83-603: The 2021 Windy Fire was a large wildfire in the Sequoia National Forest in Central California 's Tulare County . Ignited by a lightning strike in the southern Sierra Nevada on September 9, the fire burned 97,528 acres (39,468 ha) over the course of a month, threatening communities like Ponderosa and Johnsondale . Multiple atmospheric rivers in October and November eventually subdued
166-570: A defensible space be maintained by clearing flammable materials within a prescribed distance from the structure. Communities in the Philippines also maintain fire lines 5 to 10 meters (16 to 33 ft) wide between the forest and their village, and patrol these lines during summer months or seasons of dry weather. Continued residential development in fire-prone areas and rebuilding structures destroyed by fires has been met with criticism. The ecological benefits of fire are often overridden by
249-469: A 15 mile radius. Additionally, Sensaio Tech , based in Brazil and Toronto, has released a sensor device that continuously monitors 14 different variables common in forests, ranging from soil temperature to salinity. This information is connected live back to clients through dashboard visualizations, while mobile notifications are provided regarding dangerous levels. Satellite and aerial monitoring through
332-470: A 24-hour fire day that begins at 10:00 a.m. due to the predictable increase in intensity resulting from the daytime warmth. Climate change promotes the type of weather that makes wildfires more likely. In some areas, an increase of wildfires has been attributed directly to climate change. Evidence from Earth's past also shows more fire in warmer periods. Climate change increases evapotranspiration . This can cause vegetation and soils to dry out. When
415-663: A benefit for people. Modern forest management often engages in prescribed burns to mitigate fire risk and promote natural forest cycles. However, controlled burns can turn into wildfires by mistake. Wildfires can be classified by cause of ignition, physical properties, combustible material present, and the effect of weather on the fire. Wildfire severity results from a combination of factors such as available fuels, physical setting, and weather. Climatic cycles with wet periods that create substantial fuels, followed by drought and heat, often precede severe wildfires. These cycles have been intensified by climate change . Wildfires are
498-809: A boardwalk at the Trail of 100 Giants, the Frog Meadow Guard Station, the Powder Horn and Speas Dirty Camp historic cabins, the Mule Peak Lookout and its radio repeater, and other outbuildings, storage sheds, and wooden bridges. The Mule Peak Lookout, established in 1935, was one of the last remaining fire lookouts in the Sequoia National Forest. The Windy Fire impacted eleven giant sequoia groves, comprising more than 1,735 acres (702 ha). On November 19, 2021,
581-485: A common type of disaster in some regions, including Siberia (Russia), California (United States), British Columbia (Canada), and Australia . Areas with Mediterranean climates or in the taiga biome are particularly susceptible. Wildfires can severely impact humans and their settlements. Effects include for example the direct health impacts of smoke and fire, as well as destruction of property (especially in wildland–urban interfaces ), and economic losses. There
664-610: A fire starts in an area with very dry vegetation, it can spread rapidly. Higher temperatures can also lengthen the fire season. This is the time of year in which severe wildfires are most likely, particularly in regions where snow is disappearing. Weather conditions are raising the risks of wildfires. But the total area burnt by wildfires has decreased. This is mostly because savanna has been converted to cropland , so there are fewer trees to burn. Climate variability including heat waves , droughts , and El Niño , and regional weather patterns, such as high-pressure ridges, can increase
747-727: A high severity. Smoke from the Windy and KNP Complex fires inundated large portions of California during late September and early October, largely affecting the San Joaquin Valley but occasionally impacting Southern California. Thick smoke in San Joaquin, Stanislaus, Merced, Madera, Fresno, Tulare, Kings, and Kern counties caused local high schools to cancel football games, and those with respiratory ailments were advised to remain indoors. Areas affected included Fresno , Bakersfield , Kernville , and Lake Isabella . On September 27,
830-546: A new fire detection tool is in operation at the U.S. Department of Agriculture (USDA) Forest Service (USFS) which uses data from the Suomi National Polar-orbiting Partnership (NPP) satellite to detect smaller fires in more detail than previous space-based products. The high-resolution data is used with a computer model to predict how a fire will change direction based on weather and land conditions. In 2014, an international campaign
