August 2020 California lightning wildfires

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August 2020 California lightning wildfires
August 2020 NASA-Terra-Smoke-Covered-California.jpg
NASA satellite image of the wildfires on August 24, 2020
Location California
Statistics [1]
Total fires650 [2]
Total areaOver 2,529,000 acres (1,023,450 ha) [2]
CostUnknown
Date(s)August 11, 2020 (2020-08-11) – January 5, 2021 (2021-01-05)
Cause Lightning
Buildings destroyed3,586+
Deaths23 [3]
Non-fatal injuries43
2020 Western U.S. wildfires
Western fires 2020.jpg
Multiple wildfires burning near the Pacific coast of the U.S. on September 9, 2020
Affected states
Background
Largest wildfire by state
  • Arizona - Bush (193,455 acres)
  • California - August Complex (1,032,648 acres)
  • Colorado - Cameron Peak (208,913 acres)
  • Nevada - Meadow Valley (59,265 acres)
  • New Mexico - Cub (25,950 acres)
  • Oregon - Santiam (402,274 acres)
  • Utah - East Fork (89,765 acres)
  • Washington - Pearl Hill (223,730 acres)

The August 2020 California lightning wildfires (also referred to as the August lightning siege or August wildfire siege) were a series of 650 wildfires that ignited across Northern California in mid-August 2020, due to a siege of dry lightning from rare, massive summer thunderstorms, which were caused by an unusual combination of very hot, dry air at the surface, dry fuels, and advection of moisture from the remains of Tropical Storm Fausto northward into the Bay Area. [4] [5] These fires burned between 1,500,000 acres (6,100 km2) to 2,100,000 acres (8,500 km2) within a 2–3 week period. The August 2020 lightning fires included three enormous wildfires: the SCU Lightning Complex, the August Complex, and the LNU Lightning Complex. On September 10, 2020, the August Complex set a record for the single-largest wildfire in the modern history of California, reaching a total area burned of 471,185 acres (1,907 km2). On September 11, the August Complex merged with the Elkhorn Fire, another massive wildfire of 255,039 acres (1,032 km2), turning the August Complex into a monster wildfire of 746,607 acres (3,021 km2). [6]

Contents

The three major Bay Area fires, the SCU, LNU, and the CZU Lightning Complex, collectively burned about 846,000 acres (3,420 km2) by mid-September 2020, destroyed 2,723 structures, and took 6 lives. [7]

Meteorological background

August 2020 began a record breaking season for wildfires. Of the twenty largest wildfires in California history, six were part of the 2020 wildfire season. Four of the new wildfires ranking in the top 10 were all a part of the August 2020 lightning fires. Cal Fire largest wildfires 2020.jpg
August 2020 began a record breaking season for wildfires. Of the twenty largest wildfires in California history, six were part of the 2020 wildfire season. Four of the new wildfires ranking in the top 10 were all a part of the August 2020 lightning fires.

Between August 14 and August 16, Northern California was subjected to record-breaking warm temperatures, [8] [9] [10] due to anomalously strong high pressure over the region. Early on August 15, the National Weather Service for San Francisco issued a Fire Weather Watch [11] highlighting the risk of wildfire starts due to the combination of lightning risk due to moist, unstable air aloft, dry fuels, and hot temperatures near the surface. Later that day, the Fire Weather Watch was upgraded to a Red Flag Warning, [12] noting the risk of abundant lightning already apparent as the storms moved toward the region from the south.

The source of this plume of moist, unstable air was the weakening Tropical Storm Fausto. Due to abnormal winds, this plume was streaming from up to 1,000 miles (1,600 km) off the coast of the Baja Peninsula into Northern California. This moisture then interacted with a high-pressure ridge situated over Nevada that was bringing a long-track heat wave to much of California and the West. [13] These colliding weather systems then created excessive atmospheric instability that generated massive thunderstorms throughout much of Northern and Central California. Such thunderstorms are rare for California, but were more typical of Midwest garden-variety storms, with one location near Travis Air Force Base going from around 80 °F (27 °C) to 100 °F (38 °C) in nearly 1–2 hours. [14] Additionally, much of these storms were only accompanied with dry lightning and produced little to no rain, making conditions very favorable for wildfires to spark and spread rapidly. [15]

