Na Noi fire, 12 March 2026 นาน้อย · Na Noi, Na Muen, Ban Khok
The fire started on 12 March 2026 in Na Noi, Thailand, and satellites saw it burning for 45 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 66,772 hectares from heat detections, spread across 6 municipalities.
This page is probably a fire complex, not a single fire. GWIS merges into one perimeter the fires that touch over weeks, which in large burning seasons can join dozens of separate fires. The total area is reliable; the origin and dates refer to the whole complex.
Other fire pages in the same area and on the same dates:
- 43,391 haNa Noi นาน้อย19 March 2026 · 35 days
- 29,026 haSong สอง15 March 2026 · 40 days
- 22,704 haFak Tha ฟากท่าMarch 2026 · 35 days
- 17,257 haTha Pla ท่าปลา18 March 2026 · 37 days
- 15,085 haWiang Sa เวียงสา17 March 2026 · 31 days
- 13,700 haTha Pla ท่าปลา14 March 2026 · 39 days
- 13,146 haNam Pat น้ำปาด18 March 2026 · 37 days
- 11,023 haNa Muen นาหมื่นApril 2026 · 21 days
It is the largest fire in Nan Province since 2016 (of 189 with a page). Number 4 in Thailand in 2026, of 689.
The power measured by the satellite is low (27.9 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: Na Noi · 2019Na Noi · 2025Na Noi · 2019Na Noi · 2025
- Burnt area
- 66,772ha
- GWIS perimeter (Copernicus)
- Duration
- 45days
- 12 Mar 2026 – 25 Apr 2026
- Municipalities hit
- 6
- districts
- Started on
- 12 Mar
- 2026
- Heat detections
- 2,029
- in a single hotspot: 28 MW
- Danger at start
- 12
- Moderate · FWI index
- Average daily power
- 164MW
- detected power per day, on average
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 13 days without rain (1 mm or more) when it started. Rain came after the fire: 2.1 mm on 26 Apr.
This area had burned before
72% of the perimeter overlaps earlier fires recorded since 2016: 10,854 ha in 2016, 12,493 ha in 2017, 4,068 ha in 2018, 15,003 ha in 2019, 8,493 ha in 2020, 8,295 ha in 2021, 108 ha in 2022, 12,401 ha in 2023, 14,564 ha in 2024, 16,616 ha in 2025. Part of it burned more than once, so the yearly figures add up to more than the 48,093 ha that had burned before.
- 4,960 ha Na Noi fire, February 2019 5,156 ha in total; the hectares shown are those it shares with this fire
- 2,236 ha Na Noi fire, March 2025 2,266 ha in total; the hectares shown are those it shares with this fire
- 1,846 ha Na Noi fire, February 2019 3,381 ha in total; the hectares shown are those it shares with this fire
- 1,803 ha Na Noi fire, March 2025 1,902 ha in total; the hectares shown are those it shares with this fire
- 1,442 ha Na Noi fire, March 2025 1,434 ha in total; the hectares shown are those it shares with this fire
- 1,347 ha Fak Tha fire, February 2020 1,430 ha in total; the hectares shown are those it shares with this fire
- 1,288 ha Ban Khok fire, March 2025 1,590 ha in total; the hectares shown are those it shares with this fire
- 1,186 ha Na Noi fire, March 2016 2,442 ha in total; the hectares shown are those it shares with this fire
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
-
32,663 ha reached on 13 Mar27 %
-
Na Muen นาหมื่น14,695 ha reached on 23 Mar17 %
-
Ban Khok บ้านโคก13,857 ha reached on 14 Mar14 %
-
Fak Tha ฟากท่า5,425 ha reached on 17 Mar8.4 %
-
Wiang Sa เวียงสา291 ha reached on 29 Mar0.1 %
-
Tha Pla ท่าปลา204 ha reached on 25 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 2025Inside the perimeter there were about 3.1 hectares of built-up land and about 200 residents (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) |
|---|---|---|---|---|---|
| 12 Mar | 31.3 °C | 41 % | 36 km/h | 1.7 mm | Moderate 12 |
| 13 Mar | 28.2 °C | 47 % | 39 km/h | 0.0 mm | Moderate 16 |
| 14 Mar | 30.2 °C | 43 % | 41 km/h | 0.0 mm | Moderate 19 |
| 15 Mar | 31.7 °C | 39 % | 36 km/h | 0.0 mm | Moderate 21 |