913-415: A number expected to rise to 30,000 by 2050. The economic impact is also significant, with projected costs reaching $ 240 billion annually by 2050, surpassing other climate-related damages. Over the past century, wildfires have accounted for 20–25% of global carbon emissions, the remainder from human activities. Global carbon emissions from wildfires through August 2020 equaled the average annual emissions of
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#1732783125288996-545: A policy of allowing some wildfires to burn is the cheapest method and an ecologically appropriate policy for many forests, they tend not to take into account the economic value of resources that are consumed by the fire, especially merchantable timber. Some studies conclude that while fuels may also be removed by logging, such thinning treatments may not be effective at reducing fire severity under extreme weather conditions. Building codes in fire-prone areas typically require that structures be built of flame-resistant materials and
1079-503: A possible resolution to human operator error. These systems may be semi- or fully automated and employ systems based on the risk area and degree of human presence, as suggested by GIS data analyses. An integrated approach of multiple systems can be used to merge satellite data, aerial imagery, and personnel position via Global Positioning System (GPS) into a collective whole for near-realtime use by wireless Incident Command Centers . A small, high risk area that features thick vegetation,
1162-653: A procession of dry thunderstorms rolled across California. More than 1,100 cloud-to-ground lightning strikes were recorded in the state by the following morning, and associated rainfall was not enough to quench some of the small fires left in their wake. Eleven fires started in the Sequoia National Forest and the Giant Sequoia National Monument ). The Windy Fire began that night on the Tule River Indian Reservation . The National Interagency Coordination Center reported on
1245-531: A rapid forward rate of spread (FROS) when burning through dense uninterrupted fuels. They can move as fast as 10.8 kilometres per hour (6.7 mph) in forests and 22 kilometres per hour (14 mph) in grasslands. Wildfires can advance tangential to the main front to form a flanking front, or burn in the opposite direction of the main front by backing . They may also spread by jumping or spotting as winds and vertical convection columns carry firebrands (hot wood embers) and other burning materials through
1328-695: A remote site and sent via overnight mail to the fire manager . During the Yellowstone fires of 1988 , a data station was established in West Yellowstone , permitting the delivery of satellite-based fire information in approximately four hours. Public hotlines, fire lookouts in towers, and ground and aerial patrols can be used as a means of early detection of forest fires. However, accurate human observation may be limited by operator fatigue , time of day, time of year, and geographic location. Electronic systems have gained popularity in recent years as
1411-569: A strong human presence, or is close to a critical urban area can be monitored using a local sensor network . Detection systems may include wireless sensor networks that act as automated weather systems: detecting temperature, humidity, and smoke. These may be battery-powered, solar-powered, or tree-rechargeable : able to recharge their battery systems using the small electrical currents in plant material. Larger, medium-risk areas can be monitored by scanning towers that incorporate fixed cameras and sensors to detect smoke or additional factors such as
1494-779: A susceptible area: an ignition source is brought into contact with a combustible material such as vegetation that is subjected to enough heat and has an adequate supply of oxygen from the ambient air. A high moisture content usually prevents ignition and slows propagation, because higher temperatures are needed to evaporate any water in the material and heat the material to its fire point . Dense forests usually provide more shade, resulting in lower ambient temperatures and greater humidity , and are therefore less susceptible to wildfires. Less dense material such as grasses and leaves are easier to ignite because they contain less water than denser material such as branches and trunks. Plants continuously lose water by evapotranspiration , but water loss
1577-535: A total burned area of 43,745 acres (17,703 ha), stoked by the arrival of a dry air mass with attendant higher winds and lower humidity levels. The Forest Service closed more recreation sites in the Sequoia National Forest, primarily along the upper Kern River, on September 25. By September 29, the fire's advance to the south entered the burn scar from the 2016 Cedar Fire , limiting the fire activity there. On September 30, Forest Service smokejumpers , normally trained to climb trees to retrieve their parachutes, scaled
