Burned area
satellite only2,480ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 12 May 2019 – 29 May 2019
+− cross-check
No official record is matched to this page to compare it with.
MX · Mexico · –
Del Nayar fire, 12 May 2019 Del Nayar
Out · last detection 26 May 2019, 20:53 UTC
The fire started on 12 May 2019 in Del Nayar, Mexico, and satellites saw it burning for 18 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 2,480 hectares from heat detections, spread across a single municipality.
It is the 77th largest in Nayarit since 2016 (of 171 with a page). Number 184 in Mexico in 2019, of 363.
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 only18days
12 May 2019 to 29 May 2019: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 26 May 2019, 20:53 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 only12 May 2019
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 12 May 2019
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only105
VIIRS detections at 375 m. Most intense hotspot: 61 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 12 May 2019 – 29 May 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 only659MW
Total radiative power on 19 May 2019; hotspots that day: 21.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 19 May 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
model53.0FWI · 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
- 12 May 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
model31.9°C · 25% RH
High of 31.9 °C and minimum humidity of 25% on 24 May 2019; gusts of 55 km/h on 12 May 2019.
- Source
- weather model at the fire’s grid cell
- Date
- 12 May 2019 – 29 May 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.
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
- 2,480 ha
- Dates
- 12 May 2019 – 29 May 2019
- Name
- Del Nayar
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/del-nayar-2019-05-4?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 del-nayar-2019-05-4.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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2019-05-12 | 0 | 0 | 28.5 | 10.1 | 23 | 13 | 55.1 | 0.1 | 53 | extremo | 1 |
| 2019-05-13 | 0 | 0 | 29.2 | 8.4 | 19 | 12.1 | 45 | 0 | 50.8 | extremo | 1 |
| 2019-05-14 | 0 | 0 | 30.5 | 9.2 | 18 | 10.4 | 39.2 | 0 | 48.2 | muy_alto | 1 |
| 2019-05-15 | 4 | 7 | 30.9 | 10.1 | 16 | 10 | 37.8 | 0 | 50.2 | extremo | 1 |
| 2019-05-16 | 5 | 11 | 30.8 | 10.4 | 17 | 11.4 | 41.8 | 0 | 51.7 | extremo | 1 |
| 2019-05-17 | 5 | 16 | 30.3 | 12 | 22 | 11.1 | 43.6 | 0 | 51 | extremo | 1 |
| 2019-05-18 | 9 | 21 | 29.2 | 11.6 | 23 | 12.6 | 48.2 | 0 | 52.6 | extremo | 1 |
| 2019-05-19 | 21 | 659 | 31.8 | 9.9 | 15 | 12.2 | 46.1 | 0 | 53.9 | extremo | 1 |
| 2019-05-20 | 20 | 66 | 30.8 | 10 | 20 | 12 | 45 | 0 | 54.5 | extremo | 1 |
| 2019-05-21 | 11 | 45 | 31.1 | 9.6 | 18 | 11.8 | 44.6 | 0 | 54.3 | extremo | 1 |
| 2019-05-22 | 21 | 102 | 30.8 | 9.5 | 13 | 12.4 | 46.4 | 0 | 56.2 | extremo | 1 |
| 2019-05-23 | 6 | 28 | 31.7 | 11.2 | 16 | 11.3 | 42.8 | 0 | 54.9 | extremo | 1 |
| 2019-05-24 | 1 | 0 | 31.9 | 12.5 | 25 | 10.8 | 41 | 0 | 50.8 | extremo | 1 |
| 2019-05-25 | 1 | 3 | 31.7 | 12.7 | 27 | 12.1 | 43.9 | 0 | 49.2 | muy_alto | 1 |
| 2019-05-26 | 1 | 6 | 30.3 | 14.6 | 29 | 11.4 | 43.6 | 0 | 47.8 | muy_alto | 1 |
| 2019-05-27 | 0 | 0 | 29.8 | 16.8 | 38 | 10.3 | 42.1 | 0.6 | 37.9 | alto | 1 |
| 2019-05-28 | 0 | 0 | 29.8 | 16 | 40 | 10.7 | 42.5 | 0.8 | 30.2 | alto | 1 |
| 2019-05-29 | 0 | 0 | 31.3 | 17.2 | 30 | 11.8 | 45.4 | 0 | 33.8 | alto | 1 |
| 2019-05-30 | 0 | 0 | 30.4 | 17 | 38 | 10.3 | 38.5 | 1.1 | 29.7 | 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: 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
- 2,480ha
- GWIS perimeter (Copernicus)
- Duration
- 18days
- 12 May 2019 – 29 May 2019
- Municipalities hit
- 1
- municipalities
- Started on
- 12 May
- 2019
- Heat detections
- 105
- in a single hotspot: 61 MW
- Danger at start
- 53
- Extreme · FWI index
- Average daily power
- 80MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
12 May29 May
26 May 2019
How it evolved, day by day
15 May
19 May
24 May
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
32°high
55km/h · peak gust
13%lowest humidity
It had gone more than two months without rain (1 mm or more) when it started. Rain came after the fire: 1.1 mm on 30 May.
This area had burned before
No earlier perimeters overlap this fire since 2016, when the satellite record begins.
