Burned area
satellite only147,401ha
Union of 2 NIFC WFIGS perimeters: overlapping areas count once.
- Source
- NIFC WFIGS
- Date
- 16 Jul 2026 – 4 Aug 2026
+− cross-check
No official record is matched to this page to compare it with.
US · United States · –
0445 Crosswhite Fire, July 2026 Jefferson, Wheeler, Crook
Out · last detection 4 Aug 2026, 20:34 UTC
The fire started on 16 July 2026 in Jefferson, United States, and satellites saw it burning for 20 days. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 147,401 hectares, spread across 4 counties.
We are reviewing this page: some of its data look inconsistent (the place, the dates or the area), so treat them with caution.
Use this data
Compare with…
Use this data
Fire page data · version 2026-11-05matches the official recordwith caveatssatellite onlymodel
When copying, the sentence is
Tick the figures you want: they make up the lede and the CSV.
Duration by satellite
satellite only20days
16 Jul 2026 to 4 Aug 2026: first and last day with fire on the page.
- Source
- NIFC WFIGS · NASA FIRMS · VIIRS
- Date
- last detection: 4 Aug 2026, 20:34 UTC
+− cross-check
Satellites pass a few times a day and cloud or smoke can hide the fire: a lack of detections is not an official extinction. Each country’s emergency service declares a fire contained or out.
Start
satellite only16 Jul 2026
First day with fire seen by the satellites or the perimeter.
- Source
- NIFC WFIGS · NASA FIRMS · VIIRS
- Date
- 16 Jul 2026
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only4,222
VIIRS detections at 375 m. Most intense hotspot: 345 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP + NOAA-20)
- Date
- 16 Jul 2026 – 4 Aug 2026
+− cross-check
There is no official record to compare with. Each hotspot is a pixel detected in one satellite pass, not a separate fire.
The worst day
satellite only19,420MW
Total radiative power on 18 July 2026; hotspots that day: 1,086.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 18 Jul 2026
+− cross-check
Fire radiative power (FRP) measures the energy the fire gives off when the satellite passes. Added up by day, it compares intensity, not area.
Danger at the start
model41.5FWI · very high
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 18.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 16 Jul 2026, local noon
- Model
- ERA5 0,25° (ECMWF · Copernicus C3S) · Open-Meteo.com
+− cross-check
This is an index computed from weather model data, not a measurement of the fire nor an official warning. Danger warnings are issued by each country’s authority. Emergency number and official warnings
Weather during the fire
model33.2°C · 14% RH
High of 33.2 °C and minimum humidity of 14% on 24 July 2026; gusts of 54 km/h on 16 July 2026.
- Source
- weather model at the fire’s grid cell
- Date
- 16 Jul 2026 – 4 Aug 2026
- Model
- ERA5 0,25° (ECMWF · Copernicus C3S) · Open-Meteo.com
+− cross-check
These are model values for a cell of about 25 km, not from a weather station: they may differ from what was measured on the ground.
Living inside
model≈ 50people
Estimated residents inside the perimeter and 4.4 ha of built-up area (100 m grid, epoch 2025).
- Source
- GHSL R2023A · JRC
- Date
- calculated on 24 October 2026
+− cross-check
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.
This page’s change log has been kept since 24 October 2026: every night what it publishes is compared and the difference is logged. Anything earlier is reconstructed from each source’s date and marked as reconstructed.
Show
-
logLast day with fire: 26 July 2026 → 4 August 2026.
-
· reconstructed weatherWeather and FWI computed from the ERA5 reanalysis
-
logLast day with fire: 23 July 2026 → 26 July 2026.
-
· reconstructed GHSLPopulation and built-up area computed
Area logged each night
Move the slider to see which area the page published each day.
Versioned permanent link
https://worldfires.org/en/fire/0445-crosswhite-fire-2026-07?v=2026-11-05A version keeps the area, dates, name and official record; the area as it was logged (changes under 2% are not logged). The map, hotspots and weather always show today’s data.