1660-424: A unified command is needed, incident commanders representing agencies or jurisdictions that share responsibility for the incident manage the response from a single incident command post . A unified command allows agencies with different legal, geographic, and functional authorities and responsibilities to work together effectively without affecting individual agency authority, responsibility, or accountability. Under
1743-448: Is also the potential for contamination of water and soil. At a global level, human practices have made the impacts of wildfire worse, with a doubling in land area burned by wildfires compared to natural levels. Humans have impacted wildfire through climate change (e.g. more intense heat waves and droughts ), land-use change , and wildfire suppression . The carbon released from wildfires can add to carbon dioxide concentrations in
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#17327831252881826-728: Is no longer an expectation, but the majority of wildfires are often extinguished before they grow out of control. While more than 99% of the 10,000 new wildfires each year are contained, escaped wildfires under extreme weather conditions are difficult to suppress without a change in the weather. Wildfires in Canada and the US burn an average of 54,500 square kilometers (13,000,000 acres) per year. Above all, fighting wildfires can become deadly. A wildfire's burning front may also change direction unexpectedly and jump across fire breaks. Intense heat and smoke can lead to disorientation and loss of appreciation of
1909-473: Is prone to offset errors, anywhere from 2 to 3 kilometers (1 to 2 mi) for MODIS and AVHRR data and up to 12 kilometers (7.5 mi) for GOES data. Satellites in geostationary orbits may become disabled, and satellites in polar orbits are often limited by their short window of observation time. Cloud cover and image resolution may also limit the effectiveness of satellite imagery. Global Forest Watch provides detailed daily updates on fire alerts. In 2015
1992-416: Is usually balanced by water absorbed from the soil, humidity, or rain. When this balance is not maintained, often as a consequence of droughts , plants dry out and are therefore more flammable. A wildfire front is the portion sustaining continuous flaming combustion, where unburned material meets active flames, or the smoldering transition between unburned and burned material. As the front approaches,
2075-675: Is variously recorded as November 10 by the National Interagency Coordination Center, November 11 by the National Park Service, and November 15 by Cal Fire; whichever the case, by that time the fire had not grown in size for over a month. The total cost of fighting the Windy Fire came to $ 78.4 million. The total burned area included more than 75,000 acres (30,000 ha) in Sequoia National Forest, more than 19,000 acres (7,700 ha) on
2158-692: The 2023 Canadian wildfires false claims of arson gained traction on social media; however, arson is generally not a main cause of wildfires in Canada. In California, generally 6–10% of wildfires annually are arson. Coal seam fires burn in the thousands around the world, such as those in Burning Mountain , New South Wales; Centralia , Pennsylvania; and several coal-sustained fires in China . They can also flare up unexpectedly and ignite nearby flammable material. (Fire) Good luck deleting this, Frost! (Fire) The spread of wildfires varies based on
2241-965: The Amazon rainforest . The fires in the latter were caused mainly by illegal logging . The smoke from the fires expanded on huge territory including major cities, dramatically reducing air quality. As of August 2020, the wildfires in that year were 13% worse than in 2019 due primarily to climate change , deforestation and agricultural burning. The Amazon rainforest 's existence is threatened by fires. Record-breaking wildfires in 2021 occurred in Turkey , Greece and Russia , thought to be linked to climate change. The carbon released from wildfires can add to greenhouse gas concentrations. Climate models do not yet fully reflect this feedback . Wildfires release large amounts of carbon dioxide, black and brown carbon particles, and ozone precursors such as volatile organic compounds and nitrogen oxides (NOx) into
2324-570: The Burned Area Emergency Response (BAER) team assigned to the Windy and KNP Complex fires released their report, which discussed a variety of fire impacts, post-fire hazards, and potential actions for response. Within the report, an analysis conducted by Nature Conservancy and National Park Service scientists used a combination of fire severity data, satellite imagery, aerial reconnaissance, and limited ground assessments to estimate possible large giant sequoia mortality from
2407-569: The European Union . In 2020, the carbon released by California's wildfires was significantly larger than the state's other carbon emissions. Forest fires in Indonesia in 1997 were estimated to have released between 0.81 and 2.57 giga tonnes (0.89 and 2.83 billion short tons ) of CO 2 into the atmosphere, which is between 13–40% of the annual global carbon dioxide emissions from burning fossil fuels. In June and July 2019, fires in