Early morning on August 16, when the first thunderstorms hit, around 2,500 lightning strikes hit the Bay Area, with 200 strikes happening in 30 minutes at one point, which the National Weather Service office in Bay Area labelled as "insane". [16] Within the next 72–96 hours, over 12,000 lightning strikes were recorded over Northern California. These lightning strikes sparked up to 585 wildfires, many of which grew to be very large at a rapid pace due to parched brush, especially in Northern California. [13]

A second wave of thunderstorms was forecasted to hit on August 23 and 24; however, they failed to materialize over the Bay Area, which has been most impacted by these fires, and instead just produced light rain and a few lightning strikes over the Sierra Nevada, barely having any impact. [17]

Fires

Many of the fires were started or discovered on August 16 or 17:

NameCountyAcresStart dateContainment dateNotesRef
Wolf Tuolumne 2,057August 11November 20Lightning-sparked [18]
Lake Los Angeles 31,089August 12September 28Lightning-sparked, 33 structures destroyed; 6 damaged; 21 outbuildings destroyed; 2 injuries [19] [20] [21]
Hills Fresno 2,121August 15August 24Lightning-sparked; 1 fatality [22]
Loyalton Lassen, Plumas, Sierra 47,029August 15September 14Lightning-sparked, Caused National Weather Service to issue first ever Fire Tornado Warning; 5 homes, 6 outbuildings destroyed [23] [24]
River Monterey 48,088August 16September 4Caused by a lightning strike, 4 injuries [25]
Dome San Bernardino 43,273August 16September 14Caused by a lightning strike, burned in the Mojave National Preserve [26]
Beach Mono 3,780August 16August 28Caused by a lightning strike [27]
SCU Lightning Complex Santa Clara, Alameda, Contra Costa, San Joaquin, Merced, Stanislaus 396,624August 16October 1Deer Zone, Marsh, Canyon Zone and other surrounding fires combined into one multi-fire incident by CalFire; all believed to have been sparked by an intense and widespread lightning storm; 136 structures destroyed; 26 structures damaged; 5 injuries. [28]
August Complex Glenn, Mendocino, Lake, Tehama, Trinity 1,032,648August 16November 12Lightning strikes started 37 fires and the Elkhorn Fire, several of which grew to large sizes, especially the Doe Fire; the fire merged with the Elkhorn Fire on September 11, becoming the largest recorded wildfire in California history. 933 structures destroyed; 2 injuries; 1 fatality [29] [6]
CZU Lightning Complex San Mateo, Santa Cruz 86,509August 16September 22Several lightning-sparked fires burning close together across San Mateo and Santa Cruz Counties; 1,490 structures destroyed; 140 structures damaged; 1 injury; 1 fatality. [30]
Rattlesnake Tulare 8,419August 16December 29Lightning sparked a slow-growing fire in inaccessible terrain. [31]
LNU Lightning Complex Colusa, Lake, Napa, Sonoma, Solano, Yolo 363,220August 17October 2Multi-fire incident that includes the Hennessey Fire (305,651 acres), the Walbridge Fire (55,209 acres), and the Meyers Fire (2,360 acres) sparked by lightning; 1,491 structures destroyed; 232 structures damaged; 4 injuries; 6 fatalities. [32] It is the fifth-largest fire complex in California history. [33]
Butte/Tehama/Glenn Lightning Complex (Butte Zone) Butte 19,609August 17October 16Lightning sparked 34 fires throughout Butte County [34]
North Complex Plumas, Butte 318,935August 17December 4Lightning strikes, includes the Claremont Fire and the Bear Fire; 2,471 structures destroyed; 31 structures damaged; 16 fatalities; 13 injuries; It is the sixth-largest fire in modern California history. [35]
Jones Nevada 705August 17August 28Lightning sparked, 21 structures destroyed, 3 structures damaged, 7 injuries [36]
Sheep Plumas, Lassen 29,570August 17September 9Lightning-sparked, 26 structures destroyed, 1 injury [37] [38]
Salt Calaveras 1,789August 18August 24Lightning-sparked [39]
W-5 Cold Springs Lassen 84,817August 18September 14Lightning-sparked [40]
Carmel Monterey 6,905August 18September 4Lightning-sparked, 73 structures destroyed; 7 structures damaged [41]
Woodward Marin 4,929August 19October 2Lightning-sparked, 1,600 structures threatened [42]
SQF Complex Tulare 174,178August 19, 2020January 5, 2021Lightning-sparked, contains the Castle Fire (168,913 acres) and the Shotgun Fire (841 acres) [43]
Moc Tuolumne 2,857August 20August 30Lightning-sparked [44]
August 2020 California lightning wildfires
[Interactive fullscreen map]
Location of August 2020 wildfires

