Multiple fires merge in California’s North Bay area to burn over 215,000 acres

The LNU Lightning Complex of Fires is in Napa, Lake, Yolo, and Solano Counties

August 20, 2020  |  9:05 p.m. PDT

CAL FIRE says the LNU Lightning Complex of fires in the North Bay area of California has now burned 215,000 acres, up from the 131,000 acres announced by the agency Thursday morning. The number of structures destroyed on the complex has risen to 480.

Resources assigned to the fire include, according to CAL FIRE, 9 hand crews, 27 water tenders, 8 helicopters, 69 fire engines, and 28 dozers, for a total of 587 personnel. These are very low numbers for a fire that is closing in on a quarter of a million acres, and are indicative of how firefighting resources are having to be shared among the 367 fires that were found after the lighting bust in California. Many of those firefighters, some of whom are working double shifts, must be feeling the physical and mental strain of this battle that has been going on since Sunday when 72 hours of lighting began.

(To see all of the articles on Wildfire Today about the lightning-caused wildfires in California, including the most recent, click HERE.)

Resources are coming in from other states, and the U.S. Forest Service has increased the number of available large air tankers from 30 to 32 by bringing on two more military C-130 aircraft equipped with Modular Airborne Fire Fighting Systems (MAFFS). But aircraft can’t put out these fires driven by strong winds, very low humidity, dry vegetation, and near record heat. And smoke has at times decreased the visibility to the point where it was unsafe for them to fly.

Nationwide there are 416 hand crews, 1,507 fire engines, and 194 helicopters working on fires, for a total of 19,812 personnel. Incident Management teams committed in the U.S. include 13 Type 1 and 16 Type 2 teams; in California, 10 Type 1 and 5 Type 2 teams are assigned.


August 20, 2020  |  11:40 a.m. PDT

Map LNU Complex fire fires California Hennessey LNU Complex
Map of the wildfires in the LNU Lightning Complex of fires in California’s North Bay area, updated at 4 p.m. PDT August 19, 2020 by CAL FIRE.

At least seven large fires in California’s North Bay area have merged into one huge megafire. The Hennessey, Gamble, Green, Spanish, 5-10, Morgan, and Markley Fires are now one. It is 43 miles long, from the northeast corner of Yolo County, south across Napa County and into Solano County. The new merged fire is assuming the Hennessy Fire name and is being managed as part of the LNU Lightning Complex of fires that combined has covered 131,000 acres CAL FIRE said Wednesday. The number of acres may go up substantially later on Thursday as more current data is available.

CAL FIRE’s website has gone down at times Wednesday and Thursday, removing one source for critical information about the fire.

The agency said 105 structures (residences, commercial, and other) have been destroyed in the LNU Lightning Complex of fires.

A PG&E worker based in Vacaville died while assisting first responders, said company spokesperson John Kaufman. No further details were released.

A pilot was killed August 19 in the crash of a helicopter while working on the Hills Fire, approximately 9 miles south of the City of Coalinga.

Statewide in California there are 367 wildfires. Most of them started from the 10,800 lightning strikes during a 72-hour period that began Sunday. Shortages of aircraft and firefighters are hampering the suppression of the fires. The current dry, windy, and very hot weather conditions make control of any vegetation fire difficult even when an adequate number of resources are available. Some fires are not being immediately attacked by aircraft if they are a lower priority than another situation where lives are immediately threatened. Firefighters are being asked on some incidents to work back-to-back shifts.

Evacuations

Evacuation orders or warnings are in effect in Napa, Sonoma, and Lake counties. One way to keep up with the ever-changing list is the Twitter feed of CAL FIRE’s Sonoma-Lake-Napa Unit. An estimated 13,254 people have been told to evacuate in Napa County.

West of the fires several communities were evacuated Wednesday evening, including Angwin, Deer Park and other areas. The 50 patients that were at the 151-bed St. Helena Hospital northeast of St. Helena were ordered to be evacuated at about 7 p.m.

All non-essential personnel at Travis Air Force Base south of Vacaville were told Wednesday night to evacuate. They were ordered to not exit through the Main or Hospital Gates, but to instead use the North and South Gates.

