Burned area
satellite only11,083ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 26 Sept 2022 – 20 Oct 2022
+− cross-check
No official record is matched to this page to compare it with.
MG · Madagascar · –
Marovoay fire, September 2022 Marovoay
Out · last detection 21 Oct 2022, 10:09 UTC
The fire started on 26 September 2022 in Marovoay, Madagascar, and satellites saw it burning for 25 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 11,083 hectares from heat detections, spread across a single municipality.
It is the 5th largest in Boeny since 2016 (of 24 with a page). Number 3 in Madagascar in 2022, of 34.
Use this data
Compare with…
Use this data
Fire page data · version 2026-10-27matches 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 only25days
26 Sept 2022 to 20 Oct 2022: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 21 Oct 2022, 10:09 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 only26 Sept 2022
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 26 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 only489
VIIRS detections at 375 m. Most intense hotspot: 419 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 26 Sept 2022 – 20 Oct 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 only2,452MW
Total radiative power on 29 September 2022; hotspots that day: 95.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 29 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
model46.8FWI · very high
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 24.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 26 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
model37.2°C · 16% RH
High of 37.2 °C and minimum humidity of 16% on 5 October 2022; gusts of 45 km/h on 8 October 2022.
- Source
- weather model at the fire’s grid cell
- Date
- 26 Sept 2022 – 20 Oct 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.
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
-
logLast day with fire: 16 October 2022 → 20 October 2022.
-
logStart date: 27 September 2022 → 26 September 2022.
-
· reconstructed weatherWeather and FWI computed from the ERA5 reanalysis
-
· reconstructed GHSLPopulation and built-up area computed
What was saved on 27 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
- 11,083 ha
- Dates
- 26 Sept 2022 – 20 Oct 2022
- Name
- Marovoay
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/marovoay-2022-09?v=2026-10-27A 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 marovoay-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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2022-09-26 | 0 | 0 | 36.2 | 20.9 | 26 | 21.3 | 42.1 | 0 | 46.8 | muy_alto | 1 |
| 2022-09-27 | 3 | 12 | 35.9 | 20.1 | 21 | 18.9 | 41 | 0 | 46.9 | muy_alto | 1 |
| 2022-09-28 | 55 | 1,748 | 34.2 | 17.9 | 20 | 21.4 | 41.4 | 0 | 50 | muy_alto | 1 |
| 2022-09-29 | 95 | 2,452 | 34.2 | 17.9 | 18 | 19.7 | 37.1 | 0 | 49.4 | muy_alto | 1 |
| 2022-09-30 | 63 | 1,401 | 34.2 | 18.6 | 23 | 12.7 | 33.5 | 0 | 42.2 | muy_alto | 1 |
