Burned area
satellite only18,305ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 10 Sept 2019 – 29 Sept 2019
+− cross-check
No official record is matched to this page to compare it with.
BR · Brazil · –
Nazaré do Piauí fire, September 2019 Nazaré do Piauí, São José do Peixe, Floriano
Out · last detection 29 Sept 2019, 16:19 UTC
The fire started on 10 September 2019 in Nazaré do Piauí, Brazil, and satellites saw it burning for 20 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 18,305 hectares from heat detections, spread across 3 municipalities.
It is the 28th largest in Piaui since 2016 (of 665 with a page). Number 57 in Brazil in 2019, of 973.
Use this data
Compare with…
Use this data
Fire page data · version 2026-10-24matches 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
10 Sept 2019 to 29 Sept 2019: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 29 Sept 2019, 16:19 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 only10 Sept 2019
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 10 Sept 2019
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only1,030
VIIRS detections at 375 m. Most intense hotspot: 164 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 10 Sept 2019 – 29 Sept 2019
+− 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 only1,634MW
Total radiative power on 23 September 2019; hotspots that day: 109.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 23 Sept 2019
+− 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
model60.6FWI · extreme
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
- 10 Sept 2019, 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
model39.9°C · 20% RH
High of 39.9 °C and minimum humidity of 20% on 21 September 2019; gusts of 51 km/h on 10 September 2019.
- Source
- weather model at the fire’s grid cell
- Date
- 10 Sept 2019 – 29 Sept 2019
- 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≈ 80people
Estimated residents inside the perimeter and 0.67 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
-
· reconstructed GHSLPopulation and built-up area computed
What was saved on 24 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
- 18,305 ha
- Dates
- 10 Sept 2019 – 29 Sept 2019
- Name
- Nazaré do Piauí
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/nazare-do-piaui-2019-09?v=2026-10-24A 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 nazare-do-piaui-2019-09.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2019-09-10 | 7 | 79 | 37 | 25.2 | 28 | 21.7 | 50.8 | 0 | 60.6 | extremo | 1 |
| 2019-09-11 | 4 | 10 | 37.9 | 24.7 | 22 | 19.5 | 45 | 0 | 58.8 | extremo | 1 |
| 2019-09-12 | 3 | 10 | 37.7 | 25.8 | 27 | 19.4 | 48.6 | 0 | 58.1 | extremo | 1 |
| 2019-09-13 | 7 | 38 | 38.8 | 26.2 | 24 | 17.6 | 41.8 | 0 | 57.1 | extremo | 1 |
| 2019-09-14 | 19 | 167 | 37.8 | 27 | 28 | 17 | 38.2 | 0 | 49.5 | muy_alto | 1 |
| 2019-09-15 | 32 | 212 | 38 | 25.3 | 20 | 19 | 42.5 | 0 | 56.9 | extremo | 1 |
| 2019-09-16 | 57 | 207 | 37.8 | 26.1 | 25 | 22.3 | 49.7 | 0 | 62.6 | extremo | 1 |
| 2019-09-17 | 32 | 127 | 37.4 | 25.1 | 24 | 21.9 | 46.8 | 0 | 60 | extremo | 1 |
| 2019-09-18 | 56 | 458 | 37.9 | 26 | 29 | 18.2 | 42.8 | 0 | 55.8 | extremo | 1 |
| 2019-09-19 | 34 | 264 | 39.1 | 26.4 | 24 | 18.3 | 43.9 | 0 | 59.7 | extremo | 1 |
| 2019-09-20 | 69 | 381 | 39.2 | 27 | 16 | 19.7 | 46.1 | 0 | 62.9 | extremo | 1 |
| 2019-09-21 | 100 | 647 | 39.9 | 25.5 | 20 | 15.5 | 38.2 | 0 | 55.1 | extremo | 1 |
| 2019-09-22 | 162 | 1,257 | 38.6 | 27.2 | 24 | 16.1 | 39.2 | 0 | 48.8 | muy_alto | 1 |
| 2019-09-23 | 109 | 1,634 | 38.3 | 27.1 | 24 | 19.5 | 42.5 | 0 | 60.5 | extremo | 1 |
| 2019-09-24 | 87 | 901 | 37.4 | 25.7 | 25 | 22.7 | 48.2 | 0 | 65.3 | extremo | 1 |
| 2019-09-25 | 37 | 300 | 38.2 | 25.2 | 20 | 19.6 | 40.7 | 0 | 54.3 | extremo | 1 |
| 2019-09-26 | 81 | 530 | 38.1 | 25.8 | 24 | 19.4 | 45 | 0 | 57.1 | extremo | 1 |
