How long did the Na Noi fire last?

According to the heat detections seen by satellite inside the perimeter, it burned from 19 March 2026 to 22 April 2026 (35 days). The perimeter dates it from 26 March 2026 to 22 April 2026.

How much area did it burn?

The perimeter GWIS (Copernicus) rebuilt from heat detections is 41,845 hectares (418.4 km²). It is an estimate: official national figures may differ.

Which municipalities burned?

The fire entered 4 municipalities: Wiang Sa (21,462 ha, 10 %); Mae Charim (9,717 ha, 9.3 %); Na Noi (4,026 ha, 3.3 %); Ban Khok (1,533 ha, 1.5 %).

What was the weather like?

During the fire the temperature reached 39.2 °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.

TH · Thailand · 19 Mar 2026 – 22 Apr 2026

Na Noi fire, 19 March 2026 นาน้อย · Wiang Sa, Mae Charim, Na Noi

Out · last detection 22 Apr 2026, 07:22 UTC

The fire started on 19 March 2026 in Na Noi, Thailand, and satellites saw it burning for 35 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 41,845 hectares from heat detections, spread across 4 municipalities.

Number 12 in Thailand in 2026, of 688.

GWIS near-real-time perimeter, from the layer that changed in October 2025: this fire is not compared with fires from earlier years, because since then the GWIS layer gives more and larger perimeters.

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Compare with…

Suggestions: Wiang Sa · 2019 Wiang Sa · 2023 Wiang Sa · 2024 Mae Charim · 2019

Use this data

Fire page data · version 2026-11-05

matches the official recordwith caveatssatellite onlymodel

When copying, the sentence is

Tick the figures you want: they make up the lede and the CSV.

Burned area

satellite only

41,845ha

Union of 7 GWIS (Copernicus) perimeters: overlapping areas count once.

Source: GWIS (Copernicus)
Date: 19 Mar 2026 – 22 Apr 2026

+ cross-check

No official record is matched to this page to compare it with.

in my selection

Duration by satellite

satellite only

35days

19 Mar 2026 to 22 Apr 2026: first and last day with fire on the page.

Source: GWIS (Copernicus) · NASA FIRMS · VIIRS
Date: last detection: 22 Apr 2026, 07:22 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.

in my selection

Start

satellite only

19 Mar 2026

First day with fire seen by the satellites or the perimeter.

Source: GWIS (Copernicus) · NASA FIRMS · VIIRS
Date: 19 Mar 2026

+ cross-check

No official record is matched to this page, so the alert time and the cause are not known here.

in my selection

Hotspots

satellite only

1,322

VIIRS detections at 375 m. Most intense hotspot: 36 MW.

Source: NASA FIRMS · VIIRS (Suomi NPP)
Date: 19 Mar 2026 – 22 Apr 2026

+ cross-check

There is no official record to compare with. Each hotspot is a pixel detected in one satellite pass, not a separate fire.

in my selection

The worst day

satellite only

491MW

Total radiative power on 13 April 2026; hotspots that day: 126.

Source: NASA FIRMS · VIIRS (FRP)
Date: 13 Apr 2026

+ 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.

in my selection

Danger at the start

model

25.2FWI · high

Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 6.

Source: WorldFires calculation (Canadian FWI system)
Date: 19 Mar 2026, 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

in my selection

Weather during the fire

model

39.2°C · 18% RH

High of 39.2 °C and minimum humidity of 18% on 16 April 2026; gusts of 44 km/h on 9 April 2026.

Source: weather model at the fire’s grid cell
Date: 19 Mar 2026 – 22 Apr 2026
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.

in my selection

Living inside

model

≈ 400people

Estimated residents inside the perimeter and 4.0 ha of built-up area (100 m grid, epoch 2025).

Source: GHSL R2023A · JRC
Date: calculated on 24 October 2026

+ cross-check

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.

