Burned area
satellite only3,742ha
Union of 2 GWIS (Copernicus) perimeters: overlapping areas count once.
- Source
- GWIS (Copernicus)
- Date
- 5 Mar 2020 – 18 Mar 2020
+− cross-check
No official record is matched to this page to compare it with.
TH · Thailand · –
Mae La Noi fire, 5 March 2020 แม่ลาน้อย · Mae La Noi
Out · last detection 18 Mar 2020, 18:41 UTC
The fire started on 5 March 2020 in Mae La Noi, Thailand, and satellites saw it burning for 14 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 3,742 hectares from heat detections, spread across a single municipality.
It is the 52th largest in Mae Hong Son Province since 2016 (of 361 with a page). Number 55 in Thailand in 2020, of 457.
Use this data
Compare with…
Use this data
Fire page data · version 2026-10-27matches 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 only14days
5 Mar 2020 to 18 Mar 2020: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 18 Mar 2020, 18:41 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 only5 Mar 2020
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 5 Mar 2020
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
The worst day
satellite only145MW
Total radiative power on 18 March 2020; hotspots that day: 11.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 18 Mar 2020
+− 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
model33.7FWI · high
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 60.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 5 Mar 2020, 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
model39.3°C · 29% RH
High of 39.3 °C and minimum humidity of 29% on 14 March 2020; gusts of 43 km/h on 6 March 2020.
- Source
- weather model at the fire’s grid cell
- Date
- 5 Mar 2020 – 18 Mar 2020
- 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≈ 350people
Estimated residents inside the perimeter and 2.6 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
-
logLast day with fire: 22 March 2020 → 18 March 2020.
-
logStart date: 29 February 2020 → 5 March 2020.
-
logLast day with fire: 18 March 2020 → 22 March 2020.
-
logStart date: 5 March 2020 → 29 February 2020.
-
· reconstructed GHSLPopulation and built-up area computed
Area logged each night
Move the slider to see which area the page published each day.
Versioned permanent link
https://worldfires.org/en/fire/mae-la-noi-2020-03?v=2026-10-27A 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 mae-la-noi-2020-03.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2020-03-05 | 4 | 5 | 35.2 | 20.1 | 30 | 13.9 | 41.4 | 0 | 33.7 | alto | 1 |
| 2020-03-06 | 16 | 33 | 35.5 | 21.6 | 34 | 13.9 | 43.2 | 0 | 34 | alto | 1 |
| 2020-03-07 | 10 | 22 | 35.8 | 21.2 | 32 | 11.9 | 36.7 | 0 | 32.7 | alto | 1 |
| 2020-03-08 | 3 | 5 | 35.9 | 21.1 | 32 | 13 | 39.2 | 0 | 33.8 | alto | 1 |
| 2020-03-09 | 7 | 16 | 36.6 | 21.7 | 31 | 12.6 | 39.2 | 0 | 33.8 | alto | 1 |
| 2020-03-10 | 9 | 80 | 36.6 | 21.4 | 27 | 11.9 | 33.8 | 0 | 35.6 | alto | 1 |
| 2020-03-11 | 7 | 13 | 37.7 | 21.6 | 23 | 12.8 | 38.5 | 0 | 39.9 | muy_alto | 1 |
| 2020-03-12 | 12 | 24 | 38.1 | 20.6 | 25 | 10.5 | 33.8 | 0 | 38.1 | muy_alto | 1 |
| 2020-03-13 | 4 | 11 | 39.2 | 22 | 27 | 11 | 31.3 | 0 | 38.8 | muy_alto | 1 |
| 2020-03-14 | 1 | 5 | 39.3 | 22.3 | 29 | 8 | 26.6 | 0 | 36.4 | alto | 1 |
| 2020-03-15 | 1 | 4 | 39 | 23.7 | 32 | 11.5 | 32.4 | 0 | 39.5 | muy_alto | 1 |
| 2020-03-16 | 15 | 26 | 38.4 | 24.3 | 28 | 13.4 | 38.5 | 0 | 41.6 | muy_alto | 1 |
| 2020-03-17 | 23 | 45 | 38.3 | 22.8 | 27 | 12.9 | 38.5 | 0 | 41.4 | muy_alto | 1 |
| 2020-03-18 | 11 | 145 | 37.8 | 22.9 | 31 | 12 | 38.2 | 0 | 40.2 | muy_alto | 1 |
| 2020-03-19 | 0 | 0 | 37.3 | 22.1 | 30 | 11.6 | 33.1 | 0 | 40 | muy_alto | 0 |
| 2020-03-20 | 0 | 0 | 37 | 22.9 | 29 | 14.5 | 42.1 | 0 | 43.1 | muy_alto | 0 |
