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Wildfire

Wildfire
A wildfire is any uncontrolled, non-structure fire that occurs in the wilderness, wildland, or bush.[1][2] Other names such as wildland fire, forest fire, brush fire, vegetation fire, grass fire, peat fire, bushfire (in Australasia), and hill fire are commonly used. The name wildfire was once a synonym for Greek fire as well as a word for any furious or destructive conflagration.[3] Wildfires are common in various parts of the world, occurring in cycles. They are often considered beneficial to the wilderness, as many plant species are dependent on the effects of fire for growth and reproduction. However, large wildfires often have detrimental atmospheric consequences.[4] Nine out of ten wildfires are reportedly caused by some human interaction;[5] others are caused by natural events such as lightning strikes, volcanic discharges, etc. Wildfires differ from other fires only by their extensive size; the speed at which it spreads out from its original source; its ability to change direction unexpectedly; and to jump gaps, such as roads, rivers and fire breaks. Wildfires generally do not involve properties; however, with extensive urbanization of wilderness, they can cause extensive destruction of homes and other property located in the wildland-urban interface, a zone of transition between developed areas and undeveloped wilderness.[6] The strategies of prevention, detection, and suppression strategies have varied over the years, but now incorporate techniques that permit and even encourage fires in some regions as a means of minimising or removing sources of ’fuel’ from any wildfire that might develop.

Satellite image of wildfires on the African continent in 2002, part of a presentation on NASA’s World Wind program higher;[7] the velocity of the burning front, which can as fast as 11 kilometres per hour (6.8 mph) in forests and 22 kilometres per hour (14 mph) in grasslands;[8] and the ability of the burning front to unexpectedly change direction and to jump across fire breaks. The intense heat and smoke can lead to disorientation and loss of appreciation of the direction of the fire. These factors make fires particularly dangerous: for example, in 1949 the Mann Gulch fire thirteen Smokejumpers died when they lost their communication links and became disorientated; the fire consumed 18 km² (4500 acres).[9] 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.[10] Even before the flames of a wildfire arrive at a particular location, heat from the wildfire ’front’ can precede the flames drying and pre-heating flammable materials, due to temperatures nearing 800 °C (1,470 °F).[11][12] High-temperature and long-duration surface wildfires may encourage flashover or torching: the drying of tree canopy, the fuel, and their subsequent ignition from below.[13]

Distinction from other fires
Fires start when an ignition source is brought into contact with a combustible material (e.g. peat, shrub, trees) that is subjected to sufficient heat and has an adequate supply of oxygen from the ambient air (see Fire triangle). The event that triggers ignition may be natural, such as a lightening strike, or an action of man. Wildfires differ from other fires in that they take place outdoors in areas of grassland, woodlands, bush, scrubland, peat, and other woody materials that act as a source of fuel (or combustible material). Buildings are not usually involved, unless the fire spreads to adjacent communities and threatens these structures. Some of the defining characteristics of wildfires are the large area of burned land, upwards of 100,000 acres (404.7 km²) to 1,000,000 acres (4,046.9 km²), and

Characteristics
Wildfire behavior is often complex and variably dependent on factors such as fuel type, moisture content in the fuel, humidity, windspeed, topology,[14] geographic location, and ambient temperature.[15] While growth and behavior are unique to each fire due to many complex variables, the basic characteristics can be described as follows:[16][17]

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Wildfire

Physical properties
See also: Fire#Chemistry, Fire control, and Flash point

A surface fire in the western Utah desert. Experimental fire in Canada A wildfire front is the portion sustaining continuous flaming combustion, where unburned material meets active flames, or the smouldering transition between unburned and burned material.[18] As the front approaches, 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), then pyrolyzed around 230 °C (450 °F) to release flammable gases, then the wood will either will smolder around 380 °C (720 °F)[19] or ignite around 590 °C (1,100 °F).[20] A high moisture content usually prevents ignition and slows propagation,[14] because higher temperatures are required to evaporate the contained water and heat the material to its flash point.[21] Dense forests usually provide more shade, resulting in lower ambient temperatures and greater humidity.[22] 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.[23] Plants continuously lose water by evaporation, but water loss is usually balanced by water absorbed from the soil, humidity, or rain.[24] When this balance is not maintained, plants dry out and are therefore more flammable, often a consequence of a long, hot, dry periods.[25][26]

