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112-639: The 2012 Reading Fire was a large wildfire in Lassen Volcanic National Park and the Lassen National Forest in Northern California . Ignited by a lightning strike on July 23, the fire was managed for ecological benefits by park officials until shifts in the weather caused the fire to jump its intended control lines. The Reading Fire ultimately burned 28,079 acres (11,363 hectares), partially outside

224-570: 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

336-469: 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

448-470: 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

560-451: A back fire is the term given to the process of lighting vegetation in such a way that it has to burn against the prevailing wind. This produces a slower moving and more controllable fire. Controlled burns utilize back burning during planned fire events to create a "black line" where fire cannot burn through. Back burning or backfiring is also done to stop a wildfire that is already in progress. Firebreaks are also used as an anchor point to start

672-663: 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

784-485: 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

896-528: A dearth of dense vegetation, a cooler northern slope, ridges and roads at which to limit fire spread, etc.), the personnel at the scene concluded the area was potentially conducive to a managed wildfire and deferred the decision of whether to extinguish the fire or not to the following day. On July 24, park personnel conversed among themselves and with experts (including the National Park Service’s regional fire ecologist) before receiving permission from

1008-610: 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

1120-402: A fuel ladder and begin an active crown fire . Predictions show thinned forests lead to a reduction in fire intensity and flame lengths of forest fires compared to untouched or fire-proofed areas. Aerial ignition is a type of controlled burn where incendiary devices are released from aircraft. There are two basic causes of wildfires . One is natural, mainly through lightning, and the other

1232-429: A line of fires along natural or man-made features such as a river, road or a bulldozed clearing. Head fires, that burn with the prevailing wind, are used between two firebreaks because head fires will burn more intensely and move faster than a back burn. Head fires are used when a back burn would move too slowly through the fuel either because the fuel moisture is high or the wind speed is low. Another method to increase

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1344-553: A long-term cumulative reduction in greenhouse gas emissions. One working example is the West Arnhem Fire Management Agreement, started to bring "strategic fire management across 28,000 square kilometres (11,000 sq mi) of Western Arnhem Land" to partially offset greenhouse gas emissions from a liquefied natural gas plant in Darwin , Australia. Deliberately starting controlled burns early in

1456-476: A member of the Forest Service hiked in to the fire, directed by a reconnaissance aircraft. At that point, late in the day, the fire had hardly expanded beyond the lone red fir tree and its behavior was subdued—a later report described the fire at this point as being three feet (0.91 m) by five feet (1.5 m) and "smoldering". After evaluating local topographical features and other conditions (such as

1568-406: A moderate-to-high soil burn severity and 51 percent low to unburned soil burn severity. A preliminary report found that 30 percent of the fire's footprint recorded a moderate vegetation burn severity, and 35 percent recorded a high vegetation burn severity. Park staff reported that "pretty good regeneration" had already begun in the predicted areas by June of 2013. Following a request by members of

1680-546: 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

1792-415: 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

1904-545: 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

2016-503: 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,

2128-531: 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

2240-695: 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

2352-558: A single red fir tree on a north-facing slope, at about 7,100 ft (2,200 metres) in elevation, and ignited it at approximately 5:09 p.m. PDT . The ignition point was located in a designated wilderness area, approximately one mile (1.6 kilometres) northeast of Paradise Meadows and 2.5 miles (4.0 km) east of Lassen Peak , south of the Lassen National Park Highway . The fire was named for Reading Peak, which lay nearby. A park fire management officer and

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2464-515: A spot fire was detected just four miles (6.4 km) south of Old Station . Firefighters began conducting burning operations "day and night" to halt the fire's spread. On August 17th the fire's growth was "minimal" and confined to its eastern and southern flanks, remaining four miles (6.4 km) from Old Station. Aircraft continued to drop fire retardant on the eastern edge, aiding ground crews constructing fire lines near Twin Lakes. Firefighters held