Citation
A lede of about 60 words figures only, no adjectives
CSV for this fire 0445-crosswhite-fire-2026-07.csv · daily, no individual hotspots
| fecha | focos_viirs | frp_mw | tmax_c | tmin_c | hr_min_pct | viento_max_kmh | racha_max_kmh | precip_mm | fwi | clase_fwi | dentro_del_incendio |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026-07-16 | 111 | 1,919 | 30.5 | 15.9 | 19 | 20.8 | 53.6 | 0 | 41.5 | muy_alto | 1 |
| 2026-07-17 | 584 | 6,175 | 29.1 | 9.5 | 17 | 15.5 | 40.7 | 0 | 42.8 | muy_alto | 1 |
| 2026-07-18 | 1,086 | 19,420 | 29.6 | 10.6 | 14 | 15.7 | 38.2 | 0 | 46 | muy_alto | 1 |
| 2026-07-19 | 503 | 1,972 | 30.7 | 9.5 | 14 | 16.2 | 41.4 | 0 | 44.7 | muy_alto | 1 |
| 2026-07-20 | 10 | 47 | 25.8 | 17.8 | 28 | 8.8 | 29.9 | 0.3 | 32.5 | alto | 1 |
| 2026-07-21 | 411 | 2,555 | 31.6 | 13.6 | 22 | 14.1 | 35.6 | 0.3 | 36.6 | alto | 1 |
| 2026-07-22 | 155 | 4,756 | 32.6 | 18 | 21 | 12.5 | 36.7 | 1 | 37.8 | alto | 1 |
| 2026-07-23 | 669 | 12,585 | 30.2 | 14.3 | 27 | 15.6 | 37.8 | 0.3 | 32.5 | alto | 1 |
| 2026-07-24 | 0 | 0 | 33.2 | 14.1 | 14 | 17 | 43.6 | 0.1 | 38 | muy_alto | 1 |
| 2026-07-25 | 79 | 1,586 | 29.6 | 13 | 16 | 18.2 | 49.7 | 0 | 55 | extremo | 1 |
| 2026-07-26 | 57 | 496 | 28.5 | 10.9 | 15 | 16.2 | 44.6 | 0 | 46.3 | muy_alto | 1 |
| 2026-07-27 | 0 | 0 | 28.7 | 11.4 | 17 | 12.1 | 38.2 | 0 | 41.2 | muy_alto | 1 |
| 2026-07-28 | 0 | 0 | 27.3 | 11.3 | 24 | 13.7 | 39.6 | 0 | 45.7 | muy_alto | 1 |
| 2026-07-29 | 0 | 0 | 27.6 | 9.1 | 23 | 14.6 | 38.9 | 0 | 39 | muy_alto | 1 |
| 2026-07-30 | 0 | 0 | 28.5 | 10.2 | 17 | 14.2 | 33.1 | 0 | 40.2 | muy_alto | 1 |
| 2026-07-31 | 0 | 0 | 31.7 | 12.2 | 16 | 13.1 | 33.5 | 0 | 46.3 | muy_alto | 1 |
| 2026-08-01 | 0 | 0 | 26.9 | 13.3 | 20 | 18.8 | 49.7 | 0 | 59 | extremo | 1 |
| 2026-08-02 | 0 | 0 | 22.1 | 6.6 | 20 | 15.7 | 41 | 0 | 48.9 | muy_alto | 1 |
| 2026-08-03 | 308 | 3,231 | 23.3 | 5 | 23 | 13.1 | 34.6 | 0 | 45.1 | muy_alto | 1 |
| 2026-08-04 | 249 | 830 | 27.8 | 6.4 | 17 | 11.8 | 31 | 0 | 39.1 | muy_alto | 1 |
| 2026-08-05 | 0 | 0 | 31.4 | 9.8 | 11 | 11.6 | 31.3 | 0 | 44.2 | muy_alto | 0 |
| 2026-08-06 | 0 | 0 | 34.2 | 13.3 | 3 | 13.8 | 34.2 | 0 | 52.4 | extremo | 0 |
| 2026-08-07 | 0 | 0 | 34 | 13.6 | 10 | 14.4 | 35.6 | 0 | 56.1 | extremo | 0 |
| 2026-08-08 | 0 | 0 | 31.4 | 11.8 | 12 | 15.3 | 38.2 | 0 | 57.5 | extremo | 0 |
| 2026-08-09 | 0 | 0 | 29.8 | 12.1 | 12 | 15.7 | 37.4 | 0 | 54.6 | extremo | 0 |
| 2026-08-10 | 0 | 0 | 28.9 | 9.1 | 13 | 13.6 | 35.6 | 0 | 54.4 | extremo | 0 |
| 2026-08-11 | 0 | 0 | 28.8 | 10.2 | 18 | 15.6 | 37.8 | 0 | 53 | extremo | 0 |
| 2026-08-12 | 0 | 0 | 26.4 | 10.4 | 26 | 16 | 37.8 | 0.2 | 49.1 | muy_alto | 0 |
| 2026-08-13 | 0 | 0 | 24.7 | 9.1 | 29 | 11.2 | 27.7 | 0.4 | 38.6 | muy_alto | 0 |
| 2026-08-14 | 0 | 0 | 26.6 | 12.8 | 21 | 12.7 | 32.8 | 0 | 35.7 | alto | 0 |
It is generated in your browser from this page’s data: one file per fire, aggregated by day and without individual hotspots.
