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Hog Trough Fire, July 2022 Ravalli, Granite

Out · last detection 19 Jul 2022, 21:38 UTC

The fire started on 18 July 2022 in Granite, United States, and satellites saw it burning for 1 day. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 728 hectares, spread across 2 counties.

It is the 220th largest in Montana since 2016 (of 302 with a page). Number 369 in United States in 2022, of 493.

Burnt area
728ha
official perimeter (MTBS / NIFC)
Duration
1day
18 Jul 2022 – 18 Jul 2022
Municipalities hit
2
counties
Started on
18 Jul
2022
Heat detections
85
in a single hotspot: 123 MW
Danger at start
24
High · FWI index
Energy released
652MW
sum of detected power

Where it burned

19 Jul 2022
HOTSPOTS BY DAY 18 Jul18 Jul

How it evolved, day by day

1819

Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.

The weather it burned in

26°high
70km/h · peak gust
14%lowest humidity

It had gone 2 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

  1. Ravalli
    518 ha reached on 18 Jul
    0.1 %
  2. Granite where it started
    208 ha reached on 19 Jul
    0.0 %

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)
18 Jul 17.1 °C 27 % 70 km/h 0.1 mm High 24
19 Jul after 23.1 °C 15 % 41 km/h 0.0 mm High 22
20 Jul after 25.1 °C 14 % 46 km/h 0.0 mm High 26
21 Jul after 25.5 °C 16 % 41 km/h 0.0 mm High 26
22 Jul after 22.1 °C 21 % 49 km/h 0.2 mm High 28
23 Jul after 24.2 °C 14 % 21 km/h 0.0 mm High 23
24 Jul after 21.1 °C 29 % 33 km/h 0.0 mm Moderate 21
25 Jul after 22.9 °C 25 % 31 km/h 0.0 mm High 22
26 Jul after 26.4 °C 23 % 28 km/h 0.0 mm High 23
27 Jul after 27.2 °C 22 % 31 km/h 0.0 mm High 24
28 Jul after 27.5 °C 20 % 23 km/h 0.0 mm High 24
29 Jul after 26.9 °C 16 % 35 km/h 0.0 mm High 30
30 Jul after 28.5 °C 14 % 25 km/h 0.0 mm High 30
31 Jul after 29.0 °C 14 % 51 km/h 0.0 mm Very high 39
1 Aug after 27.3 °C 17 % 49 km/h 0.0 mm High 37
2 Aug after 24.1 °C 18 % 56 km/h 0.0 mm Very high 41
3 Aug after 25.3 °C 17 % 54 km/h 0.0 mm Very high 40

Before and after, from space

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

Before · 11 Jul 2022
After · 25 Jul 2022

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 · 85Every 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 timeSatelliteFRP (MW)LatLon

Other fires nearby

All fires in United States ›

Frequently asked questions

How long did the Hog Trough fire last?
It burned between 18 July 2022 and 18 July 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 728 hectares (7.3 km²). Other tallies, such as daily incident reports, may give slightly different figures.
Which counties burned?
The fire entered 2 counties: Ravalli (518 ha, 0.1 %); Granite (208 ha, 0.0 %).
What was the weather like?
During the fire the temperature reached 25.5 °C, humidity dropped to 14 % and gusts hit 70 km/h. The fire danger index (FWI) reached 28, 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

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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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.

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.