2576-569: 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

2688-779: 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

2800-406: A unique evolution with fire, quickly replacing damaged buds or stems in the case of danger . They also carry their seeds in capsules which can be deposited at any time of the year . During a wildfire, the capsules drop nearly all of their seeds and the fire consumes the eucalypt adults, but most of the seeds survive using the ash as a source of nutrients. At their rate of growth, they quickly dominate

2912-482: A way that benefited humans and wildlife in forests and grasslands by starting low-intensity fires that released nutrients for plants, reduced competition for cultivated species, and consumed excess flammable material that otherwise would eventually fuel high-intensity, catastrophic fires. The use of controlled burns in North America ended in the early 20th century, when federal fire policies were enacted with

3024-627: A wick at the end that is used to ignite the lines of fire. Safe zones are established to ensure personnel know where the fire cannot cross either because of natural barriers like bodies of water or human-made barriers like tilled earth. During ignition, the Burn Boss relays information about the fire (flame length, flame height, the percent of ground that has been blackened) to the Communications Officer who documents this information. The Communications Officer relays information about

3136-449: Is a land management tool. Fire was a part of the landscapes of Ontario until early colonial rule restricted indigenous culture in across Canada. During colonization, large scale forest fires were caused by sparks from railroads and fire was used to clear land for agriculture use. The public perception of forest fires was positive because the cleared land represented taming the wilderness to an urban populace. The conservation movement, which

3248-448: 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

3360-471: Is human activity. Controlled burns have a long history in wildland management. Fire has been used by humans to clear land since the Neolithic period. Fire history studies have documented regular wildland fires ignited by indigenous peoples in North America and Australia prior to the establishment of colonial law and fire suppression. Native Americans frequently used fire to manage natural environments in

3472-728: 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

Reading Fire - Misplaced Pages Continue

3584-522: Is now Lassen Volcanic National Park with a return interval of between five and 15 years, and with mixed severities. This baseline changed dramatically beginning in 1905, when fire suppression efforts began in earnest. The new fire regime lasted until park policy changed in the 1980s, and Lassen Volcanic National Park began managing lightning-ignited fires for their ecological benefits within the Lassen Volcanic Wilderness. Wildfires in

3696-473: 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

3808-501: Is seen as one component of shifting cultivation , as a part of field preparation for planting. Often called field burning, this technique is used to clear the land of any existing crop residue as well as kill weeds and weed seeds. Field burning is less expensive than most other methods such as herbicides or tillage, but because it produces smoke and other fire-related pollutants, its use is not popular in agricultural areas bounded by residential housing. Prescribed fires are broadly used in

3920-456: Is used by farmers for plant health reasons under several restrictions in cross-compliance regulations. In the north of Great Britain , large areas of grouse moors are managed by burning in a practice known as muirburn. This kills trees and grasses, preventing natural succession, and generates the mosaic of ling (heather) of different ages which allows very large populations of red grouse to be reared for shooting. The peat-lands are some of

4032-416: 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,

4144-692: 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

4256-965: 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

4368-569: 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

4480-480: 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

4592-504: 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,

Reading Fire - Misplaced Pages Continue

4704-485: The Yellowstone fires of 1988 occurred, which significantly politicized fire management. The ensuing media coverage was a spectacle that was vulnerable to misinformation. Reports drastically inflated the scale of the fires which disposed politicians in Wyoming, Idaho, and Montana to believe that all fires represented a loss of revenue from tourism. Paramount to the new action plans is the suppression of fires that threaten

4816-410: 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

4928-548: The soil , damaging it physically , chemically or sterilizing it. Broadcast burns tend to have lower temperatures and will not harm the soil as much as pile burning, though steps can be taken to treat the soil after a burn. In lop and scatter burning, slash is left to compact over time, or is compacted with machinery. This produces a lower intensity fire, as long as the slash is not packed too tightly. The risk of fatal fires that stem from burning slash can also be reduced by proactively reducing ground fuels before they can create

