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Chaos Fire, July 2021 Lane

Out · last detection 25 Sept 2021, 21:07 UTC

The fire started on 27 July 2021 in Lane, United States, and satellites saw it burning for 61 days. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 12,009 hectares, spread across a single county.

It is the 65th largest in Oregon since 2016 (of 327 with a page). Number 45 in United States in 2021, of 385.

Compare with…

Suggestions: Little Bend Creek · 2021Fuller Lake · 2024Staley · 2017Archie Creek · 2020

Burnt area
12,009ha
official perimeter (MTBS / NIFC)
Duration
≈ 61days
27 Jul 2021 – 25 Sept 2021
Counties hit
1
counties
Started on
27 Jul
2021
Heat detections
2,153
in a single hotspot: 234 MW
Danger at start
28
High · FWI index
Average daily power
183MW
detected power per day, on average

Where it burned

HOTSPOTS BY DAY 27 Jul25 Sept
25 Sept 2021

How it evolved, day by day

1 Aug 2021 · 8 MW · 4 2 Aug 2021 · 73 MW · 11 3 Aug 2021 · 38 MW · 17 4 Aug 2021 · 14 MW · 3 5 Aug 2021 · 30 MW · 19 6 Aug 2021 · 22 MW · 12 7 Aug 2021 · 42 MW · 20 8 Aug 2021 · 43 MW · 13 9 Aug 2021 · 38 MW · 19 10 Aug 2021 · 90 MW · 29 11 Aug 2021 · 158 MW · 52 12 Aug 2021 · 238 MW · 86 13 Aug 2021 · 140 MW · 52 14 Aug 2021 · 28 MW · 11 15 Aug 2021 · 82 MW · 11 16 Aug 2021 · 98 MW · 34 17 Aug 2021 · 18 MW · 9 18 Aug 2021 · 213 MW · 40 19 Aug 2021 · 612 MW · 91 20 Aug 2021 · 84 MW · 46 21 Aug 2021 · 39 MW · 11 22 Aug 2021 · 322 MW · 86 23 Aug 2021 · 127 MW · 67 24 Aug 2021 · 165 MW · 68 25 Aug 2021 · 68 MW · 35 26 Aug 2021 · 256 MW · 29 27 Aug 2021 · 456 MW · 26 28 Aug 2021 · 536 MW · 128 29 Aug 2021 · 399 MW · 106 30 Aug 2021 · 160 MW · 70 31 Aug 2021 · 311 MW · 44 1 Sept 2021 · 101 MW · 49 2 Sept 2021 · 369 MW · 110 3 Sept 2021 · 333 MW · 94 4 Sept 2021 · 194 MW · 67 5 Sept 2021 · 317 MW · 78 6 Sept 2021 · 184 MW · 51 7 Sept 2021 · 315 MW · 73 8 Sept 2021 · 533 MW · 101 9 Sept 2021 · 133 MW · 50 11 Sept 2021 · 103 MW · 4 12 Sept 2021 · 7 MW · 10 13 Sept 2021 · 52 MW · 24 14 Sept 2021 · 109 MW · 36 15 Sept 2021 · 235 MW · 41 16 Sept 2021 · 270 MW · 65 17 Sept 2021 · 621 MW · 50 25 Sept 2021 · 3 MW · 1
1 Aug 8 Aug 15 Aug 22 Aug 29 Aug 5 Sept 13 Sept 17 Sept

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
62km/h · peak gust
13%lowest humidity

It had gone 41 days without rain (1 mm or more) when it started. Rain came after the fire: 34.6 mm on 27 Sept.

This area had burned before

No earlier perimeters overlap this fire since 2016, when the satellite record begins.

How big is it?

10 km
It burned the equivalent of 7.6% of the area of London (120 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 county

  1. Lane where it started
    11,966 ha reached on 1 Aug
    1.0 %

Burnt area inside each county, from crossing the official 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 area< 0.1 ha
Residents< 20

