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Flatt Fire, June 2021 Iron, Washington

Out · last detection 19 Jun 2021, 21:42 UTC

The fire started on 18 June 2021 in Iron, United States, and satellites saw it burning for 1 day. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 5,926 hectares, spread across 2 counties.

It is the 27th largest in Utah since 2016 (of 165 with a page). Number 77 in United States in 2021, of 385.

Burnt area
5,926ha
official perimeter (MTBS / NIFC)
Duration
1day
18 Jun 2021 – 18 Jun 2021
Municipalities hit
2
counties
Started on
18 Jun
2021
Heat detections
44
in a single hotspot: 127 MW
Danger at start
64
Extreme · FWI index
Energy released
1.2GW
sum of detected power

Where it burned

19 Jun 2021
HOTSPOTS BY DAY 18 Jun18 Jun

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

38°high
48km/h · peak gust
8%lowest humidity

It had gone 25 days without rain (1 mm or more) when it started. Rain came after the fire: 1.4 mm on 23 Jun.

This area had burned before

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

What happened to each town

  1. Iron where it started
    3,921 ha reached on 18 Jun
    0.5 %
  2. Washington
    1,997 ha reached on 19 Jun
    0.3 %

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 Jun 38.4 °C 8 % 39 km/h 0.0 mm Extreme 64
19 Jun after 36.9 °C 9 % 48 km/h 0.0 mm Extreme 67
20 Jun after 37.8 °C 7 % 40 km/h 0.0 mm Extreme 64
21 Jun after 34.5 °C 7 % 55 km/h 0.0 mm Very extreme 74
22 Jun after 31.7 °C 10 % 63 km/h 0.0 mm Very extreme 78
23 Jun after 26.8 °C 16 % 55 km/h 1.4 mm Very high 47

Before and after, from space

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

Before · 11 Jun 2021
After · 25 Jun 2021

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 · 44Every 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 Flatt fire last?
It burned between 18 June 2021 and 18 June 2021: 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 5,926 hectares (59.3 km²). Other tallies, such as daily incident reports, may give slightly different figures.
Which counties burned?
The fire entered 2 counties: Iron (3,921 ha, 0.5 %); Washington (1,997 ha, 0.3 %).
What was the weather like?
During the fire the temperature reached 38.4 °C, humidity dropped to 8 % and gusts hit 48 km/h. The fire danger index (FWI) reached 67, 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

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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What do you think is wrong?

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.