| 2022-10-01 | 42 | 714 | 33.5 | 19 | 22 | 11.1 | 30.6 | 0 | 40.9 | muy_alto | 1 |
| 2022-10-02 | 6 | 60 | 34.4 | 19.5 | 27 | 14.8 | 36.4 | 0 | 43.6 | muy_alto | 1 |
| 2022-10-03 | 22 | 646 | 34.1 | 19.3 | 18 | 13.6 | 31 | 0 | 43.1 | muy_alto | 1 |
| 2022-10-04 | 14 | 127 | 36 | 19.6 | 18 | 14.5 | 30.6 | 0 | 45.4 | muy_alto | 1 |
| 2022-10-05 | 8 | 192 | 37.2 | 19.5 | 16 | 10.6 | 29.5 | 0 | 43.7 | muy_alto | 1 |
| 2022-10-06 | 2 | 13 | 36.1 | 20.4 | 20 | 14.7 | 31.7 | 0 | 48.4 | muy_alto | 1 |
| 2022-10-07 | 22 | 487 | 36.4 | 19.7 | 20 | 21.5 | 43.2 | 0 | 56.9 | extremo | 1 |
| 2022-10-08 | 19 | 356 | 34.8 | 19.6 | 22 | 21.5 | 44.6 | 0 | 56 | extremo | 1 |
| 2022-10-09 | 18 | 222 | 35 | 19.9 | 19 | 21.3 | 43.6 | 0 | 56.1 | extremo | 1 |
| 2022-10-10 | 28 | 1,324 | 35.5 | 18.7 | 21 | 17.4 | 34.9 | 0 | 51.6 | extremo | 1 |
| 2022-10-11 | 14 | 291 | 35.1 | 19.9 | 19 | 11.4 | 29.5 | 0 | 45.1 | muy_alto | 1 |
| 2022-10-12 | 10 | 80 | 35.4 | 20.8 | 18 | 15.4 | 32.4 | 0 | 49.7 | muy_alto | 1 |
| 2022-10-13 | 22 | 170 | 35.6 | 19.1 | 22 | 22 | 44.3 | 0 | 57.5 | extremo | 1 |
| 2022-10-14 | 21 | 326 | 35 | 20.2 | 19 | 19.7 | 38.5 | 0 | 54.8 | extremo | 1 |
| 2022-10-15 | 2 | 16 | 32 | 19.6 | 27 | 17.1 | 32 | 0 | 45.8 | muy_alto | 1 |
| 2022-10-16 | 4 | 31 | 33.6 | 20.5 | 24 | 13.5 | 28.4 | 0 | 42.3 | muy_alto | 1 |
| 2022-10-17 | 2 | 24 | 35.4 | 21.7 | 25 | 14.3 | 28.1 | 0 | 43.3 | muy_alto | 1 |
| 2022-10-18 | 5 | 118 | 35.9 | 21.5 | 23 | 15.4 | 33.1 | 0 | 44.7 | muy_alto | 1 |
| 2022-10-19 | 4 | 241 | 35.1 | 22.2 | 23 | 19 | 36.4 | 0 | 48.8 | muy_alto | 1 |
| 2022-10-20 | 7 | 57 | 34.6 | 21.2 | 22 | 12.4 | 32.4 | 0 | 42 | muy_alto | 1 |
| 2022-10-21 | 1 | 21 | 35.6 | 21.5 | 26 | 14.7 | 31.3 | 0 | 44.6 | muy_alto | 0 |
| 2022-10-22 | 0 | 0 | 34.4 | 21.7 | 22 | 13.2 | 31.7 | 0 | 43.2 | muy_alto | 0 |
| 2022-10-23 | 0 | 0 | 35.3 | 22.6 | 27 | 16.1 | 33.5 | 0 | 46.2 | muy_alto | 0 |
| 2022-10-24 | 0 | 0 | 36 | 22.1 | 33 | 16.1 | 32 | 0.6 | 36.5 | alto | 0 |
| 2022-10-25 | 0 | 0 | 34.1 | 23.9 | 46 | 14.9 | 27.7 | 4.9 | 9.4 | bajo | 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
- 11,083ha
- GWIS perimeter (Copernicus)
- Duration
- 25days
- 26 Sept 2022 – 20 Oct 2022
- Municipalities hit
- 1
- districts
- Started on
- 26 Sept
- 2022
- Heat detections
- 489
- in a single hotspot: 419 MW
- Danger at start
- 47
- Very high · FWI index
- Average daily power
- 445MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
26 Sept20 Oct
21 Oct 2022
How it evolved, day by day
29 Sept
7 Oct
12 Oct
17 Oct
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
37°high
45km/h · peak gust
16%lowest humidity
It had gone 24 days without rain (1 mm or more) when it started. Rain came after the fire: 4.9 mm on 25 Oct.
This area had burned before
63% of the perimeter overlaps earlier fires recorded since 2016: 4,083 ha in 2016, 1,310 ha in 2017, 3,550 ha in 2018, 47 ha in 2019, 3,864 ha in 2020, 316 ha in 2021. Part of it burned more than once, so the yearly figures add up to more than the 6,996 ha that had burned before.