Live widget for your story
It updates itself while the fire is still active and links to this page. Free, with the attribution shown at the bottom.
Sources for this page: NIFC WFIGS, NASA FIRMS (VIIRS), ERA5 (ECMWF/Copernicus C3S) · Open-Meteo.com (CC BY 4.0), GHSL (JRC). Open-Meteo.com · How we build fire pages: methodology
- Burnt area
- 147,401ha
- official perimeter (MTBS / NIFC)
- Duration
- ≈ 20days
- 16 Jul 2026 – 4 Aug 2026
- Counties hit
- 4
- counties
- Started on
- 16 Jul
- 2026
- Heat detections
- 4,222
- in a single hotspot: 345 MW
- Danger at start
- 42
- Very high · FWI index
- Average daily power
- 4.6GW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
16 Jul4 Aug
4 Aug 2026
How it evolved, day by day
18 Jul
22 Jul
26 Jul
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
33°high
54km/h · peak gust
14%lowest humidity
It had gone 18 days without rain (1 mm or more) when it started.
This area had burned before
19% of the perimeter overlaps earlier fires recorded since 2016: 7,771 ha in 2017, 19,517 ha in 2018, 721 ha in 2019, 26 ha in 2025.
- 18,989 ha Jennies Peak 1039 Rn fire, August 2018 19,304 ha in total; the hectares shown are those it shares with this fire
- 6,182 ha Rhoades Canyon 0301 Rn fire, June 2017 6,226 ha in total; the hectares shown are those it shares with this fire
- 1,589 ha Desolation 1135 Pr fire, September 2017 1,654 ha in total; the hectares shown are those it shares with this fire
- 26 ha Marks Creek fire, September 2025 695 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 started144,252 ha reached on 16 Jul31 %
-
143,724 ha reached on 16 Jul32 %
-
62,672 ha reached on 16 Jul8.1 %
-
3,685 ha reached on 16 Jul0.6 %
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 2025Built-up area4.4 ha
Residents≈ 50
Inside the perimeter there were about 4.4 hectares of built-up land and about 50 residents (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)
Started with Strong wind: 27 % of the area in United States
| Day | High | Min. humidity | Peak gust | Rain | Danger (FWI) |
|---|---|---|---|---|---|
| 16 Jul | 30.5 °C | 19 % | 54 km/h | 0.0 mm | Very high 42 |
| 17 Jul | 29.1 °C | 17 % | 41 km/h | 0.0 mm | Very high 43 |
| 18 Jul | 29.6 °C | 14 % | 38 km/h | 0.0 mm | Very high 46 |
| 19 Jul | 30.7 °C | 14 % | 41 km/h | 0.0 mm | Very high 45 |
| 20 Jul | 25.8 °C | 28 % | 30 km/h | 0.3 mm | High 32 |
| 21 Jul | 31.6 °C | 22 % | 36 km/h | 0.3 mm | High 37 |
| 22 Jul | 32.6 °C | 21 % | 37 km/h | 1.0 mm | High 38 |
| 23 Jul | 30.2 °C | 27 % | 38 km/h | 0.3 mm | High 32 |