2490-480: The Fire Information for Resource Management System (FIRMS). Between 2022–2023, wildfires throughout North America prompted an uptake in the delivery and design of various technologies using artificial intelligence for early detection, prevention, and prediction of wildfires. Wildfire suppression depends on the technologies available in the area in which the wildfire occurs. In less developed nations
2573-747: The Forest Service and the Bureau of Indian Affairs . The fire impacted the Peyrone Grove of giant sequoias by September 13. On September 15, the Forest Service announced a closure order for part of the Sequoia National Forest, effective September 16 until December 31. Overnight, the fire exhibited "significant" spread: in the morning update on the fire for September 16, officials gave the Windy Fire's burned area as 3,924 acres (1,588 ha) and its containment at zero percent. That same day,
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2656-556: The Incident Command System , a unified command is an authority structure in which the role of incident commander is shared by two or more individuals, each already having authority in a different responding agency. Unified command is one way to carry out command in which responding agencies and/or jurisdictions with responsibility for the incident share incident management. A unified command may be needed for incidents involving multiple jurisdictions or agencies. If
2739-504: The Paris climate agreement . Due to the complex oxidative chemistry occurring during the transport of wildfire smoke in the atmosphere, the toxicity of emissions was indicated to increase over time. Atmospheric models suggest that these concentrations of sooty particles could increase absorption of incoming solar radiation during winter months by as much as 15%. The Amazon is estimated to hold around 90 billion tons of carbon. As of 2019,
2822-410: The dry season . In middle latitudes , the most common human causes of wildfires are equipment generating sparks (chainsaws, grinders, mowers, etc.), overhead power lines , and arson . Arson may account for over 20% of human caused fires. However, in the 2019–20 Australian bushfire season "an independent study found online bots and trolls exaggerating the role of arson in the fires." In
2905-463: The Arctic emitted more than 140 megatons of carbon dioxide, according to an analysis by CAMS. To put that into perspective this amounts to the same amount of carbon emitted by 36 million cars in a year. The recent wildfires and their massive CO 2 emissions mean that it will be important to take them into consideration when implementing measures for reaching greenhouse gas reduction targets accorded with
2988-564: The Bench Tree along the Trail of 100 Giants in order to extinguish flames in the canopy of an adjacent giant sequoia. On October 2, the evacuation orders for areas Sugarloaf Village, Panorama Heights, Poso Park, Idlewild, Pleasant View, Balance Rock, Posey and Vincent Ranch were reduced to evacuation warnings. Following the reduction, only 200 or so people remained under evacuation orders in all Tulare County. The decreased evacuations followed an increase in containment to 52 percent. But despite
3071-663: The KNP Complex Fire, the two wildfires are responsible for the death of 3–5 percent of the large sequoia population. The National Park Service's assessment highlighted an "alarming trend" given the previous large sequoia mortality from the Castle Fire in 2020—part of the SQF Complex fire—which killed an estimated 10–14 percent of large sequoias (or between 7,500 and 10,600 individual trees). The two mortality assessments suggest that in 2020 and 2021, 13–19 percent of
3154-589: The San Gabriel and San Bernardino mountains for multiple days. In August 2023, the California Department of Fish and Wildlife confirmed that the Windy Fire burn area had become home to a pack of at least five gray wolves , marking the species' first presence in the Sequoia National Forest since they were extirpated approximately 150 years prior. Researchers attributed the return to increased deer and other prey populations, which had benefited from
3237-592: The Sierra Nevada. The National Park Service estimated that the Windy Fire killed 900–1,300 large giant sequoias, part of a significant toll that high-severity wildfires have taken on the species in the 21st century. The KNP Complex Fire , which burned contemporaneously, burned 88,307 acres (35,737 ha) and killed up to 2,400 more large giant sequoias in Sequoia and Kings Canyon National Parks . The two fires are estimated to have killed as much as 3–5 percent of
3320-647: The Tule River Indian Reservation, and more than 1,000 acres (400 ha) each of BLM land and private land. National Forest infrastructure slowly resumed operation over the following months: the fire closure area was reduced in size on November 23, the Western Divide Highway reopened to through traffic on November 30, and the Trail of 100 Giants in Giant Sequoia National Monument reopened to
