Burned area
satellite only5,816ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 11 Sept 2022 – 22 Sept 2022
+− cross-check
No official record is matched to this page to compare it with.
BR · Brazil · –
Colônia do Piauí fire, September 2022 Colônia do Piauí
Out · last detection 22 Sept 2022, 16:01 UTC
The fire started on 11 September 2022 in Colônia do Piauí, Brazil, and satellites saw it burning for 12 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 5,816 hectares from heat detections, spread across a single municipality.
It is the 229th largest in Piaui since 2016 (of 665 with a page). Number 237 in Brazil in 2022, of 682.
Use this data
Compare with…
Use this data
Fire page data · version 2026-10-25matches 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 only12days
11 Sept 2022 to 22 Sept 2022: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 22 Sept 2022, 16:01 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 only11 Sept 2022
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 11 Sept 2022
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only404
VIIRS detections at 375 m. Most intense hotspot: 43 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 11 Sept 2022 – 22 Sept 2022
+− 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 only1,231MW
Total radiative power on 13 September 2022; hotspots that day: 108.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 13 Sept 2022
+− 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
model45.9FWI · very high
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 60.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 11 Sept 2022, 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
model39.1°C · 18% RH
High of 39.1 °C and minimum humidity of 18% on 21 September 2022; gusts of 44 km/h on 13 September 2022.
- Source
- weather model at the fire’s grid cell
- Date
- 11 Sept 2022 – 22 Sept 2022
- 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≈ 70people
Estimated residents inside the perimeter and 1.3 ha of built-up area (100 m grid, epoch 2020).
- 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
-
· reconstructed weatherWeather and FWI computed from the ERA5 reanalysis
-
logStart date: 12 September 2022 → 11 September 2022.
-
· reconstructed GHSLPopulation and built-up area computed
What was saved on 25 October 2026
Every night a snapshot of what the page shows is saved. If anything changes, it appears in the list as a log entry.
- Area
- 5,816 ha
- Dates
- 11 Sept 2022 – 22 Sept 2022
- Name
- Colônia do Piauí
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/colonia-do-piaui-2022-09?v=2026-10-25A 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 colonia-do-piaui-2022-09.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2022-09-11 | 4 | 28 | 37.3 | 23.3 | 20 | 15.5 | 34.9 | 0 | 45.9 | muy_alto | 1 |
| 2022-09-12 | 10 | 135 | 37.4 | 23.6 | 16 | 18.5 | 41.4 | 0 | 52.6 | extremo | 1 |
| 2022-09-13 | 108 | 1,231 | 36.3 | 22.6 | 20 | 20.3 | 44.3 | 0 | 55.1 | extremo | 1 |
| 2022-09-14 | 102 | 849 | 38.1 | 23 | 20 | 14.6 | 33.5 | 0 | 48.6 | muy_alto | 1 |
| 2022-09-15 | 87 | 760 | 37.9 | 24.1 | 23 | 13.4 | 28.4 | 0 | 47.6 | muy_alto | 1 |
| 2022-09-16 | 13 | 30 | 37.4 | 25.6 | 24 | 15.4 | 30.6 | 0 | 49 | muy_alto | 1 |
| 2022-09-17 | 6 | 39 | 37.7 | 23.1 | 18 | 17 | 37.8 | 0 | 51.1 | extremo | 1 |
| 2022-09-18 | 12 | 53 | 37.1 | 24.4 | 19 | 18.3 | 41 | 0 | 52.9 | extremo | 1 |
| 2022-09-19 | 25 | 75 | 36.9 | 24.2 | 22 | 19.7 | 43.9 | 0 | 54.9 | extremo | 1 |
| 2022-09-20 | 13 | 47 | 38 | 24.6 | 19 | 19.8 | 41.8 | 0 | 55.3 | extremo | 1 |
| 2022-09-21 | 12 | 154 | 39.1 | 24 | 18 | 15.5 | 34.9 | 0 | 50.4 | extremo | 1 |
| 2022-09-22 | 12 | 83 | 36.8 | 26.6 | 28 | 15.7 | 34.6 | 0 | 46.4 | muy_alto | 1 |
| 2022-09-23 | 0 | 0 | 37.9 | 26.4 | 25 | 9.6 | 25.9 | 0 | 40.4 | muy_alto | 0 |
| 2022-09-24 | 0 | 0 | 36.3 | 25.7 | 32 | 8.7 | 26.3 | 0.1 | 36.6 | alto | 0 |
| 2022-09-25 | 0 | 0 | 34.9 | 25.8 | 28 | 16.8 | 36.7 | 1 | 36.3 | 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: GWIS (Copernicus), 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
- 5,816ha
- GWIS perimeter (Copernicus)
- Duration
- 12days
- 11 Sept 2022 – 22 Sept 2022
- Municipalities hit
- 1
- municipalities
- Started on
- 11 Sept
- 2022
- Heat detections
- 404
- in a single hotspot: 43 MW
- Danger at start
- 46
- Very high · FWI index
- Average daily power
- 290MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
11 Sept22 Sept
22 Sept 2022
How it evolved, day by day
13 Sept
17 Sept
20 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
39°high
44km/h · peak gust
16%lowest humidity
It had gone more than two months without rain (1 mm or more) when it started. Rain came after the fire: 1.0 mm on 25 Sept.
