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Norton Fire, August 2022 Valley

Out · last detection 12 Sept 2022, 09:42 UTC

The fire started on 1 August 2022 in Valley, United States, and satellites saw it burning for 43 days. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 4,676 hectares, spread across a single county.

It is the 75th largest in Idaho since 2016 (of 379 with a page). Number 105 in United States in 2022, of 493.

Compare with…

Suggestions: Rush Creek · 2021Woodtick · 2022Kiwah · 2018Rush · 2025

Burnt area
4,676ha
official perimeter (MTBS / NIFC)
Duration
≈ 43days
1 Aug 2022 – 12 Sept 2022
Counties hit
1
counties
Started on
1 Aug
2022
Heat detections
1,334
in a single hotspot: 385 MW
Danger at start
22
High · FWI index
Average daily power
630MW
detected power per day, on average

Where it burned

HOTSPOTS BY DAY 1 Aug12 Sept
12 Sept 2022

How it evolved, day by day

11 Aug 2022 · 16 MW · 6 12 Aug 2022 · 15 MW · 2 16 Aug 2022 · 61 MW · 9 17 Aug 2022 · 290 MW · 23 18 Aug 2022 · 1,851 MW · 58 19 Aug 2022 · 1,402 MW · 40 20 Aug 2022 · 17 MW · 12 21 Aug 2022 · 17 MW · 5 22 Aug 2022 · 41 MW · 9 23 Aug 2022 · 80 MW · 11 24 Aug 2022 · 276 MW · 22 25 Aug 2022 · 293 MW · 34 26 Aug 2022 · 210 MW · 18 27 Aug 2022 · 271 MW · 29 28 Aug 2022 · 44 MW · 6 29 Aug 2022 · 76 MW · 16 30 Aug 2022 · 13 MW · 14 31 Aug 2022 · 241 MW · 33 1 Sept 2022 · 454 MW · 53 2 Sept 2022 · 370 MW · 40 3 Sept 2022 · 46 MW · 27 4 Sept 2022 · 1,924 MW · 109 5 Sept 2022 · 4,084 MW · 217 6 Sept 2022 · 344 MW · 80 7 Sept 2022 · 1,851 MW · 90 8 Sept 2022 · 1,074 MW · 67 9 Sept 2022 · 336 MW · 91 10 Sept 2022 · 995 MW · 71 11 Sept 2022 · 2,024 MW · 76 12 Sept 2022 · 193 MW · 66
11 Aug 19 Aug 24 Aug 29 Aug 3 Sept 5 Sept 8 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

30°high
70km/h · peak gust
10%lowest humidity

It had gone 18 days without rain (1 mm or more) when it started. Rain came after the fire: 7.4 mm on 13 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 3% of the area of London (47 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. Valley where it started
    4,672 ha reached on 11 Aug
    0.5 %

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)
1 Aug 27.7 °C 21 % 37 km/h 1.3 mm High 22
2 Aug 25.0 °C 24 % 48 km/h 0.0 mm High 29
3 Aug 25.7 °C 26 % 44 km/h 0.1 mm High 29
4 Aug 26.4 °C 21 % 70 km/h 0.1 mm Very high 39
5 Aug 24.6 °C 23 % 51 km/h 0.2 mm High 35
6 Aug 22.1 °C 23 % 37 km/h 2.4 mm Low 10
7 Aug 26.5 °C 13 % 31 km/h 0.0 mm High 28
8 Aug 28.5 °C 16 % 36 km/h 0.0 mm High 34
9 Aug 26.2 °C 20 % 30 km/h 0.3 mm High 32
10 Aug 20.6 °C 46 % 44 km/h 3.1 mm Low 6
11 Aug 26.2 °C 30 % 30 km/h 2.4 mm Very low 5
12 Aug 26.1 °C 29 % 34 km/h 6.8 mm Very low 3
13 Aug 24.9 °C 23 % 47 km/h 0.1 mm Moderate 15
14 Aug 26.0 °C 15 % 36 km/h 0.0 mm High 24
15 Aug 27.7 °C 17 % 23 km/h 0.0 mm High 25
16 Aug 28.8 °C 15 % 19 km/h 0.0 mm High 28
17 Aug 29.7 °C 14 % 28 km/h 0.0 mm High 31
18 Aug 28.7 °C 17 % 22 km/h 0.0 mm High 32
19 Aug 26.9 °C 26 % 35 km/h 1.1 mm Moderate 18
20 Aug 22.7 °C 45 % 20 km/h 4.8 mm Very low 3
21 Aug 25.7 °C 23 % 25 km/h 0.0 mm Moderate 12
22 Aug 24.5 °C 26 % 31 km/h 1.8 mm Low 9
23 Aug 25.2 °C 25 % 24 km/h 0.1 mm Moderate 16
24 Aug 25.4 °C 22 % 35 km/h 0.9 mm Moderate 18
25 Aug 23.8 °C 27 % 45 km/h 0.7 mm Moderate 20
26 Aug 23.3 °C 25 % 49 km/h 0.1 mm High 25
27 Aug 21.4 °C 19 % 67 km/h 0.0 mm High 32
28 Aug 21.7 °C 23 % 36 km/h 0.0 mm High 26
29 Aug 26.4 °C 19 % 24 km/h 0.0 mm High 26
30 Aug 27.8 °C 15 % 27 km/h 0.0 mm High 31
31 Aug 29.2 °C 16 % 33 km/h 0.0 mm High 32
1 Sept 27.6 °C 11 % 35 km/h 0.0 mm High 36
2 Sept 29.0 °C 10 % 23 km/h 0.0 mm High 36
3 Sept 27.6 °C 17 % 62 km/h 0.0 mm Very high 45
4 Sept 27.9 °C 12 % 44 km/h 0.0 mm Very high 41
5 Sept 27.2 °C 12 % 44 km/h 0.0 mm Very high 41
6 Sept 27.8 °C 17 % 56 km/h 0.1 mm Very high 45
7 Sept 26.8 °C 18 % 63 km/h 1.1 mm High 33
8 Sept 20.5 °C 15 % 49 km/h 0.0 mm High 34
9 Sept 16.8 °C 20 % 33 km/h 0.0 mm High 30
10 Sept 22.3 °C 16 % 18 km/h 0.0 mm High 29
11 Sept 24.5 °C 13 % 24 km/h 0.0 mm High 32
12 Sept 23.1 °C 16 % 30 km/h 0.0 mm High 34
13 Sept after 14.7 °C 36 % 24 km/h 7.4 mm Very low 1

Before and after, from space

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

Before · 25 Jul 2022
After · 19 Sept 2022

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 4 August 2022 the air beside the fire reached 25 µg/m³ of PM2.5, but no daily average passed the WHO guideline (15).

PM2.5 peak25 µg/m³
Days over the guideline0 days
PM1036 µg/m³
Optical depth0.22
4
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 · 1,334Every 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 Norton Fire last?
The official perimeter only gives the start date (1 August 2022). The end comes from the heat detections inside the perimeter: it burned until 12 September 2022 (43 days from 1 August 2022), 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 4,676 hectares (46.8 km²). Other tallies, such as daily incident reports, may give slightly different figures.
Which counties burned?
The fire only entered Valley (4,672 ha, 0.5 %).
What was the weather like?
During the fire the temperature reached 29.7 °C, humidity dropped to 10 % and gusts hit 70 km/h. The fire danger index (FWI) reached 45, 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.

Report an error
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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 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. 1,334 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.