Burned area
satellite only1,006ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 20 Feb 2023 – 25 Feb 2023
+− cross-check
No official record is matched to this page to compare it with.
TH · Thailand · –
Phu Khiao fire, February 2023 ภูเขียว · Phu Khiao, Kaset Sombun
Out · last detection 23 Feb 2023, 06:12 UTC
The fire started on 20 February 2023 in Phu Khiao, Thailand, and satellites saw it burning for 6 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 1,006 hectares from heat detections, spread across 2 municipalities.
It is the 89th largest in Chaiyaphum Province since 2016 (of 90 with a page). Number 364 in Thailand in 2023, of 369.
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 only6days
20 Feb 2023 to 25 Feb 2023: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 23 Feb 2023, 06:12 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 only20 Feb 2023
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 20 Feb 2023
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only28
VIIRS detections at 375 m. Most intense hotspot: 106 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 20 Feb 2023 – 25 Feb 2023
+− 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 only492MW
Total radiative power on 21 February 2023; hotspots that day: 13.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 21 Feb 2023
+− 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
model26.6FWI · high
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 4.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 20 Feb 2023, 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
model31.5°C · 42% RH
High of 31.5 °C and minimum humidity of 42% on 24 February 2023; gusts of 47 km/h on 25 February 2023.
- Source
- weather model at the fire’s grid cell
- Date
- 20 Feb 2023 – 25 Feb 2023
- 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
-
logLast day with fire: 23 February 2023 → 25 February 2023.
-
· 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
- 1,006 ha
- Dates
- 20 Feb 2023 – 25 Feb 2023
- Name
- Phu Khiao
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/phu-khiao-2023-02?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 phu-khiao-2023-02.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023-02-20 | 3 | 5 | 28.8 | 18.9 | 47 | 14.1 | 37.8 | 0 | 26.6 | alto | 1 |
| 2023-02-21 | 13 | 492 | 29.3 | 17.2 | 46 | 11.8 | 33.5 | 0 | 24.7 | alto | 1 |
| 2023-02-22 | 10 | 64 | 29.1 | 17.1 | 48 | 14.8 | 35.3 | 0 | 27 | alto | 1 |
| 2023-02-23 | 2 | 14 | 30.1 | 17 | 47 | 8.7 | 27 | 0 | 22.5 | alto | 1 |
| 2023-02-24 | 0 | 0 | 31.5 | 19 | 42 | 15 | 36.4 | 0 | 25.5 | alto | 1 |
| 2023-02-25 | 0 | 0 | 28.3 | 18.8 | 45 | 19.8 | 47.2 | 0 | 35 | alto | 1 |
| 2023-02-26 | 0 | 0 | 26.3 | 16 | 41 | 20 | 51.5 | 0 | 35.7 | alto | 0 |
| 2023-02-27 | 0 | 0 | 26.5 | 14 | 39 | 14.8 | 38.9 | 0 | 30.8 | alto | 0 |
| 2023-02-28 | 0 | 0 | 28.9 | 14.9 | 44 | 13 | 35.3 | 0 | 29.4 | alto | 0 |
| 2023-03-01 | 0 | 0 | 31.5 | 15.6 | 38 | 12.5 | 33.8 | 0 | 30 | alto | 0 |
| 2023-03-02 | 0 | 0 | 29.8 | 16.6 | 41 | 15.6 | 41 | 0 | 33.1 | alto | 0 |
| 2023-03-03 | 0 | 0 | 29.1 | 16.5 | 40 | 12.5 | 35.3 | 0 | 30.4 | alto | 0 |
| 2023-03-04 | 0 | 0 | 28.6 | 17 | 44 | 15 | 41 | 0 | 33.2 | alto | 0 |
| 2023-03-05 | 0 | 0 | 28.2 | 16.9 | 48 | 14.8 | 37.4 | 0 | 33.2 | alto | 0 |
| 2023-03-06 | 0 | 0 | 28.9 | 17 | 46 | 11 | 31.7 | 0 | 29.4 | alto | 0 |
| 2023-03-07 | 0 | 0 | 31 | 16.7 | 41 | 8.6 | 26.3 | 0 | 27 | 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
- 1,006ha
- GWIS perimeter (Copernicus)
- Duration
- 6days
- 20 Feb 2023 – 25 Feb 2023
- Municipalities hit
- 2
- districts
- Started on
- 20 Feb
- 2023
- Heat detections
- 28
- in a single hotspot: 106 MW
- Danger at start
- 27
- High · FWI index
- Average daily power
- 144MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
20 Feb25 Feb
23 Feb 2023
How it evolved, day by day
20 Feb
21 Feb
22 Feb
23 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
32°high
47km/h · peak gust
42%lowest humidity
It had gone 4 days without rain (1 mm or more) when it started.
This area had burned before
50% of the perimeter overlaps earlier fires recorded since 2016: 379 ha in 2016, 133 ha in 2017, 523 ha in 2019, 4 ha in 2020, 21 ha in 2021. Part of it burned more than once, so the yearly figures add up to more than the 506 ha that had burned before.
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
-
996 ha reached on 20 Feb1.2 %
-
Kaset Sombun เกษตรสมบูรณ์16 ha0.0 %
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 2025Built-up area< 0.1 ha
Residents< 20
Inside the perimeter there was no noticeable built-up land and almost nobody lived there (GHSL 2025, 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. The GHSL 2025 epoch is a projection made from 2020 and earlier data.