3403-505: The United States in the early 20th century and fires were reported using telephones, carrier pigeons , and heliographs . Aerial and land photography using instant cameras were used in the 1950s until infrared scanning was developed for fire detection in the 1960s. However, information analysis and delivery was often delayed by limitations in communication technology. Early satellite-derived fire analyses were hand-drawn on maps at
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3486-779: The Western US, earlier snowmelt and associated warming has also been associated with an increase in length and severity of the wildfire season, or the most fire-prone time of the year. A 2019 study indicates that the increase in fire risk in California may be partially attributable to human-induced climate change . In the summer of 1974–1975 (southern hemisphere), Australia suffered its worst recorded wildfire, when 15% of Australia's land mass suffered "extensive fire damage". Fires that summer burned up an estimated 117 million hectares (290 million acres ; 1,170,000 square kilometres ; 450,000 square miles ). In Australia,
3569-415: The Windy Fire as an example of a wildfire that experienced "significant overnight growth", representative of the climate change-driven increase of the vapor pressure deficit at night in the western United States since 1980. The vapor pressure deficit , a key meteorological variable that drives fire-conducive weather, reached record high levels in California during the Windy Fire. On the night of September 9,
3652-405: The Windy Fire. In total, the National Park Service report estimated that the Windy Fire killed between 931 and 1,257 large sequoias, defined as those over four feet (1.2 metres) in diameter. The estimate includes the sequoias killed outright as well as those expected to die in the three to five years following the fire. When combined with the estimated large sequoia mortality of 1,330–2,380 trees from
3735-435: The air over roads, rivers, and other barriers that may otherwise act as firebreaks . Torching and fires in tree canopies encourage spotting, and dry ground fuels around a wildfire are especially vulnerable to ignition from firebrands. Spotting can create spot fires as hot embers and firebrands ignite fuels downwind from the fire. In Australian bushfires , spot fires are known to occur as far as 20 kilometres (12 mi) from
3818-655: The air quality in Kernville to the southeast of the Windy Fire was the worst in the country, with an air quality index (AQI) of 437, well into the 'hazardous' level of health concern. At least once, north winds pushed smoke more than a hundred miles south. Dozens of people in the Los Angeles area called 911 to report the smoke and the South Coast Air Quality Management District issued a special air quality advisory for parts of
3901-732: The annual number of hot days (above 35 °C) and very hot days (above 40 °C) has increased significantly in many areas of the country since 1950. The country has always had bushfires but in 2019, the extent and ferocity of these fires increased dramatically. For the first time catastrophic bushfire conditions were declared for Greater Sydney. New South Wales and Queensland declared a state of emergency but fires were also burning in South Australia and Western Australia. In 2019, extreme heat and dryness caused massive wildfires in Siberia , Alaska , Canary Islands , Australia , and in
3984-470: The atmosphere and thus contribute to the greenhouse effect . This creates a climate change feedback . Naturally occurring wildfires can have beneficial effects on those ecosystems that have evolved with fire. In fact, many plant species depend on the effects of fire for growth and reproduction. The ignition of a fire takes place through either natural causes or human activity (deliberate or not). Natural occurrences that can ignite wildfires without
4067-444: The atmosphere. These emissions affect radiation, clouds, and climate on regional and even global scales. Wildfires also emit substantial amounts of semi-volatile organic species that can partition from the gas phase to form secondary organic aerosol (SOA) over hours to days after emission. In addition, the formation of the other pollutants as the air is transported can lead to harmful exposures for populations in regions far away from
4150-487: The century or so prior to the fire that she argued could have been managed for beneficial effects in the region's sequoia groves. As fuels built up from the accumulating effects of fire suppression, widespread conifer die-off also occurred between 2012 and 2016. Drought and bark beetle infestations joined forces to kill an "estimated 147 million trees" in California. California saw its second-driest water year ever in 2020–2021, exceeded in aridity only by that of 1923–1924. It
4233-476: The cooler perimeter, an area of high pressure remained over the fire area in early October, keeping the weather hot and dry, and supporting unusually vigorous fire activity at night. The Windy Fire's incident commander, Mark Morales, described conditions as "more like what you would observe in August: very dry with high temperatures and low humidity." Despite the conditions, the fire's last day with any growth recorded