| 2020-03-21 | 0 | 0 | 35.8 | 21.8 | 37 | 15.2 | 45.4 | 0.5 | 38.7 | muy_alto | 0 |
| 2020-03-22 | 0 | 0 | 36 | 22 | 31 | 14 | 40.7 | 0 | 37.8 | alto | 0 |
| 2020-03-23 | 0 | 0 | 37 | 21.5 | 28 | 13.7 | 41.8 | 0 | 37.9 | alto | 0 |
| 2020-03-24 | 0 | 0 | 36.9 | 21.4 | 29 | 16.1 | 47.9 | 0 | 40.3 | muy_alto | 0 |
| 2020-03-25 | 0 | 0 | 37.1 | 22.1 | 26 | 16.1 | 46.1 | 0 | 41.6 | muy_alto | 0 |
| 2020-03-26 | 0 | 0 | 36.8 | 21.6 | 30 | 14.6 | 44.6 | 0 | 40.4 | muy_alto | 0 |
| 2020-03-27 | 0 | 0 | 37.6 | 23.5 | 28 | 12.4 | 38.5 | 0 | 38.5 | muy_alto | 0 |
| 2020-03-28 | 0 | 0 | 38.5 | 23 | 32 | 12.9 | 37.1 | 0 | 39.2 | muy_alto | 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
- 3,742ha
- GWIS perimeter (Copernicus)
- Duration
- 14days
- 5 Mar 2020 – 18 Mar 2020
- Municipalities hit
- 1
- districts
- Started on
- 5 Mar
- 2020
- Heat detections
- 123
- in a single hotspot: 0 MW
- Danger at start
- 34
- High · FWI index
- Average daily power
- 31MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
5 Mar18 Mar
18 Mar 2020
How it evolved, day by day
5 Mar
8 Mar
11 Mar
14 Mar
18 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
39°high
43km/h · peak gust
23%lowest humidity
It had gone more than two months without rain (1 mm or more) when it started.
This area had burned before
No earlier perimeters overlap this fire since 2016, when the satellite record begins.
How big is it?
London boundary: geoBoundaries · Office for National Statistics (Open Government Licence v3.0).
Bangkok boundary: geoBoundaries · OpenStreetMap, Wambacher · © OpenStreetMap contributors (ODbL 1.0).
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).
This compares size, not location: both shapes are at the same scale, north up, centred on each other.
What happened to each town
-
3,764 ha2.7 %
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 area2.6 ha
Residents≈ 350
Inside the perimeter there were about 2.6 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)
Started with 60 days without rain: 14 % of the area in Thailand
| Day | High | Min. humidity | Peak gust | Rain | Danger (FWI) |
|---|---|---|---|---|---|
| 5 Mar | 35.2 °C | 30 % | 41 km/h | 0.0 mm | High 34 |
| 6 Mar | 35.5 °C | 34 % | 43 km/h | 0.0 mm | High 34 |
| 7 Mar | 35.8 °C | 32 % | 37 km/h | 0.0 mm | High 33 |
| 8 Mar | 35.9 °C | 32 % | 39 km/h | 0.0 mm | High 34 |
| 9 Mar | 36.6 °C | 31 % | 39 km/h | 0.0 mm | High 34 |
| 10 Mar | 36.6 °C | 27 % | 34 km/h | 0.0 mm | High 36 |
| 11 Mar | 37.7 °C | 23 % | 38 km/h | 0.0 mm | Very high 40 |
| 12 Mar | 38.1 °C | 25 % | 34 km/h | 0.0 mm | Very high 38 |
| 13 Mar | 39.2 °C | 27 % | 31 km/h | 0.0 mm | Very high 39 |
| 14 Mar | 39.3 °C | 29 % | 27 km/h | 0.0 mm | High 36 |
| 15 Mar | 39.0 °C | 32 % | 32 km/h | 0.0 mm | Very high 40 |
| 16 Mar | 38.4 °C | 28 % | 38 km/h | 0.0 mm | Very high 42 |
| 17 Mar | 38.3 °C | 27 % | 38 km/h | 0.0 mm | Very high 41 |
| 18 Mar | 37.8 °C | 31 % | 38 km/h | 0.0 mm | Very high 40 |
| 19 Mar after | 37.3 °C | 30 % | 33 km/h | 0.0 mm | Very high 40 |
| 20 Mar after | 37.0 °C | 29 % | 42 km/h | 0.0 mm | Very high 43 |
| 21 Mar after | 35.8 °C | 37 % | 45 km/h | 0.5 mm | Very high 39 |
| 22 Mar after | 36.0 °C | 31 % | 41 km/h | 0.0 mm | High 38 |
| 23 Mar after | 37.0 °C | 28 % | 42 km/h | 0.0 mm | High 38 |
| 24 Mar after | 36.9 °C | 29 % | 48 km/h | 0.0 mm | Very high 40 |
| 25 Mar after | 37.1 °C | 26 % | 46 km/h | 0.0 mm | Very high 42 |
| 26 Mar after | 36.8 °C | 30 % | 45 km/h | 0.0 mm | Very high 40 |
| 27 Mar after | 37.6 °C | 28 % | 38 km/h | 0.0 mm | Very high 38 |
| 28 Mar after | 38.5 °C | 32 % | 37 km/h | 0.0 mm | Very high 39 |
Its twins: fires that started in the same weather
It started with an FWI of 33.7, a minimum humidity of 30% and more than two months without rain. Fires in the area that started in weather like this since 2016: 37.
