How long did the Ammon fire last?

It burned between 5 August 2022 and 5 August 2022: 1 day, according to the start date recorded by United States agencies (MTBS / NIFC) and the heat detections seen by satellite.

How much area did it burn?

The official perimeter published by United States agencies (MTBS / NIFC) is 4,660 hectares (46.6 km²). Other tallies, such as daily incident reports, may give slightly different figures.

Which counties burned?

The fire only entered Humboldt (4,674 ha, 0.5 %).

What was the weather like?

During the fire the temperature reached 31.3 °C, humidity dropped to 34 % and gusts hit 44 km/h. The fire danger index (FWI) reached 25, class High.

Where does this data come from?

From the official burnt perimeter of United States agencies (MTBS / NIFC, public domain), NASA FIRMS VIIRS hotspots and the administrative boundaries of United States. It is not an official report.

US · United States · 2022-08-05 → 2022-08-05

Ammon Fire, August 2022 Humboldt

Out · last measured on 5 Aug 2022

The fire started on 5 August 2022 in Humboldt, United States, and satellites saw it burning for 1 day. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 4,660 hectares, spread across a single county.

It is the 137th largest in California since 2016 (of 442 with a page). Number 106 in United States in 2022, of 493.

Burnt area: 4,660ha; official perimeter (MTBS / NIFC)
Duration: 1day; 5 Aug 2022 – 5 Aug 2022
Municipalities hit: 1; counties
Started on: 5 Aug; 2022
Heat detections: 297; in a single hotspot: 43 MW
Danger at start: 19; Moderate · FWI index

HOTSPOTS BY DAY 5 Aug5 Aug

The weather it burned in

31°high

44km/h · peak gust

34%lowest humidity

It had gone 3 days without rain (1 mm or more) when it started.

This area had burned before

No earlier perimeters overlap this fire since 2016, when the satellite record begins.

What happened to each town

Humboldt where it started

4,674 ha reached on 11 Aug

0.5 %

Burnt area inside each county, from crossing the official perimeter with administrative boundaries. The distance is from the town centre to the nearest fire: staying a kilometre away does not mean it reached the houses.

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)
5 Aug	25.6 °C	53 %	32 km/h	0.3 mm	Moderate 19
6 Aug after	25.0 °C	55 %	34 km/h	0.0 mm	Moderate 19
7 Aug after	25.4 °C	49 %	32 km/h	0.0 mm	Moderate 19
8 Aug after	24.1 °C	52 %	33 km/h	0.0 mm	Moderate 19
9 Aug after	23.4 °C	50 %	40 km/h	0.0 mm	Moderate 20
10 Aug after	23.5 °C	43 %	36 km/h	0.0 mm	Moderate 20
11 Aug after	23.5 °C	50 %	36 km/h	0.0 mm	Moderate 20
12 Aug after	22.3 °C	48 %	38 km/h	0.0 mm	Moderate 20
13 Aug after	23.6 °C	42 %	44 km/h	0.0 mm	High 21
14 Aug after	24.2 °C	45 %	42 km/h	0.0 mm	Moderate 21
15 Aug after	24.3 °C	46 %	44 km/h	0.0 mm	High 22
16 Aug after	28.9 °C	37 %	33 km/h	0.0 mm	High 23
17 Aug after	31.3 °C	34 %	31 km/h	0.0 mm	High 25
18 Aug after	26.6 °C	47 %	30 km/h	0.0 mm	High 23
19 Aug after	24.4 °C	47 %	41 km/h	0.0 mm	High 24
20 Aug after	26.6 °C	41 %	39 km/h	0.0 mm	High 23
21 Aug after	26.9 °C	38 %	40 km/h	0.0 mm	High 24
22 Aug after	23.7 °C	49 %	40 km/h	0.0 mm	High 23
23 Aug after	24.9 °C	48 %	38 km/h	0.0 mm	High 22
24 Aug after	26.9 °C	47 %	36 km/h	0.0 mm	High 22
25 Aug after	28.3 °C	40 %	34 km/h	0.0 mm	High 23
26 Aug after	26.8 °C	49 %	40 km/h	0.0 mm	High 23
27 Aug after	24.1 °C	52 %	39 km/h	0.0 mm	High 22
28 Aug after	27.0 °C	44 %	32 km/h	0.0 mm	Moderate 20
29 Aug after	28.6 °C	38 %	30 km/h	0.0 mm	High 23
30 Aug after	28.5 °C	36 %	31 km/h	0.0 mm	High 24
31 Aug after	27.0 °C	39 %	29 km/h	0.0 mm	High 24
1 Sept after	27.7 °C	32 %	31 km/h	0.0 mm	High 25
2 Sept after	25.1 °C	43 %	31 km/h	0.0 mm	High 24
3 Sept after	23.3 °C	43 %	40 km/h	0.0 mm	High 26
4 Sept after	26.7 °C	34 %	39 km/h	0.0 mm	High 27
5 Sept after	30.6 °C	31 %	30 km/h	0.0 mm	High 27
6 Sept after	35.1 °C	23 %	27 km/h	0.0 mm	High 34

Before and after, from space

Drag the line to compare the same ground before the fire and after it.

↔

Before · 29 Jul 2022

After · 12 Aug 2022

Before After

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 · Copernicus

On 8 August 2022 the air beside the fire reached 188 µg/m³ of PM2.5. That day averaged 131: 8.8 times the WHO daily guideline (15).

PM2.5 peak188 µg/m³

Days over the guideline3 days

PM10269 µg/m³

Optical depth1.22

WHO 15

45678

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 · 297Every 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

All fires in United States ›

Frequently asked questions

How long did the Ammon fire last?: It burned between 5 August 2022 and 5 August 2022: 1 day, according to the start date recorded by United States agencies (MTBS / NIFC) and the heat detections seen by satellite.
How much area did it burn?: The official perimeter published by United States agencies (MTBS / NIFC) is 4,660 hectares (46.6 km²). Other tallies, such as daily incident reports, may give slightly different figures.
Which counties burned?: The fire only entered Humboldt (4,674 ha, 0.5 %).
What was the weather like?: During the fire the temperature reached 31.3 °C, humidity dropped to 34 % and gusts hit 44 km/h. The fire danger index (FWI) reached 25, class High.
Where does this data come from?: From the official burnt perimeter of United States agencies (MTBS / NIFC, public domain), NASA FIRMS VIIRS hotspots and the administrative boundaries of United States. It is not an official report.

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

Satellite cross-check

NASA FIRMS ↗
NIFC · Fire maps ↗

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.

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Where this data comes from

The perimeter is official and in the public domain. For past years it comes from MTBS (Monitoring Trends in Burn Severity), run by the U.S. Geological Survey and the USDA Forest Service, which map it on Landsat and Sentinel-2 imagery. For the current and last year it comes from WFIGS at the National Interagency Fire Center (NIFC): incident perimeters mapped by fire crews, aircraft and imagery. Heat detections come from the VIIRS sensors aboard Suomi-NPP and NOAA-20, distributed by NASA FIRMS at 375 m resolution. County boundaries come from geoBoundaries ADM2 (Public Domain). The area per county is computed by WorldFires by crossing the perimeter with those boundaries, so it may differ slightly from official figures.

Where it burned