: 1.0 mm on 6 Apr.
Sanamxay fire, February 2020
4,807 ha
17 days
FWI 22.0
Min. humidity 34 %
8 km away, in 2020
First rain (1 mm or more) after it ended: 3.6 mm on 13 Mar.
Ta Oi fire, April 2024
2,360 ha
10 days
FWI 20.2
Min. humidity 35 %
127 km away, in 2024
First rain (1 mm or more) after it ended: 1.3 mm on 15 Apr.
Ta Oi fire, April 2024
4,096 ha
14 days
FWI 20.2
Min. humidity 35 %
136 km away, in 2024
First rain (1 mm or more) after it ended: 1.3 mm on 15 Apr.
Sanxay fire, April 2025
2,133 ha
4 days
FWI 16.9
Min. humidity 36 %
94 km away, in 2025
First rain (1 mm or more) after it ended: 2.4 mm on 9 Apr.
What happened to them
- 14 days
- median duration
- 2,472 ha
- median area
- 100 %
- went past 1,000 ha
- 2.5 mm
- rain at the end (median; 21 of 26 had it)
It burned an area similar to its twins (2,075 ha against a median of 2,472 ha) and lasted 15 days, against 14 days.
In 5 of 26, 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 2.5 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
1.0 mmfirst rain
16 Mar7 days after it ended
35km/h · max. gust
It was considered over on 9 Mar, and on 16 Mar 1.0 mm fell. We do not know whether the rain or the firefighters put it out. Twins with rain when they ended: 21 of 26, with a median of 2.5 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 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 · 16 Feb 2022
After · 16 Mar 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.
Detections table · 105Every 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
- 16,375 haSanamxayFebruary 2023 · 46 days · 4 km away
- 4,807 haSanamxay19 February 2020 · 17 days · 8 km away
- 6,496 haSanamxay15 February 2024 · 44 days · 12 km away
- 6,499 haSanamxay3 April 2022 · 11 days · 17 km away
- 3,775 haPaksxongFebruary 2026 · 24 days · 22 km away
- 3,824 haSanamxay19 February 2024 · 32 days · 27 km away
Frequently asked questions
- How long did the Sanamxay fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 23 February 2022 to 9 March 2022 (15 days). The perimeter dates it from 25 February 2022 to 2 March 2022.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 2,075 hectares (20.8 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Sanamxay (2,089 ha, 0.9 %).
- What was the weather like?
- During the fire the temperature reached 35.9 °C, humidity dropped to 29 % and gusts hit 35 km/h. The fire danger index (FWI) reached 30, 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: 26. Their median duration was 14 days and their median area 2,472 ha; 100 % went past 1,000 ha. In 5 of 26, 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 2.5 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.
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 adjusted with the VIIRS detections inside the perimeter, which said 25 February 2022 to 2 March 2022. 105 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 2020, 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.