Wednesday morning two strike teams of ambulances were mobilized in Fresno and Tulare counties in order to assist with the fires in Napa County. The two strike teams of five ambulances each will have a total of 10 paramedics and 10 EMTs with two paramedic supervisors. They were initially sent to Kaiser Permanente Medical Center in Vacaville. Edgar Escobedo, spokesman for American Ambulance, said their mission will be to respond and stand-by in the event of large-scale evacuations of medical facilities and to support emergency medical services and alternate care sites.

CAL FIRE’s video briefing about statewide fires, and the LNU Complex of fires

LNU Complex of fires -- briefing
LNU Complex of fires — briefing. ABC10.

At a briefing Wednesday the first minute and a half was about the statewide wildfire situation, then they moved on to details about the LNU Complex of fires in Napa, Lake, and Solano Counties of California.

(To see all of the articles on Wildfire Today about the lightning-caused wildfires in California, including the most recent, click HERE.)

Pine Gulch Fire creates lightning and pyrocumulus cloud

North of Grand Junction, Colorado

Lightning on the Pine Gulch Fire
Lightning on the Pine Gulch Fire at 12:47 a.m. MDT August 19, 2020. Image by Grand Junction NSW. White text and arrows added by Wildfire Today.

The Pine Gulch Fire 15 miles north of Grand Junction, Colorado created its own weather very early this morning. It took a combination of several factors, including low relative humidity, an unstable atmosphere, plenty of available fuels (vegetation), and strong outflow winds from a thunderstorm to the north that blew through the fire area between 10:20-10:30 p.m. This caused the fire to increase in intensity and the development of a very large pyrocumulus cloud over the smoke column that created lightning.

Here is the tweet from the National Weather Service that accompanied the image above:

lightning fire Grand Junction Pine Gulch

The Weather Service said the lightning lasted for hours and Grand Junction residents could hear the thunder.

Below is map of the fire showing the perimeter at 1:49 a.m MDT August 19, 2020.

map Pine Gulch Fire
The red line on the map was the perimeter of the Pine Gulch Fire at 1:58 a.m. MDT August 19, 2020. The white line was the perimeter three days before.

The Pine Gulch Fire grew by 37,899 acres on August 18, bringing size up to 125,108 acres.

The Garfield County Sheriff issued new evacuation orders for the northwest side of the Pine Gulch fire August 19.

  • From the Mesa County line north to the east/west Colorado Highway 256 (Four A Ridge Road) including north/south CO Hwy 256. 256/205 moving from pre-evacuation to full evacuation.
  • From Highway 139 Douglas Pass road east to the preexisting evacuation order for Carr Creek Road (207).
  • This includes CO Hwy 205 Salt Wash and Kimball Creek Road (202) on Kimball Mountain.
  • CO Hwy 258/King Road is evacuated.
Pine Gulch Fire
Pine Gulch Fire Tuesday night, August 18, 2020. InciWeb.

Hennessey Fire spreads south toward Vacaville

The LNU Complex of fires has burned tens of thousands of acres in Napa and Solano Counties in northern California

August 19, 2020  |  7:35 p.m. PDT

More evacuations have been ordered for the Hennessey and LNU Complex in northern California, this time in Napa County, including the St Helena Hospital and the communities of Angwin and Deer Park.


August 19, 2020  |  6:36 p.m. PDT

Fire jumps I-80

The Hennessey Fire has crossed Interstate 80 near Vacaville, California, prompting more evacuations. At about 5:15 p.m. @CAFireScanner reported that ground units said they had about 80 acres south of the Interstate and they would not be able to catch it without support from aviation.


August 19, 2020  |  12:58 p.m. PDT

LNU Complex fires Northern California evacuations Napa County

Official evacuation information for the LNU Complex of fires north of Vacaville is provided by @CALFIRELNU. Follow them on Twitter.

map fire Hennessey LNU Complex 1145 pm PDT August 18, 2020
Map of the fires in the LNU Complex in northern California. The data is from a privately owned aircraft and mapping system operated by Tenax Aerospace under an exclusive use contract with the U.S. Forest Service. The flight was at 11:45 p.m. PDT August 18, 2020. After the information was collected the fires spread substantially to the south and southeast. The red arrows were added by Wildfire Today indicating the direction of additional spread after the flight. There is high confidence in the accuracy of this mapping data, much more than heat data collected by satellites.

