Nambak fire, April 2019 Nambak, Ngoi
The fire started on 8 April 2019 in Nambak, Laos, and satellites saw it burning for 15 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 5,697 hectares from heat detections, spread across 2 municipalities.
It is the 41th largest in Luang Prabang since 2016 (of 295 with a page). Number 15 in Laos in 2019, of 126.
Compare with…
Suggestions: Ngoi · 2018Ngoi · 2017Park Ou · 2026Ngoi · 2023
- Burnt area
- 5,697ha
- GWIS perimeter (Copernicus)
- Duration
- 15days
- 8 Apr 2019 – 22 Apr 2019
- Municipalities hit
- 2
- districts
- Started on
- 8 Apr
- 2019
- Heat detections
- 175
- in a single hotspot: 174 MW
- Danger at start
- 25
- High · FWI index
- Average daily power
- 272MW
- 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 one day without rain (1 mm or more) when it started. Rain came after the fire: 1.2 mm on 28 Apr.
This area had burned before
44% of the perimeter overlaps earlier fires recorded since 2016: 1,050 ha in 2017, 2,144 ha in 2018. Part of it burned more than once, so the yearly figures add up to more than the 2,522 ha that had burned before.
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
-
Nambak where it started5,226 ha2.7 %
-
498 ha0.3 %
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 2020Inside the perimeter there were about 0.40 hectares of built-up land and about 350 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) |
|---|---|---|---|---|---|
| 8 Apr | 33.6 °C | 31 % | 40 km/h | 0.0 mm | High 25 |
| 9 Apr | 33.7 °C | 32 % | 37 km/h | 0.0 mm | High 25 |
| 10 Apr | 33.4 °C | 34 % | 38 km/h | 0.0 mm | High 26 |
| 11 Apr | 33.8 °C | 29 % | 32 km/h | 0.0 mm | High 27 |
| 12 Apr | 34.3 °C | 32 % | 36 km/h | 0.0 mm | High 28 |
| 13 Apr | 34.9 °C | 31 % | 38 km/h | 0.0 mm | High 29 |
| 14 Apr | 34.9 °C | 33 % | 36 km/h | 0.0 mm | High 28 |
| 15 Apr | 35.5 °C | 38 % | 45 km/h | 0.0 mm | High 31 |
| 16 Apr | 36.2 °C | 32 % | 34 km/h | 0.2 mm | High 29 |
| 17 Apr | 35.3 °C | 35 % | 45 km/h | 0.0 mm | High 32 |
| 18 Apr | 37.0 °C | 24 % | 45 km/h | 0.0 mm | High 37 |
| 19 Apr | 37.6 °C | 22 % | 42 km/h | 0.0 mm | Very high 39 |
| 20 Apr | 37.6 °C | 20 % | 38 km/h | 0.0 mm | Very high 39 |
| 21 Apr | 36.4 °C | 31 % | 36 km/h | 0.0 mm | High 36 |
| 22 Apr | 34.9 °C | 36 % | 38 km/h | 0.8 mm | High 25 |
| 23 Apr after | 34.2 °C | 38 % | 37 km/h | 0.7 mm | High 23 |
| 24 Apr after | 35.0 °C | 36 % | 36 km/h | 0.1 mm | High 26 |
| 25 Apr after | 34.0 °C | 38 % | 32 km/h | 0.0 mm | High 26 |
| 26 Apr after | 36.2 °C | 28 % | 32 km/h | 0.2 mm | High 33 |
| 27 Apr after | 32.7 °C | 38 % | 45 km/h | 0.0 mm | High 30 |
| 28 Apr after | 32.7 °C | 40 % | 46 km/h | 1.2 mm | High 22 |
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.
Detections table · 175Every 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 Nambak fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 8 April 2019 to 22 April 2019 (15 days). The perimeter dates it from 8 April 2019 to 15 April 2019.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 5,697 hectares (57.0 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 2 municipalities: Nambak (5,226 ha, 2.7 %); Ngoi (498 ha, 0.3 %).
- What was the weather like?
- During the fire the temperature reached 37.6 °C, humidity dropped to 20 % and gusts hit 45 km/h. The fire danger index (FWI) reached 39, class Very 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
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: GWIS (Copernicus), rebuilt from heat detections rather than mapped on imagery.
- Dates adjusted with the VIIRS detections inside the perimeter, which said 8 April 2019 to 15 April 2019. 175 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.