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Log Fire, July 2021 Lake, Klamath

Out · last detection 13 Aug 2021, 09:48 UTC

The fire started on 12 July 2021 in Lake, United States, and satellites saw it burning for 33 days. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 6,482 hectares, spread across 2 counties.

It is the 100th largest in Oregon since 2016 (of 327 with a page). Number 75 in United States in 2021, of 385.

Compare with…

Suggestions: Bootleg · 2021Watson Creek · 2018Withers · 2016Ana · 2017

Burnt area
6,482ha
official perimeter (MTBS / NIFC)
Duration
≈ 33days
12 Jul 2021 – 13 Aug 2021
Counties hit
2
counties
Started on
12 Jul
2021
Heat detections
1,546
in a single hotspot: 158 MW
Danger at start
57
Extreme · FWI index
Average daily power
534MW
detected power per day, on average

Where it burned

HOTSPOTS BY DAY 12 Jul13 Aug
13 Aug 2021

How it evolved, day by day

12 Jul 2021 · 66 MW · 10 13 Jul 2021 · 365 MW · 8 14 Jul 2021 · 1,362 MW · 173 15 Jul 2021 · 3,963 MW · 190 16 Jul 2021 · 381 MW · 89 17 Jul 2021 · 1,096 MW · 83 18 Jul 2021 · 464 MW · 106 19 Jul 2021 · 254 MW · 91 20 Jul 2021 · 74 MW · 6 21 Jul 2021 · 475 MW · 77 22 Jul 2021 · 409 MW · 93 23 Jul 2021 · 1,025 MW · 122 24 Jul 2021 · 4,862 MW · 271 25 Jul 2021 · 374 MW · 119 26 Jul 2021 · 117 MW · 29 28 Jul 2021 · 23 MW · 4 29 Jul 2021 · 51 MW · 24 30 Jul 2021 · 17 MW · 14 2 Aug 2021 · 5 MW · 5 3 Aug 2021 · 9 MW · 5 4 Aug 2021 · 5 MW · 1 5 Aug 2021 · 8 MW · 2 6 Aug 2021 · 9 MW · 3 7 Aug 2021 · 10 MW · 3 8 Aug 2021 · 3 MW · 1 9 Aug 2021 · 28 MW · 1 10 Aug 2021 · 25 MW · 8 11 Aug 2021 · 11 MW · 5 13 Aug 2021 · 2 MW · 3
12 Jul 17 Jul 22 Jul 24 Jul 28 Jul 4 Aug 9 Aug

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
59km/h · peak gust
6%lowest humidity

It had gone 19 days without rain (1 mm or more) when it started.

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 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

  1. Lake where it started
    5,520 ha reached on 12 Jul
    0.2 %
  2. Klamath
    943 ha reached on 14 Jul
    0.1 %

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)
12 Jul 33.8 °C 11 % 47 km/h 0.0 mm Extreme 57
13 Jul 32.0 °C 6 % 30 km/h 0.0 mm Very high 48
14 Jul 33.1 °C 10 % 44 km/h 0.0 mm Extreme 57
15 Jul 30.5 °C 16 % 41 km/h 0.0 mm Extreme 52
16 Jul 28.5 °C 15 % 40 km/h 0.0 mm Very high 50
17 Jul 30.2 °C 13 % 41 km/h 0.0 mm Very high 50
18 Jul 32.7 °C 7 % 37 km/h 0.0 mm Extreme 52
19 Jul 31.0 °C 13 % 44 km/h 0.0 mm Extreme 56
20 Jul 29.1 °C 20 % 42 km/h 0.5 mm Very high 49
21 Jul 27.8 °C 14 % 42 km/h 0.0 mm Very high 49
22 Jul 29.2 °C 11 % 40 km/h 0.0 mm Very high 50
23 Jul 30.4 °C 9 % 25 km/h 0.0 mm Very high 44
24 Jul 31.3 °C 12 % 42 km/h 0.0 mm Very high 50
25 Jul 32.4 °C 15 % 33 km/h 0.0 mm Very high 48
26 Jul 30.0 °C 22 % 41 km/h 0.9 mm High 34
27 Jul 19.4 °C 54 % 35 km/h 10.5 mm Very low 1
28 Jul 28.0 °C 19 % 37 km/h 0.0 mm Moderate 14
29 Jul 31.2 °C 17 % 42 km/h 0.0 mm High 33
30 Jul 25.9 °C 27 % 32 km/h 0.0 mm High 30
31 Jul 26.7 °C 31 % 39 km/h 1.1 mm Moderate 18
1 Aug 27.5 °C 25 % 19 km/h 0.0 mm High 24
2 Aug 30.6 °C 11 % 38 km/h 0.0 mm Very high 42
3 Aug 30.2 °C 10 % 37 km/h 0.0 mm Very high 44
4 Aug 30.8 °C 9 % 38 km/h 0.0 mm Extreme 50
5 Aug 23.6 °C 24 % 59 km/h 1.9 mm High 23
6 Aug 26.7 °C 18 % 31 km/h 0.0 mm High 28
7 Aug 29.7 °C 18 % 44 km/h 0.0 mm Very high 41
8 Aug 26.4 °C 12 % 37 km/h 0.0 mm Very high 40
9 Aug 28.0 °C 12 % 27 km/h 0.0 mm Very high 38
10 Aug 31.7 °C 9 % 24 km/h 0.0 mm Very high 43
11 Aug 33.2 °C 10 % 32 km/h 0.0 mm Very high 47
12 Aug 33.1 °C 16 % 24 km/h 0.5 mm Very high 42
13 Aug 31.0 °C 19 % 35 km/h 0.8 mm High 32
14 Aug after 31.6 °C 18 % 27 km/h 0.0 mm High 38
15 Aug after 34.4 °C 13 % 46 km/h 0.0 mm Very high 49
16 Aug after 31.3 °C 13 % 45 km/h 0.0 mm Extreme 53
17 Aug after 20.6 °C 13 % 50 km/h 0.0 mm Extreme 52
18 Aug after 18.8 °C 30 % 49 km/h 0.0 mm Very high 40
19 Aug after 23.4 °C 22 % 40 km/h 0.0 mm High 37
20 Aug after 25.2 °C 14 % 45 km/h 0.0 mm Very high 44
21 Aug after 20.9 °C 19 % 36 km/h 0.0 mm Very high 38
22 Aug after 24.9 °C 12 % 42 km/h 0.0 mm Very high 44
23 Aug after 25.1 °C 12 % 31 km/h 0.0 mm Very high 40

Before and after, from space

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

Before · 5 Jul 2021
After · 20 Aug 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 · 1,546Every 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 Log Fire last?
The official perimeter only gives the start date (12 July 2021). The end comes from the heat detections inside the perimeter: it burned until 13 August 2021 (33 days from 12 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 6,482 hectares (64.8 km²). Other tallies, such as daily incident reports, may give slightly different figures.
Which counties burned?
The fire entered 2 counties: Lake (5,520 ha, 0.2 %); Klamath (943 ha, 0.1 %).
What was the weather like?
During the fire the temperature reached 33.8 °C, humidity dropped to 6 % and gusts hit 59 km/h. The fire danger index (FWI) reached 57, 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

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. 1,546 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.