Burned area
satellite only1,149ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 12 Mar 2017 – 15 Mar 2017
+− cross-check
No official record is matched to this page to compare it with.
TH · Thailand · –
Thoen fire, 12 March 2017 เถิน · Ban Dan Lan Hoi, Thoen, Thung Saliam
Out · last detection 15 Mar 2017, 18:48 UTC
The fire started on 12 March 2017 in Thoen, Thailand, and satellites saw it burning for 4 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 1,149 hectares from heat detections, spread across 3 municipalities.
It is the 96th largest in Lampang Province since 2016 (of 135 with a page). Number 123 in Thailand in 2017, of 155.
The power measured by the satellite is low (9.7 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.
Use this data
Compare with…
Use this data
Fire page data · version 2026-10-26matches 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 only4days
12 Mar 2017 to 15 Mar 2017: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 15 Mar 2017, 18:48 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 only12 Mar 2017
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 12 Mar 2017
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only25
VIIRS detections at 375 m. Most intense hotspot: 10 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 12 Mar 2017 – 15 Mar 2017
+− cross-check
There is no official record to compare with. Each hotspot is a pixel detected in one satellite pass, not a separate fire.
The worst day
satellite only43MW
Total radiative power on 13 March 2017; hotspots that day: 8.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 13 Mar 2017
+− 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
model37.9FWI · high
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 58.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 12 Mar 2017, 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
model39.1°C · 20% RH
High of 39.1 °C and minimum humidity of 20% on 13 March 2017; gusts of 35 km/h on 12 March 2017.
- Source
- weather model at the fire’s grid cell
- Date
- 12 Mar 2017 – 15 Mar 2017
- 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.
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
-
logStart date: 13 March 2017 → 12 March 2017.
-
· reconstructed GHSLPopulation and built-up area computed
What was saved on 26 October 2026
Every night a snapshot of what the page shows is saved. If anything changes, it appears in the list as a log entry.
- Area
- 1,149 ha
- Dates
- 12 Mar 2017 – 15 Mar 2017
- Name
- Thoen
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/thoen-2017-03-6?v=2026-10-26A 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 thoen-2017-03-6.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2017-03-12 | 0 | 0 | 38.1 | 23.5 | 27 | 15.3 | 34.9 | 0 | 37.9 | alto | 1 |
| 2017-03-13 | 8 | 43 | 39.1 | 21.8 | 20 | 11.5 | 31 | 0 | 40.1 | muy_alto | 1 |
| 2017-03-14 | 11 | 33 | 38.1 | 21.9 | 27 | 8.7 | 22.7 | 0 | 37.9 | alto | 1 |
| 2017-03-15 | 6 | 13 | 38 | 19.2 | 24 | 9.8 | 23.8 | 0 | 39.3 | muy_alto | 1 |
| 2017-03-16 | 0 | 0 | 36.9 | 22.3 | 31 | 14.6 | 37.8 | 0.2 | 40.8 | muy_alto | 0 |
| 2017-03-17 | 0 | 0 | 35.6 | 23.7 | 36 | 14.4 | 36.4 | 0.8 | 29.9 | alto | 0 |
| 2017-03-18 | 0 | 0 | 36.2 | 24.1 | 35 | 13.4 | 29.9 | 0.3 | 31.4 | alto | 0 |
| 2017-03-19 | 0 | 0 | 37.5 | 22.9 | 24 | 11.7 | 28.8 | 0 | 37.2 | alto | 0 |
| 2017-03-20 | 0 | 0 | 38.1 | 22.1 | 18 | 10.5 | 26.6 | 0 | 41.2 | muy_alto | 0 |
| 2017-03-21 | 0 | 0 | 37.6 | 22.6 | 24 | 13.3 | 33.1 | 0 | 44.3 | muy_alto | 0 |
| 2017-03-22 | 0 | 0 | 37.6 | 22.3 | 24 | 8.4 | 23.4 | 0 | 39.8 | muy_alto | 0 |
| 2017-03-23 | 0 | 0 | 37.3 | 21.3 | 30 | 9.7 | 27.4 | 0 | 38.2 | muy_alto | 0 |
| 2017-03-24 | 0 | 0 | 38.2 | 23.5 | 29 | 12 | 28.4 | 0 | 40.6 | muy_alto | 0 |
| 2017-03-25 | 0 | 0 | 37.3 | 24.1 | 33 | 10.9 | 25.2 | 0 | 37.4 | 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
- 1,149ha
- GWIS perimeter (Copernicus)
- Duration
- 4days
- 12 Mar 2017 – 15 Mar 2017
- Municipalities hit
- 3
- districts
- Started on
- 12 Mar
- 2017
- Heat detections
- 25
- in a single hotspot: 10 MW
- Danger at start
- 38
- High · FWI index
- Average daily power
- 30MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
12 Mar15 Mar
15 Mar 2017
How it evolved, day by day
13 Mar
14 Mar
15 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
35km/h · peak gust
20%lowest humidity
It had gone 58 days without rain (1 mm or more) when it started.