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#17327831252884316-575: The course of fighting the Windy Fire; all were minor but one: a firefighter was taken to a Fresno hospital with second-degree burns on September 30. The fire caused zero fatalities. The National Interagency Coordination Center records that 128 structures were lost to the Windy Fire. Of those, 20 were residences, two were commercial buildings, and the remaining 106 were outbuildings. The destroyed residences included at least 14 homes in Sugarloaf Village. Destroyed Forest Service structures included
4399-604: The direction of the fire, which can make fires particularly dangerous. For example, during the 1949 Mann Gulch fire in Montana , United States, thirteen smokejumpers died when they lost their communication links, became disoriented, and were overtaken by the fire. In the Australian February 2009 Victorian bushfires , at least 173 people died and over 2,029 homes and 3,500 structures were lost when they became engulfed by wildfire. Unified command (ICS) In
4482-697: The earth's atmosphere has 415 parts per million of carbon, and the destruction of the Amazon would add about 38 parts per million. Some research has shown wildfire smoke can have a cooling effect. Research in 2007 stated that black carbon in snow changed temperature three times more than atmospheric carbon dioxide. As much as 94 percent of Arctic warming may be caused by dark carbon on snow that initiates melting. The dark carbon comes from fossil fuels burning, wood and other biofuels, and forest fires. Melting can occur even at low concentrations of dark carbon (below five parts per billion)". Wildfire prevention refers to
4565-411: The economic and safety benefits of protecting structures and human life. The demand for timely, high-quality fire information has increased in recent years. Fast and effective detection is a key factor in wildfire fighting. Early detection efforts were focused on early response, accurate results in both daytime and nighttime, and the ability to prioritize fire danger. Fire lookout towers were used in
4648-402: The fire front. Especially large wildfires may affect air currents in their immediate vicinities by the stack effect : air rises as it is heated, and large wildfires create powerful updrafts that will draw in new, cooler air from surrounding areas in thermal columns . Great vertical differences in temperature and humidity encourage pyrocumulus clouds , strong winds, and fire whirls with
4731-417: The fire heats both the surrounding air and woody material through convection and thermal radiation . First, wood is dried as water is vaporized at a temperature of 100 °C (212 °F). Next, the pyrolysis of wood at 230 °C (450 °F) releases flammable gases. Finally, wood can smolder at 380 °C (720 °F) or, when heated sufficiently, ignite at 590 °C (1,000 °F). Even before
4814-416: The fire stimulating increased grass growth. The table below shows how the fire grew in size and in containment during September and October in 2021. Acreage reflects, where possible, the figure reported in the daily morning update following overnight aerial infrared mapping of the fire. The graph runs from September 9, the day the fire began, until October 9, the last day where fire growth was reported (though
4897-673: The fire was not declared completely contained for more than a month afterward). Wildfire A wildfire , forest fire , or a bushfire is an unplanned, uncontrolled and unpredictable fire in an area of combustible vegetation . Depending on the type of vegetation present, a wildfire may be more specifically identified as a bushfire ( in Australia ), desert fire, grass fire, hill fire, peat fire, prairie fire, vegetation fire, or veld fire. Some natural forest ecosystems depend on wildfire. Wildfires are different from controlled or prescribed burning , which are carried out to provide
4980-412: The fire's burned area. The area's soil burn severity was mapped, with approximately 43 percent of it at unburned to low severity, 47 percent of it at moderate severity, and 10 percent of the area burned at a high soil burn severity. The Windy Fire also burned more than 93,000 acres (38,000 ha) of fisher habitat in conifer and hardwood forests, more than 43,000 acres (17,000 ha) of which burned at
5063-938: The fire's eastern flank crossed the Western Divide Highway and its southern flank reached the Long Meadow Grove of giant sequoias. The Forest Service increased the size of the National Forest closure area on September 20, citing the fire's recent and anticipated growth. At around 8:00 p.m. on September 22, the Tulare County Sheriff’s Office announced additional evacuation orders for the communities of Camp Nelson , Pierpoint , Coy Flat, Mountain Aire, Cedar Slope , Alpine Village , Rogers Camp, and Sequoia Crest . The fire grew by ~12,000 acres (4,856 ha) between September 22 and 23 for