5040-493: The 20th century, fire control authorities began reintroducing controlled burns and indigenous leadership into land management. Controlled burning reduces fuels , improves wildlife habitat , controls competing vegetation, helps control tree disease and pests , perpetuates fire dependent species and improves accessibility . To improve the application of prescribed burns for conservation goals, which may involve mimicking historical or natural fire regimes, scientists assess

5152-463: 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

5264-765: The Hat Creek Ranger District of the Lassen National Forest, and 75 acres (30 ha) of private land. Of the 7,041 fires during California's 2012 wildfire season , which burned a total of 829,224 acres (335,575 ha), the Reading Fire was the seventh largest. There were no fatalities or serious injuries associated with the Reading Fire. According to the National Park Service review of the fire, only two minor firefighter injuries occurred. The Reading Fire caused

5376-530: The Lassen Volcanic National Park superintendent to manage the fire. The initial goal was to confine the fire to an area of just 700 acres (280 hectares), bounded by two drainages and by Lassen National Park Highway to the north. The Reading Fire was initially managed by a Type 4 incident management team and approximately 16 firefighters. By July 30, one week after ignition, the fire had grown to three acres (1.2 hectares). During that week

5488-730: The Park Service for their decision to manage the fire. The director of fire and aviation management for the Pacific Southwest Region of the Forest Service and the deputy director of Cal Fire both said they would have extinguished the fire immediately had it ignited in their areas of responsibility. Shasta County residents also spoke at the hearing, largely to air their view that the Reading Fire had negatively impacted tourism income. The following summer, Lassen Volcanic National Park officials announced they would not manage natural lightning fires or set any prescribed fires in

5600-677: The Shasta County board of supervisors , U.S. Congressional representatives Wally Herger ( CA-02 ) and Tom McClintock ( CA-04 ) called an informal hearing at the California State Capitol in Sacramento on October 24, 2012, inviting testimony from the Park Service, the Forest Service, and the California Department of Forestry and Fire Protection (Cal Fire). Both representatives heavily criticized

5712-671: The Twin Lakes Loop Trail, the Nobles Emigrant Trail , and parts of the Pacific Crest Trail . Of the roughly 11,000 acres (4,500 ha) that the fire burned in the Lassen National Forest, 65 percent experienced a moderate-to-high soil burn severity. The other 35 percent experienced low to very low soil burn severity. For the roughly 17,000 acres (6,900 ha) that the Reading Fire burned in Lassen Volcanic National Park, 49 percent experienced

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5824-505: 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

5936-779: 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,

6048-409: The age of a stand or the assemblage of species. To minimize the impact of smoke , burning should be restricted to daylight hours whenever possible. Furthermore, in temperate climates, it is important to burn grasslands and prairies before native species begin growing for the season so that only non-native species, which send up shoots earlier in the spring, are affected by the fire. Back burning or

6160-435: 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

6272-732: 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

6384-470: 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

6496-444: 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

6608-654: The closure of the Lassen Park Highway for 20 days, as well as the closure of about 30 miles (48 km) of trails in and near the park. The Pacific Crest Trail closed to hikers between Lower Twin Lake to the south and Old Station to the north (outside the Lassen National Forest). The park itself did not close to visitors. No structures were lost in the Reading Fire. The fire burned through multiple trails in Lassen Volcanic National Park, including

6720-426: The composition of plants from non-native species to native species. These controlled burns occur during the early spring before native plants begin actively growing, when soil moisture is higher and when the fuel load on the ground is low to ensure that the controlled burn remains low intensity. Controlled burns reduce the amount of understory fuel so when a wildfire enters the area, a controlled burn site can reduce

6832-541: The cone or woody husk to open and disperse seeds. Fire is a natural part of both forest and grassland ecology and has been used by indigenous people across the world for millennia to promote biodiversity and cultivate wild crops. Colonial law in North America and Australia displaced indigenous people from lands that were controlled with fire and prohibited from conducting traditional controlled burns. After wildfires began increasing in scale and intensity in