This area had burned before
54% of the perimeter overlaps earlier fires recorded since 2016: 2,438 ha in 2016, 2,873 ha in 2019, 86 ha in 2021. Part of it burned more than once, so the yearly figures add up to more than the 3,163 ha that had burned before.
- 2,549 ha Colônia do Piauí fire, October 2019 3,210 ha in total; the hectares shown are those it shares with this fire
- 324 ha Santo Inácio do Piauí fire, October 2019 3,504 ha in total; the hectares shown are those it shares with this fire
- 208 ha Santo Inácio do Piauí fire, August 2016 10,981 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 town
-
5,855 ha reached on 11 Sept6.1 %
Burnt area inside each municipality, from crossing the GWIS 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 2020Built-up area1.3 ha
Residents≈ 70
Inside the perimeter there were about 1.3 hectares of built-up land and about 70 residents (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)
Started with 60 days without rain: 55 % of the area in Brazil
| Day | High | Min. humidity | Peak gust | Rain | Danger (FWI) |
|---|---|---|---|---|---|
| 11 Sept | 37.3 °C | 20 % | 35 km/h | 0.0 mm | Very high 46 |
| 12 Sept | 37.4 °C | 16 % | 41 km/h | 0.0 mm | Extreme 53 |
| 13 Sept | 36.3 °C | 20 % | 44 km/h | 0.0 mm | Extreme 55 |
| 14 Sept | 38.1 °C | 20 % | 34 km/h | 0.0 mm | Very high 49 |
| 15 Sept | 37.9 °C | 23 % | 28 km/h | 0.0 mm | Very high 48 |
| 16 Sept | 37.4 °C | 24 % | 31 km/h | 0.0 mm | Very high 49 |
| 17 Sept | 37.7 °C | 18 % | 38 km/h | 0.0 mm | Extreme 51 |
| 18 Sept | 37.1 °C | 19 % | 41 km/h | 0.0 mm | Extreme 53 |
| 19 Sept | 36.9 °C | 22 % | 44 km/h | 0.0 mm | Extreme 55 |
| 20 Sept | 38.0 °C | 19 % | 42 km/h | 0.0 mm | Extreme 55 |
| 21 Sept | 39.1 °C | 18 % | 35 km/h | 0.0 mm | Extreme 50 |
| 22 Sept | 36.8 °C | 28 % | 35 km/h | 0.0 mm | Very high 46 |
| 23 Sept after | 37.9 °C | 25 % | 26 km/h | 0.0 mm | Very high 40 |
| 24 Sept after | 36.3 °C | 32 % | 26 km/h | 0.1 mm | High 37 |
| 25 Sept after | 34.9 °C | 28 % | 37 km/h | 1.0 mm | High 36 |
Its twins: fires that started in the same weather
It started with an FWI of 45.9, a minimum humidity of 20% and more than two months without rain. Fires in the area that started in weather like this since 2016: 50.
FWI at the start
45.9
Minimum humidity
20 %
Days without rain
60+
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Colônia do Piauí fire, September 2022
5,816 ha
12 days
FWI 45.9
Min. humidity 20 %
Colônia do Piauí fire, October 2020
4,961 ha
8 days
FWI 45.5
Min. humidity 21 %
14 km away, in 2020
First rain (1 mm or more) after it ended: 4.0 mm on 26 Oct.
