May fire, 1 April 2026 May
The fire started on 1 April 2026 in May, Laos, and satellites saw it burning for 11 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 3,297 hectares from heat detections, spread across a single municipality.
It is the 16th largest in Phongsaly since 2016 (of 55 with a page). Number 133 in Laos in 2026, of 287.
- Burnt area
- 3,297ha
- GWIS perimeter (Copernicus)
- Duration
- 11days
- 1 Apr 2026 – 11 Apr 2026
- Municipalities hit
- 1
- districts
- Started on
- 1 Apr
- 2026
- Heat detections
- 117
- in a single hotspot: 185 MW
- Danger at start
- 19
- Moderate · FWI index
- Energy released
- 5.3GW
- sum of detected power
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 8 days without rain (1 mm or more) when it started. Rain came after the fire: 12.1 mm on 19 Apr.
This area had burned before
78% of the perimeter overlaps earlier fires recorded since 2016: 1,511 ha in 2016, 1,508 ha in 2019, 504 ha in 2021, 688 ha in 2022, 198 ha in 2024, 347 ha in 2025. Part of it burned more than once, so the yearly figures add up to more than the 2,563 ha that had burned before.
- 1,019 ha May fire, April 2016 2,443 ha in total; the hectares shown are those it shares with this fire
- 504 ha May fire, April 2021 2,270 ha in total; the hectares shown are those it shares with this fire
- 34 ha May fire, April 2024 3,775 ha in total; the hectares shown are those it shares with this fire
What happened to each town
-
May where it started3,314 ha reached on 1 Apr1.2 %
Burnt area inside each municipality, from crossing the GWIS perimeter with administrative boundaries. The distance is from the town centre to the nearest fire: staying a kilometre away does not mean it reached the houses.
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 | 30.7 °C | 40 % | 31 km/h | 0.0 mm | Moderate 19 |
| 2 Apr | 31.0 °C | 40 % | 49 km/h | 0.0 mm | Moderate 20 |
| 3 Apr | 34.6 °C | 26 % | 42 km/h | 0.0 mm | High 25 |
| 4 Apr | 33.8 °C | 28 % | 40 km/h | 0.0 mm | High 26 |
| 5 Apr | 33.2 °C | 34 % | 50 km/h | 0.0 mm | High 29 |
| 6 Apr | 34.4 °C | 32 % | 41 km/h | 0.0 mm | High 26 |
| 7 Apr | 33.4 °C | 37 % | 38 km/h | 0.0 mm | High 25 |
| 8 Apr | 32.9 °C | 38 % | 41 km/h | 1.7 mm | Moderate 15 |
| 9 Apr | 32.3 °C | 37 % | 44 km/h | 0.0 mm | High 22 |
| 10 Apr | 30.9 °C | 38 % | 47 km/h | 0.0 mm | High 23 |
| 11 Apr | 31.3 °C | 36 % | 47 km/h | 0.0 mm | High 24 |
| 12 Apr after | 33.1 °C | 25 % | 38 km/h | 0.0 mm | High 28 |
| 13 Apr after | 34.3 °C | 28 % | 35 km/h | 0.0 mm | High 28 |
| 14 Apr after | 32.9 °C | 35 % | 37 km/h | 0.0 mm | High 29 |
| 15 Apr after | 33.1 °C | 35 % | 39 km/h | 0.0 mm | High 29 |
| 16 Apr after | 32.7 °C | 35 % | 31 km/h | 0.0 mm | High 28 |
| 17 Apr after | 33.5 °C | 34 % | 30 km/h | 0.0 mm | High 28 |
| 18 Apr after | 29.7 °C | 49 % | 32 km/h | 0.1 mm | High 22 |
| 19 Apr after | 29.6 °C | 52 % | 36 km/h | 12.1 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 14 April 2026 the air beside the fire reached 188 µg/m³ of PM2.5. That day averaged 105: 7.0 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 · 117Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
Frequently asked questions
- How long did the May fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 1 April 2026 to 11 April 2026 (11 days). The perimeter dates it from 1 April 2026 to 4 April 2026.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 3,297 hectares (33.0 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered May (3,314 ha, 1.2 %).
- What was the weather like?
- During the fire the temperature reached 34.6 °C, humidity dropped to 26 % and gusts hit 50 km/h. The fire danger index (FWI) reached 29, 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.
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
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
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.