CZU Lightning Complex

The CZU lightning complex fire burns along Butano Ridge and in Pescadero Creek Park, in the Santa Cruz Mountains, California. Pictured here on 19 August, this fire would later grow to over 85,000 acres and destroy over 900 structures CZU lightning complex fire on Butano Ridge.jpg
The CZU lightning complex fire burns along Butano Ridge and in Pescadero Creek Park, in the Santa Cruz Mountains, California. Pictured here on 19 August, this fire would later grow to over 85,000 acres and destroy over 900 structures

By August 20, the fire had caused extensive damage to the Big Basin Redwoods State Park. The towns of Pescadero and La Honda were threatened by flames. [45]

LNU Lightning Complex

The LNU Lighting Complex was a complex of 7 different fires in the Sonoma, Lake, and Napa counties, with 4 major ones being the Hennessey, Gamble, 15-10, and 13-4 Fires. It first sparked around 6:37 AM on August 17, when a lightning storm passed over the Lake Hennessey area. Another lightning strike occurred at 6:39, near the Aonair winery, starting a fire that was 5 acres large. [46] About 60 fires had sparked in the region during that time period, however, while some blazes were quickly contained at 1 or 2 acres, others rapidly went out of control. Around 9 AM, dry, gale-force winds between 20 and 40 miles per hour helped to fan the flames of two uncontrolled blazes, the Gamble Fire and the Hennessey Fire. This caused the Hennessey Fire to explode to 2,400 acres (9.7 km2) by 5 PM August 17, prompting several evacuations. [47] By the night of August 18, the LNU complex had burned a total of 32,025 acres (129.60 km2) so far with no containment. 3 structures were destroyed, and the two biggest fires, the Hennessey and the Gamble Fires, both expanded to 10,000 acres (40 km2). [48] On August 19, the fire raced fast towards Vacaville, and caused hundreds of evacuations. Many people fled the city with only their basic necessities, with police officers and firefighters going door to door warning people to evacuate. [49] By August 20, the LNU fire had burned 215,000 acres (870 km2) and destroyed 480 structures. It forced the evacuation of some personnel in the Travis Air Force Base and the city of Healdsburg, California, that had already evacuated previously during the Tubbs Fire and the Kincade Fire. [45]

SCU Lightning Complex

The SCU Lightning Complex was a cluster of 20 different fires in the Santa Clara, Contra Costa, Alameda, Stanislaus, and San Joaquin counties, that was divided into 3 different zones - the Deer Zone, Calaveras Zone, and Canyon Zone. By August 18, the fires had expanded to over 35,000 acres (140 km2) with only 4 percent containment. [48] By August 20, the fire burned 140,000 acres (570 km2) and was 5% contained, evacuating people in the East San Jose foothills, [50] and threatening the Lick Observatory with flames. [45] On August 21, the SCU fire had exploded overnight by more than 40%, reaching a total of 230,000 acres (930 km2) and being 10% contained. [51]

Impacts

The North Complex fire's Bear Fire had destroyed the town of Berry Creek. The SCU Lightning Complex fires have threatened the cities of Fremont, Milpitas, Patterson, and San Jose, and also threatened Lick Observatory.

Evacuations

Air quality and smoke pollution

On September 9, 2020, the sky appeared orange across the Bay Area due to wildfire smoke.

See also

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References

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  44. ↑ "Moc Fire Information". fire.ca.gov. August 20, 2020.
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  48. 1 2 "Fires raging out of control in Bay Area prompt evacuations". KRON 4 News. August 18, 2020. Retrieved October 10, 2020.
  49. ↑ Fracassa, Dominic; Tucker, Jill (August 19, 2020). "Homes burn, residents flee for lives as lightning-sparked fire rages northwest of Vacaville". San Francisco Chronicle . Retrieved October 10, 2020.
  50. ↑ Jennifer, Wadsworth (August 20, 2020). "SCU Complex Grows to 140,000 Acres; Just 5 Percent Contained". San Jose Inside . Retrieved October 10, 2020.
  51. ↑ Wadsworth, Jennifer (August 21, 2020). "Overnight Growth Makes SCU Complex California's Biggest Fire". San Jose Inside . Retrieved October 10, 2020.
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