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#17327831252885146-409: The fire, which was declared fully contained in mid-November. Total firefighting costs came to $ 78.4 million. The Windy Fire was the eight-largest fire of California's 2021 wildfire season . Though it destroyed 128 structures, the Windy Fire was also notable for its major impacts on the endangered giant sequoia population, which grows in less than a hundred natural groves on the western slopes of
5229-452: The flames of a wildfire arrive at a particular location, heat transfer from the wildfire front warms the air to 800 °C (1,470 °F), which pre-heats and dries flammable materials, causing materials to ignite faster and allowing the fire to spread faster. High-temperature and long-duration surface wildfires may encourage flashover or torching : the drying of tree canopies and their subsequent ignition from below. Wildfires have
5312-421: The flammable material present, its vertical arrangement and moisture content, and weather conditions. Fuel arrangement and density is governed in part by topography , as land shape determines factors such as available sunlight and water for plant growth. Overall, fire types can be generally characterized by their fuels as follows: Wildfires occur when all the necessary elements of a fire triangle come together in
5395-441: The force of tornadoes at speeds of more than 80 kilometres per hour (50 mph). Rapid rates of spread, prolific crowning or spotting, the presence of fire whirls, and strong convection columns signify extreme conditions. Intensity also increases during daytime hours. Burn rates of smoldering logs are up to five times greater during the day due to lower humidity, increased temperatures, and increased wind speeds. Sunlight warms
5478-454: The ground during the day which creates air currents that travel uphill. At night the land cools, creating air currents that travel downhill. Wildfires are fanned by these winds and often follow the air currents over hills and through valleys. Fires in Europe occur frequently during the hours of 12:00 p.m. and 2:00 p.m. Wildfire suppression operations in the United States revolve around
5561-495: The infrared signature of carbon dioxide produced by fires. Additional capabilities such as night vision , brightness detection, and color change detection may also be incorporated into sensor arrays . The Department of Natural Resources signed a contract with PanoAI for the installation of 360 degree 'rapid detection' cameras around the Pacific northwest, which are mounted on cell towers and are capable of 24/7 monitoring of
5644-477: The involvement of humans include lightning , volcanic eruptions , sparks from rock falls, and spontaneous combustions . Sources of human-caused fire may include arson, accidental ignition, or the uncontrolled use of fire in land-clearing and agriculture such as the slash-and-burn farming in Southeast Asia. In the tropics , farmers often practice the slash-and-burn method of clearing fields during
5727-406: The morning of September 11 that the Windy Fire had burned 115 acres (47 ha) in timber and brush, exhibiting "active fire behavior with uphill runs, backing and flanking". By 4:00 p.m. on September 12, the fire had burned onto the Sequoia National Forest, spreading to 450 acres (182 ha). California Incident Management Team 11 entered into unified command over the firefighting response with
5810-484: The preemptive methods aimed at reducing the risk of fires as well as lessening its severity and spread. Prevention techniques aim to manage air quality, maintain ecological balances, protect resources, and to affect future fires. Prevention policies must consider the role that humans play in wildfires, since, for example, 95% of forest fires in Europe are related to human involvement. Wildfire prevention programs around
5893-518: The public on May 13, 2022. In July 2022, the USFS reported multiple small holdover fires caused by smoldering giant sequoia trees, two of them from the Windy Fire the year before. The Cougar Fire in Red Hill Grove was contained at one acre (0.40 ha). The Crawford Fire, less than a half mile away, was contained at one-quarter acre (0.10 ha). At least four personnel sustained injuries in
5976-404: The risk and alter the behavior of wildfires dramatically. Years of high precipitation can produce rapid vegetation growth, which when followed by warmer periods can encourage more widespread fires and longer fire seasons. High temperatures dry out the fuel loads and make them more flammable, increasing tree mortality and posing significant risks to global forest health. Since the mid-1980s, in
6059-399: The techniques used can be as simple as throwing sand or beating the fire with sticks or palm fronds. In more advanced nations, the suppression methods vary due to increased technological capacity. Silver iodide can be used to encourage snow fall, while fire retardants and water can be dropped onto fires by unmanned aerial vehicles , planes , and helicopters . Complete fire suppression