| 16 Mar | 31.2 °C | 42 % | 32 km/h | 0.0 mm | Moderate 20 |
| 17 Mar | 31.8 °C | 44 % | 27 km/h | 0.5 mm | Moderate 20 |
| 18 Mar | 34.2 °C | 33 % | 24 km/h | 0.0 mm | High 22 |
| 19 Mar | 35.1 °C | 31 % | 26 km/h | 0.0 mm | High 26 |
| 20 Mar | 35.6 °C | 31 % | 27 km/h | 0.0 mm | High 26 |
| 21 Mar | 34.8 °C | 37 % | 28 km/h | 0.0 mm | High 27 |
| 22 Mar | 34.6 °C | 39 % | 34 km/h | 0.5 mm | High 29 |
| 23 Mar | 36.1 °C | 26 % | 36 km/h | 0.0 mm | High 32 |
| 24 Mar | 36.8 °C | 25 % | 34 km/h | 0.0 mm | High 33 |
| 25 Mar | 37.2 °C | 29 % | 33 km/h | 0.0 mm | High 34 |
| 26 Mar | 37.6 °C | 27 % | 35 km/h | 0.0 mm | High 34 |
| 27 Mar | 37.2 °C | 29 % | 40 km/h | 0.1 mm | High 36 |
| 28 Mar | 36.8 °C | 31 % | 35 km/h | 0.2 mm | High 36 |
| 29 Mar | 36.3 °C | 30 % | 41 km/h | 0.1 mm | High 38 |
| 30 Mar | 36.7 °C | 28 % | 39 km/h | 0.0 mm | High 38 |
| 31 Mar | 36.4 °C | 32 % | 36 km/h | 0.0 mm | High 36 |
| 1 Apr | 37.2 °C | 31 % | 31 km/h | 0.0 mm | High 34 |
| 2 Apr | 37.7 °C | 29 % | 34 km/h | 0.0 mm | High 37 |
| 3 Apr | 37.1 °C | 31 % | 37 km/h | 0.0 mm | High 38 |
| 4 Apr | 36.0 °C | 36 % | 36 km/h | 0.0 mm | High 34 |
| 5 Apr | 36.8 °C | 34 % | 37 km/h | 0.0 mm | High 36 |
| 6 Apr | 37.7 °C | 30 % | 35 km/h | 0.0 mm | High 35 |
| 7 Apr | 37.6 °C | 31 % | 36 km/h | 0.0 mm | High 36 |
| 8 Apr | 38.1 °C | 26 % | 40 km/h | 0.0 mm | Very high 39 |
| 9 Apr | 37.8 °C | 23 % | 44 km/h | 0.0 mm | Very high 41 |
| 10 Apr | 38.1 °C | 21 % | 42 km/h | 0.0 mm | Very high 43 |
| 11 Apr | 37.4 °C | 28 % | 43 km/h | 0.0 mm | Very high 44 |
| 12 Apr | 37.8 °C | 24 % | 33 km/h | 0.0 mm | Very high 40 |
| 13 Apr | 38.2 °C | 25 % | 36 km/h | 0.0 mm | Very high 42 |
| 14 Apr | 38.6 °C | 26 % | 33 km/h | 0.0 mm | Very high 41 |
| 15 Apr | 39.1 °C | 21 % | 41 km/h | 0.0 mm | Very high 45 |
| 16 Apr | 39.4 °C | 18 % | 36 km/h | 0.0 mm | Very high 45 |
| 17 Apr | 38.7 °C | 23 % | 31 km/h | 0.0 mm | Very high 42 |
| 18 Apr | 37.3 °C | 33 % | 27 km/h | 0.0 mm | High 37 |
| 19 Apr | 36.4 °C | 37 % | 37 km/h | 0.2 mm | High 36 |
| 20 Apr | 37.1 °C | 32 % | 37 km/h | 0.0 mm | High 36 |
| 21 Apr | 37.8 °C | 28 % | 35 km/h | 0.1 mm | High 36 |
| 22 Apr | 38.1 °C | 35 % | 34 km/h | 0.0 mm | High 35 |
| 23 Apr | 36.3 °C | 42 % | 36 km/h | 0.5 mm | High 32 |
| 24 Apr | 34.9 °C | 48 % | 32 km/h | 4.5 mm | Low 9 |
| 25 Apr | 30.3 °C | 62 % | 31 km/h | 1.2 mm | Low 10 |
| 26 Apr after | 33.2 °C | 48 % | 33 km/h | 2.1 mm | Low 8 |
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 17 April 2026 the air beside the fire reached 119 µg/m³ of PM2.5. That day averaged 90: 6.0 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 · 2,029Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
Frequently asked questions
- How long did the Na Noi fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 12 March 2026 to 25 April 2026 (45 days). The perimeter dates it from 12 March 2026 to 22 April 2026.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 66,772 hectares (667.7 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 6 municipalities: Na Noi (32,663 ha, 27 %); Na Muen (14,695 ha, 17 %); Ban Khok (13,857 ha, 14 %); Fak Tha (5,425 ha, 8.4 %); Wiang Sa (291 ha, 0.1 %); Tha Pla (204 ha, 0.1 %).
- What was the weather like?
- During the fire the temperature reached 39.4 °C, humidity dropped to 18 % and gusts hit 44 km/h. The fire danger index (FWI) reached 45, 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 · 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: 22 April 2026 → 25 April 2026.
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; 13 polygons grouped in this page.
- Dates adjusted with the VIIRS detections inside the perimeter, which said 12 March 2026 to 22 April 2026. 2,029 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.