FWI at the start
33.7
Minimum humidity
30 %
Days without rain
60+
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Mae La Noi fire, 5 March 2020
3,742 ha
14 days
FWI 33.7
Min. humidity 30 %
Mae La Noi fire, March 2018
3,575 ha
18 days
FWI 34.0
Min. humidity 30 %
13 km away, in 2018
First rain (1 mm or more) after it ended: 1.3 mm on 2 Apr.
Khun Yuam fire, March 2018
3,154 ha
12 days
FWI 34.3
Min. humidity 30 %
18 km away, in 2018
First rain (1 mm or more) after it ended: 2.4 mm on 1 Apr.
Tha Song Yang fire, April 2020
1,329 ha
8 days
FWI 33.1
Min. humidity 30 %
82 km away, in 2020
First rain (1 mm or more) after it ended: 1.0 mm on 25 Apr.
Sop Moei fire, April 2019
4,119 ha
19 days
FWI 33.7
Min. humidity 29 %
62 km away, in 2019
First rain (1 mm or more) after it ended: none in the following ten days.
Hpapun fire, March 2020
3,992 ha
8 days
FWI 33.0
Min. humidity 31 %
56 km away, in 2020
First rain (1 mm or more) after it ended: none in the following ten days.
What happened to them
- 12 days
- median duration
- 2,294 ha
- median area
- 100 %
- went past 1,000 ha
- 2.0 mm
- rain at the end (median; 18 of 37 had it)
It was 1.6 times larger than the median of its twins and lasted 14 days, against 12 days.
Only 10 of its 37 twins burned more. The weather on the first day does not explain everything: the wind in the following days, the fuel and the firefighting also count. In 19 of 37, 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 2.0 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
—first rain
—no rain in ten days
43km/h · max. gust
It was considered over on 18 Mar, and not even 1 mm fell in the following ten days: it went out without rain. Twins with rain when they ended: 18 of 37, with a median of 2.0 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 · 27 Feb 2020
After · 25 Mar 2020
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 · 0Every 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
- 12,729 haMae La Noi แม่ลาน้อย22 March 2026 · 27 days · 9 km away
- 9,835 haMae La Noi แม่ลาน้อย4 March 2024 · 22 days · 14 km away
- 157,976 haMae La Noi แม่ลาน้อย18 March 2026 · 41 days · 21 km away
- 22,090 haMae Sariang แม่สะเรียง19 March 2018 · 30 days · 30 km away
- 18,375 haMae Sariang แม่สะเรียง5 March 2017 · 28 days · 36 km away
Frequently asked questions
- How long did the Mae La Noi fire last?
- GWIS (Copernicus) dates it between 5 March 2020 and 18 March 2020: 14 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 3,742 hectares (37.4 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Mae La Noi (3,764 ha, 2.7 %).
- What was the weather like?
- During the fire the temperature reached 39.3 °C, humidity dropped to 23 % and gusts hit 43 km/h. The fire danger index (FWI) reached 42, class Very 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.
- 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: 37. Their median duration was 12 days and their median area 2,294 ha; 100 % went past 1,000 ha. Only 10 of its 37 twins burned more. The weather on the first day does not explain everything: the wind in the following days, the fuel and the firefighting also count. In 19 of 37, 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 2.0 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.
Emergency number: 199 · 191 · Emergency number and official warnings
Satellite cross-check
History of this page · 4 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
- Last day with fire: 22 March 2020 → 18 March 2020.
- Start date: 29 February 2020 → 5 March 2020.
- Last day with fire: 18 March 2020 → 22 March 2020.
- Start date: 5 March 2020 → 29 February 2020.
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; 2 polygons grouped in this page.
- Dates from the perimeter: the VIIRS detections inside it did not change them. No 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.