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Second Flat Fire, July 2026 Harney

Out · last detection 25 Jul 2026, 21:42 UTC

The fire started on 24 July 2026 in Harney, United States, and satellites saw it burning for 1 day. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 42,838 hectares, spread across a single county.

It is the 18th largest in Oregon since 2016 (of 327 with a page). Number 11 in United States in 2026, of 423.

Burnt area
42,838ha
official perimeter (MTBS / NIFC)
Duration
1day
24 Jul 2026 – 24 Jul 2026
Municipalities hit
1
counties
Started on
24 Jul
2026
Heat detections
2,336
in a single hotspot: 615 MW
Danger at start
64
Extreme · FWI index
Energy released
41.9GW
sum of detected power

Where it burned

HOTSPOTS BY DAY 24 Jul24 Jul

How it evolved, day by day

25

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
31km/h · peak gust
5%lowest humidity

It had gone 16 days without rain (1 mm or more) when it started.

This area had burned before

1% of the perimeter overlaps earlier fires recorded since 2016: 402 ha in 2024.

What happened to each town

  1. Harney where it started
    43,941 ha reached on 25 Jul
    1.7 %

Burnt area inside each county, from crossing the official 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)
24 Jul 33.8 °C 5 % 31 km/h 0.0 mm Extreme 64
25 Jul after 30.9 °C 8 % 35 km/h 0.0 mm Very extreme 73
26 Jul after 28.5 °C 12 % 23 km/h 0.0 mm Extreme 52
27 Jul after 28.8 °C 13 % 27 km/h 0.0 mm Very high 49
28 Jul after 29.2 °C 16 % 36 km/h 0.0 mm Extreme 51
29 Jul after 30.5 °C 15 % 34 km/h 0.0 mm Extreme 50
30 Jul after 30.6 °C 16 % 34 km/h 0.0 mm Very high 50
31 Jul after 33.2 °C 11 % 33 km/h 0.0 mm Extreme 51
1 Aug after 30.4 °C 15 % 53 km/h 0.0 mm Very extreme 70
2 Aug after 25.5 °C 9 % 39 km/h 0.0 mm Extreme 64
3 Aug after 25.0 °C 12 % 37 km/h 0.0 mm Very high 47

Before and after, from space

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

Before · 17 Jul 2026
After · 31 Jul 2026

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 26 July 2026 the air beside the fire reached 256 µg/m³ of PM2.5. That day averaged 104: 7.0 times the WHO daily guideline (15).

PM2.5 peak256 µg/m³
Days over the guideline15 days
PM10262 µg/m³
Optical depth1.58
1516171819202122232425262728293031123
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 · 2,336Every 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 Second Flat fire last?
It burned between 24 July 2026 and 24 July 2026: 1 day, according to the start date recorded by United States agencies (MTBS / NIFC) and the heat detections seen by satellite.
How much area did it burn?
The official perimeter published by United States agencies (MTBS / NIFC) is 42,838 hectares (428.4 km²). Other tallies, such as daily incident reports, may give slightly different figures.
Which counties burned?
The fire only entered Harney (43,941 ha, 1.7 %).
What was the weather like?
During the fire the temperature reached 33.8 °C, humidity dropped to 5 % and gusts hit 31 km/h. The fire danger index (FWI) reached 64, 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

Satellite cross-check

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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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.

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.