- 4,083 ha Marovoay fire, September 2016 14,296 ha in total; the hectares shown are those it shares with this fire
- 3,864 ha Ambato Boeni fire, October 2020 9,918 ha in total; the hectares shown are those it shares with this fire
- 3,550 ha Marovoay fire, September 2018 4,669 ha in total; the hectares shown are those it shares with this fire
- 316 ha Marovoay fire, September 2021 15,131 ha in total; the hectares shown are those it shares with this fire
- 225 ha Marovoay fire, September 2017 8,340 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
-
Marovoay where it started11,144 ha reached on 27 Sept2.0 %
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)
| Day | High | Min. humidity | Peak gust | Rain | Danger (FWI) |
|---|---|---|---|---|---|
| 26 Sept | 36.2 °C | 26 % | 42 km/h | 0.0 mm | Very high 47 |
| 27 Sept | 35.9 °C | 21 % | 41 km/h | 0.0 mm | Very high 47 |
| 28 Sept | 34.2 °C | 20 % | 41 km/h | 0.0 mm | Very high 50 |
| 29 Sept | 34.2 °C | 18 % | 37 km/h | 0.0 mm | Very high 49 |
| 30 Sept | 34.2 °C | 23 % | 34 km/h | 0.0 mm | Very high 42 |
| 1 Oct | 33.5 °C | 22 % | 31 km/h | 0.0 mm | Very high 41 |
| 2 Oct | 34.4 °C | 27 % | 36 km/h | 0.0 mm | Very high 44 |
| 3 Oct | 34.1 °C | 18 % | 31 km/h | 0.0 mm | Very high 43 |
| 4 Oct | 36.0 °C | 18 % | 31 km/h | 0.0 mm | Very high 45 |
| 5 Oct | 37.2 °C | 16 % | 30 km/h | 0.0 mm | Very high 44 |
| 6 Oct | 36.1 °C | 20 % | 32 km/h | 0.0 mm | Very high 48 |
| 7 Oct | 36.4 °C | 20 % | 43 km/h | 0.0 mm | Extreme 57 |
| 8 Oct | 34.8 °C | 22 % | 45 km/h | 0.0 mm | Extreme 56 |
| 9 Oct | 35.0 °C | 19 % | 44 km/h | 0.0 mm | Extreme 56 |
| 10 Oct | 35.5 °C | 21 % | 35 km/h | 0.0 mm | Extreme 52 |
| 11 Oct | 35.1 °C | 19 % | 30 km/h | 0.0 mm | Very high 45 |
| 12 Oct | 35.4 °C | 18 % | 32 km/h | 0.0 mm | Very high 50 |
| 13 Oct | 35.6 °C | 22 % | 44 km/h | 0.0 mm | Extreme 58 |
| 14 Oct | 35.0 °C | 19 % | 38 km/h | 0.0 mm | Extreme 55 |
| 15 Oct | 32.0 °C | 27 % | 32 km/h | 0.0 mm | Very high 46 |
| 16 Oct | 33.6 °C | 24 % | 28 km/h | 0.0 mm | Very high 42 |
| 17 Oct | 35.4 °C | 25 % | 28 km/h | 0.0 mm | Very high 43 |
| 18 Oct | 35.9 °C | 23 % | 33 km/h | 0.0 mm | Very high 45 |
| 19 Oct | 35.1 °C | 23 % | 36 km/h | 0.0 mm | Very high 49 |
| 20 Oct | 34.6 °C | 22 % | 32 km/h | 0.0 mm | Very high 42 |
| 21 Oct after | 35.6 °C | 26 % | 31 km/h | 0.0 mm | Very high 45 |
| 22 Oct after | 34.4 °C | 22 % | 32 km/h | 0.0 mm | Very high 43 |
| 23 Oct after | 35.3 °C | 27 % | 34 km/h | 0.0 mm | Very high 46 |
| 24 Oct after | 36.0 °C | 33 % | 32 km/h | 0.6 mm | High 36 |
| 25 Oct after | 34.1 °C | 46 % | 28 km/h | 4.9 mm | Low 9 |
Its twins: fires that started in the same weather
It started with an FWI of 46.8, a minimum humidity of 26% and 24 days without rain. Fires in the area that started in weather like this since 2016: 17.
