Nan fire, March 2019 Nan, Xieng Ngeun, Luangprabang
The fire started on 30 March 2019 in Nan, Laos, and satellites saw it burning for 22 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 3,624 hectares from heat detections, spread across 3 municipalities.
It is the 94th largest in Luang Prabang since 2016 (of 293 with a page). Number 39 in Laos in 2019, of 117.
- Burnt area
- 3,624ha
- GWIS perimeter (Copernicus)
- Duration
- 22days
- 30 Mar 2019 – 20 Apr 2019
- Municipalities hit
- 3
- districts
- Started on
- 30 Mar
- 2019
- Heat detections
- 162
- in a single hotspot: 410 MW
- Danger at start
- 18
- Moderate · FWI index
- Energy released
- 5.6GW
- 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 0 days without rain (1 mm or more) when it started.
This area had burned before
84% of the perimeter overlaps earlier fires recorded since 2016: 2,014 ha in 2016, 1,657 ha in 2017, 2,436 ha in 2018. Part of it burned more than once, so the yearly figures add up to more than the 3,052 ha that had burned before.
- 1,959 ha Nan fire, April 2018 3,358 ha in total; the hectares shown are those it shares with this fire
- 1,047 ha Nan fire, April 2017 2,562 ha in total; the hectares shown are those it shares with this fire
- 476 ha Xieng Ngeun fire, April 2018 2,914 ha in total; the hectares shown are those it shares with this fire
- 2 ha Xieng Ngeun fire, April 2017 2,513 ha in total; the hectares shown are those it shares with this fire
What happened to each town
-
Nan where it started3,228 ha reached on 30 Mar2.2 %
-
310 ha reached on 6 Apr0.2 %
-
111 ha reached on 31 Mar0.1 %
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) |
|---|---|---|---|---|---|
| 30 Mar | 33.8 °C | 31 % | 28 km/h | 0.0 mm | Moderate 18 |
| 31 Mar | 34.0 °C | 38 % | 35 km/h | 0.0 mm | Moderate 20 |
| 1 Apr | 33.8 °C | 41 % | 33 km/h | 1.6 mm | Moderate 12 |
| 2 Apr | 31.1 °C | 53 % | 35 km/h | 0.0 mm | Moderate 14 |
| 3 Apr | 31.7 °C | 46 % | 31 km/h | 0.3 mm | Moderate 16 |
| 4 Apr | 31.6 °C | 55 % | 30 km/h | 4.0 mm | Very low 3 |
| 5 Apr | 29.3 °C | 57 % | 35 km/h | 0.4 mm | Low 7 |
| 6 Apr | 30.6 °C | 61 % | 40 km/h | 0.4 mm | Low 10 |
| 7 Apr | 32.0 °C | 47 % | 35 km/h | 0.0 mm | Moderate 14 |
| 8 Apr | 35.0 °C | 34 % | 40 km/h | 0.2 mm | High 22 |
| 9 Apr | 34.6 °C | 35 % | 37 km/h | 0.0 mm | High 22 |
| 10 Apr | 34.0 °C | 39 % | 38 km/h | 0.0 mm | High 23 |
| 11 Apr | 35.1 °C | 33 % | 35 km/h | 0.0 mm | High 24 |
| 12 Apr | 35.2 °C | 37 % | 40 km/h | 0.0 mm | High 25 |
| 13 Apr | 35.1 °C | 38 % | 38 km/h | 0.0 mm | High 26 |
| 14 Apr | 34.8 °C | 41 % | 37 km/h | 0.0 mm | High 26 |
| 15 Apr | 35.4 °C | 42 % | 42 km/h | 0.2 mm | High 26 |
| 16 Apr | 36.1 °C | 38 % | 35 km/h | 0.0 mm | High 25 |
| 17 Apr | 35.8 °C | 43 % | 44 km/h | 0.0 mm | High 27 |
| 18 Apr | 36.4 °C | 36 % | 42 km/h | 0.0 mm | High 28 |
| 19 Apr | 37.4 °C | 31 % | 41 km/h | 0.1 mm | High 31 |
| 20 Apr | 37.6 °C | 31 % | 37 km/h | 0.0 mm | High 30 |
| 21 Apr after | 37.0 °C | 35 % | 38 km/h | 0.8 mm | High 26 |
| 22 Apr after | 33.9 °C | 44 % | 35 km/h | 0.0 mm | High 25 |
| 23 Apr after | 33.4 °C | 44 % | 32 km/h | 0.0 mm | High 25 |
| 24 Apr after | 34.9 °C | 45 % | 31 km/h | 0.0 mm | High 25 |
| 25 Apr after | 35.0 °C | 41 % | 30 km/h | 0.0 mm | High 26 |
| 26 Apr after | 34.3 °C | 39 % | 34 km/h | 0.4 mm | High 26 |
| 27 Apr after | 34.7 °C | 38 % | 41 km/h | 0.0 mm | High 26 |
| 28 Apr after | 33.7 °C | 44 % | 43 km/h | 0.4 mm | High 28 |
| 29 Apr after | 35.6 °C | 41 % | 45 km/h | 0.0 mm | High 29 |
| 30 Apr after | 34.6 °C | 42 % | 43 km/h | 0.1 mm | High 27 |
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 · 162Every 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 Nan fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 30 March 2019 to 20 April 2019 (22 days). The perimeter dates it from 5 April 2019 to 13 April 2019.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 3,624 hectares (36.2 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 3 municipalities: Nan (3,228 ha, 2.2 %); Xieng Ngeun (310 ha, 0.2 %); Luangprabang (111 ha, 0.1 %).
- What was the weather like?
- During the fire the temperature reached 37.6 °C, humidity dropped to 31 % and gusts hit 44 km/h. The fire danger index (FWI) reached 31, 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.