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6944-480: The containment lines on Prospect Peak . By August 18, aided by good weather and water-dropping helicopters, the containment lines on the fire's north and west sides were completed and the fire's overall containment rose to 32 percent. The remaining areas of active fire on the east and southeast sides of the fire were addressed by firefighters constructing containment lines by hand in designated wilderness areas , helped by less dense fuels—the effects of other wildfires in

7056-592: The context of woody plant encroachment , with the aim of improving the balance of woody plants and grasses in shrublands and grasslands. In Northern-India, especially in Punjab , Haryana , and Uttar Pradesh , unregulated burning of agricultural waste is a major problem. Smoke from these fires leads to degradation in environmental quality in these states and the surrounded area. In East Africa, bird densities increased months after controlled burning had occurred. Controlled burns on Australian savannas can result in

7168-473: The cooler months to reduce fuel buildup and decrease the likelihood of more dangerous, hotter fires. Controlled burning stimulates the germination of some trees and reveals soil mineral layers which increases seedling vitality. In grasslands , controlled burns shift the species assemblage to primarily native grassland species. Some seeds , such as those of lodgepole pine , sequoia and many chaparral shrubs are pyriscent , meaning heat from fire causes

7280-497: The created of a prescribed burn program as well as training and regulation for controlled burns in Ontario. In British Columbia , there was an increase in the intensity and scale of wildfires after local bylaws restricted the use of controlled burns. In 2017, following one of the worst years for wildfire in the province's history, indigenous leadership and public service members wrote an independent report that suggested returning to

7392-633: 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. Controlled burn Controlled burns are conducted during

7504-529: The dry season results in a mosaic of burnt and unburnt country which reduces the area of stronger, late dry season fires; it is also known as "patch burning". Health and safety, protecting personnel, preventing the fire from escaping and reducing the impact of smoke are the most important considerations when planning a controlled burn. While the most common driver of fuel treatment is the prevention of loss of human life and structures, certain parameters can also be changed to promote biodiversity and to rearrange

7616-697: 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

7728-411: 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

7840-459: The fire behaved as predicted, slowly spreading downhill while only consuming surface fuels/vegetation. As the calendar turned to August, the fire began to expand at a greater pace. By the 3rd of the month, it had burned 50 acres (20 ha), and by the following day, 94 acres (38 ha). On August 6, as management of the fire was being handed over to a Type 3 incident management team, the Reading Fire spotted (jumped, via windblown embers) across

7952-402: 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

8064-437: The fire has cleared non fire-adapted, competing species. Pyriscent species benefit from moderate-intensity fires in older stands; however, climate change is causing more frequent high intensity fires in North America. Controlled burns can manage the fire cycle and the intensity of regenerate fires in forests with pyriscent species like the boreal forest in Canada. Eucalyptus regnans or mountain ash of Australia also shows

8176-417: 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

8288-452: 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

8400-421: 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

8512-441: 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

8624-593: The goal of suppressing all fires. Since 1995, the US Forest Service has slowly incorporated burning practices into its forest management policies. Fire suppression has changed the composition and ecology of North American habitats, including highly fire-dependent ecosystems such as oak savannas and canebrakes, which are now critically endangered habitats on the brink of extinction. In the Eastern United States, fire-sensitive trees such as

8736-454: 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

8848-412: The impact of variation in fire attributes. Parameters measured are fire frequency, intensity, severity, patchiness, spatial scale and phenology. Furthermore, controlled fire can be used for site preparation when mechanized treatments are not possible because of terrain that prevents equipment access. Species variation and competition can drastically increase a few years after fuel treatments because of

8960-412: The increase in soil nutrients and availability of space and sunlight. Many trees depend on fire as a way to clear out other plant species and release their seeds. The giant sequoia , among other fire-adapted conifer species, depends on fire to reproduce. The cones are pyriscent so they will only open after exposed to a certain temperature. This reduces competition for the giant sequoia seedlings because