6142-542: The total population of large giant sequoias. The Windy Fire primarily burned within the Giant Sequoia National Monument, a 328,315-acre (132,864 ha) protected portion of the Sequoia National Forest containing dozens of giant sequoia groves. The Windy Fire area saw many fewer fires in the period between 1970 and 2020 than occurred historically (prior to 1850). According to Christy Brigham, in charge of Resources Management and Science at Sequoia and Kings Canyon National Parks, more than fifty lightning fires were suppressed in
6225-936: The use of planes, helicopter, or UAVs can provide a wider view and may be sufficient to monitor very large, low risk areas. These more sophisticated systems employ GPS and aircraft-mounted infrared or high-resolution visible cameras to identify and target wildfires. Satellite-mounted sensors such as Envisat 's Advanced Along Track Scanning Radiometer and European Remote-Sensing Satellite 's Along-Track Scanning Radiometer can measure infrared radiation emitted by fires, identifying hot spots greater than 39 °C (102 °F). The National Oceanic and Atmospheric Administration 's Hazard Mapping System combines remote-sensing data from satellite sources such as Geostationary Operational Environmental Satellite (GOES), Moderate-Resolution Imaging Spectroradiometer (MODIS), and Advanced Very High Resolution Radiometer (AVHRR) for detection of fire and smoke plume locations. However, satellite detection
6308-411: The wildfires. While direct emissions of harmful pollutants can affect first responders and residents, wildfire smoke can also be transported over long distances and impact air quality across local, regional, and global scales. The health effects of wildfire smoke, such as worsening cardiovascular and respiratory conditions, extend beyond immediate exposure, contributing to nearly 16,000 annual deaths,
6391-519: The world may employ techniques such as wildland fire use (WFU) and prescribed or controlled burns . Wildland fire use refers to any fire of natural causes that is monitored but allowed to burn. Controlled burns are fires ignited by government agencies under less dangerous weather conditions. Other objectives can include maintenance of healthy forests, rangelands, and wetlands, and support of ecosystem diversity. Strategies for wildfire prevention, detection, control and suppression have varied over
6474-482: The world's large sequoia population was lost in just three wildfires. Prior to 2020, the total number of large sequoias within the groves of the Sierra Nevada was estimated at 75,580; the total number may have fallen to ~60,000 after the Castle, Windy, and KNP Complex fires. Land managers attributed the excessive toll to fuel loads and fire behavior too severe for the trees to tolerate, driven by climate change, drought, and
6557-466: The years. One common and inexpensive technique to reduce the risk of uncontrolled wildfires is controlled burning : intentionally igniting smaller less-intense fires to minimize the amount of flammable material available for a potential wildfire. Vegetation may be burned periodically to limit the accumulation of plants and other debris that may serve as fuel, while also maintaining high species diversity. While other people claim that controlled burns and
6640-399: The zealous suppression of wildfire in those areas for a hundred years or more. The following is a summary of all the groves that the Windy Fire impacted. High severity fire refers to that causing overstory mortality greater than 80 percent. Most of the giant sequoias in high severity fire areas were killed. A Forest Service burned area emergency response (BAER) assessment team evaluated
6723-435: Was October 9, one month after it had begun. By November 3, the fire was 92 percent contained. The remaining eight percent of uncontained perimeter, north of Cold Springs Creek and south of the Tule River Indian Reservation, lay in an area too difficult for ground personnel to access. It was left to burn itself out, under the supervision of aircraft, until the arrival of winter storms. The Windy Fire's precise date of containment
6806-794: Was organized in South Africa's Kruger National Park to validate fire detection products including the new VIIRS active fire data. In advance of that campaign, the Meraka Institute of the Council for Scientific and Industrial Research in Pretoria, South Africa, an early adopter of the VIIRS 375 m fire product, put it to use during several large wildfires in Kruger. Since 2021 NASA has provided active fire locations in near real-time via
6889-444: Was the driest ever water year on record for the southern Sierra Nevada in particular, with only 9.9 inches (25 cm) of rainfall compared to the region's average of 28.8 inches (73 cm). The summer of 2021 was also California's hottest ever recorded. The prolonged hot and dry conditions, courtesy of a high-pressure system that loitered over the state, contributed to a rash of significant wildfires. The Washington Post listed
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