Charred landscape following a crown fire in the North Cascades. susceptible to ignition due to spotting (see Extremes). Ground fires typically burn by smoldering,[28] and can burn slowly for days to months,[29] such as peat fires in Kalimantan and East Sumatra, Indonesia, a result of a riceland creation project that unintentionally drained and dried the peat.[30] • Crawling or surface: low-lying vegetation such as leaf and timber litter, debris, grass (see grassland), and low-lying shrubbery. • Ladder: material between low-level vegetation and tree canopies, such as small trees, downed logs, vines, and invasive plants.[31] • Crown, canopy, or aerial: suspended material at the canopy level, such as tall trees, vines, and mosses. The ignition of a crown fire is dependent on the density of the suspended material, canopy height, canopy continuity, and sufficient surface and ladder fires in order to reach the tree crowns.[14][25][32][33][34][35]

Fuel Type
Wildfires and their spread vary greatly based on the flammable material present and its vertical arrangement.[27] Fuel density is governed by topography, as land shape determines factors such as available sunlight and water for plant growth. For example, fuels uphill from a fire are more readily dried and warmed by the fire than those downhill, yet burning logs can roll downhill. Overall, fire types can be generally characterized by their fuel as follows: • Ground: subterranean roots, duff and other buried organic matter. This fuel type is especially

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From Wikipedia, the free encyclopedia

Wildfire
Air rises as it is heated, and large wildfires create powerful updrafts that will draw in new air from surrounding areas (see Thermal column, Stack effect).[52] Great vertical differences in temperature and humidity encourage pyrocumulus clouds and intense winds,[53] which are often 10 times faster than ambient wind (more than 50 miles per hour (80 km/h)[54] ). Extreme fire behavior includes wide rates of spread, prolific crowning and/or spotting, the presence of fire whirls, and a strong convection column.[55]

Effect of Weather
Weather patterns such as heat waves, droughts, and cyclical climate changes such as El Niño can also dramatically increase the risk and alter the behavior of wildfires.[36] Years of precipitation followed by warm periods have encouraged more widespread fires and longer fire seasons.[37] Fire 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.[38] Sunlight warms the ground during the day and causes air currents to travel uphill, and downhill during the night as the land cools. Wildfires are fanned by these winds and often follow the air currents over hills and through valleys.[39] Fires in Europe occur frequently during the hours of 12:00pm and 2:00pm.[40] US wildfire operations revolve around a 24-hour fire day that begins at 1000 hours due to the predictable increase in intensity resulting from the daytime warmth.[41]

Fossil record
The fossil record of fire first appears with the establishment of a land-based flora in the Middle Ordovician period, 470 million years ago,[56] permitting the accumulation of oxygen in the atmosphere as never before, as the new hordes of land plants pumped it out as a waste product. When this concentration rose above 13%, it permitted the possibility of wildfire. Wildfire is first recorded in the Late Silurian fossil record, 420 million years ago, by fossils of charcoalified plants.[57] Apart from a controversial gap in the Late Devonian, charcoal is present ever since.[57] The level of atmospheric oxygen is closely related to the prevalence of charcoal: clearly oxygen is the key factor in the abundance of wildfire.[58] Fire also became more abundant when grasses radiated and became the dominant component of many ecosystems, around 6 to 7 million years ago;[59] this kindling provided tinder which allowed for the more rapid spread of fire.[58] These widespread fires may have initiated a positive feedback process, whereby they produced a warmer, drier climate more conducive to fire.[58]

Causes
The four major natural causes of wildfire are lightning, volcanic eruption, sparks from rockfalls, and spontaneous combustion.[42] Underground coal fires can also ignite wildfires,[43] and human activity plays a major role. Many are started by arson, and fire is often considered the least expensive way to clear and prepare land for future use (see Slash-and-burn farming).[44][45] Forested areas cleared by logging encourages the dominance of flammable grasses, and abandoned logging roads overgrown by vegetation may act as fire corridors. Additionally, annual grassland fires in South Vietnam can be attributed in part to the destruction of forested areas by herbicides, explosives, and mechanical land clearing and burning operations during the Vietnam War.[46]