9072-475: The increasing prevalence of climate change. As drought conditions worsen, North America has been facing an abundance of destructive wildfires. Since 1988, many states have made progress toward controlled burns. In 2021, California increased the number of trained personnel to perform controlled burns and created more accessibility for landowners. In the European Union, burning crop stubble after harvest

9184-443: The indigenous practice of prescribed fire. This was done against scientific evidence that supported prescribed burns as a natural process. At the loss to the local environment, colonies utilized fire suppression in order to benefit the logging industry. The notion of fire as a tool had somewhat evolved by the late 1970s as the National Park Service authorized and administered controlled burns. Following prescribed fire reintroduction,

9296-495: 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

9408-432: The intensity of the fire or prevent the fire from crossing the area entirely. A controlled burn prior to the wildfire season can protect infrastructure and communities or mitigate risks associated with many dead standing trees such as after a pest infestation when forest fuels are high. In the developing world, the use of controlled burns in agriculture is often referred to as slash and burn . In industrialized nations, it

9520-477: 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

9632-415: The land and a new, like-aged eucalyptus forest grows. Other tree species like poplar can easily regenerate after a fire into a like-aged stand from a vast root system that is protected from fires because it is underground. Native grassland species in North America and Australia are adapted to survive occasional low intensity fires. Controlled burns in prairie ecosystems mimic low intensity fires that shift

9744-518: The largest carbon sinks in the UK, providing an immensely important ecological service. The governments has restricted burning to the area but hunters have been continuing to set the moors ablaze, releasing a large amount of carbon into the atmosphere and destroying native habitat. The Maasai ethnic group conduct traditional burning in savanna ecosystems before the rainy season to provide varied grazing land for livestock and to prevent larger fires when

9856-448: The loss of human life with leniency toward areas of historic, scientific, or special ecological interest. There is still a debate amongst policy makers about how to deal with wildfires. Senators Ron Wyden and Mike Crapo of Oregon and Idaho have been moving to reduce the shifting of capital from fire prevention to fire suppression following the harsh fires of 2017 in both states. Tensions around fire prevention continue to rise due to

9968-425: The mop up has finished, the Burn Boss declares the controlled burn over and local fire authorities are notified. There are several different methods used to burn piles of slash from forestry operations. Broadcast burning is the burning of scattered slash over a wide area. Pile burning is gathering up the slash into piles before burning. These burning piles may be referred to as bonfires . High temperatures can harm

10080-704: The park for the season, citing drought conditions and "lessons learned from the previous year’s Reading Fire". 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

10192-640: The park have a "strong tendency" to burn from southwest to northeast. A scant winter snowpack leading up to the 2012 fire season in Northern California drove the moisture levels in all dead fuels (including large fuels that take longer to dry out, such as dead fallen trees and brush piles) to record low levels. The low fuel moistures contributed to ' spotting ' fire behavior on the Reading Fire, where wind-blown firebrands or embers start new fires where they land. On July 23, 2012, thunderstorms developed over Lassen Volcanic National Park. Lightning struck

10304-457: The park highway where personnel had intended to hold the fire. The fire took root in the Hat Creek drainage and continued to expand, reaching 1,010 acres (410 ha) by the end of the day. On August 7, continued winds out of the south pushed the fire north and out of the park itself, and the Reading Fire became established on Badger Mountain in the Lassen National Forest. Air tankers attacked

10416-412: The park, before it was fully contained on August 22, 2012. The fire destroyed no buildings and caused no fatalities or even serious injuries. The fire's unintended escape led members of the public and several California politicians to criticize park officials for allowing the fire to go unsuppressed after its discovery. Burn scars in tree rings suggest that wildfires historically burned in the area that

10528-484: 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

10640-481: The prescribed burn is divided into several roles; the Burn Boss, Communications, Suppression and Ignition. The planning process begins by submitting an application to a local fire management office and after approval, applicants must submit a burn plan several weeks prior to ignition. On the day of the controlled burn, personnel meet with the Burn Boss and discuss the tactics being used for ignition and suppression, health and safety precautions, fuel moisture levels and