| 24 Jul | 33.2 °C | 14 % | 44 km/h | 0.1 mm | Very high 38 |
| 25 Jul | 29.6 °C | 16 % | 50 km/h | 0.0 mm | Extreme 55 |
| 26 Jul | 28.5 °C | 15 % | 45 km/h | 0.0 mm | Very high 46 |
| 27 Jul | 28.7 °C | 17 % | 38 km/h | 0.0 mm | Very high 41 |
| 28 Jul | 27.3 °C | 24 % | 40 km/h | 0.0 mm | Very high 46 |
| 29 Jul | 27.6 °C | 23 % | 39 km/h | 0.0 mm | Very high 39 |
| 30 Jul | 28.5 °C | 17 % | 33 km/h | 0.0 mm | Very high 40 |
| 31 Jul | 31.7 °C | 16 % | 34 km/h | 0.0 mm | Very high 46 |
| 1 Aug | 26.9 °C | 20 % | 50 km/h | 0.0 mm | Extreme 59 |
| 2 Aug | 22.1 °C | 20 % | 41 km/h | 0.0 mm | Very high 49 |
| 3 Aug | 23.3 °C | 23 % | 35 km/h | 0.0 mm | Very high 45 |
| 4 Aug | 27.8 °C | 17 % | 31 km/h | 0.0 mm | Very high 39 |
| 5 Aug after | 31.4 °C | 11 % | 31 km/h | 0.0 mm | Very high 44 |
| 6 Aug after | 34.2 °C | 3 % | 34 km/h | 0.0 mm | Extreme 52 |
| 7 Aug after | 34.0 °C | 10 % | 36 km/h | 0.0 mm | Extreme 56 |
| 8 Aug after | 31.4 °C | 12 % | 38 km/h | 0.0 mm | Extreme 58 |
| 9 Aug after | 29.8 °C | 12 % | 37 km/h | 0.0 mm | Extreme 55 |
| 10 Aug after | 28.9 °C | 13 % | 36 km/h | 0.0 mm | Extreme 54 |
| 11 Aug after | 28.8 °C | 18 % | 38 km/h | 0.0 mm | Extreme 53 |
| 12 Aug after | 26.4 °C | 26 % | 38 km/h | 0.2 mm | Very high 49 |
| 13 Aug after | 24.7 °C | 29 % | 28 km/h | 0.4 mm | Very high 39 |
| 14 Aug after | 26.6 °C | 21 % | 33 km/h | 0.0 mm | High 36 |
Its twins: fires that started in the same weather
It started with an FWI of 41.5, a minimum humidity of 19% and 18 days without rain. Fires in the area that started in weather like this since 2016: 46.
FWI at the start
41.5
Minimum humidity
19 %
Days without rain
18
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · 0445 Crosswhite Fire, July 2026
147,401 ha
20 days
FWI 41.5
Min. humidity 19 %
Flat Fire, August 2025
9,448 ha
4 days
FWI 39.8
Min. humidity 16 %
81 km away, in 2025
First rain (1 mm or more) after it ended: 3.1 mm on 27 Aug.
Ryegrass 0444 Rs Fire, July 2021
497 ha
1 day
FWI 44.4
Min. humidity 21 %
77 km away, in 2021
First rain (1 mm or more) after it ended: none in the following ten days.
0501 Crazy Creek Fire, July 2024
37,846 ha
8 days
FWI 40.5
Min. humidity 18 %
53 km away, in 2024
First rain (1 mm or more) after it ended: none in the following ten days.
Old Lady Creek Fire, September 2016
1,183 ha
3 days
FWI 40.0
Min. humidity 19 %
128 km away, in 2016
First rain (1 mm or more) after it ended: 3.1 mm on 23 Sept.
Devils Butte 0439 Rv Fire, July 2023
1,189 ha
2 days
FWI 40.0
Min. humidity 23 %
85 km away, in 2023
First rain (1 mm or more) after it ended: none in the following ten days.
