Burned area
satellite only7,326ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 23 Mar 2023 – 6 Apr 2023
+− cross-check
No official record is matched to this page to compare it with.
MX · Mexico · –
La Concordia fire, March 2023 La Concordia
Out · last detection 6 Apr 2023, 19:57 UTC
The fire started on 23 March 2023 in La Concordia, Mexico, and satellites saw it burning for 15 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 7,326 hectares from heat detections, spread across a single municipality.
It is the 12th largest in Chiapas since 2016 (of 246 with a page). Number 21 in Mexico in 2023, of 285.
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 only15days
23 Mar 2023 to 6 Apr 2023: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 6 Apr 2023, 19:57 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 only23 Mar 2023
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 23 Mar 2023
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only290
VIIRS detections at 375 m. Most intense hotspot: 50 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 23 Mar 2023 – 6 Apr 2023
+− 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 only626MW
Total radiative power on 25 March 2023; hotspots that day: 63.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 25 Mar 2023
+− 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
model22.2FWI · high
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 4.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 23 Mar 2023, 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
model34.3°C · 39% RH
High of 34.3 °C and minimum humidity of 39% on 5 April 2023; gusts of 38 km/h on 3 April 2023.
- Source
- weather model at the fire’s grid cell
- Date
- 23 Mar 2023 – 6 Apr 2023
- 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.
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 GHSLPopulation and built-up area computed
-
· reconstructed weatherWeather and FWI computed from the ERA5 reanalysis
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
- 7,326 ha
- Dates
- 23 Mar 2023 – 6 Apr 2023
- Name
- La Concordia
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/la-concordia-2023-03?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 la-concordia-2023-03.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023-03-23 | 42 | 223 | 33.7 | 20.5 | 33 | 6.9 | 22 | 0 | 22.2 | alto | 1 |
| 2023-03-24 | 35 | 313 | 31.9 | 20.6 | 45 | 11.5 | 32 | 0.4 | 23.5 | alto | 1 |
| 2023-03-25 | 63 | 626 | 32.5 | 21.4 | 39 | 12.2 | 34.2 | 0 | 24.3 | alto | 1 |
| 2023-03-26 | 36 | 98 | 31.4 | 21.6 | 48 | 10.6 | 31.7 | 0.7 | 17.5 | moderado | 1 |
| 2023-03-27 | 9 | 85 | 31.6 | 20.9 | 44 | 10.3 | 30.2 | 0 | 19.5 | moderado | 1 |
| 2023-03-28 | 9 | 99 | 33 | 21.3 | 38 | 6.5 | 24.8 | 0 | 20.3 | moderado | 1 |
| 2023-03-29 | 16 | 63 | 33.7 | 22.2 | 31 | 12.7 | 31.3 | 0 | 27.9 | alto | 1 |
| 2023-03-30 | 9 | 35 | 32.9 | 19.8 | 26 | 6.8 | 24.5 | 0 | 26.4 | alto | 1 |
| 2023-03-31 | 6 | 22 | 33.8 | 20.3 | 34 | 7.1 | 23.8 | 0 | 26.9 | alto | 1 |
| 2023-04-01 | 2 | 24 | 32.7 | 21.5 | 40 | 7.8 | 27 | 0 | 25.6 | alto | 1 |
| 2023-04-02 | 7 | 100 | 33.8 | 20.8 | 23 | 5.8 | 23 | 0 | 28.3 | alto | 1 |
| 2023-04-03 | 6 | 66 | 32.1 | 21.3 | 47 | 13.4 | 38.2 | 0 | 26.9 | alto | 1 |
| 2023-04-04 | 22 | 130 | 31.6 | 20.5 | 50 | 12.6 | 34.6 | 0 | 24.5 | alto | 1 |
| 2023-04-05 | 23 | 109 | 34.3 | 20 | 39 | 11.3 | 32 | 0 | 25.3 | alto | 1 |
| 2023-04-06 | 5 | 49 | 32.4 | 20.9 | 39 | 8.4 | 27 | 0 | 23.8 | alto | 1 |
| 2023-04-07 | 0 | 0 | 33.5 | 22.8 | 31 | 11.2 | 33.5 | 0 | 29 | alto | 0 |
