How long did the Doi Lo fire last?

GWIS (Copernicus) dates it between 6 March 2024 and 15 March 2024: 10 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 5,683 hectares (56.8 km²). It is an estimate: official national figures may differ.

Which municipalities burned?

The fire entered 3 municipalities: Doi Lo (2,848 ha, 13 %); Chom Thong (1,475 ha, 1.3 %); Mae Wang (1,392 ha, 2.0 %).

What was the weather like?

During the fire the temperature reached 37.4 °C, humidity dropped to 24 % and gusts hit 35 km/h. The fire danger index (FWI) reached 38, 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.

TH · Thailand · 2024-03-06 → 2024-03-15

Doi Lo fire, March 2024 Doi Lo, Chom Thong, Mae Wang

Out · last detection 15 Mar 2024, 19:45 UTC

The fire started on 6 March 2024 in Doi Lo, Thailand, and satellites saw it burning for 10 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 5,683 hectares from heat detections, spread across 3 municipalities.

It is the 26th largest in Chiang Mai Province since 2016 (of 463 with a page). Number 17 in Thailand in 2024, of 350.

The power measured by the satellite is low (10.5 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: 5,683ha; GWIS perimeter (Copernicus)
Duration: 10days; 6 Mar 2024 – 15 Mar 2024
Municipalities hit: 3; districts
Started on: 6 Mar; 2024
Heat detections: 186; in a single hotspot: 10 MW
Danger at start: 27; High · FWI index
Energy released: 444MW; sum of detected power

Play back 15 Mar 2024

HOTSPOTS BY DAY 6 Mar15 Mar

How it evolved, day by day

6789101112131415

Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.

The weather it burned in

37°high

35km/h · peak gust

24%lowest humidity

It had gone 30 days without rain (1 mm or more) when it started. Rain came after the fire: 13.0 mm on 20 Mar.

This area had burned before

91% of the perimeter overlaps earlier fires recorded since 2016: 1,050 ha in 2016, 2,660 ha in 2017, 602 ha in 2018, 2,524 ha in 2019, 1,354 ha in 2020, 1,677 ha in 2021, 1,376 ha in 2023. Part of it burned more than once, so the yearly figures add up to more than the 5,192 ha that had burned before.

What happened to each town

Doi Lo where it started

2,848 ha reached on 1 Mar

13 %
Chom Thong

1,475 ha reached on 4 Mar

1.3 %
Mae Wang

1,392 ha reached on 1 Mar

2.0 %

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)
1 Mar	36.1 °C	30 %	20 km/h	0.0 mm	High 27
2 Mar	37.1 °C	28 %	22 km/h	0.0 mm	High 28
3 Mar	35.8 °C	33 %	30 km/h	0.0 mm	High 32
4 Mar	36.4 °C	28 %	23 km/h	0.0 mm	High 31
5 Mar	36.0 °C	32 %	19 km/h	0.0 mm	High 29
6 Mar	35.7 °C	32 %	26 km/h	0.0 mm	High 31
7 Mar	35.1 °C	35 %	23 km/h	0.0 mm	High 30
8 Mar	37.2 °C	36 %	22 km/h	0.0 mm	High 30
9 Mar	37.4 °C	25 %	28 km/h	0.0 mm	High 35
10 Mar	36.5 °C	33 %	22 km/h	0.0 mm	High 34
11 Mar	36.3 °C	29 %	22 km/h	0.0 mm	High 32
12 Mar	36.6 °C	29 %	35 km/h	0.0 mm	Very high 38
13 Mar	36.4 °C	24 %	24 km/h	0.0 mm	High 34
14 Mar	34.8 °C	30 %	25 km/h	0.0 mm	High 33
15 Mar	34.5 °C	33 %	21 km/h	0.0 mm	High 32
16 Mar after	35.5 °C	35 %	26 km/h	0.0 mm	High 33
17 Mar after	34.9 °C	37 %	26 km/h	0.0 mm	High 31
18 Mar after	36.0 °C	38 %	24 km/h	0.0 mm	High 30
19 Mar after	36.5 °C	34 %	22 km/h	0.0 mm	High 32
20 Mar after	28.4 °C	69 %	24 km/h	13.0 mm	Very low 1

Before and after, from space

Drag the line to compare the same ground before the fire and after it.

↔

Before · 28 Feb 2024

After · 22 Mar 2024

Before After

If the day is cloudy, change the date: each satellite passes once a day. In false colour the burnt ground looks brown or red.

The smoke

CAMS · Copernicus

On 15 March 2024 the air beside the fire reached 68 µg/m³ of PM2.5. That day averaged 45: 3.0 times the WHO daily guideline (15).

PM2.5 peak68 µg/m³

Days over the guideline12 days

PM10100 µg/m³

Optical depth1.43

WHO 15

456789101112131415161718

Good Fair Moderate Poor Very poor Extremely poor

Particles from the Copernicus CAMS model at the centre of the perimeter; these are not measurements in each town. The pale bar is the worst hour, the solid one the daily average.

Open-Meteo.com (CC BY 4.0) · Copernicus Atmosphere Monitoring Service (CAMS)

Detections table · 186Every 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

All fires in Thailand ›

Frequently asked questions

How long did the Doi Lo fire last?: GWIS (Copernicus) dates it between 6 March 2024 and 15 March 2024: 10 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 5,683 hectares (56.8 km²). It is an estimate: official national figures may differ.
Which municipalities burned?: The fire entered 3 municipalities: Doi Lo (2,848 ha, 13 %); Chom Thong (1,475 ha, 1.3 %); Mae Wang (1,392 ha, 2.0 %).
What was the weather like?: During the fire the temperature reached 37.4 °C, humidity dropped to 24 % and gusts hit 35 km/h. The fire danger index (FWI) reached 38, 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.

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

NASA FIRMS ↗
GWIS · Copernicus ↗

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.

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What really happened?

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We will only use your email to reply about this report. Privacy. This is not an emergency service: if there is a fire now, call 199 · 191.

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.

Where it burned