The map above of the fires in the LNU Complex in northern California is from a fixed wing mapping flight at 11:45 p.m. MDT August 18. After the flight the fires spread substantially to the south and southeast. The red arrows were added by Wildfire Today indicating the direction of additional spread after the flight. This is considered accurate data, much better than information collected by an orbiting satellite passing by hundreds of miles above the Earth. The limitation is that it is just a snapshot of one moment in time while the fires are spreading very rapidly, in some cases, into populated areas. This data is usually only available once a day in the middle of the night.

The mapping flight determined that at 11:45 p.m. Tuesday the size of the multiple fires in the Complex combined (Gamble, 15-10, Hennessey, and others) was 51,223 acres.

Continue reading “Hennessey Fire spreads south toward Vacaville”

Several large fires burning north of Napa, CA in Lake Berryessa area

Hennessey, Gamble, and 15-10 Fires

August 18, 2020  |  4:46 p.m. PDT

 LNU Complex Hennessey Gamble 15-10 fire
Map of the LNU Complex of fires at 2:36 a.m. PDT August 18, 2020.

Hennessey Fire

At least three large wildfires are spreading rapidly in northern California north of Napa. The Hennessey Fire is about 12 air miles north of Napa near the intersection of Highway 128 and Chiles Pope Valley Road. The last size provided by CAL FIRE (which could be many hours old) was 2,700 acres but it has grown substantially since then. Approximately 205 structures are threatened and evacuation orders are in place. At around 4 p.m. Tuesday there was a report that it had crossed to the south side of Highway 128 and was burning toward Atlas Peak. Three structures have been destroyed. Tuesday afternoon it was creating a large pyrocumulus cloud, indicating extreme fire behavior. An AlertWildfire camera captured the early hours of the fire including when a passing thunderstorm caused a rapid 180-degree shift in the wind direction and the spread of the fire.

(To see all of the articles on Wildfire Today about the lightning-caused wildfires in California, including the most recent, click HERE.)

Hennessey Fire August 18, 2020
Hennessey Fire August 18, 2020

15-10 Fire

There are two large fires near Lake Berryessa. The 15-10 Fire (the name will probably change) is along Berryessa Knoxville Road near the northwest shore of the lake. Tuesday at 2:36 a.m. it had burned approximately 1,000 acres according to sensors on a satellite, but it is very active Tuesday afternoon.

Gamble Fire

At 2:36 a.m. the south edge of the Gamble Fire was two miles north of the 15-10 Fire. At that time it had also burned approximately 1,000 acres according to sensors on a satellite, and it too was very active.

Evacuations are occurring for the 15-10 and Gamble Fires. With both fires burning along the Berryessa Knoxville Road, evacuation is complicated.

The photo below with four pyrocumulus clouds forming above the rapidly spreading fires is very impressive.

LNU Lightning Complex of fires
LNU Lightning Complex of fires August 18, 2020
LNU Lightning Complex of fires
LNU Lightning Complex of fires near Berryessa Lake, August 18, 2020

Time-lapse camera records moment a passing thunderstorm changes spread direction of Hennessey Fire

Napa County, California

August 18, 2020 | 2:25 p.m. PDT

Hennessey Fire 13 miles north of Napa, California, August 17, 2020. Screenshot from the video below. This shows the smoke after the wind shift.

A time-lapse camera at Atlas Peak in Napa County, California recorded the moment a wind shift caused by a passing thunderstorm August 17, 2020 suddenly changed the direction the Hennessey Fire was spreading.

If firefighters find themselves in a situation where thunderstorms could influence the wind direction on a fire, they should ensure they are in a safe location. A passing thunderstorm changed the wind direction on the Yarnell Hill Fire June 30, 2013 entrapping and killing 19 firefighters.

(To see all of the articles on Wildfire Today about the lightning-caused wildfires in California, including the most recent, click HERE.)

As of August 18 the Hennessey Fire has burned 2,700 acres; 205 structures are threatened and evacuation orders are in place. Three structures have been destroyed.

Anyone having trouble viewing the video can see it a YouTube.

Thanks go out to @bbdd333 who made the raw video footage available to us.