Flores do Piauí fire, October 2021
4,717 ha
6 days
FWI 47.7
Min. humidity 20 %
89 km away, in 2021
First rain (1 mm or more) after it ended: none in the following ten days.
Rio Grande do Piauí fire, October 2024
3,110 ha
4 days
FWI 46.1
Min. humidity 21 %
127 km away, in 2024
First rain (1 mm or more) after it ended: 1.6 mm on 16 Oct.
Oeiras fire, August 2016
3,694 ha
11 days
FWI 46.9
Min. humidity 22 %
29 km away, in 2016
First rain (1 mm or more) after it ended: none in the following ten days.
Floriano fire, September 2023
4,827 ha
11 days
FWI 46.9
Min. humidity 19 %
92 km away, in 2023
First rain (1 mm or more) after it ended: none in the following ten days.
What happened to them
- 14 days
- median duration
- 5,456 ha
- median area
- 22 %
- went past 10,000 ha
- 2.2 mm
- rain at the end (median; 13 of 50 had it)
It burned an area similar to its twins (5,816 ha against a median of 5,456 ha) and lasted 12 days, against 14 days.
In 37 of 50, 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 2.2 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
1.0 mmfirst rain
25 Sept3 days after it ended
44km/h · max. gust
It was considered over on 22 Sept, and on 25 Sept 1.0 mm fell. We do not know whether the rain or the firefighters put it out. Twins with rain when they ended: 13 of 50, with a median of 2.2 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 · 4 Sept 2022
After · 29 Sept 2022
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 25 September 2022 the air beside the fire reached 18 µg/m³ of PM2.5, but no daily average passed the WHO guideline (15).
PM2.5 peak18 µg/m³
Days over the guideline0 days
PM1027 µg/m³
Optical depth0.36
WHO 15
10 Sept14 Sept18 Sept22 Sept
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 · 404Every 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
- 28,001 haSanto Inácio do PiauíJuly 2018 · 29 days · 14 km away
- 25,631 haCampinas do PiauíOctober 2020 · 19 days · 24 km away
- 13,580 haOeirasSeptember 2023 · 14 days · 25 km away
- 16,792 haSão Miguel do FidalgoAugust 2024 · 40 days · 29 km away
- 21,025 haOeirasAugust 2026 · 38 days · 30 km away
- 12,749 haSão José do PeixeJuly 2016 · 31 days · 35 km away
Frequently asked questions
- How long did the Colônia do Piauí fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 11 September 2022 to 22 September 2022 (12 days). The perimeter dates it from 12 September 2022 to 22 September 2022.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 5,816 hectares (58.2 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Colônia do Piauí (5,855 ha, 6.1 %).
- What was the weather like?
- During the fire the temperature reached 39.1 °C, humidity dropped to 16 % and gusts hit 44 km/h. The fire danger index (FWI) reached 55, class Extreme.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Brazil (geoBoundaries). 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: 50. Their median duration was 14 days and their median area 5,456 ha; 22 % went past 10,000 ha. In 37 of 50, 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 2.2 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: 193 · Emergency number and official warnings
Satellite cross-check
History of this page · 1 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
- Start date: 12 September 2022 → 11 September 2022.
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: GWIS (Copernicus), rebuilt from heat detections rather than mapped on imagery.
- Dates adjusted with the VIIRS detections inside the perimeter, which said 12 September 2022 to 22 September 2022. 404 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.
Where this data comes from
The perimeter comes from the Copernicus Global Wildfire Information System (GWIS), which rebuilds it from MODIS and VIIRS heat detections and publishes it under CC BY 4.0. It is not measured on imagery as in Europe, so it is an estimate. Heat detections come from the VIIRS sensors aboard Suomi-NPP and NOAA-20, distributed by NASA FIRMS at 375 m resolution. Municipal boundaries come from geoBoundaries ADM2 (Creative Commons Attribution 3.0 Intergovernmental Organisations (CC BY 3.0 IGO)). The area per municipality is computed by WorldFires by crossing the perimeter with those boundaries, so it may differ from each country’s official figure.