Unit 12 Middle Fire, September 2026 Jefferson
The fire started on 8 September 2026 in Jefferson, United States, and satellites saw it burning for 13 days. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 1,671 hectares, spread across a single county.
We are reviewing this page: some of its data look inconsistent (the place, the dates or the area), so treat them with caution.
The power measured by the satellite is low (25.2 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.
Compare with…
- Burnt area
- 1,671ha
- official perimeter (MTBS / NIFC)
- Duration
- ≈ 13days
- 8 Sept 2026 – 20 Sept 2026
- Counties hit
- 1
- counties
- Started on
- 8 Sept
- 2026
- Heat detections
- 84
- in a single hotspot: 25 MW
- Danger at start
- 0
- Very low · FWI index
- Average daily power
- 136MW
- detected power per day, on average
Where it burned
How it evolved, day by day
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
It had gone 0 days without rain (1 mm or more) when it started. Rain came after the fire: 1.6 mm on 21 Sept.
This area had burned before
100% of the perimeter overlaps earlier fires recorded since 2016: 632 ha in 2016, 3,633 ha in 2017, 1,303 ha in 2020, 1,509 ha in 2021, 3,620 ha in 2022, 911 ha in 2023. Part of it burned more than once, so the yearly figures add up to more than the 5,686 ha that had burned before.
- 3,037 ha Wf Perkins Blowout fire, October 2017 3,093 ha in total; the hectares shown are those it shares with this fire
- 1,957 ha Unit 1 fire, September 2022 1,989 ha in total; the hectares shown are those it shares with this fire
- 1,509 ha Holdover fire, July 2021 1,917 ha in total; the hectares shown are those it shares with this fire
- 1,297 ha Wf Valentines 2020 fire, February 2020 1,307 ha in total; the hectares shown are those it shares with this fire
- 911 ha Star Lake fire, October 2023 961 ha in total; the hectares shown are those it shares with this fire
- 596 ha Unit 12 Afternoon Fire fire, July 2017 709 ha in total; the hectares shown are those it shares with this fire
How big is it?
London boundary: geoBoundaries · Office for National Statistics (Open Government Licence v3.0).
Paris boundary: geoBoundaries · Institut national de l'information géographique et forestière (IGN-F) (Etalab Open License 2.0).
Madrid boundary: geoBoundaries · Open Data ESRI, IGN Central Registry of Cartography Area (CC BY 4.0).
Berlin boundary: geoBoundaries · Federal Agency for Cartography and Geodesy (dl-de/by-2-0).
This compares size, not location: both shapes are at the same scale, north up, centred on each other.
What happened to each county
-
Jefferson where it started7,583 ha reached on 9 Sept3.0 %
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 2025Inside the perimeter there was no noticeable built-up land and almost nobody lived there (GHSL 2025, 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. The GHSL 2025 epoch is a projection made from 2020 and earlier data.
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) |
|---|---|---|---|---|---|
| 8 Sept | 31.2 °C | 66 % | 21 km/h | 3.1 mm | Very low 0 |
| 9 Sept | 29.4 °C | 80 % | 24 km/h | 9.5 mm | Very low 0 |
| 10 Sept | 29.6 °C | 73 % | 18 km/h | 4.1 mm | Very low 0 |
| 11 Sept | 29.7 °C | 77 % | 28 km/h | 8.4 mm | Very low 0 |
| 12 Sept | 31.9 °C | 68 % | 30 km/h | 3.6 mm | Very low 0 |
| 13 Sept | 30.4 °C | 74 % | 25 km/h | 4.0 mm | Very low 0 |
| 14 Sept | 31.8 °C | 68 % | 22 km/h | 0.7 mm | Very low 0 |
| 15 Sept | 32.0 °C | 72 % | 25 km/h | 0.7 mm | Very low 1 |
| 16 Sept | 31.9 °C | 68 % | 26 km/h | 0.6 mm | Very low 2 |
| 17 Sept | 31.4 °C | 62 % | 32 km/h | 5.9 mm | Very low 1 |
| 18 Sept | 30.8 °C | 51 % | 29 km/h | 0.0 mm | Very low 3 |
| 19 Sept | 30.5 °C | 62 % | 26 km/h | 0.4 mm | Very low 3 |
| 20 Sept | 31.1 °C | 67 % | 25 km/h | 0.3 mm | Very low 5 |
| 21 Sept after | 31.4 °C | 65 % | 17 km/h | 1.6 mm | Very low 1 |
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
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 · CopernicusOn 10 September 2026 the air beside the fire reached 25 µg/m³ of PM2.5, but no daily average passed the WHO guideline (15).
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 · 84Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
- 1,917 haHoldover JeffersonJuly 2021 · 2 days · 1 km away
- 1,989 haUnit 1 JeffersonSeptember 2022 · 2 days · 5 km away
- 3,093 haWf Perkins Blowout JeffersonOctober 2017 · 2 days · 7 km away
- 3,932 haMud Bayou ChambersSeptember 2026 · 7 days · 8 km away
- 1,389 haWidgeon JeffersonNovember 2022 · 2 days · 17 km away
- 3,834 haH And H Complex JeffersonOctober 2023 · 12 days · 30 km away
Frequently asked questions
- How long did the Unit 12 Middle Fire last?
- The official perimeter only gives the start date (8 September 2026). The end comes from the heat detections inside the perimeter: it burned until 20 September 2026 (13 days from 8 September 2026), 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 1,671 hectares (16.7 km²). Other tallies, such as daily incident reports, may give slightly different figures.
- Which counties burned?
- The fire only entered Jefferson (7,583 ha, 3.0 %).
- What was the weather like?
- During the fire the temperature reached 32.0 °C, humidity dropped to 51 % and gusts hit 32 km/h. The fire danger index (FWI) reached 5, class Very low.
- 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 ›
- NIFC · National Interagency Fire Center ↗
- InciWeb · Incident Information System ↗
- MTBS · Monitoring Trends in Burn Severity ↗
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.
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
How we know this
- Perimeter: NIFC WFIGS (United States), official; 2 polygons grouped in this page.
- 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. 84 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 2025, 100 m cells), summed inside the perimeter: an estimate of what was there, not a damage count.
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.