Inside the perimeter there was no noticeable 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)
27 Jul 24.7 °C 35 % 34 km/h 0.0 mm High 28
28 Jul 31.1 °C 24 % 36 km/h 0.0 mm High 33
29 Jul 32.4 °C 21 % 38 km/h 0.5 mm High 36
30 Jul 28.4 °C 30 % 36 km/h 0.0 mm High 34
31 Jul 27.9 °C 36 % 34 km/h 0.4 mm High 29
1 Aug 30.8 °C 22 % 38 km/h 0.0 mm High 35
2 Aug 29.8 °C 28 % 41 km/h 0.0 mm High 36
3 Aug 28.8 °C 29 % 39 km/h 0.0 mm High 35
4 Aug 30.6 °C 21 % 41 km/h 0.0 mm High 37
5 Aug 21.8 °C 45 % 45 km/h 1.0 mm Moderate 17
6 Aug 27.2 °C 26 % 39 km/h 0.0 mm High 28
7 Aug 27.9 °C 34 % 46 km/h 0.4 mm High 30
8 Aug 22.5 °C 27 % 45 km/h 2.1 mm Moderate 12
9 Aug 27.2 °C 23 % 42 km/h 0.0 mm High 29
10 Aug 30.8 °C 19 % 39 km/h 0.0 mm High 35
11 Aug 34.9 °C 16 % 35 km/h 0.0 mm Very high 40
12 Aug 33.9 °C 23 % 40 km/h 0.0 mm Very high 42
13 Aug 30.2 °C 31 % 38 km/h 0.4 mm High 36
14 Aug 31.4 °C 27 % 39 km/h 0.0 mm High 35
15 Aug 31.4 °C 27 % 38 km/h 0.0 mm High 35
16 Aug 27.1 °C 27 % 45 km/h 0.0 mm High 37
17 Aug 16.8 °C 40 % 42 km/h 1.3 mm Moderate 14
18 Aug 22.6 °C 33 % 45 km/h 0.0 mm High 23
19 Aug 24.3 °C 34 % 46 km/h 0.0 mm High 26
20 Aug 21.2 °C 38 % 41 km/h 0.0 mm High 27
21 Aug 19.2 °C 38 % 34 km/h 0.7 mm Moderate 19
22 Aug 20.4 °C 38 % 38 km/h 0.0 mm High 22
23 Aug 20.9 °C 22 % 41 km/h 0.0 mm High 29
24 Aug 23.5 °C 24 % 37 km/h 0.0 mm High 29
25 Aug 22.2 °C 31 % 38 km/h 0.1 mm High 30
26 Aug 23.5 °C 31 % 41 km/h 0.0 mm High 30
27 Aug 21.9 °C 34 % 41 km/h 0.4 mm High 32
28 Aug 27.4 °C 20 % 45 km/h 0.0 mm High 37
29 Aug 26.5 °C 25 % 39 km/h 0.0 mm High 35
30 Aug 20.2 °C 33 % 38 km/h 0.0 mm High 30
31 Aug 19.8 °C 26 % 41 km/h 0.0 mm High 32
1 Sept 21.7 °C 22 % 42 km/h 0.0 mm High 32
2 Sept 23.7 °C 18 % 40 km/h 0.0 mm High 35
3 Sept 25.3 °C 19 % 38 km/h 0.0 mm High 36
4 Sept 27.7 °C 13 % 34 km/h 0.0 mm Very high 39
5 Sept 27.1 °C 24 % 36 km/h 0.0 mm High 37
6 Sept 27.6 °C 28 % 34 km/h 0.0 mm High 35
7 Sept 28.7 °C 24 % 42 km/h 0.0 mm High 38
8 Sept 27.9 °C 22 % 38 km/h 0.1 mm High 36
9 Sept 24.1 °C 38 % 35 km/h 0.2 mm High 30
10 Sept 16.8 °C 70 % 30 km/h 8.7 mm Very low 0
11 Sept 23.6 °C 24 % 32 km/h 0.0 mm Low 8
12 Sept 21.8 °C 40 % 41 km/h 0.0 mm Moderate 16
13 Sept 20.6 °C 28 % 41 km/h 0.0 mm High 22
14 Sept 24.7 °C 21 % 38 km/h 0.0 mm High 29
15 Sept 20.6 °C 30 % 42 km/h 0.0 mm High 30
16 Sept 22.9 °C 18 % 38 km/h 0.0 mm High 31
17 Sept 24.4 °C 15 % 44 km/h 0.0 mm High 35
18 Sept 14.5 °C 46 % 62 km/h 51.4 mm Very low 0
19 Sept 12.8 °C 63 % 56 km/h 20.0 mm Very low 0
20 Sept 20.8 °C 36 % 29 km/h 0.0 mm Very low 1
21 Sept 25.8 °C 21 % 33 km/h 0.0 mm Low 9
22 Sept 19.6 °C 46 % 37 km/h 0.0 mm Low 9
23 Sept 22.9 °C 39 % 33 km/h 0.0 mm Low 11
24 Sept 27.5 °C 25 % 32 km/h 0.0 mm Moderate 17
25 Sept 23.0 °C 39 % 32 km/h 0.0 mm Moderate 15
26 Sept after 20.9 °C 34 % 42 km/h 0.0 mm Moderate 16
27 Sept after 14.1 °C 62 % 48 km/h 34.6 mm Very low 0

Before and after, from space

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

Before · 20 Jul 2021
After · 2 Oct 2021

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 · 2,153Every 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 timeSatelliteFRP (MW)LatLon

Other fires nearby

All fires in United States ›

Frequently asked questions

How long did the Chaos Fire last?
The official perimeter only gives the start date (27 July 2021). The end comes from the heat detections inside the perimeter: it burned until 25 September 2021 (61 days from 27 July 2021), the last day with detections before more than 10 days in a row without any, so it is approximate.
How much area did it burn?
The official perimeter published by United States agencies (MTBS / NIFC) is 12,009 hectares (120.1 km²). Other tallies, such as daily incident reports, may give slightly different figures.
Which counties burned?
The fire only entered Lane (11,966 ha, 1.0 %).
What was the weather like?
During the fire the temperature reached 34.9 °C, humidity dropped to 13 % and gusts hit 62 km/h. The fire danger index (FWI) reached 42, class Very high.
Where does this data come from?
From the official burnt perimeter of United States agencies (MTBS / NIFC, public domain), NASA FIRMS VIIRS hotspots and the administrative boundaries of United States. 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: 911 · Emergency number and official warnings ›

Satellite cross-check

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

No changes since 24 October 2026.

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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How we know this
  • Perimeter: MTBS (US Geological Survey and US Forest Service), official.
  • The official perimeter has no end date: the end is the last day with VIIRS detections inside the perimeter before a gap of more than 10 days (150 days at most), so it is approximate. 2,153 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 is official and in the public domain. For past years it comes from MTBS (Monitoring Trends in Burn Severity), run by the U.S. Geological Survey and the USDA Forest Service, which map it on Landsat and Sentinel-2 imagery. For the current and last year it comes from WFIGS at the National Interagency Fire Center (NIFC): incident perimeters mapped by fire crews, aircraft and imagery. Heat detections come from the VIIRS sensors aboard Suomi-NPP and NOAA-20, distributed by NASA FIRMS at 375 m resolution. County boundaries come from geoBoundaries ADM2 (Public Domain). The area per county is computed by WorldFires by crossing the perimeter with those boundaries, so it may differ slightly from official figures.