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Conner Fire, September 2018 Cassia

Out · last detection 23 Sept 2018, 09:29 UTC

The fire started on 22 September 2018 in Cassia, United States, and satellites saw it burning for 1 day. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 5,408 hectares, spread across a single county.

It is the 68th largest in Idaho since 2016 (of 379 with a page). Number 101 in United States in 2018, of 511.

Burnt area
5,408ha
official perimeter (MTBS / NIFC)
Duration
1day
22 Sept 2018 – 22 Sept 2018
Municipalities hit
1
counties
Started on
22 Sept
2018
Heat detections
143
in a single hotspot: 318 MW
Danger at start
45
Very high · FWI index
Energy released
8.8GW
sum of detected power

Where it burned

23 Sept 2018
HOTSPOTS BY DAY 22 Sept22 Sept

How it evolved, day by day

2223

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

The weather it burned in

29°high
48km/h · peak gust
9%lowest humidity

It had gone 25 days without rain (1 mm or more) when it started. Rain came after the fire: 12.0 mm on 4 Oct.

This area had burned before

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

What happened to each town

  1. Cassia where it started
    5,394 ha reached on 22 Sept
    0.8 %

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)
22 Sept 28.6 °C 9 % 40 km/h 0.0 mm Very high 45
23 Sept after 21.1 °C 19 % 46 km/h 0.0 mm Very high 40
24 Sept after 17.7 °C 16 % 48 km/h 0.0 mm Very high 42
25 Sept after 18.8 °C 17 % 26 km/h 0.0 mm High 35
26 Sept after 21.4 °C 11 % 35 km/h 0.0 mm High 38
27 Sept after 25.8 °C 13 % 41 km/h 0.0 mm Very high 41
28 Sept after 28.1 °C 12 % 37 km/h 0.0 mm Very high 39
29 Sept after 26.6 °C 14 % 37 km/h 0.0 mm Very high 41
30 Sept after 21.5 °C 14 % 45 km/h 0.0 mm Very high 41
1 Oct after 22.7 °C 18 % 36 km/h 0.0 mm Very high 40
2 Oct after 24.1 °C 21 % 42 km/h 0.4 mm Very high 39
3 Oct after 21.1 °C 34 % 38 km/h 0.0 mm High 32
4 Oct after 15.1 °C 60 % 41 km/h 12.0 mm Very low 0

Before and after, from space

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

Before · 15 Sept 2018
After · 29 Sept 2018

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 · 143Every 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 Conner fire last?
It burned between 22 September 2018 and 22 September 2018: 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 5,408 hectares (54.1 km²). Other tallies, such as daily incident reports, may give slightly different figures.
Which counties burned?
The fire only entered Cassia (5,394 ha, 0.8 %).
What was the weather like?
During the fire the temperature reached 28.6 °C, humidity dropped to 9 % and gusts hit 48 km/h. The fire danger index (FWI) reached 45, class Very 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.