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) |
|---|---|---|---|---|---|
| 20 Feb | 28.8 °C | 47 % | 38 km/h | 0.0 mm | High 27 |
| 21 Feb | 29.3 °C | 46 % | 34 km/h | 0.0 mm | High 25 |
| 22 Feb | 29.1 °C | 48 % | 35 km/h | 0.0 mm | High 27 |
| 23 Feb | 30.1 °C | 47 % | 27 km/h | 0.0 mm | High 22 |
| 24 Feb | 31.5 °C | 42 % | 36 km/h | 0.0 mm | High 26 |
| 25 Feb | 28.3 °C | 45 % | 47 km/h | 0.0 mm | High 35 |
| 26 Feb after | 26.3 °C | 41 % | 52 km/h | 0.0 mm | High 36 |
| 27 Feb after | 26.5 °C | 39 % | 39 km/h | 0.0 mm | High 31 |
| 28 Feb after | 28.9 °C | 44 % | 35 km/h | 0.0 mm | High 29 |
| 1 Mar after | 31.5 °C | 38 % | 34 km/h | 0.0 mm | High 30 |
| 2 Mar after | 29.8 °C | 41 % | 41 km/h | 0.0 mm | High 33 |
| 3 Mar after | 29.1 °C | 40 % | 35 km/h | 0.0 mm | High 30 |
| 4 Mar after | 28.6 °C | 44 % | 41 km/h | 0.0 mm | High 33 |
| 5 Mar after | 28.2 °C | 48 % | 37 km/h | 0.0 mm | High 33 |
| 6 Mar after | 28.9 °C | 46 % | 32 km/h | 0.0 mm | High 29 |
| 7 Mar after | 31.0 °C | 41 % | 26 km/h | 0.0 mm | High 27 |
Its twins: fires that started in the same weather
It started with an FWI of 26.6, a minimum humidity of 47% and 4 days without rain. Fires in the area that started in weather like this since 2016: 15.
FWI at the start
26.6
Minimum humidity
47 %
Days without rain
4
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Phu Khiao fire, February 2023
1,006 ha
6 days
FWI 26.6
Min. humidity 47 %
Khon Sawan fire, March 2019
11,561 ha
14 days
FWI 23.9
Min. humidity 48 %
31 km away, in 2019
First rain (1 mm or more) after it ended: 4.3 mm on 25 Mar.
Lom Sak fire, March 2025
3,223 ha
11 days
FWI 24.1
Min. humidity 46 %
92 km away, in 2025
First rain (1 mm or more) after it ended: 5.8 mm on 7 Apr.
Phu Kradueng fire, April 2023
2,775 ha
6 days
FWI 27.4
Min. humidity 44 %
74 km away, in 2023
First rain (1 mm or more) after it ended: 1.0 mm on 8 Apr.
Khon San fire, April 2023
1,065 ha
5 days
FWI 31.5
Min. humidity 47 %
58 km away, in 2023
First rain (1 mm or more) after it ended: 1.2 mm on 8 Apr.
Lom Sak fire, March 2023
1,291 ha
6 days
FWI 23.8
Min. humidity 48 %
98 km away, in 2023
First rain (1 mm or more) after it ended: none in the following ten days.
What happened to them
- 9 days
- median duration
- 1,442 ha
- median area
- 100 %
- went past 1,000 ha
- 1.8 mm
- rain at the end (median; 12 of 15 had it)
It burned an area similar to its twins (1,006 ha against a median of 1,442 ha) and lasted 6 days, against 9 days.
In 3 of 15, 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 1.8 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
47km/h · max. gust
It was considered over on 25 Feb, and not even 1 mm fell in the following ten days: it went out without rain. Twins with rain when they ended: 12 of 15, with a median of 1.8 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 · 13 Feb 2023
After · 4 Mar 2023
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.
The smoke
CAMS · CopernicusOn 24 February 2023 the air beside the fire reached 28 µg/m³ of PM2.5. That day averaged 20: 1.4 times the WHO daily guideline (15).
PM2.5 peak28 µg/m³
Days over the guideline8 days
PM1041 µg/m³
Optical depth0.55
WHO 15
18 Feb20 Feb22 Feb24 Feb26 Feb
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 · 28Every 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
- 4,290 haPhu Khiao ภูเขียว4 April 2026 · 9 days · 4 km away
- 3,813 haKaset Sombun เกษตรสมบูรณ์9 April 2026 · 9 days · 25 km away
- 11,561 haKhon Sawan คอนสวรรค์March 2019 · 14 days · 31 km away
- 4,174 haMueang Chaiyaphum เมืองชัยภูมิApril 2016 · 11 days · 34 km away
- 5,044 haKaset Sombun เกษตรสมบูรณ์2 April 2026 · 17 days · 35 km away
- 7,447 haNong Bua Daeng หนองบัวแดง3 February 2024 · 17 days · 39 km away
Frequently asked questions
- How long did the Phu Khiao fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 20 February 2023 to 25 February 2023 (6 days). The perimeter dates it from 20 February 2023 to 23 February 2023.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 1,006 hectares (10.1 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 2 municipalities: Phu Khiao (996 ha, 1.2 %); Kaset Sombun (16 ha, 0.0 %).
- What was the weather like?
- During the fire the temperature reached 31.5 °C, humidity dropped to 42 % and gusts hit 47 km/h. The fire danger index (FWI) reached 35, 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.
- 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: 15. Their median duration was 9 days and their median area 1,442 ha; 100 % went past 1,000 ha. In 3 of 15, 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 1.8 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.
- Last day with fire: 23 February 2023 → 25 February 2023.
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 20 February 2023 to 23 February 2023. 28 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 2025, 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.