What happened to them
- 3 days
- median duration
- 2,268 ha
- median area
- 76 %
- went past 1,000 ha
- 2.0 mm
- rain at the end (median; 22 of 46 had it)
It was 65.0 times larger than the median of its twins and lasted 20 days, against 3 days.
Only 1 of its 46 twins burned more. The weather on the first day does not explain everything: the wind in the following days, the fuel and the firefighting also count. In 24 of 46, not even 1 mm fell in the ten days after the end: they went out without rain. In the rest, the first rainy day brought a median of 2.0 mm.
This is a bank of analogues: it shows what usually happens, not what will happen. With fewer than 15 twins we give no figures. How we calculate it
How it ended
—first rain
—no rain in ten days
54km/h · max. gust
It was considered over on 4 Aug, and not even 1 mm fell in the following ten days: it went out without rain. Twins with rain when they ended: 22 of 46, with a median of 2.0 mm.
Weather on this page: Open-Meteo.com (CC BY 4.0) · Copernicus Climate Change Service (ERA5)
How a twin is chosen
- Same area: fires that have already ended, less than 250 km from this one, since 2016.
- Same start: we compare the FWI on the first day, the minimum humidity that day and the run of days without rain before it. The slider sets how much they may differ.
- Only pages with final weather data (ERA5 reanalysis) calculated in the same way as this fire’s; agricultural and grass burns and pages with data under review are left out.
- Fires burning at the same time as this one (a week before or after) are left out: they share the same spell of weather and do not count as a precedent.
- They are sorted by similarity, and the outlines of the first five are drawn.
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
↔
Before · 9 Jul 2026
After · 11 Aug 2026
Sentinel-2 did not pass over on that day. Try another date, or use false colour, which is daily.
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 21 July 2026 the air beside the fire reached 492 µg/m³ of PM2.5. That day averaged 326: 22 times the WHO daily guideline (15).
PM2.5 peak492 µg/m³
Days over the guideline10 days
PM10508 µg/m³
Optical depth2.37
WHO 15
14 Jul17 Jul20 Jul23 Jul26 Jul
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 · 4,222Every 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
- 19,304 haJennies Peak 1039 Rn WheelerAugust 2018 · 20 days · 25 km away
- 6,226 haRhoades Canyon 0301 Rn WheelerJune 2017 · 6 days · 30 km away
- 38,743 haCram JeffersonJuly 2025 · 6 days · 32 km away
- 11,266 haShoe Fly WheelerSeptember 2024 · 8 days · 36 km away
- 5,131 haWascoAugust 2017 · 1 day · 37 km away
- 2,747 ha0446 Camel Hump WheelerJuly 2026 · 4 days · 37 km away
Frequently asked questions
- How long did the 0445 Crosswhite Fire last?
- The official perimeter only gives the start date (16 July 2026). The end comes from the heat detections inside the perimeter: it burned until 4 August 2026 (20 days from 16 July 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 147,401 hectares (1,474.0 km²). Other tallies, such as daily incident reports, may give slightly different figures.
- Which counties burned?
- The fire entered 4 counties: Jefferson (144,252 ha, 31 %); Wheeler (143,724 ha, 32 %); Crook (62,672 ha, 8.1 %); Wasco (3,685 ha, 0.6 %).
- What was the weather like?
- During the fire the temperature reached 33.2 °C, humidity dropped to 14 % and gusts hit 54 km/h. The fire danger index (FWI) reached 59, 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.
- How did the fires that started in similar weather in this area end?
- Fires less than 250 km away that started since 2016 with a similar FWI, humidity and dry spell: 46. Their median duration was 3 days and their median area 2,268 ha; 76 % went past 1,000 ha. Only 1 of its 46 twins burned more. The weather on the first day does not explain everything: the wind in the following days, the fuel and the firefighting also count. In 24 of 46, not even 1 mm fell in the ten days after the end: they went out without rain. In the rest, the first rainy day brought a median of 2.0 mm.
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 · 2 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
- Last day with fire: 26 July 2026 → 4 August 2026.
- Last day with fire: 23 July 2026 → 26 July 2026.
RSS Changes to this page With cross-checks and a citable version
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. 4,222 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.