How long did the Valmy Fire last?

It burned between 30 August 2017 and 30 August 2017: 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 2,235 hectares (22.4 km²). Other tallies, such as daily incident reports, may give slightly different figures.

Which counties burned?

The fire only entered Humboldt (2,228 ha, 0.1 %).

What was the weather like?

During the fire the temperature reached 33.2 °C, humidity dropped to 15 % and gusts hit 44 km/h. The fire danger index (FWI) reached 55, class Extreme.

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 · 2017-08-30 → 2017-08-30

Valmy Fire, August 2017 Humboldt

Out · last measured on 30 Aug 2017

The fire started on 30 August 2017 in Humboldt, United States, and satellites saw it burning for 1 day. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 2,235 hectares, spread across a single county.

It is the 105th largest in Nevada since 2016 (of 237 with a page). Number 240 in United States in 2017, of 619.

Compare with…

Suggestions: Izzenhood · 2016 Hot Pot · 2016 Sheep Creek · 2018 Dutch Flat · 2026

We have the official perimeter (MTBS / NIFC) for this fire, but the VIIRS sensors did not capture it in enough detail: no day-by-day evolution, but the split by county is there.

Burnt area: 2,235ha; official perimeter (MTBS / NIFC)
Duration: 1day; 30 Aug 2017 – 30 Aug 2017
Counties hit: 1; counties
Started on: 30 Aug; 2017
Danger at start: 55; Extreme · FWI index

The weather it burned in

33°high

44km/h · peak gust

15%lowest humidity

It had gone 35 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.

How big is it?

It burned the equivalent of 1.4% of the area of London (22 km² against 1,583 km²).

London boundary: geoBoundaries · Office for National Statistics (Open Government Licence v3.0).

This compares size, not location: both shapes are at the same scale, north up, centred on each other.

What happened to each county

Humboldt where it started

2,228 ha

0.1 %

Burnt area inside each county, from crossing the official 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.

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)
30 Aug	33.2 °C	15 %	44 km/h	0.0 mm	Extreme 55
31 Aug after	32.5 °C	14 %	26 km/h	0.0 mm	Very high 48
1 Sept after	34.8 °C	9 %	23 km/h	0.0 mm	Very high 49
2 Sept after	36.7 °C	8 %	20 km/h	0.0 mm	Very high 48
3 Sept after	38.1 °C	4 %	19 km/h	0.0 mm	Very high 50
4 Sept after	38.0 °C	6 %	29 km/h	0.0 mm	Extreme 56
5 Sept after	36.1 °C	9 %	18 km/h	0.0 mm	Extreme 55
6 Sept after	34.3 °C	7 %	28 km/h	0.0 mm	Extreme 60
7 Sept after	32.6 °C	12 %	33 km/h	0.0 mm	Extreme 56
8 Sept after	31.1 °C	15 %	43 km/h	0.2 mm	Extreme 58
9 Sept after	29.8 °C	19 %	24 km/h	0.0 mm	Very high 43

Before and after, from space

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

↔

Before · 23 Aug 2017

After · 6 Sept 2017

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.

Other fires nearby

All fires in United States ›

Frequently asked questions

How long did the Valmy Fire last?: It burned between 30 August 2017 and 30 August 2017: 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 2,235 hectares (22.4 km²). Other tallies, such as daily incident reports, may give slightly different figures.
Which counties burned?: The fire only entered Humboldt (2,228 ha, 0.1 %).
What was the weather like?: During the fire the temperature reached 33.2 °C, humidity dropped to 15 % and gusts hit 44 km/h. The fire danger index (FWI) reached 55, class Extreme.
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 · Emergency number and official warnings ›

Satellite cross-check

NASA FIRMS ↗
NIFC · Fire maps ↗

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

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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What really happened?

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We will only use your email to reply about this report. Privacy. This is not an emergency service: if there is a fire now, call 911.

How we know this

Perimeter: MTBS (US Geological Survey and US Forest Service), official.
Dates from the perimeter: the VIIRS detections inside it did not change them. No 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.

How we build fire pages: methodology ›

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