| 2019-09-27 | 75 | 244 | 39.4 | 27.5 | 24 | 19.6 | 45.7 | 0 | 54.6 | extremo | 1 |
| 2019-09-28 | 49 | 584 | 39.9 | 28.6 | 23 | 11.5 | 32 | 0 | 52.1 | extremo | 1 |
| 2019-09-29 | 10 | 47 | 37.2 | 29.8 | 28 | 8.9 | 23.8 | 0 | 44.2 | muy_alto | 1 |
| 2019-09-30 | 0 | 0 | 37.9 | 28.9 | 30 | 10.2 | 29.9 | 0.1 | 49.5 | muy_alto | 0 |
| 2019-10-01 | 0 | 0 | 37.9 | 28.2 | 29 | 15.5 | 39.6 | 0 | 56.6 | extremo | 0 |
| 2019-10-02 | 0 | 0 | 36.9 | 28.1 | 33 | 20.5 | 51.5 | 0 | 58 | extremo | 0 |
| 2019-10-03 | 0 | 0 | 37.6 | 26.5 | 30 | 18.7 | 44.6 | 0 | 55.6 | extremo | 0 |
| 2019-10-04 | 0 | 0 | 37.8 | 27.6 | 31 | 18.8 | 42.1 | 0 | 51.6 | extremo | 0 |
| 2019-10-05 | 0 | 0 | 36.5 | 27.3 | 29 | 17.8 | 40.7 | 0 | 56.3 | extremo | 0 |
| 2019-10-06 | 0 | 0 | 37.8 | 26.4 | 27 | 17.2 | 39.2 | 0 | 50.1 | extremo | 0 |
| 2019-10-07 | 0 | 0 | 38.6 | 27.7 | 25 | 16.3 | 38.5 | 0.1 | 50.2 | extremo | 0 |
| 2019-10-08 | 0 | 0 | 37.9 | 28.5 | 27 | 17.7 | 40.7 | 0 | 58.2 | extremo | 0 |
| 2019-10-09 | 0 | 0 | 38.3 | 27.6 | 24 | 18.7 | 42.1 | 0 | 55.4 | extremo | 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
- 18,305ha
- GWIS perimeter (Copernicus)
- Duration
- 20days
- 10 Sept 2019 – 29 Sept 2019
- Municipalities hit
- 3
- municipalities
- Started on
- 10 Sept
- 2019
- Heat detections
- 1,030
- in a single hotspot: 164 MW
- Danger at start
- 61
- Extreme · FWI index
- Average daily power
- 405MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
10 Sept29 Sept
29 Sept 2019
How it evolved, day by day
10 Sept
14 Sept
18 Sept
23 Sept
26 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
40°high
51km/h · peak gust
16%lowest humidity
It had gone more than two months without rain (1 mm or more) when it started.
This area had burned before
34% of the perimeter overlaps earlier fires recorded since 2016: 2,078 ha in 2016, 4,330 ha in 2018.
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
-
17,537 ha reached on 10 Sept13 %
-
São José do Peixe 3,297 inhabitants465 ha reached on 18 Sept0.4 %
-
Floriano 62,036 inhabitants426 ha reached on 22 Sept0.1 %
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 area0.67 ha
Residents≈ 80
Inside the perimeter there were about 0.67 hectares of built-up land and about 80 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 Strong wind: 3.2 % of the area in Brazil 60 days without rain: 55 % of the area in Brazil
| Day | High | Min. humidity | Peak gust | Rain | Danger (FWI) |
|---|---|---|---|---|---|
| 10 Sept | 37.0 °C | 28 % | 51 km/h | 0.0 mm | Extreme 61 |
| 11 Sept | 37.9 °C | 22 % | 45 km/h | 0.0 mm | Extreme 59 |
| 12 Sept | 37.7 °C | 27 % | 49 km/h | 0.0 mm | Extreme 58 |
| 13 Sept | 38.8 °C | 24 % | 42 km/h | 0.0 mm | Extreme 57 |
| 14 Sept | 37.8 °C | 28 % | 38 km/h | 0.0 mm | Very high 50 |
| 15 Sept | 38.0 °C | 20 % | 42 km/h | 0.0 mm | Extreme 57 |
| 16 Sept | 37.8 °C | 25 % | 50 km/h | 0.0 mm | Extreme 63 |
| 17 Sept | 37.4 °C | 24 % | 47 km/h | 0.0 mm | Extreme 60 |
| 18 Sept | 37.9 °C | 29 % | 43 km/h | 0.0 mm | Extreme 56 |
| 19 Sept | 39.1 °C | 24 % | 44 km/h | 0.0 mm | Extreme 60 |
| 20 Sept | 39.2 °C | 16 % | 46 km/h | 0.0 mm | Extreme 63 |
| 21 Sept | 39.9 °C | 20 % | 38 km/h | 0.0 mm | Extreme 55 |
| 22 Sept | 38.6 °C | 24 % | 39 km/h | 0.0 mm | Very high 49 |
| 23 Sept | 38.3 °C | 24 % | 42 km/h | 0.0 mm | Extreme 60 |
| 24 Sept | 37.4 °C | 25 % | 48 km/h | 0.0 mm | Extreme 65 |
| 25 Sept | 38.2 °C | 20 % | 41 km/h | 0.0 mm | Extreme 54 |
| 26 Sept | 38.1 °C | 24 % | 45 km/h | 0.0 mm | Extreme 57 |
| 27 Sept | 39.4 °C | 24 % | 46 km/h | 0.0 mm | Extreme 55 |
| 28 Sept | 39.9 °C | 23 % | 32 km/h | 0.0 mm | Extreme 52 |
| 29 Sept | 37.2 °C | 28 % | 24 km/h | 0.0 mm | Very high 44 |
| 30 Sept after | 37.9 °C | 30 % | 30 km/h | 0.1 mm | Very high 50 |
| 1 Oct after | 37.9 °C | 29 % | 40 km/h | 0.0 mm | Extreme 57 |
