How long did the Henry fire last?

It burned between 25 June 2021 and 25 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 533 hectares (5.3 km²). Other tallies, such as daily incident reports, may give slightly different figures.

Which counties burned?

The fire only entered Alpine (529 ha, 0.3 %).

What was the weather like?

During the fire the temperature reached 30.0 °C, humidity dropped to 14 % and gusts hit 63 km/h. The fire danger index (FWI) reached 36, 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 · 2021-06-25 → 2021-06-25

Henry Fire, June 2021 Alpine

Out · last measured on 25 Jun 2021

The fire started on 25 June 2021 in Alpine, United States, and satellites saw it burning for 1 day. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 533 hectares, spread across a single county.

It is the 389th largest in California since 2016 (of 442 with a page). Number 339 in United States in 2021, of 385.

Burnt area: 533ha; official perimeter (MTBS / NIFC)
Duration: 1day; 25 Jun 2021 – 25 Jun 2021
Municipalities hit: 1; counties
Started on: 25 Jun; 2021
Heat detections: 158; in a single hotspot: 59 MW
Danger at start: 12; Moderate · FWI index

HOTSPOTS BY DAY 25 Jun25 Jun

The weather it burned in

30°high

63km/h · peak gust

14%lowest humidity

It had gone 0 days without rain (1 mm or more) when it started. Rain came after the fire: 1.0 mm on 27 Jul.

This area had burned before

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

What happened to each town

Alpine where it started

529 ha reached on 27 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)
25 Jun	23.2 °C	26 %	42 km/h	0.0 mm	Moderate 12
26 Jun after	27.2 °C	20 %	39 km/h	0.0 mm	High 23
27 Jun after	27.3 °C	25 %	31 km/h	0.0 mm	High 24
28 Jun after	28.4 °C	24 %	34 km/h	0.3 mm	High 25
29 Jun after	26.9 °C	24 %	41 km/h	1.9 mm	Moderate 15
30 Jun after	23.0 °C	32 %	40 km/h	3.5 mm	Very low 4
1 Jul after	24.2 °C	34 %	34 km/h	6.4 mm	Very low 2
2 Jul after	25.8 °C	29 %	32 km/h	4.5 mm	Very low 2
3 Jul after	24.1 °C	35 %	37 km/h	2.7 mm	Very low 2
4 Jul after	23.4 °C	26 %	42 km/h	0.0 mm	Low 11
5 Jul after	26.2 °C	31 %	32 km/h	1.5 mm	Low 8
6 Jul after	26.4 °C	27 %	39 km/h	0.2 mm	Moderate 17
7 Jul after	27.0 °C	22 %	50 km/h	0.0 mm	High 23
8 Jul after	27.5 °C	24 %	61 km/h	0.0 mm	High 26
9 Jul after	28.2 °C	25 %	35 km/h	0.3 mm	High 22
10 Jul after	30.0 °C	20 %	38 km/h	0.0 mm	High 27
11 Jul after	29.9 °C	22 %	48 km/h	1.1 mm	High 24
12 Jul after	29.1 °C	20 %	53 km/h	1.4 mm	High 23
13 Jul after	27.5 °C	21 %	63 km/h	0.3 mm	High 32
14 Jul after	26.6 °C	20 %	55 km/h	0.0 mm	High 32
15 Jul after	24.7 °C	18 %	56 km/h	0.0 mm	High 33
16 Jul after	25.5 °C	14 %	52 km/h	0.0 mm	High 36
17 Jul after	26.0 °C	20 %	49 km/h	0.1 mm	High 35
18 Jul after	26.0 °C	25 %	33 km/h	1.8 mm	Moderate 13
19 Jul after	24.0 °C	33 %	41 km/h	4.3 mm	Very low 4
20 Jul after	23.9 °C	31 %	47 km/h	0.2 mm	Moderate 15
21 Jul after	25.0 °C	19 %	48 km/h	0.0 mm	High 27
22 Jul after	25.2 °C	24 %	51 km/h	0.0 mm	High 28
23 Jul after	27.3 °C	23 %	30 km/h	0.0 mm	High 27
24 Jul after	27.7 °C	23 %	31 km/h	0.1 mm	High 28
25 Jul after	28.9 °C	23 %	22 km/h	0.7 mm	High 24
26 Jul after	25.6 °C	23 %	34 km/h	0.1 mm	High 28
27 Jul after	24.5 °C	20 %	52 km/h	1.0 mm	High 26

Before and after, from space

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

↔

Before · 18 Jun 2021

After · 2 Jul 2021

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.

Detections table · 158Every 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 Henry fire last?: It burned between 25 June 2021 and 25 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 533 hectares (5.3 km²). Other tallies, such as daily incident reports, may give slightly different figures.
Which counties burned?: The fire only entered Alpine (529 ha, 0.3 %).
What was the weather like?: During the fire the temperature reached 30.0 °C, humidity dropped to 14 % and gusts hit 63 km/h. The fire danger index (FWI) reached 36, 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