How long did the Lanxi County fire last?

GWIS (Copernicus) dates it between 6 November 2025 and 7 November 2025: 2 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 3,037 hectares (30.4 km²). It is an estimate: official national figures may differ.

Which municipalities burned?

The fire only entered Lanxi County (3,027 ha, 1.2 %).

What was the weather like?

During the fire the temperature reached 10.3 °C, humidity dropped to 26 % and gusts hit 56 km/h. The fire danger index (FWI) reached 9, class Low.

Where does this data come from?

From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of China (geoBoundaries). It is not an official report.

CN · China · 2025-11-06 → 2025-11-07

Lanxi County fire, 6 November 2025 兰西县 · Lanxi County

Out · last detection 7 Nov 2025, 04:16 UTC

The fire started on 6 November 2025 in Lanxi County, China, and satellites saw it burning for 2 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 3,037 hectares from heat detections, spread across a single municipality.

It is the 325th largest in Heilongjiang Province since 2016 (of 1765 with a page). Number 151 in China in 2025, of 730.

Burnt area: 3,037ha; GWIS perimeter (Copernicus)
Duration: 2days; 6 Nov 2025 – 7 Nov 2025
Municipalities hit: 1; counties
Started on: 6 Nov; 2025
Heat detections: 108; in a single hotspot: 37 MW
Danger at start: 5; Very low · FWI index
Average daily power: 1.1GW; detected power per day, on average

HOTSPOTS BY DAY 6 Nov7 Nov

How it evolved, day by day

7 Nov 2025 · 1,088 MW · 108

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

The weather it burned in

10°high

56km/h · peak gust

26%lowest humidity

It had gone one day without rain (1 mm or more) when it started.

This area had burned before

63% of the perimeter overlaps earlier fires recorded since 2016: 583 ha in 2016, 855 ha in 2017, 1,504 ha in 2022. Part of it burned more than once, so the yearly figures add up to more than the 1,919 ha that had burned before.

1,103 ha Lanxi County fire, November 2022 1,220 ha in total; the hectares shown are those it shares with this fire

What happened to each town

Lanxi County 兰西县 where it started

3,027 ha

1.2 %

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)
31 Oct	9.4 °C	33 %	22 km/h	0.0 mm	Very low 5
1 Nov	4.1 °C	60 %	45 km/h	3.8 mm	Very low 0
2 Nov	0.8 °C	65 %	45 km/h	0.2 mm	Very low 1
3 Nov	6.0 °C	34 %	49 km/h	0.0 mm	Very low 3
4 Nov	10.3 °C	32 %	46 km/h	0.0 mm	Low 6
5 Nov	9.8 °C	61 %	33 km/h	3.0 mm	Very low 1
6 Nov	8.6 °C	39 %	37 km/h	0.0 mm	Very low 2
7 Nov	-0.5 °C	31 %	33 km/h	0.0 mm	Very low 3
8 Nov after	0.0 °C	55 %	31 km/h	0.7 mm	Very low 2
9 Nov after	2.8 °C	44 %	42 km/h	0.0 mm	Very low 4
10 Nov after	-1.3 °C	40 %	32 km/h	0.0 mm	Very low 4
11 Nov after	4.4 °C	36 %	29 km/h	0.0 mm	Very low 4
12 Nov after	8.7 °C	41 %	46 km/h	0.0 mm	Low 7
13 Nov after	2.0 °C	26 %	56 km/h	0.0 mm	Low 9
14 Nov after	1.4 °C	30 %	15 km/h	0.0 mm	Very low 4
15 Nov after	4.7 °C	32 %	40 km/h	0.0 mm	Low 7
16 Nov after	0.7 °C	33 %	45 km/h	0.0 mm	Low 8
17 Nov after	-4.7 °C	34 %	46 km/h	0.0 mm	Low 8
18 Nov after	-3.3 °C	41 %	31 km/h	0.0 mm	Low 5
19 Nov after	5.3 °C	35 %	46 km/h	0.0 mm	Low 8
20 Nov after	0.6 °C	37 %	42 km/h	0.0 mm	Low 7
21 Nov after	0.8 °C	39 %	35 km/h	0.2 mm	Low 6
22 Nov after	8.4 °C	27 %	45 km/h	0.0 mm	Low 9
23 Nov after	5.8 °C	33 %	29 km/h	0.0 mm	Low 7

Before and after, from space

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

↔

Before · 30 Oct 2025

After · 14 Nov 2025

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 5 November 2025 the air beside the fire reached 96 µg/m³ of PM2.5. That day averaged 68: 4.6 times the WHO daily guideline (15).

PM2.5 peak96 µg/m³

Days over the guideline7 days

PM10187 µg/m³

Optical depth1.55

WHO 15

45678910

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 · 108Every 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 China ›

Frequently asked questions

How long did the Lanxi County fire last?: GWIS (Copernicus) dates it between 6 November 2025 and 7 November 2025: 2 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 3,037 hectares (30.4 km²). It is an estimate: official national figures may differ.
Which municipalities burned?: The fire only entered Lanxi County (3,027 ha, 1.2 %).
What was the weather like?: During the fire the temperature reached 10.3 °C, humidity dropped to 26 % and gusts hit 56 km/h. The fire danger index (FWI) reached 9, class Low.
Where does this data come from?: From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of China (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: 119

Satellite cross-check

NASA FIRMS ↗
GWIS · Copernicus ↗

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 really happened?

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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 119.

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 ADM3 (Open Data Commons Open Database License 1.0). 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