How long did the Na Noi fire last?

According to the heat detections seen by satellite inside the perimeter, it burned from 23 February 2019 to 15 March 2019 (21 days). The perimeter dates it from 23 February 2019 to 10 March 2019.

How much area did it burn?

The perimeter GWIS (Copernicus) rebuilt from heat detections is 3,381 hectares (33.8 km²). It is an estimate: official national figures may differ.

Which municipalities burned?

The fire entered 2 municipalities: Na Noi (3,230 ha, 2.6 %); Na Muen (169 ha, 0.2 %).

What was the weather like?

During the fire the temperature reached 34.6 °C, humidity dropped to 22 % and gusts hit 47 km/h. The fire danger index (FWI) reached 37, 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.

TH · Thailand · 2019-02-23 → 2019-03-15

Na Noi fire, 23 February 2019 นาน้อย · Na Noi, Na Muen

Out · last detection 15 Mar 2019, 06:29 UTC

The fire started on 23 February 2019 in Na Noi, Thailand, and satellites saw it burning for 21 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 3,381 hectares from heat detections, spread across 2 municipalities.

It is the 25th largest in Nan Province since 2016 (of 189 with a page). Number 41 in Thailand in 2019, of 385.

The power measured by the satellite is low (17.8 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 · 2017 Na Noi · 2016 Na Noi · 2016 Na Noi · 2026

Burnt area: 3,381ha; GWIS perimeter (Copernicus)
Duration: 21days; 23 Feb 2019 – 15 Mar 2019
Municipalities hit: 2; districts
Started on: 23 Feb; 2019
Heat detections: 136; in a single hotspot: 18 MW
Danger at start: 21; Moderate · FWI index
Average daily power: 26MW; detected power per day, on average

HOTSPOTS BY DAY 23 Feb15 Mar

Play back 15 Mar 2019

How it evolved, day by day

23 Feb 26 Feb 1 Mar 4 Mar 7 Mar 10 Mar 15 Mar

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

The weather it burned in

35°high

47km/h · peak gust

22%lowest humidity

It had gone 4 days without rain (1 mm or more) when it started. Rain came after the fire: 2.2 mm on 19 Mar.

This area had burned before

71% of the perimeter overlaps earlier fires recorded since 2016: 1,553 ha in 2016, 2,077 ha in 2017, 17 ha in 2018. Part of it burned more than once, so the yearly figures add up to more than the 2,399 ha that had burned before.

How big is it?

It burned the equivalent of 2.1% of the area of London (34 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

Na Noi นาน้อย where it started

3,230 ha reached on 23 Feb

2.6 %
Na Muen นาหมื่น

169 ha reached on 8 Mar

0.2 %

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 2020

Built-up area0.19 ha

Residents< 20

Inside the perimeter there were about 0.19 hectares of built-up land and almost nobody lived there (GHSL 2020, 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.

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)
22 Feb	33.6 °C	28 %	34 km/h	0.0 mm	Moderate 21
23 Feb	34.0 °C	28 %	25 km/h	0.0 mm	Moderate 20
24 Feb	34.3 °C	24 %	28 km/h	0.0 mm	High 23
25 Feb	33.9 °C	31 %	31 km/h	0.0 mm	High 24
26 Feb	32.9 °C	33 %	28 km/h	0.0 mm	High 22
27 Feb	32.9 °C	36 %	25 km/h	0.1 mm	Moderate 20
28 Feb	32.2 °C	40 %	26 km/h	0.6 mm	Moderate 17
1 Mar	34.2 °C	29 %	28 km/h	0.0 mm	High 22
2 Mar	34.6 °C	27 %	37 km/h	0.0 mm	High 26
3 Mar	34.6 °C	24 %	34 km/h	0.0 mm	High 27
4 Mar	33.6 °C	27 %	43 km/h	0.0 mm	High 30
5 Mar	34.0 °C	23 %	39 km/h	0.0 mm	High 31
6 Mar	34.2 °C	22 %	36 km/h	0.0 mm	High 31
7 Mar	34.4 °C	26 %	34 km/h	0.0 mm	High 31
8 Mar	34.0 °C	28 %	45 km/h	0.0 mm	High 35
9 Mar	34.1 °C	28 %	47 km/h	0.0 mm	High 37
10 Mar	33.4 °C	24 %	35 km/h	0.0 mm	High 33
11 Mar	34.2 °C	19 %	28 km/h	0.0 mm	High 30
12 Mar	33.9 °C	25 %	32 km/h	0.0 mm	High 34
13 Mar	33.8 °C	28 %	32 km/h	0.0 mm	High 33
14 Mar	34.2 °C	28 %	25 km/h	0.0 mm	High 33
15 Mar	33.8 °C	32 %	24 km/h	0.0 mm	High 30
16 Mar after	33.5 °C	37 %	30 km/h	0.8 mm	High 23
17 Mar after	33.9 °C	37 %	27 km/h	0.0 mm	High 23
18 Mar after	34.2 °C	35 %	26 km/h	0.2 mm	High 24
19 Mar after	34.7 °C	33 %	39 km/h	2.2 mm	Moderate 17

Before and after, from space

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

↔

Before · 16 Feb 2019

After · 22 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 · 136Every 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 23 February 2019 to 15 March 2019 (21 days). The perimeter dates it from 23 February 2019 to 10 March 2019.
How much area did it burn?: The perimeter GWIS (Copernicus) rebuilt from heat detections is 3,381 hectares (33.8 km²). It is an estimate: official national figures may differ.
Which municipalities burned?: The fire entered 2 municipalities: Na Noi (3,230 ha, 2.6 %); Na Muen (169 ha, 0.2 %).
What was the weather like?: During the fire the temperature reached 34.6 °C, humidity dropped to 22 % and gusts hit 47 km/h. The fire danger index (FWI) reached 37, 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 · Emergency number and official warnings ›

Satellite cross-check

NASA FIRMS ↗
GWIS · Copernicus ↗

History of this page · 1 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.

26 October 2026 Last day with fire: 10 March 2019 → 15 March 2019.

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.

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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; 2 polygons grouped in this page.
Dates adjusted with the VIIRS detections inside the perimeter, which said 23 February 2019 to 10 March 2019. 136 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 2020, 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.

Where it burned