How long did the Ford Corkscrew Fire last?

The official perimeter only gives the start date (15 August 2021). The end comes from the heat detections inside the perimeter: it burned until 3 September 2021 (20 days from 15 August 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 6,542 hectares (65.4 km²). Other tallies, such as daily incident reports, may give slightly different figures.

Which counties burned?

The fire only entered Stevens (6,485 ha, 1.0 %).

What was the weather like?

During the fire the temperature reached 34.4 °C, humidity dropped to 14 % and gusts hit 52 km/h. The fire danger index (FWI) reached 52, class Extreme.

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.

US · United States · 2021-08-15 → 2021-09-03

Ford Corkscrew Fire, August 2021 Stevens

Out · last detection 3 Sept 2021, 09:53 UTC

The fire started on 15 August 2021 in Stevens, United States, and satellites saw it burning for 20 days. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 6,542 hectares, spread across a single county.

It is the 56th largest in Washington since 2016 (of 285 with a page). Number 74 in United States in 2021, of 385.

Compare with…

Suggestions: Lake Spokane · 2025 Autumn Lane · 2026 Cayuse Mtn · 2016 Old Trails · 2026

Burnt area: 6,542ha; official perimeter (MTBS / NIFC)
Duration: ≈ 20days; 15 Aug 2021 – 3 Sept 2021
Counties hit: 1; counties
Started on: 15 Aug; 2021
Heat detections: 369; in a single hotspot: 248 MW
Danger at start: 52; Extreme · FWI index
Average daily power: 563MW; detected power per day, on average

HOTSPOTS BY DAY 15 Aug3 Sept

Play back 3 Sept 2021

How it evolved, day by day

15 Aug 16 Aug 18 Aug 20 Aug 23 Aug 25 Aug 3 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

34°high

52km/h · peak gust

14%lowest humidity

It had gone 6 days without rain (1 mm or more) when it started. Rain came after the fire: 5.2 mm on 10 Sept.

This area had burned before

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

How big is it?

It burned the equivalent of 4.1% of the area of London (65 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

Stevens where it started

6,485 ha reached on 15 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 area6.1 ha

Residents≈ 150

Inside the perimeter there were about 6.1 hectares of built-up land and about 150 residents (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)
15 Aug	34.4 °C	14 %	50 km/h	0.0 mm	Extreme 52
16 Aug	30.9 °C	24 %	44 km/h	0.0 mm	Very high 48
17 Aug	20.0 °C	52 %	36 km/h	19.5 mm	Very low 1
18 Aug	23.0 °C	33 %	40 km/h	0.0 mm	Low 8
19 Aug	25.0 °C	37 %	32 km/h	0.0 mm	Moderate 13
20 Aug	23.4 °C	44 %	30 km/h	8.4 mm	Very low 2
21 Aug	20.6 °C	60 %	28 km/h	7.4 mm	Very low 0
22 Aug	22.0 °C	33 %	52 km/h	0.0 mm	Very low 5
23 Aug	20.1 °C	32 %	34 km/h	0.0 mm	Low 9
24 Aug	23.2 °C	24 %	19 km/h	0.0 mm	Moderate 14
25 Aug	24.7 °C	23 %	24 km/h	0.0 mm	Moderate 17
26 Aug	23.2 °C	31 %	37 km/h	0.0 mm	Moderate 20
27 Aug	20.8 °C	39 %	34 km/h	1.0 mm	Low 10
28 Aug	24.5 °C	31 %	26 km/h	0.0 mm	Moderate 14
29 Aug	26.9 °C	24 %	21 km/h	0.0 mm	Moderate 18
30 Aug	26.0 °C	20 %	42 km/h	0.0 mm	High 26
31 Aug	19.3 °C	27 %	41 km/h	0.0 mm	High 25
1 Sept	20.4 °C	31 %	23 km/h	0.0 mm	Moderate 20
2 Sept	22.7 °C	25 %	22 km/h	0.0 mm	Moderate 21
3 Sept	24.8 °C	22 %	28 km/h	0.0 mm	High 23
4 Sept after	26.2 °C	19 %	30 km/h	0.0 mm	High 26
5 Sept after	27.5 °C	30 %	38 km/h	0.0 mm	High 29
6 Sept after	26.8 °C	20 %	32 km/h	0.0 mm	High 28
7 Sept after	28.6 °C	20 %	16 km/h	0.0 mm	High 26
8 Sept after	28.0 °C	24 %	44 km/h	0.0 mm	High 35
9 Sept after	28.2 °C	25 %	28 km/h	0.0 mm	High 29
10 Sept after	22.6 °C	42 %	28 km/h	5.2 mm	Very low 4

Before and after, from space

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

↔

Before · 8 Aug 2021

After · 10 Sept 2021

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 · 369Every 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 United States ›

Frequently asked questions

How long did the Ford Corkscrew Fire last?: The official perimeter only gives the start date (15 August 2021). The end comes from the heat detections inside the perimeter: it burned until 3 September 2021 (20 days from 15 August 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 6,542 hectares (65.4 km²). Other tallies, such as daily incident reports, may give slightly different figures.
Which counties burned?: The fire only entered Stevens (6,485 ha, 1.0 %).
What was the weather like?: During the fire the temperature reached 34.4 °C, humidity dropped to 14 % and gusts hit 52 km/h. The fire danger index (FWI) reached 52, class Extreme.
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

NASA FIRMS ↗
NIFC · Fire maps ↗

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.

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 911.

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. 369 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.

Where it burned