| 2 Oct after | 36.9 °C | 33 % | 52 km/h | 0.0 mm | Extreme 58 |
| 3 Oct after | 37.6 °C | 30 % | 45 km/h | 0.0 mm | Extreme 56 |
| 4 Oct after | 37.8 °C | 31 % | 42 km/h | 0.0 mm | Extreme 52 |
| 5 Oct after | 36.5 °C | 29 % | 41 km/h | 0.0 mm | Extreme 56 |
| 6 Oct after | 37.8 °C | 27 % | 39 km/h | 0.0 mm | Extreme 50 |
| 7 Oct after | 38.6 °C | 25 % | 38 km/h | 0.1 mm | Extreme 50 |
| 8 Oct after | 37.9 °C | 27 % | 41 km/h | 0.0 mm | Extreme 58 |
| 9 Oct after | 38.3 °C | 24 % | 42 km/h | 0.0 mm | Extreme 55 |
Its twins: fires that started in the same weather
It started with an FWI of 60.6, a minimum humidity of 28% and more than two months without rain. Fires in the area that started in weather like this since 2016: 26.
FWI at the start
60.6
Minimum humidity
28 %
Days without rain
60+
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Nazaré do Piauí fire, September 2019
18,305 ha
20 days
FWI 60.6
Min. humidity 28 %
Nazaré do Piauí fire, September 2024
4,939 ha
18 days
FWI 59.6
Min. humidity 25 %
14 km away, in 2024
First rain (1 mm or more) after it ended: none in the following ten days.
Brejo do Piauí fire, August 2021
47,906 ha
42 days
FWI 62.7
Min. humidity 28 %
160 km away, in 2021
First rain (1 mm or more) after it ended: none in the following ten days.
Floriano fire, July 2018
6,004 ha
10 days
FWI 57.3
Min. humidity 30 %
24 km away, in 2018
First rain (1 mm or more) after it ended: none in the following ten days.
Benedito Leite fire, September 2017
6,276 ha
12 days
FWI 59.6
Min. humidity 27 %
204 km away, in 2017
First rain (1 mm or more) after it ended: none in the following ten days.
São José do Peixe fire, July 2016
12,749 ha
31 days
FWI 55.6
Min. humidity 27 %
53 km away, in 2016
First rain (1 mm or more) after it ended: none in the following ten days.
What happened to them
- 17 days
- median duration
- 5,871 ha
- median area
- 23 %
- went past 10,000 ha
- 4.8 mm
- rain at the end (median; 4 of 26 had it)
It was 3.1 times larger than the median of its twins and lasted 20 days, against 17 days.
Only 3 of its 26 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 22 of 26, 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 4.8 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
51km/h · max. gust
It was considered over on 29 Sept, and not even 1 mm fell in the following ten days: it went out without rain. Twins with rain when they ended: 4 of 26, with a median of 4.8 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 · 3 Sept 2019
After · 6 Oct 2019
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.
Detections table · 1,030Every 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
Frequently asked questions
- How long did the Nazaré do Piauí fire last?
- GWIS (Copernicus) dates it between 10 September 2019 and 29 September 2019: 20 days between the first and last heat detection of the perimeter.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 18,305 hectares (183.0 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 3 municipalities: Nazaré do Piauí (17,537 ha, 13 %); São José do Peixe (465 ha, 0.4 %); Floriano (426 ha, 0.1 %).
- What was the weather like?
- During the fire the temperature reached 39.9 °C, humidity dropped to 16 % and gusts hit 51 km/h. The fire danger index (FWI) reached 65, 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: 26. Their median duration was 17 days and their median area 5,871 ha; 23 % went past 10,000 ha. Only 3 of its 26 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 22 of 26, 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 4.8 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 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 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 from the perimeter: the VIIRS detections inside it did not change them. 1,030 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.