The fire started on 5 April 2021 in Guazapares, Mexico, and satellites saw it burning for 7 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 1,774 hectares from heat detections, spread across 2 municipalities.
It is the 178th largest in Chihuahua since 2016 (of 229 with a page). Number 238 in Mexico in 2021, of 294.
The power measured by the satellite is low (17.2 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.
matches the official recordwith caveatssatellite onlymodel
When copying, the sentence is
Tick the figures you want: they make up the lede and the CSV.
Burned area
with caveats
1,774ha
Perimeter published by GWIS (Copernicus).
This page1,774CONAFOR800
Source
GWIS (Copernicus)
Date
5 Apr 2021 – 11 Apr 2021
+− cross-check
CONAFOR: 800 ha (matched records: 1). Difference between the page and the official record: +121.8%. Matched on 1 November 2026. The two figures differ a lot, so these may not be exactly the same fire: take them as nearby records.
Duration by satellite
satellite only
7days
5 Apr 2021 to 11 Apr 2021: first and last day with fire on the page.
Source
GWIS (Copernicus) · NASA FIRMS · VIIRS
Date
last detection: 11 Apr 2021, 08:36 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 only
5 Apr 2021
First day with fire seen by the satellites or the perimeter.
Source
GWIS (Copernicus) · NASA FIRMS · VIIRS
Date
5 Apr 2021
+− cross-check
The two figures differ a lot, so these may not be exactly the same fire: take them as nearby records.
Hotspots
satellite only
105
VIIRS detections at 375 m. Most intense hotspot: 17 MW.
Source
NASA FIRMS · VIIRS (Suomi NPP)
Date
5 Apr 2021 – 11 Apr 2021
+− 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 only
95MW
Total radiative power on 10 April 2021; hotspots that day: 26.
Source
NASA FIRMS · VIIRS (FRP)
Date
10 Apr 2021
+− 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
model
31.8FWI · high
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 45.
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
model
24.0°C · 11% RH
High of 24.0 °C and minimum humidity of 11% on 8 April 2021; gusts of 52 km/h on 6 April 2021.
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
≈ 40people
Estimated residents inside the perimeter and 0.26 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
· reconstructedofficial
Matched with the official CONAFOR record
Nearby records with very different figures: 800 ha (records: 1).
A 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
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 2020
Built-up area0.26ha
Residents≈ 40
Inside the perimeter there were about 0.26 hectares of built-up land and about 40 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.
According to CONAFOR, this fire started on 5 April 2021 and burned 800 ha (the satellite measured 1,774 ha). The two figures differ a lot, so these may not be exactly the same fire: take them as nearby records.
GuazaparesEj. Ocoviachi y Ej. Rocoroyvo5 April 2021800 ha· extinguished on 12 April 2021· cause: arson
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)
5 Apr
22.3 °C
16 %
49 km/h
0.0 mm
High 32
6 Apr
20.9 °C
23 %
52 km/h
0.0 mm
High 30
7 Apr
20.3 °C
21 %
41 km/h
0.0 mm
High 29
8 Apr
24.0 °C
11 %
49 km/h
0.0 mm
High 34
9 Apr
21.1 °C
17 %
47 km/h
0.0 mm
High 34
10 Apr
22.2 °C
28 %
48 km/h
0.0 mm
High 30
11 Apr
21.4 °C
22 %
45 km/h
0.0 mm
High 30
12 Apr after
21.5 °C
22 %
49 km/h
0.0 mm
High 31
13 Apr after
21.6 °C
23 %
52 km/h
0.0 mm
High 32
14 Apr after
21.5 °C
22 %
53 km/h
0.0 mm
High 33
15 Apr after
21.2 °C
20 %
59 km/h
0.0 mm
High 35
16 Apr after
19.6 °C
20 %
56 km/h
0.0 mm
High 35
17 Apr after
19.1 °C
25 %
53 km/h
0.0 mm
High 32
18 Apr after
18.5 °C
26 %
55 km/h
0.0 mm
High 32
19 Apr after
16.5 °C
22 %
42 km/h
0.0 mm
High 30
20 Apr after
21.4 °C
18 %
40 km/h
0.0 mm
High 30
21 Apr after
19.2 °C
17 %
52 km/h
0.0 mm
High 33
Its twins: fires that started in the same weather
It started with an FWI of 31.8, a minimum humidity of 16% and 45 days without rain. Fires in the area that started in weather like this since 2016: 22.
FWI at the start31.8
Minimum humidity16 %
Days without rain45
this firechosen twinsrest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Guazapares fire, 5 April 2021
1,774 ha7 daysFWI 31.8Min. humidity 16 %
Bocoyna fire, May 2024
1,648 ha7 daysFWI 33.4Min. humidity 15 %43 km away, in 2024
First rain (1 mm or more) after it ended: none in the following ten days.
It stayed below its twins: 1,774 ha against a median of 2,781 ha. It lasted 7 days, against 11 days.
In 13 of 22, 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 1.6 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
52km/h · max. gust
It was considered over on 11 Apr, and not even 1 mm fell in the following ten days: it went out without rain. Twins with rain when they ended: 9 of 22, with a median of 1.6 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.
GWIS (Copernicus) dates it between 5 April 2021 and 11 April 2021: 7 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 1,774 hectares (17.7 km²). It is an estimate: official national figures may differ.
Which municipalities burned?
The fire entered 2 municipalities: Guazapares (1,775 ha, 1.0 %); Uruachi (10 ha, 0.0 %).
What was the weather like?
During the fire the temperature reached 24.0 °C, humidity dropped to 11 % and gusts hit 52 km/h. The fire danger index (FWI) reached 34, 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: 22. Their median duration was 11 days and their median area 2,781 ha; 100 % went past 1,000 ha. In 13 of 22, 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 1.6 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.
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 errorHow 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. 105 Suomi-NPP VIIRS detections on those dates.
Compared with CONAFOR: 800 official ha against 1,774 ha of perimeter; similar, but with reservations.
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.
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.