in my selection

Versioned permanent link

https://worldfires.org/en/fire/na-noi-2026-03-4?v=2026-11-05

A 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

In another language

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CSV for this fire na-noi-2026-03-4.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
2026-03-19	0	0	34.9	18.9	30	8.7	26.3	0	25.2	alto	1
2026-03-20	4	7	35.4	20.2	31	7.5	27	0	24.9	alto	1
2026-03-21	0	0	34.6	20.6	37	9.4	28.4	0	26.6	alto	1
2026-03-22	0	0	34.4	21.3	39	11.5	33.8	0.5	28	alto	1
2026-03-23	3	7	35.9	21.6	26	11.7	35.6	0	31.3	alto	1
2026-03-24	10	33	36.6	20.2	25	10.5	33.5	0	31.9	alto	1
2026-03-25	12	42	37	21.6	29	11.1	33.1	0	32.9	alto	1
2026-03-26	0	0	37.4	21.6	27	11.2	34.9	0	33.5	alto	1
2026-03-27	7	17	37	21.9	29	13.2	39.6	0.1	35.6	alto	1
2026-03-28	16	53	36.6	22.5	31	11.8	34.9	0.2	34.9	alto	1
2026-03-29	41	109	36.1	22.3	30	13.6	40.7	0.1	36.9	alto	1
2026-03-30	8	22	36.5	22.1	28	13.1	39.2	0	36.9	alto	1
2026-03-31	3	5	36.2	22.6	32	11.8	35.6	0	35.7	alto	1
2026-04-01	5	14	37	22.1	31	9.3	30.6	0	34	alto	1
2026-04-02	21	57	37.5	23	29	12.2	34.2	0	36.9	alto	1
2026-04-03	92	281	36.9	22.7	31	11.9	37.1	0	37	alto	1
2026-04-04	33	51	35.8	22.8	36	10.9	35.6	0	33.5	alto	1
2026-04-05	6	23	36.6	23.6	34	12.4	37.4	0	35.1	alto	1
2026-04-06	16	63	37.5	23.6	30	11	35.3	0	34.3	alto	1
2026-04-07	11	33	37.4	23.3	31	12.2	35.6	0	35.6	alto	1
2026-04-08	91	327	37.9	23	25	13.6	40.3	0	38.9	muy_alto	1
2026-04-09	139	424	37.6	21.8	23	14.2	43.9	0	40.9	muy_alto	1
2026-04-10	105	264	37.9	21.3	21	13.6	42.5	0	42.2	muy_alto	1
2026-04-11	37	134	37.2	21.8	28	14.7	43.2	0	43.6	muy_alto	1
2026-04-12	43	126	37.6	22	24	10.9	32.8	0	40.2	muy_alto	1
2026-04-13	126	491	38	23	25	11.9	36.4	0	41.4	muy_alto	1
2026-04-14	136	318	38.4	22.6	25	10.6	32.8	0	40.5	muy_alto	1
2026-04-15	114	406	38.9	23.1	21	14.7	41.4	0	44.9	muy_alto	1
2026-04-16	74	223	39.2	21.6	18	12	36	0	44.5	muy_alto	1
2026-04-17	28	94	38.5	21.9	23	9.3	31	0	42	muy_alto	1
2026-04-18	46	207	37.1	23.3	33	9.6	27.4	0	36.9	alto	1
2026-04-19	62	142	36.2	23.2	37	12.2	37.4	0.2	36	alto	1
2026-04-20	30	92	36.9	23.2	32	11.8	37.1	0	35.8	alto	1
2026-04-21	2	3	37.6	23.4	28	11.2	34.6	0.1	35.9	alto	1
2026-04-22	1	5	37.9	24.8	35	10.2	33.8	0	35.2	alto	1
2026-04-23	0	0	36.1	24.4	42	10.1	36	0.5	31.6	alto	0
2026-04-24	0	0	34.7	22	48	12.9	31.7	4.5	8.6	bajo	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: 41,845ha; GWIS perimeter (Copernicus)
Duration: 35days; 19 Mar 2026 – 22 Apr 2026
Municipalities hit: 4; districts
Started on: 19 Mar; 2026
Heat detections: 1,322; in a single hotspot: 36 MW
Danger at start: 25; High · FWI index
Average daily power: 131MW; detected power per day, on average

HOTSPOTS BY DAY 19 Mar22 Apr

Play back 22 Apr 2026

How it evolved, day by day

20 Mar 30 Mar 6 Apr 13 Apr 20 Apr

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

Fire front film How it spread from one satellite pass to the next (62 passes) and with what wind. Watch the film

The weather it burned in

39°high

44km/h · peak gust

18%lowest humidity

It had gone 6 days without rain (1 mm or more) when it started. Rain came after the fire: 4.5 mm on 24 Apr.

This area had burned before

76% of the perimeter overlaps earlier fires recorded since 2016: 9,425 ha in 2016, 5,222 ha in 2017, 3,482 ha in 2018, 9,680 ha in 2019, 11,993 ha in 2020, 653 ha in 2021, 1,024 ha in 2022, 15,085 ha in 2023, 9,070 ha in 2024, 1,956 ha in 2025. Part of it burned more than once, so the yearly figures add up to more than the 31,599 ha that had burned before.

How big is it?

It burned the equivalent of 26% of the area of London (418 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

