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| 2019–20 California wildfires | |
|---|---|
| Name | 2019–20 California wildfires |
| Caption | Satellite image of major California fires in 2020 near San Francisco, Los Angeles, and Sacramento |
| Location | California |
| Date | 2019–2020 |
| Area | 4,200,000 acres (approx.) |
| Cause | Pacific storm complex, power grid issues, climate change |
| Fatalities | Hundreds |
| Buildings | Tens of thousands |
2019–20 California wildfires
The 2019–20 California wildfires were a series of large, interconnected wildfire complexes and individual infernos across California that produced unprecedented burning, smoke, and disruption during the late 2019 and 2020 fire seasons. Driven by extreme drought, persistent Santa Ana winds, and prolonged heat linked to climate change, the season encompassed major conflagrations near population centers such as San Francisco, Los Angeles, Redding, Sacramento, and San Diego, and involved multiple state and federal agencies including the California Department of Forestry and Fire Protection, the United States Forest Service, and the Federal Emergency Management Agency.
Severe precipitation deficits from multi-year droughts in Sierra Nevada, intensified by a strong El Niño–Southern Oscillation phase and anomalous high-pressure ridging over the Pacific Ocean, created extremely dry fuels across Shasta County, Butte County, Sonoma County, Los Angeles County, and San Bernardino County. Warming linked to Intergovernmental Panel on Climate Change findings exacerbated fire weather and extended the fire season into traditionally cooler months, while aged infrastructure managed by Pacific Gas and Electric Company, Southern California Edison, and San Diego Gas & Electric contributed ignition risks that intersected with strong Santa Ana winds, dry thunderstorms associated with the North American Monsoon, and human activity in wildland-urban interface zones near Yosemite National Park, Sequoia National Forest, and Los Padres National Forest.
The 2019 portion included the Kincade Fire in Sonoma County and late-season fires in Los Angeles and Ventura County, while 2020 saw explosive growth during August and September with the August Complex fire, the SCU Lightning Complex, the LNU Lightning Complex, the CZU Lightning Complex, and the Glass Fire near Calistoga. In September 2020 the Dolan Fire and CZU Lightning Complex burned alongside the Creek Fire in Fresno County and the Bobcat Fire near Pasadena, producing widespread evacuations in Santa Cruz, Napa County, Plumas County, Trinity County, and Mendocino County. The August Complex fire became the largest recorded single complex in California history, overtaking previous seasons such as the 2018 California wildfires and aligning with international events like the 2019–20 Australian bushfire season in scale and media attention.
The season caused hundreds of fatalities and thousands of injuries, overwhelmed hospitals in Santa Clara County, Contra Costa County, and Riverside County, and damaged or destroyed tens of thousands of structures including residential neighborhoods in Paradise, California and commercial districts in Oxnard. Widespread air quality crises affected metropolitan regions including San Francisco Bay Area, Sacramento–San Joaquin River Delta, and Los Angeles Basin, prompting public health advisories from the California Department of Public Health, the Centers for Disease Control and Prevention, and local health officers in Alameda County, Marin County, and Sonoma County regarding particulate matter and smoke inhalation risks.
Ecosystems within Sierra Nevada, Klamath Mountains, Mendocino National Forest, and coastal ranges experienced severe canopy loss, soil destabilization, and altered watershed dynamics affecting the Sacramento River, San Joaquin River, and coastal estuaries near Monterey Bay. Emissions from burning vegetation and structures contributed to greenhouse gas loads, interacting with findings from National Aeronautics and Space Administration and National Oceanic and Atmospheric Administration satellite monitoring. The economic toll—measured by lost timber, tourism declines in regions such as Napa Valley, damage to infrastructure administered by Amtrak and Caltrans, and insurance losses handled by firms like State Farm—totaled tens of billions of dollars and affected labor markets in San Joaquin County, Imperial County, and Kern County.
Fire suppression involved coordinated operations by Cal Fire, the United States Forest Service, the Bureau of Land Management, and mutual aid from municipal departments in San Diego Fire-Rescue Department, Los Angeles Fire Department, and volunteer brigades organized through Community Emergency Response Team (CERT). Aerial resources included tanker support contracted from Cascade Air and helicopter operations coordinated with the California Office of Emergency Services and aided by logistical staging at Moffett Federal Airfield and Napa County Airport. Incident management teams applied unified command structures from the National Incident Management System while challenges arose from concurrent lightning-caused ignitions tied to a widespread dry lightning event and staffing shortages exacerbated by the COVID-19 pandemic’s strain on emergency logistics and sheltering in counties like Orange County and San Mateo County.
Post-fire recovery engaged federal programs from FEMA and state initiatives led by California Natural Resources Agency to fund debris removal, rebuilding, and hazard mitigation in hard-hit communities such as Paradise and Kincade Fire area neighborhoods in Healdsburg. Restoration projects addressed erosion control, reforestation in Sierra National Forest, and habitat rehabilitation for species protected under the Endangered Species Act in regions like Ventura County and Monterey County. Legal and insurance disputes involved the Public Utilities Commission (California) and major utilities including Pacific Gas and Electric Company, prompting settlements and litigation over liability for ignition events that affected recovery timelines in Butte County and Lake County.
Policy responses included expanded fuels management funded by the California Climate Investments program, revised transmission line clearance protocols overseen by the California Public Utilities Commission, accelerated prescribed fire initiatives coordinated with the National Park Service at Yosemite National Park and tribal governments such as the Yurok and Karuk nations, and investments in grid hardening and microgrid projects in Sonoma County and Mendocino County. Legislative action in the California State Legislature revised liability frameworks, increased funding for community resilience grants administered by the Governor's Office of Emergency Services, and updated building codes affecting development in wildland-urban interface zones across Sacramento, Fresno, and Los Angeles counties.
Category:Wildfires in California Category:2019 wildfires Category:2020 wildfires