Dixie Fire grows by 25,000 acres

Threatens Westwood and Chester

6:30 p.m. PDT August 14, 2021

Dixie Fire map NW Side
Dixie Fire map NW Side. The white line was the perimeter at 6:30 a.m. PDT Aug 14, 2021. The blue line was the perimeter 22 hours before. The yellow areas represent intense heat identified manually by the Infrared Analyst. Red dots are heat detected by a satellite at 1:51 p.m. PDT Aug. 14, 2021.

Here are some updated maps of the north half of the Dixie Fire. The south half is quiet.

Most of the fire activity Friday night and Saturday morning was:

  • Lassen Volcanic National Park;
  • Northeast and east of Chester;
  • South and southeast of Westwood;
  • West of Antelope Lake.
Dixie Fire map NE Side
Dixie Fire map NE Side. The white line was the perimeter at 6:30 a.m. PDT Aug 14, 2021. The blue line was the perimeter 22 hours before. The yellow areas represent intense heat identified manually by the Infrared Analyst. Red dots are heat detected by a satellite at 1:51 p.m. PDT Aug. 14, 2021.

Continue reading “Dixie Fire grows by 25,000 acres”

Dixie Fire grows to more than a half million acres

6:50 a.m. PDT August 12, 2021

Dixie Fire map NE Side -- 235 a.m. PDT Aug 12, 2021
Dixie Fire map, NE Side. The white line was the perimeter at 2:35 a.m. PDT Aug. 12, 2021. Yellow areas had intense fire. Red dots represent heat detected by a satellite at 2:17 a.m. PDT Aug. 12, 2021. The green line was the perimeter two days before.

An inversion remained over the Dixie Fire southwest of Susanville, California Wednesday and Wednesday night trapping the smoke and reducing visibility, but the blaze was still moderately active. Late in the afternoon fire in the Wilcox Valley 12 miles northeast of Greenville intensified, sending up a smoke column that broke through the inversion. The smoke above the inversion was then transported off to the northwest by upper level winds. Warm temperatures Wednesday night and minimal humidity recovery allowed the the fire to continue to spread.

A mapping flight late Wednesday night found that the fire had grown to 510,000 acres.

(To see all articles on Wildfire Today about the Dixie Fire, including the most recent, click HERE.)

In an update, the Incident Management Team said in areas where the fire has been stopped the large fuels on the ground, such as logs and stumps, will require a significant amount of resources to mop up due to the volume of fuels and the steep, rugged terrain.

Dixie Fire map
Dixie Fire map, NW Side. The white line was the perimeter at 2:35 a.m. PDT Aug. 12, 2021. Yellow areas had intense fire. Red dots represent heat detected by a satellite at 2:17 a.m. PDT Aug. 12, 2021. The green line was the perimeter two days before.

Aircraft initially working the fire Thursday morning will include 1 Very Large Air Tanker (DC-10), 2 Large Air Tankers, 2 Super Scoopers, 1 Lead Plane, 1 Air Attack aircraft, and approximately 20 helicopters.

Wednesday evening there were 6,133 personnel assigned to the incident, with 511 fire engines, 175 water tenders, 20 helicopters, 81 hand crews, and 198 dozers. The estimated suppression costs to date are $217 million. Nationwide there are over 25,000 personnel committed to wildland fires.

There is a chance Thursday for thunderstorms bringing very little rain with temperatures in the mid 90s to lower 100s and relative humidity in the lower teens. Winds will generally be out of the southwest in the afternoon with the exception of outflows generated by thunderstorms. The rest of the week should bring rising temperatures and dry conditions. Sustained southwest winds are expected to push the fire to the north and northeast.

Satellite photo of fires in OR, WA and CA
Satellite photo of fires in OR, WA and CA at 6:46 p.m. PDT Aug 11, 2021. The red areas indicate heat at fires detected by the satellite.

Firefighters battling to keep the Dixie Fire from spreading east

It is closing in on half a million acres.

7:49 a.m. PDT August 10, 2021

Dixie Fire map
Dixie Fire map. The red line was the perimeter at 9:45 p.m. PDT Aug 9, 2021. The yellow areas represent intense heat. Not all of the fire was mapped due to the massive smoke plume up to 22,000 feet.

The Dixie Fire was burning so vigorously at 9:45 Monday night that the smoke plume which had risen to 22,000 feet made it impossible for the small fixed wing mapping plane to obtain good imagery on the northern section of the fire.

North of Highway 36, firefighters are attempting to prevent the north end of the fire from moving east across the A21/A25 Mooney Road. Dozer lines have been constructed to reinforce the road but spot fires have still occurred east of the lines. That is the section of the fire that could not be mapped Monday night.

To see all articles on Wildfire Today about the Dixie Fire, including the most recent, click HERE.

CAL FIRE reported at 7 p.m. Monday that it had burned at least 482,000 acres. However, later fixed wing and satellite imagery indicates it was still growing into the night.

For the last two days the Dixie Fire has been working its way around the southwest tip of the 2020 Sheep Fire, 10 miles southwest of Susanville. On the south side of the Sheep Fire is the scar from the 2007 Moonlight Fire, where the diminished fuels have slowed the spread, but the north side has no recent fire history, resulting in greater fire activity on that side. Our map in an article from August 6 shows the footprint of the Moonlight Fire. The map at the top of this article shows a lighter color of vegetation where that fire burned 14 years ago.

The latest data from crews evaluating damage to infrastructure have found 873 destroyed structures. Maps are available showing the status of structures.