Wiang Sa เวียงสา

21,462 ha reached on 25 Mar

10 %
Mae Charim แม่จริม

9,717 ha reached on 27 Mar

9.3 %
Na Noi นาน้อย where it started

4,026 ha reached on 20 Mar

3.3 %
Ban Khok บ้านโคก

1,533 ha reached on 28 Mar

1.5 %

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 2025

Built-up area4.0 ha

Residents≈ 400

Inside the perimeter there were about 4.0 hectares of built-up land and about 400 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)
19 Mar	34.9 °C	30 %	26 km/h	0.0 mm	High 25
20 Mar	35.4 °C	31 %	27 km/h	0.0 mm	High 25
21 Mar	34.6 °C	37 %	28 km/h	0.0 mm	High 27
22 Mar	34.4 °C	39 %	34 km/h	0.5 mm	High 28
23 Mar	35.9 °C	26 %	36 km/h	0.0 mm	High 31
24 Mar	36.6 °C	25 %	34 km/h	0.0 mm	High 32
25 Mar	37.0 °C	29 %	33 km/h	0.0 mm	High 33
26 Mar	37.4 °C	27 %	35 km/h	0.0 mm	High 34
27 Mar	37.0 °C	29 %	40 km/h	0.1 mm	High 36
28 Mar	36.6 °C	31 %	35 km/h	0.2 mm	High 35
29 Mar	36.1 °C	30 %	41 km/h	0.1 mm	High 37
30 Mar	36.5 °C	28 %	39 km/h	0.0 mm	High 37
31 Mar	36.2 °C	32 %	36 km/h	0.0 mm	High 36
1 Apr	37.0 °C	31 %	31 km/h	0.0 mm	High 34
2 Apr	37.5 °C	29 %	34 km/h	0.0 mm	High 37
3 Apr	36.9 °C	31 %	37 km/h	0.0 mm	High 37
4 Apr	35.8 °C	36 %	36 km/h	0.0 mm	High 34
5 Apr	36.6 °C	34 %	37 km/h	0.0 mm	High 35
6 Apr	37.5 °C	30 %	35 km/h	0.0 mm	High 34
7 Apr	37.4 °C	31 %	36 km/h	0.0 mm	High 36
8 Apr	37.9 °C	25 %	40 km/h	0.0 mm	Very high 39
9 Apr	37.6 °C	23 %	44 km/h	0.0 mm	Very high 41
10 Apr	37.9 °C	21 %	42 km/h	0.0 mm	Very high 42
11 Apr	37.2 °C	28 %	43 km/h	0.0 mm	Very high 44
12 Apr	37.6 °C	24 %	33 km/h	0.0 mm	Very high 40
13 Apr	38.0 °C	25 %	36 km/h	0.0 mm	Very high 41
14 Apr	38.4 °C	25 %	33 km/h	0.0 mm	Very high 40
15 Apr	38.9 °C	21 %	41 km/h	0.0 mm	Very high 45
16 Apr	39.2 °C	18 %	36 km/h	0.0 mm	Very high 44
17 Apr	38.5 °C	23 %	31 km/h	0.0 mm	Very high 42
18 Apr	37.1 °C	33 %	27 km/h	0.0 mm	High 37
19 Apr	36.2 °C	37 %	37 km/h	0.2 mm	High 36
20 Apr	36.9 °C	32 %	37 km/h	0.0 mm	High 36
21 Apr	37.6 °C	28 %	35 km/h	0.1 mm	High 36
22 Apr	37.9 °C	35 %	34 km/h	0.0 mm	High 35
23 Apr after	36.1 °C	42 %	36 km/h	0.5 mm	High 32
24 Apr after	34.7 °C	48 %	32 km/h	4.5 mm	Low 9

Before and after, from space

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

↔

Before · 12 Mar 2026

After · 29 Apr 2026

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 18 April 2026 the air beside the fire reached 162 µg/m³ of PM2.5. That day averaged 101: 6.7 times the WHO daily guideline (15).

PM2.5 peak162 µg/m³

Days over the guideline33 days

PM10187 µg/m³

Optical depth2.28

WHO 15

24 Mar31 Mar7 Apr14 Apr21 Apr

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 · 1,322Every 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 Na Noi fire last?: According to the heat detections seen by satellite inside the perimeter, it burned from 19 March 2026 to 22 April 2026 (35 days). The perimeter dates it from 26 March 2026 to 22 April 2026.
How much area did it burn?: The perimeter GWIS (Copernicus) rebuilt from heat detections is 41,845 hectares (418.4 km²). It is an estimate: official national figures may differ.
Which municipalities burned?: The fire entered 4 municipalities: Wiang Sa (21,462 ha, 10 %); Mae Charim (9,717 ha, 9.3 %); Na Noi (4,026 ha, 3.3 %); Ban Khok (1,533 ha, 1.5 %).
What was the weather like?: During the fire the temperature reached 39.2 °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

NASA FIRMS ↗
GWIS · Copernicus ↗

History of this page · 2 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.

5 November 2026 Area: 43,391 → 41,845 ha.
27 October 2026 Start date: 26 March 2026 → 19 March 2026.

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

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; 7 polygons grouped in this page.
Dates adjusted with the VIIRS detections inside the perimeter, which said 26 March 2026 to 22 April 2026. 1,322 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.

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.

Use this data

Burned area

Duration by satellite

Start

Hotspots

The worst day

Danger at the start

Weather during the fire

Living inside

Area logged each night

Versioned permanent link

Citation

A lede of about 60 words figures only, no adjectives

CSV for this fire na-noi-2026-03-4.csv · daily, no individual hotspots

Live widget for your story

Where it burned

How it evolved, day by day

The weather it burned in

This area had burned before

How big is it?

What happened to each town

People and buildings inside the perimeter

The weather day by day

Before and after, from space

The smoke

Other fires nearby

Frequently asked questions

Where to verify it

Does something look wrong on this page?

Where this data comes from