| 2023-04-08 | 0 | 0 | 33.7 | 21.9 | 28 | 10.2 | 31.7 | 0 | 30.4 | alto | 0 |
| 2023-04-09 | 0 | 0 | 32.9 | 20.4 | 29 | 7.8 | 29.5 | 0 | 29 | alto | 0 |
| 2023-04-10 | 0 | 0 | 32.6 | 20.4 | 34 | 9.2 | 30.6 | 0 | 30.4 | alto | 0 |
| 2023-04-11 | 0 | 0 | 33.2 | 21.1 | 33 | 12.1 | 32.4 | 0 | 33 | alto | 0 |
| 2023-04-12 | 0 | 0 | 30.9 | 20.2 | 45 | 7.7 | 23.8 | 0.5 | 25.2 | alto | 0 |
| 2023-04-13 | 0 | 0 | 31.1 | 19.4 | 41 | 10.9 | 32.4 | 0.4 | 27.6 | alto | 0 |
| 2023-04-14 | 0 | 0 | 33.7 | 19.6 | 34 | 10.4 | 32.8 | 0 | 28.5 | alto | 0 |
| 2023-04-15 | 0 | 0 | 33.6 | 20.5 | 35 | 9.6 | 31.3 | 0 | 28.2 | alto | 0 |
| 2023-04-16 | 0 | 0 | 34.1 | 21.5 | 34 | 11.5 | 29.5 | 0.2 | 29.9 | 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
- 7,326ha
- GWIS perimeter (Copernicus)
- Duration
- 15days
- 23 Mar 2023 – 6 Apr 2023
- Municipalities hit
- 1
- municipalities
- Started on
- 23 Mar
- 2023
- Heat detections
- 290
- in a single hotspot: 50 MW
- Danger at start
- 22
- High · FWI index
- Average daily power
- 136MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
23 Mar6 Apr
6 Apr 2023
How it evolved, day by day
25 Mar
29 Mar
1 Apr
4 Apr
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
38km/h · peak gust
23%lowest humidity
It had gone 4 days without rain (1 mm or more) when it started.
This area had burned before
68% of the perimeter overlaps earlier fires recorded since 2016: 2,943 ha in 2017, 4,205 ha in 2020, 752 ha in 2022. Part of it burned more than once, so the yearly figures add up to more than the 4,998 ha that had burned before.
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
-
La Concordia where it started7,372 ha reached on 23 Mar2.8 %
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 2025Built-up area0.24 ha
Residents< 20
Inside the perimeter there were about 0.24 hectares of 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) |
|---|---|---|---|---|---|
| 23 Mar | 33.7 °C | 33 % | 22 km/h | 0.0 mm | High 22 |
| 24 Mar | 31.9 °C | 45 % | 32 km/h | 0.4 mm | High 24 |
| 25 Mar | 32.5 °C | 39 % | 34 km/h | 0.0 mm | High 24 |
| 26 Mar | 31.4 °C | 48 % | 32 km/h | 0.7 mm | Moderate 18 |
| 27 Mar | 31.6 °C | 44 % | 30 km/h | 0.0 mm | Moderate 20 |
| 28 Mar | 33.0 °C | 38 % | 25 km/h | 0.0 mm | Moderate 20 |
| 29 Mar | 33.7 °C | 31 % | 31 km/h | 0.0 mm | High 28 |
| 30 Mar | 32.9 °C | 26 % | 24 km/h | 0.0 mm | High 26 |
| 31 Mar | 33.8 °C | 34 % | 24 km/h | 0.0 mm | High 27 |
| 1 Apr | 32.7 °C | 40 % | 27 km/h | 0.0 mm | High 26 |
| 2 Apr | 33.8 °C | 23 % | 23 km/h | 0.0 mm | High 28 |
| 3 Apr | 32.1 °C | 47 % | 38 km/h | 0.0 mm | High 27 |
| 4 Apr | 31.6 °C | 50 % | 35 km/h | 0.0 mm | High 24 |
| 5 Apr | 34.3 °C | 39 % | 32 km/h | 0.0 mm | High 25 |
| 6 Apr | 32.4 °C | 39 % | 27 km/h | 0.0 mm | High 24 |
| 7 Apr after | 33.5 °C | 31 % | 34 km/h | 0.0 mm | High 29 |
| 8 Apr after | 33.7 °C | 28 % | 32 km/h | 0.0 mm | High 30 |
| 9 Apr after | 32.9 °C | 29 % | 30 km/h | 0.0 mm | High 29 |
| 10 Apr after | 32.6 °C | 34 % | 31 km/h | 0.0 mm | High 30 |
| 11 Apr after | 33.2 °C | 33 % | 32 km/h | 0.0 mm | High 33 |
| 12 Apr after | 30.9 °C | 45 % | 24 km/h | 0.5 mm | High 25 |
| 13 Apr after | 31.1 °C | 41 % | 32 km/h | 0.4 mm | High 28 |
| 14 Apr after | 33.7 °C | 34 % | 33 km/h | 0.0 mm | High 28 |
| 15 Apr after | 33.6 °C | 35 % | 31 km/h | 0.0 mm | High 28 |
| 16 Apr after | 34.1 °C | 34 % | 30 km/h | 0.2 mm | High 30 |
Its twins: fires that started in the same weather
It started with an FWI of 22.2, a minimum humidity of 33% and 4 days without rain. Fires in the area that started in weather like this since 2016: 17.
