Li fire, 1 February 2020 Li, Sam Ngao
The fire started on 1 February 2020 in Li, Thailand, and satellites saw it burning for 13 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 2,674 hectares from heat detections, spread across 2 municipalities.
It is the 93th largest in Chiang Mai Province since 2016 (of 463 with a page). Number 164 in Thailand in 2020, of 666.
The power measured by the satellite is low (24.9 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.
- Burnt area
- 2,674ha
- GWIS perimeter (Copernicus)
- Duration
- 13days
- 1 Feb 2020 – 13 Feb 2020
- Municipalities hit
- 2
- districts
- Started on
- 1 Feb
- 2020
- Heat detections
- 81
- in a single hotspot: 25 MW
- Danger at start
- 29
- High · FWI index
- Energy released
- 354MW
- 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 26 days without rain (1 mm or more) when it started.
This area had burned before
100% of the perimeter overlaps earlier fires recorded since 2016: 1,044 ha in 2016, 1,818 ha in 2017, 1,920 ha in 2018, 2,217 ha in 2019. Part of it burned more than once, so the yearly figures add up to more than the 2,677 ha that had burned before.
- 2,217 ha Sam Ngao fire, February 2019 21,139 ha in total; the hectares shown are those it shares with this fire
- 1,818 ha Sam Ngao fire, March 2017 6,069 ha in total; the hectares shown are those it shares with this fire
- 1,573 ha Li fire, March 2018 3,500 ha in total; the hectares shown are those it shares with this fire
- 498 ha Li fire, February 2016 1,622 ha in total; the hectares shown are those it shares with this fire
- 23 ha Sam Ngao fire, March 2018 1,254 ha in total; the hectares shown are those it shares with this fire
What happened to each town
-
Li where it started2,042 ha reached on 29 Jan1.1 %
-
645 ha reached on 8 Feb0.2 %
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) |
|---|---|---|---|---|---|
| 25 Jan | 29.8 °C | 21 % | 38 km/h | 0.0 mm | High 29 |
| 26 Jan | 28.4 °C | 17 % | 30 km/h | 0.0 mm | High 29 |
| 27 Jan | 27.7 °C | 27 % | 28 km/h | 0.0 mm | High 28 |
| 28 Jan | 28.2 °C | 22 % | 18 km/h | 0.0 mm | High 27 |
| 29 Jan | 29.2 °C | 28 % | 22 km/h | 0.0 mm | High 28 |
| 30 Jan | 27.9 °C | 42 % | 30 km/h | 0.0 mm | High 23 |
| 31 Jan | 29.8 °C | 33 % | 28 km/h | 0.0 mm | High 22 |
| 1 Feb | 29.8 °C | 33 % | 27 km/h | 0.0 mm | High 23 |
| 2 Feb | 30.7 °C | 30 % | 25 km/h | 0.0 mm | High 24 |
| 3 Feb | 31.1 °C | 27 % | 22 km/h | 0.0 mm | High 27 |
| 4 Feb | 30.8 °C | 26 % | 27 km/h | 0.0 mm | High 27 |
| 5 Feb | 30.9 °C | 28 % | 33 km/h | 0.0 mm | High 28 |
| 6 Feb | 30.7 °C | 27 % | 30 km/h | 0.0 mm | High 28 |
| 7 Feb | 31.9 °C | 28 % | 25 km/h | 0.0 mm | High 27 |
| 8 Feb | 30.8 °C | 34 % | 28 km/h | 0.0 mm | High 28 |
| 9 Feb | 29.2 °C | 42 % | 34 km/h | 0.0 mm | High 26 |
| 10 Feb | 29.6 °C | 38 % | 27 km/h | 0.0 mm | High 24 |
| 11 Feb | 32.5 °C | 27 % | 23 km/h | 0.0 mm | High 28 |
| 12 Feb | 32.1 °C | 27 % | 37 km/h | 0.0 mm | High 31 |
| 13 Feb | 30.8 °C | 32 % | 46 km/h | 0.0 mm | High 34 |
| 14 Feb after | 29.7 °C | 33 % | 50 km/h | 0.0 mm | High 35 |
| 15 Feb after | 31.7 °C | 27 % | 26 km/h | 0.0 mm | High 29 |
| 16 Feb after | 31.7 °C | 27 % | 24 km/h | 0.0 mm | High 29 |
| 17 Feb after | 30.9 °C | 35 % | 36 km/h | 0.0 mm | High 31 |
| 18 Feb after | 29.0 °C | 43 % | 37 km/h | 0.0 mm | High 27 |
| 19 Feb after | 30.9 °C | 34 % | 24 km/h | 0.0 mm | High 25 |
| 20 Feb after | 30.4 °C | 34 % | 28 km/h | 0.0 mm | High 26 |
| 21 Feb after | 30.0 °C | 35 % | 35 km/h | 0.0 mm | High 27 |
| 22 Feb after | 29.6 °C | 35 % | 42 km/h | 0.0 mm | High 29 |
| 23 Feb after | 29.8 °C | 34 % | 29 km/h | 0.0 mm | High 26 |
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 · 81Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
- 21,139 haSam Ngao6 February 2019 · 33 days · 10 km away
- 12,196 haSam Ngao1 March 2024 · 19 days · 10 km away
- 45,311 haSam Ngao21 March 2026 · 35 days · 14 km away
- 18,226 haSam Ngao13 March 2025 · 19 days · 15 km away
- 28,586 haLi20 March 2026 · 24 days · 21 km away
- 20,120 haLi23 March 2026 · 33 days · 26 km away
Frequently asked questions
- How long did the Li fire last?
- GWIS (Copernicus) dates it between 1 February 2020 and 13 February 2020: 13 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 2,674 hectares (26.7 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 2 municipalities: Li (2,042 ha, 1.1 %); Sam Ngao (645 ha, 0.2 %).
- What was the weather like?
- During the fire the temperature reached 32.5 °C, humidity dropped to 17 % and gusts hit 46 km/h. The fire danger index (FWI) reached 34, class High.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Thailand (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.
Emergency number: 199 · 191
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.