10752-581: The red maple are increasing in number, at the expense of fire-tolerant species like oaks. In the Anishinaabeg Nation around the Great Lakes , fire is a living being that has the power to change landscapes through both destruction and the regrowth and return of life following a fire. Human beings are also inexorably tied to the land they live on as stewards who maintain the ecosystems around them. Because fire can reveal dormant seedlings, it

10864-420: The resulting spot fires. Fire growth continued to accelerate: on the 8th the fire had burned 2,000 acres (810 ha), by the 10th more than 9,000 acres (3,600 ha), and by August 12, the fire had burned more than 15,000 acres (6,100 ha). On August 13, a Type 1 incident management team took control of the suppression effort and began to perform firing operations to contain the fire indirectly. Meanwhile,

10976-404: 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

11088-493: The speed of a back burn is to use a flank fire which is lit at right angles to the prevailing wind and spreads in the same direction. In Ontario, Canada, controlled burns are regulated by the Ministry of Natural Resources and only trained personnel can plan and ignite controlled burns within Ontario's fire regions or if the Ministry of Natural Resources in involved in any aspect of planning a controlled burn. The team performing

11200-399: 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

11312-461: The traditional use of prescribed burns to manage understory fuel from wildfires. The government of British Columbia responded by committing to using controlled burns as a wildfire management tool. The Oregon Department of Environmental Quality began requiring a permit for farmers to burn their fields in 1981, but the requirements became stricter in 1988 following a multi-car collision in which smoke from field burning near Albany, Oregon , obscured

11424-477: The two decades prior. The fire was declared fully contained on August 22. The firefighting effort involved more than 1,200 personnel at its peak, at a total cost of $ 17 million (equivalent to about $ 22 million in 2023). The fire was declared controlled on October 23, 2012. The total burned area was 28,079 acres (11,363 ha). This footprint comprised 16,993 acres (6,877 ha) burned in Lassen Volcanic National Park, 11,071 acres (4,480 ha) burned in

11536-936: 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

11648-492: The vision of drivers on Interstate 5 , leading to a 23-car collision in which 7 people died and 37 were injured. This resulted in more scrutiny of field burning and proposals to ban field burning in the state altogether. With controlled burns, there is also a risk that the fires get out of control. For example, the Calf Canyon/Hermits Peak Fire , the largest wildfire in the history of New Mexico ,

11760-420: The weather (wind direction, wind speed, temperature and precipitation) for the day. On site, local fire control authorities are notified by telephone about the controlled burn while the rest of the team members fill drip torches with pre-mixed fuel, fill suppression packs with water and put up barricades and signage to prevent pedestrian access to the controlled burn. Driptorches are canisters filled with fuel and

11872-411: 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,

11984-436: The wind speed and wind direction so the Burn Boss can determine how the direction of both flames and smoke and plan their lines of fire accordingly. Once the ignition phase has ended in a section, the suppression team "mops up" by using suppression packs to suppress smoldering material. Other tools used for suppression are RTVs equipped with a water tank and a pump and hose that is installed in a nearby body of water. Finally, once

12096-519: 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

12208-466: 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

12320-794: 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

12432-480: Was spearheaded by Edmund Zavitz in Ontario, caused a ban on all fires, both natural wild fires and intentional fires. In the 1970s, Parks Canada began implementing small prescribed burns however, the scale of wildfires each year outpaces the acreage of land that is intentionally burnt. In the late 1980s, the Ministry of Natural Resources in Ontario began conducting prescribed burns on forested land which led to

12544-493: Was started by two distinct instances of controlled burns, which had both been set by the US Forest Service , getting out of control and merging. The conflict of controlled burn policy in the United States has roots in historical campaigns to combat wildfires and to the eventual acceptance of fire as a necessary ecological phenomenon. Following colonization of North America, the US used fire suppression laws to eradicate

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