FWI at the start
22.2
Minimum humidity
33 %
Days without rain
4
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · La Concordia fire, March 2023
7,326 ha
15 days
FWI 22.2
Min. humidity 33 %
Zinacantán fire, March 2020
2,048 ha
10 days
FWI 21.2
Min. humidity 33 %
67 km away, in 2020
First rain (1 mm or more) after it ended: 26.3 mm on 31 Mar.
La Concordia fire, May 2022
1,624 ha
12 days
FWI 23.5
Min. humidity 31 %
11 km away, in 2022
First rain (1 mm or more) after it ended: 1.1 mm on 24 May.
Villa Corzo fire, April 2023
2,552 ha
12 days
FWI 24.9
Min. humidity 32 %
44 km away, in 2023
First rain (1 mm or more) after it ended: 5.2 mm on 10 May.
Zinacantán fire, March 2016
1,594 ha
11 days
FWI 18.7
Min. humidity 33 %
67 km away, in 2016
First rain (1 mm or more) after it ended: 1.0 mm on 12 Apr.
La Independencia fire, May 2024
2,226 ha
9 days
FWI 19.2
Min. humidity 32 %
103 km away, in 2024
First rain (1 mm or more) after it ended: 2.8 mm on 14 May.
What happened to them
- 8 days
- median duration
- 1,671 ha
- median area
- 100 %
- went past 1,000 ha
- 2.4 mm
- rain at the end (median; 14 of 17 had it)
It was 4.4 times larger than the median of its twins and lasted 15 days, against 8 days.
None of its 17 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 3 of 17, 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 2.4 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
38km/h · max. gust
It was considered over on 6 Apr, and not even 1 mm fell in the following ten days: it went out without rain. Twins with rain when they ended: 14 of 17, with a median of 2.4 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 · 16 Mar 2023
After · 13 Apr 2023
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 26 March 2023 the air beside the fire reached 72 µg/m³ of PM2.5. That day averaged 31: 2.1 times the WHO daily guideline (15).
PM2.5 peak72 µg/m³
Days over the guideline12 days
PM10103 µg/m³
Optical depth0.60
WHO 15
21 Mar25 Mar29 Mar2 Apr6 Apr
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 · 290Every 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
- 7,012 haLa Concordia17 April 2017 · 18 days · 1 km away
- 8,399 haLa Concordia17 April 2020 · 13 days · 2 km away
- 7,494 haLa Concordia24 April 2023 · 8 days · 22 km away
- 5,850 haLa ConcordiaApril 2018 · 14 days · 22 km away
- 9,691 haChicomuseloMay 2024 · 19 days · 29 km away
- 5,338 haLa ConcordiaMay 2024 · 10 days · 29 km away
Frequently asked questions
- How long did the La Concordia fire last?
- GWIS (Copernicus) dates it between 23 March 2023 and 6 April 2023: 15 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 7,326 hectares (73.3 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered La Concordia (7,372 ha, 2.8 %).
- What was the weather like?
- During the fire the temperature reached 34.3 °C, humidity dropped to 23 % and gusts hit 38 km/h. The fire danger index (FWI) reached 28, class High.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Mexico (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: 17. Their median duration was 8 days and their median area 1,671 ha; 100 % went past 1,000 ha. None of its 17 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 3 of 17, 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 2.4 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
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. 290 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 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 4.0 (CC BY 4.0)). 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.