This area had burned before
20% of the perimeter overlaps earlier fires recorded since 2016: 230 ha in 2016.
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
-
Ban Dan Lan Hoi บ้านด่านลานหอย688 ha reached on 13 Mar0.7 %
-
404 ha reached on 13 Mar0.2 %
-
Thung Saliam ทุ่งเสลี่ยม64 ha reached on 14 Mar0.1 %
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 2015Built-up area< 0.1 ha
Residents< 20
Inside the perimeter there was no noticeable built-up land and almost nobody lived there (GHSL 2015, 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) |
|---|---|---|---|---|---|
| 12 Mar | 38.1 °C | 27 % | 35 km/h | 0.0 mm | High 38 |
| 13 Mar | 39.1 °C | 20 % | 31 km/h | 0.0 mm | Very high 40 |
| 14 Mar | 38.1 °C | 27 % | 23 km/h | 0.0 mm | High 38 |
| 15 Mar | 38.0 °C | 24 % | 24 km/h | 0.0 mm | Very high 39 |
| 16 Mar after | 36.9 °C | 31 % | 38 km/h | 0.2 mm | Very high 41 |
| 17 Mar after | 35.6 °C | 36 % | 36 km/h | 0.8 mm | High 30 |
| 18 Mar after | 36.2 °C | 35 % | 30 km/h | 0.3 mm | High 31 |
| 19 Mar after | 37.5 °C | 24 % | 29 km/h | 0.0 mm | High 37 |
| 20 Mar after | 38.1 °C | 18 % | 27 km/h | 0.0 mm | Very high 41 |
| 21 Mar after | 37.6 °C | 24 % | 33 km/h | 0.0 mm | Very high 44 |
| 22 Mar after | 37.6 °C | 24 % | 23 km/h | 0.0 mm | Very high 40 |
| 23 Mar after | 37.3 °C | 30 % | 27 km/h | 0.0 mm | Very high 38 |
| 24 Mar after | 38.2 °C | 29 % | 28 km/h | 0.0 mm | Very high 41 |
| 25 Mar after | 37.3 °C | 33 % | 25 km/h | 0.0 mm | High 37 |
Its twins: fires that started in the same weather
It started with an FWI of 37.9, a minimum humidity of 27% and 58 days without rain. Fires in the area that started in weather like this since 2016: 40.
FWI at the start
37.9
Minimum humidity
27 %
Days without rain
58
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Thoen fire, 12 March 2017
1,149 ha
4 days
FWI 37.9
Min. humidity 27 %
Si Satchanalai fire, March 2020
1,334 ha
17 days
FWI 37.6
Min. humidity 29 %
36 km away, in 2020
First rain (1 mm or more) after it ended: 7.1 mm on 13 Apr.
Thung Saliam fire, March 2020
1,289 ha
14 days
FWI 38.6
Min. humidity 25 %
22 km away, in 2020
First rain (1 mm or more) after it ended: 7.1 mm on 13 Apr.
Mae Sariang fire, March 2019
1,133 ha
10 days
FWI 37.1
Min. humidity 27 %
188 km away, in 2019
First rain (1 mm or more) after it ended: none in the following ten days.
Wang Chin fire, March 2020
1,355 ha
8 days
FWI 37.0
Min. humidity 25 %
69 km away, in 2020
First rain (1 mm or more) after it ended: none in the following ten days.
Mueang Pan fire, March 2020
1,215 ha
12 days
FWI 36.4
Min. humidity 27 %
174 km away, in 2020
First rain (1 mm or more) after it ended: none in the following ten days.
What happened to them
- 11 days
- median duration
- 1,508 ha
- median area
- 100 %
- went past 1,000 ha
- 3.2 mm
- rain at the end (median; 18 of 40 had it)
It burned an area similar to its twins (1,149 ha against a median of 1,508 ha) and lasted 4 days, against 11 days.
In 22 of 40, 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 3.2 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
35km/h · max. gust
It was considered over on 15 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 40, with a median of 3.2 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 · 5 Mar 2017
After · 22 Mar 2017
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 · 25Every 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
Frequently asked questions
- How long did the Thoen fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 12 March 2017 to 15 March 2017 (4 days). The perimeter dates it from 13 March 2017 to 15 March 2017.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 1,149 hectares (11.5 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 3 municipalities: Ban Dan Lan Hoi (688 ha, 0.7 %); Thoen (404 ha, 0.2 %); Thung Saliam (64 ha, 0.1 %).
- What was the weather like?
- During the fire the temperature reached 39.1 °C, humidity dropped to 20 % and gusts hit 35 km/h. The fire danger index (FWI) reached 40, 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: 40. Their median duration was 11 days and their median area 1,508 ha; 100 % went past 1,000 ha. In 22 of 40, 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 3.2 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 · 1 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
- Start date: 13 March 2017 → 12 March 2017.
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.
- Dates adjusted with the VIIRS detections inside the perimeter, which said 13 March 2017 to 15 March 2017. 25 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 2015, 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.