Khlong Lan fire, 2 April 2023 Khlong Lan
The fire started on 2 April 2023 in Khlong Lan, Thailand, and satellites saw it burning for 6 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 1,404 hectares from heat detections, spread across a single municipality.
It is the 41th largest in Kamphaeng Phet Province since 2016 (of 66 with a page). Number 292 in Thailand in 2023, of 500.
The power measured by the satellite is low (8.2 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
- 1,404ha
- GWIS perimeter (Copernicus)
- Duration
- 6days
- 2 Apr 2023 – 7 Apr 2023
- Municipalities hit
- 1
- districts
- Started on
- 2 Apr
- 2023
- Heat detections
- 50
- in a single hotspot: 8 MW
- Danger at start
- 14
- Moderate · FWI index
- Energy released
- 103MW
- 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 6 days without rain (1 mm or more) when it started.
This area had burned before
74% of the perimeter overlaps earlier fires recorded since 2016: 514 ha in 2016, 812 ha in 2019, 471 ha in 2020, 50 ha in 2021. Part of it burned more than once, so the yearly figures add up to more than the 1,039 ha that had burned before.
- 269 ha Khlong Lan fire, April 2019 1,314 ha in total; the hectares shown are those it shares with this fire
- 241 ha Khlong Lan fire, March 2016 13,720 ha in total; the hectares shown are those it shares with this fire
- 23 ha Khlong Lan fire, March 2020 3,813 ha in total; the hectares shown are those it shares with this fire
- 10 ha Khlong Lan fire, March 2019 1,091 ha in total; the hectares shown are those it shares with this fire
What happened to each town
-
Khlong Lan where it started1,412 ha reached on 2 Apr1.0 %
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) |
|---|---|---|---|---|---|
| 26 Mar | 32.8 °C | 32 % | 38 km/h | 0.0 mm | Moderate 14 |
| 27 Mar | 34.2 °C | 26 % | 22 km/h | 0.0 mm | Moderate 15 |
| 28 Mar | 33.9 °C | 35 % | 18 km/h | 0.0 mm | Moderate 16 |
| 29 Mar | 32.5 °C | 36 % | 38 km/h | 0.2 mm | Moderate 18 |
| 30 Mar | 33.2 °C | 34 % | 41 km/h | 0.0 mm | Moderate 20 |
| 31 Mar | 32.9 °C | 34 % | 31 km/h | 0.0 mm | Moderate 18 |
| 1 Apr | 33.6 °C | 35 % | 20 km/h | 0.0 mm | Moderate 18 |
| 2 Apr | 31.7 °C | 41 % | 41 km/h | 0.2 mm | Moderate 20 |
| 3 Apr | 32.9 °C | 32 % | 48 km/h | 0.0 mm | High 22 |
| 4 Apr | 32.2 °C | 40 % | 48 km/h | 0.0 mm | High 22 |
| 5 Apr | 33.4 °C | 34 % | 26 km/h | 0.0 mm | Moderate 20 |
| 6 Apr | 34.9 °C | 36 % | 18 km/h | 0.0 mm | Moderate 19 |
| 7 Apr | 33.0 °C | 42 % | 17 km/h | 0.0 mm | Moderate 19 |
| 8 Apr after | 33.1 °C | 38 % | 23 km/h | 0.0 mm | Moderate 20 |
| 9 Apr after | 34.1 °C | 34 % | 18 km/h | 0.0 mm | Moderate 20 |
| 10 Apr after | 34.9 °C | 33 % | 21 km/h | 0.0 mm | Moderate 21 |
| 11 Apr after | 35.3 °C | 31 % | 23 km/h | 0.0 mm | High 23 |
| 12 Apr after | 35.7 °C | 35 % | 21 km/h | 0.0 mm | High 24 |
| 13 Apr after | 34.8 °C | 37 % | 22 km/h | 0.0 mm | High 25 |
| 14 Apr after | 35.9 °C | 29 % | 23 km/h | 0.0 mm | High 26 |
| 15 Apr after | 36.7 °C | 30 % | 19 km/h | 0.0 mm | High 26 |
| 16 Apr after | 35.1 °C | 35 % | 21 km/h | 0.0 mm | High 27 |
| 17 Apr after | 34.7 °C | 35 % | 26 km/h | 0.0 mm | High 27 |
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.
The smoke
CAMS · CopernicusOn 7 April 2023 the air beside the fire reached 68 µg/m³ of PM2.5. That day averaged 47: 3.1 times the WHO daily guideline (15).
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 · 50Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
- 50,877 haWang ChaoMarch 2026 · 33 days · 20 km away
- 19,313 haMae Wong23 March 2023 · 30 days · 27 km away
- 29,428 haUmphangFebruary 2026 · 15 days · 32 km away
- 26,711 haUmphangFebruary 2021 · 38 days · 33 km away
- 16,730 haUmphang11 March 2016 · 16 days · 36 km away
- 27,598 haUmphang6 March 2019 · 21 days · 37 km away
Frequently asked questions
- How long did the Khlong Lan fire last?
- GWIS (Copernicus) dates it between 2 April 2023 and 7 April 2023: 6 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 1,404 hectares (14.0 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Khlong Lan (1,412 ha, 1.0 %).
- What was the weather like?
- During the fire the temperature reached 34.9 °C, humidity dropped to 26 % and gusts hit 48 km/h. The fire danger index (FWI) reached 22, 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.