Smoke Monday morning was slow to dissipate, hampering the use of aircraft. In the afternoon wind from the southwest gusting to 20 mph thinned it out, and also increased the fire behavior.

The GOES 17 satellite image, below, shows that the fire was very active at 6:46 p.m. Monday. At that time it was just beginning to form pyrocumulus clouds which later grew, forming a line of condensation that reached to Nevada.

Satellite photo, smoke from fires in Oregon and Northern California
Satellite photo, smoke from fires in Oregon and Northern California at 6:46 p.m. PDT Aug 9, 2021.
Dixie Fire. Satellite photo
Dixie Fire. Satellite photo at 8:26 p.m. PDT Aug 9, showing pyrocumulus stretching to Nevada.

Judge orders PG&E to provide information about possible role in starting the Fly and Dixie Fires

The Fly Fire merged with the Dixie Fire which also appears to have been started by the company’s equipment

firefighters Dixie Fire
Firefighters near the site of a venting propane tank on the Dixie Fire. August 4, 2021. Jay Walter photo.

12:58 p.m. PDT August 8, 2021

The Washington Post reported August 7 that a federal judge ordered PG&E to explain the utility company’s role in starting the Dixie and Fly Fires. The official causes of the fires are still under investigation, but U.S. District Judge William Alsup asked the company in an order issued late Friday to give details, by August 16, about the equipment and vegetation in the area where the fires started. Alsup oversees PG&E’s criminal probation for felony convictions stemming from the deadly 2010 San Bruno gas pipeline explosion.

On July 18 Pacific Gas and Electric (PG&E) told the California Public Utilities Commission (PUC) that on July 13 the company’s equipment may have ignited the Dixie Fire which at 453,000 acres has grown to become the second largest single fire in the recorded history of California.

To see all articles on Wildfire Today about the Dixie Fire, including the most recent, click HERE.

PG&E also said in another filing with the PUC on August 2 that its equipment may also be to blame for starting the Fly fire which eventually merged with the Dixie fire.

The Fly Fire was reported Thursday, July 22 near Keddie in Butterfly Valley about four miles north of Quincy. At first there was a question whether it was a spot fire from the Dixie Fire several miles away, or if it was unrelated. A fire behavior analysis determined the spot fire possibility was unlikely.

PG&E said that at about 5:01 p.m. on July 22 activity on SmartMeters, a line recloser, and alarms reported a problem, and the Gansner 1101 circuit was deenergized. Later PG&E assisted the U.S. Forest Service with moving and examining a tree that was resting on a conductor on the circuit.

Somewhat slowed by smoke, Dixie Fire still spreads further east

6:53 p.m. PDT August 8, 2021

Dixie Fire map 255 p.m. PDT Aug 8, 2021
Map of the Dixie Fire. The white line was the perimeter at 9:58 p.m. PDT August 7, 2021. The red areas indicate intense heat or additional fire growth at 2:55 p.m. PDT August 8.

The wind across the Dixie Fire Sunday afternoon was stronger than it has been in several days. A weather station near Susanville recorded sustained 13 to 16 mph winds out of the southwest and west gusting at 19 to 24 mph. Combined with 12 percent relative humidity and very dry fuels the fire cranked up a head of steam and at 2:55 p.m. was mapped after spreading up to a mile east or northeast in the northeast section of the fire at the edge of the 2020 Sheep Fire.

There was little if any movement into the Sheep Fire footprint, but the Dixie Fire was active going around the corners. Presumably after the 2:55 p.m. flight, the limited spread around the edges of the Sheep Fire continued.

To see all articles on Wildfire Today about the Dixie Fire, including the most recent, click HERE.

At that time it was about 12 miles southwest of Susanville.

Sunday afternoon there was also additional fire spread northeast of Canyondam and northeast of Greenville. There was very limited fire movement in the northwest section of the fire seven miles northeast of Chester.

Maps are available showing the status of structures, and evacuations.

Satellite photo, fires in Northern California
Satellite photo, fires in Northern California, 5:41 p.m. PDT Aug 8, 2021.

The weather forecast indicates conditions favorable for additional fire growth through this week, with warmer temperatures and southwesterly winds.

Continue reading “Somewhat slowed by smoke, Dixie Fire still spreads further east”

Most of the vegetation in the Dixie Fire has not burned in more than 40 years

A look at the fire history

9:01 a.m. PDT August 6, 2021

History previous fires near Dixie Fire
History of fires in the vicinity of the Dixie Fire over the lat 23 years.

Most of area where the Dixie Fire has been burning has not been visited by fire within the last 40 years. There are roughly 100,000 acres of the 430,000-acre blaze that did burn in several fires between 2008 and 2012. This is the area in the center of the present footprint, that burned in the two to three weeks after it started July 14. Since then it has been spreading more quickly in very old vegetation.

To see all articles on Wildfire Today about the Dixie Fire, including the most recent, click HERE.

Generally the predominate wind direction is from the southwest, but wind events can come from other directions that can cause major growth. Thursday night the Dixie Fire was 13 miles southwest of Susanville, population about 15,000, but there are a number of old burns near the city that could slow the fire if it makes it that far. Closest to Susanville are two large fires from 2020, Sheep and Hog. Between them is the 2016 Willard Fire.


Update 7:44 a.m. PDT August 7, 2012

Dixie Fire History before 1980
Fire history in the area of the Dixie Fire before 1980. (Data from NIFC)

I added this map that shows the history of fires in the area of the Dixie Fire before 1980. It is unknown how complete this data from NIFC is, or how far back in time it goes.