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
-
Del Nayar where it started2,496 ha reached on 15 May0.5 %
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 area< 0.1 ha
Residents< 20
Inside the perimeter there was no noticeable built-up land and almost nobody lived there (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: 19 % of the area in Mexico 60 days without rain: 25 % of the area in Mexico
| Day | High | Min. humidity | Peak gust | Rain | Danger (FWI) |
|---|---|---|---|---|---|
| 12 May | 28.5 °C | 23 % | 55 km/h | 0.1 mm | Extreme 53 |
| 13 May | 29.2 °C | 19 % | 45 km/h | 0.0 mm | Extreme 51 |
| 14 May | 30.5 °C | 18 % | 39 km/h | 0.0 mm | Very high 48 |
| 15 May | 30.9 °C | 16 % | 38 km/h | 0.0 mm | Extreme 50 |
| 16 May | 30.8 °C | 17 % | 42 km/h | 0.0 mm | Extreme 52 |
| 17 May | 30.3 °C | 22 % | 44 km/h | 0.0 mm | Extreme 51 |
| 18 May | 29.2 °C | 23 % | 48 km/h | 0.0 mm | Extreme 53 |
| 19 May | 31.8 °C | 15 % | 46 km/h | 0.0 mm | Extreme 54 |
| 20 May | 30.8 °C | 20 % | 45 km/h | 0.0 mm | Extreme 54 |
| 21 May | 31.1 °C | 18 % | 45 km/h | 0.0 mm | Extreme 54 |
| 22 May | 30.8 °C | 13 % | 46 km/h | 0.0 mm | Extreme 56 |
| 23 May | 31.7 °C | 16 % | 43 km/h | 0.0 mm | Extreme 55 |
| 24 May | 31.9 °C | 25 % | 41 km/h | 0.0 mm | Extreme 51 |
| 25 May | 31.7 °C | 27 % | 44 km/h | 0.0 mm | Very high 49 |
| 26 May | 30.3 °C | 29 % | 44 km/h | 0.0 mm | Very high 48 |
| 27 May | 29.8 °C | 38 % | 42 km/h | 0.6 mm | High 38 |
| 28 May | 29.8 °C | 40 % | 42 km/h | 0.8 mm | High 30 |
| 29 May | 31.3 °C | 30 % | 45 km/h | 0.0 mm | High 34 |
| 30 May after | 30.4 °C | 38 % | 38 km/h | 1.1 mm | High 30 |
Its twins: fires that started in the same weather
It started with an FWI of 53.0, a minimum humidity of 23% and more than two months without rain. Fires in the area that started in weather like this since 2016: 22.
FWI at the start
53.0
Minimum humidity
23 %
Days without rain
60+
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Del Nayar fire, 12 May 2019
2,480 ha
18 days
FWI 53.0
Min. humidity 23 %
Rosamorada fire, April 2018
2,904 ha
13 days
FWI 52.3
Min. humidity 26 %
23 km away, in 2018
First rain (1 mm or more) after it ended: 1.8 mm on 6 May.
La Yesca fire, May 2025
9,509 ha
15 days
FWI 52.2
Min. humidity 21 %
117 km away, in 2025
First rain (1 mm or more) after it ended: none in the following ten days.
Mezquital fire, April 2022
20,388 ha
31 days
FWI 51.4
Min. humidity 24 %
30 km away, in 2022
First rain (1 mm or more) after it ended: 2.5 mm on 10 May.
Del Nayar fire, May 2025
2,788 ha
10 days
FWI 47.3
Min. humidity 23 %
65 km away, in 2025
First rain (1 mm or more) after it ended: 2.3 mm on 5 Jun.
La Yesca fire, April 2024
6,359 ha
8 days
FWI 52.5
Min. humidity 19 %
78 km away, in 2024
First rain (1 mm or more) after it ended: none in the following ten days.
What happened to them
- 13 days
- median duration
- 4,914 ha
- median area
- 18 %
- went past 10,000 ha
- 1.7 mm
- rain at the end (median; 10 of 22 had it)
It stayed below its twins: 2,480 ha against a median of 4,914 ha. It lasted 18 days, against 13 days.
In 12 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 1.7 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
1.1 mmfirst rain
30 Maythe day after it ended
55km/h · max. gust
It was considered over on 29 May, and on 30 May 1.1 mm fell. We do not know whether the rain or the firefighters put it out. Twins with rain when they ended: 10 of 22, with a median of 1.7 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 · 5 May 2019
After · 5 Jun 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 · 105Every 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 Del Nayar fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 12 May 2019 to 29 May 2019 (18 days). The perimeter dates it from 15 May 2019 to 23 May 2019.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 2,480 hectares (24.8 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Del Nayar (2,496 ha, 0.5 %).
- What was the weather like?
- During the fire the temperature reached 31.9 °C, humidity dropped to 13 % and gusts hit 55 km/h. The fire danger index (FWI) reached 56, class Extreme.
- 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 13 days and their median area 4,914 ha; 18 % went past 10,000 ha. In 12 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 1.7 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 adjusted with the VIIRS detections inside the perimeter, which said 15 May 2019 to 23 May 2019. 105 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 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.