How long did the Dan Sai fire last?

GWIS (Copernicus) dates it between 21 February 2019 and 25 February 2019: 5 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 1,203 hectares (12.0 km²). It is an estimate: official national figures may differ.

Which municipalities burned?

The fire only entered Dan Sai (1,143 ha, 0.8 %).

What was the weather like?

During the fire the temperature reached 34.1 °C, humidity dropped to 31 % and gusts hit 31 km/h. The fire danger index (FWI) reached 19, class Moderate.

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 · 2019-02-21 → 2019-02-25

Dan Sai fire, February 2019 ด่านซ้าย · Dan Sai

Out · last detection 25 Feb 2019, 07:07 UTC

The fire started on 21 February 2019 in Dan Sai, Thailand, and satellites saw it burning for 5 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 1,203 hectares from heat detections, spread across a single municipality.

It is the 87th largest in Loei Province since 2016 (of 113 with a page). Number 275 in Thailand in 2019, of 385.

The power measured by the satellite is low (16.0 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.

Compare with…

Suggestions: Botene · 2023 Botene · 2026 Botene · 2016 Botene · 2019

Burnt area: 1,203ha; GWIS perimeter (Copernicus)
Duration: 5days; 21 Feb 2019 – 25 Feb 2019
Municipalities hit: 1; districts
Started on: 21 Feb; 2019
Heat detections: 30; in a single hotspot: 16 MW
Danger at start: 13; Moderate · FWI index
Average daily power: 38MW; detected power per day, on average

HOTSPOTS BY DAY 21 Feb25 Feb

Play back 25 Feb 2019

How it evolved, day by day

21 Feb 23 Feb 24 Feb 25 Feb

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

The weather it burned in

34°high

31km/h · peak gust

31%lowest humidity

It had gone 3 days without rain (1 mm or more) when it started. Rain came after the fire: 1.9 mm on 26 Feb.

This area had burned before

26% of the perimeter overlaps earlier fires recorded since 2016: 135 ha in 2016, 211 ha in 2017. Part of it burned more than once, so the yearly figures add up to more than the 313 ha that had burned before.

How big is it?

It burned the equivalent of 0.8% of the area of London (12 km² against 1,583 km²).

London boundary: geoBoundaries · Office for National Statistics (Open Government Licence v3.0).

This compares size, not location: both shapes are at the same scale, north up, centred on each other.

What happened to each town

Dan Sai ด่านซ้าย where it started

1,143 ha

0.8 %

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.

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)
21 Feb	33.2 °C	40 %	22 km/h	0.0 mm	Moderate 13
22 Feb	33.7 °C	36 %	30 km/h	0.0 mm	Moderate 17
23 Feb	33.6 °C	33 %	31 km/h	0.0 mm	Moderate 18
24 Feb	34.1 °C	31 %	25 km/h	0.0 mm	Moderate 19
25 Feb	33.1 °C	41 %	24 km/h	0.0 mm	Moderate 18
26 Feb after	30.6 °C	54 %	24 km/h	1.9 mm	Very low 5

Before and after, from space

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

↔

Before · 14 Feb 2019

After · 4 Mar 2019

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.

Detections table · 30Every 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 Dan Sai fire last?: GWIS (Copernicus) dates it between 21 February 2019 and 25 February 2019: 5 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 1,203 hectares (12.0 km²). It is an estimate: official national figures may differ.
Which municipalities burned?: The fire only entered Dan Sai (1,143 ha, 0.8 %).
What was the weather like?: During the fire the temperature reached 34.1 °C, humidity dropped to 31 % and gusts hit 31 km/h. The fire danger index (FWI) reached 19, class Moderate.
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 · Emergency number and official warnings ›

Satellite cross-check

NASA FIRMS ↗
GWIS · Copernicus ↗

History of this page Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.

No changes since 24 October 2026.

RSS Changes to this page

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

What do you think is wrong?

Dates or duration Place or towns Burned area Name It was not a wildfire Same fire as another page Something else

What really happened?

Your connection to the fire (optional) Email (optional)

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.

How we know this

Perimeter: GWIS (Copernicus), rebuilt from heat detections rather than mapped on imagery.
Dates from the perimeter: the VIIRS detections inside it did not change them. 30 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.

How we build fire pages: methodology ›

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