FWI at the start
46.8
Minimum humidity
26 %
Days without rain
24
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Marovoay fire, September 2022
11,083 ha
25 days
FWI 46.8
Min. humidity 26 %
Antsohihy fire, October 2021
2,316 ha
4 days
FWI 45.2
Min. humidity 28 %
151 km away, in 2021
First rain (1 mm or more) after it ended: 2.4 mm on 8 Oct.
Besalampy fire, October 2018
3,546 ha
5 days
FWI 50.9
Min. humidity 26 %
234 km away, in 2018
First rain (1 mm or more) after it ended: none in the following ten days.
Antsohihy fire, October 2020
2,247 ha
19 days
FWI 47.8
Min. humidity 23 %
172 km away, in 2020
First rain (1 mm or more) after it ended: 1.1 mm on 20 Nov.
Ambato Boeni fire, September 2021
4,402 ha
8 days
FWI 43.5
Min. humidity 31 %
36 km away, in 2021
First rain (1 mm or more) after it ended: 1.0 mm on 7 Oct.
Port-Berge (Boriziny-Vaovao) fire, October 2020
4,380 ha
15 days
FWI 43.7
Min. humidity 27 %
138 km away, in 2020
First rain (1 mm or more) after it ended: 1.0 mm on 11 Nov.
What happened to them
- 6 days
- median duration
- 2,334 ha
- median area
- 100 %
- went past 1,000 ha
- 2.4 mm
- rain at the end (median; 13 of 17 had it)
It was 4.7 times larger than the median of its twins and lasted 25 days, against 6 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 4 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
4.9 mmfirst rain
25 Oct5 days after it ended
45km/h · max. gust
It was considered over on 20 Oct, and on 25 Oct 4.9 mm fell. We do not know whether the rain or the firefighters put it out. Twins with rain when they ended: 13 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 · 19 Sept 2022
After · 27 Oct 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 13 October 2022 the air beside the fire reached 26 µg/m³ of PM2.5, but no daily average passed the WHO guideline (15).
PM2.5 peak26 µg/m³
Days over the guideline0 days
PM1038 µg/m³
Optical depth0.71
WHO 15
25 Sept30 Sept5 Oct10 Oct15 Oct
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 · 489Every 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
- 4,669 haMarovoaySeptember 2018 · 14 days · 4 km away
- 9,918 haAmbato BoeniOctober 2020 · 17 days · 7 km away
- 35,515 haMarovoaySeptember 2025 · 55 days · 8 km away
- 14,296 haMarovoaySeptember 2016 · 19 days · 9 km away
- 15,131 haMarovoaySeptember 2021 · 17 days · 10 km away
- 8,340 haMarovoaySeptember 2017 · 13 days · 12 km away
Frequently asked questions
- How long did the Marovoay fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 26 September 2022 to 20 October 2022 (25 days). The perimeter dates it from 27 September 2022 to 16 October 2022.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 11,083 hectares (110.8 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Marovoay (11,144 ha, 2.0 %).
- What was the weather like?
- During the fire the temperature reached 37.2 °C, humidity dropped to 16 % and gusts hit 45 km/h. The fire danger index (FWI) reached 58, class Extreme.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Madagascar (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 6 days and their median area 2,334 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 4 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.
Satellite cross-check
History of this page · 2 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
- Last day with fire: 16 October 2022 → 20 October 2022.
- Start date: 27 September 2022 → 26 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 27 September 2022 to 16 October 2022. 489 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.