Ecology
See also: Disturbance (ecology) Wildfires are common in climates that are sufficiently moist to allow the growth of trees but feature extended dry, hot periods. Such places include the vegetated areas of Australia and south east Asia, the veld in the interior and the fynbos in the Western Cape of South Africa, and the forested areas of the United States and Canada. Fires can be particularly intense during days of strong winds and periods of drought.[60] Fire prevalence is also high during the summer and autumn months, when fallen branches, leaves, grasses, and scrub dry out and become more flammable.[61][62] Global warming may increase the intensity and frequency of droughts in many areas, creating more intense and frequent wildfires.[4][63][64] Wildfires are considered a natural part of the ecosystem of numerous wildlands,[61] where some plants have evolved to survive fires by a variety of strategies, such as fire-resistant seeds and reserve shoots that sprout after a fire (see Pioneer species). Smoke, charred wood, and

Extremes
See also: Extreme weather and Firestorm Fires in forested areas can move at speeds of 10.8 kilometres per hour (7 mph), while grass fires have been recorded at up to 22 kilometres per hour (14 mph).[8] Wildfires can advance tangential to the main front to form a flanking front or burn opposite the direction of the main front by backing.[47] Wildfires may also spread by jumping or spotting, as winds and vertical convection columns carry hot wood embers (firebrands) and other burning materials through the air over roads, rivers, and other natural barriers or firebreaks.[48][49] Torching and crown fires are prone to spotting, and dry ground fuels that surround a wildfire are especially vulnerable to ignition from firebrands.[50] In Australian bushfires, spot fires have been documented "up to 10 kilometres (6 mi) ahead of the fire front."[51]

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Wildfire

Fireweed, an example of a pioneer species that quickly colonizes an area after a wildfire. heat are common fire cues that stimulate the germination of seeds.[65] Exposure to smoke from burning plants promotes germination in other types of plants by inducing the production of the orange butenolide.[66] Grasslands in Western Sabah, Malaysian pine forests, and Indonesian Casuarina forests are believed to have resulted from previous periods of fire.[67] Plants of the genus Eucalyptus contain flammable oils that can encourage fire,[68] and hard sclerophyll leaves to resist heat and drought, ensuring their dominance over less fire-tolerant species.[69] However, many ecosystems are suffering from too much fire, such as the chaparral in southern California and lower elevation deserts in the American Southwest. The increased fire frequency in these areas has caused the elimination of native plant communities and have replaced them with non-native weeds.[70][71] Invading species such as Lygodium microphyllum and Bromus tectorum may create a positive feedback loop, increasing fire frequency even more.[31][72] Wildfires generate ash, destroy available organic nutrients, and cause an increase in water runoff, eroding away other nutrients and creating flash flood conditions.[73][74] Also, wildfires can have an effect on climate change, increasing the amount of carbon released into the atmosphere and inhibiting vegetation growth, which affects overall carbon uptake by plants.[75]

A Pyrocumulus cloud produced by a wildfire in Yellowstone National Park in the stratosphere came from volcanoes, but smoke and other wildfire emissions have been detected from the lower stratosphere.[77] Pyrocumulus clouds can reach 20,000 feet (6,100 m) over wildfires.[78] With an increase in fire byproducts in the stratosphere, ozone concentration was three times more likely to exceed health standards.[79] Satellite observation of smoke plumes from wildfires revealed that the plumes could be traced intact for distances exceeding 1,000 miles (1,600 km).[80] Computer-aided models (e.g. CALPUFF) may help predict the size and direction of wildfire-generated smoke plumes (see Atmospheric dispersion modeling).[81] Wildfires can affect climate and weather and have major impacts on regional and global pollution.[82] Wildfire emissions contain greenhouse gases and a number of criteria pollutants which can have a substantial impact on human health and welfare.[83] Forest fires in Indonesia in 1997 were estimated to have released between 0.81 and 2.57 gigatonnes of CO2 into the atmosphere, which is between 13-40% of the annual carbon dioxide emissions from burning fossil fuels.[84][85] Atmospheric models suggest that these concentrations of sooty particles could increase absorption of incoming solar radiation during winter months by as much as 15%.[86]

Atmospheric effects
See also: Air pollution, Atmospheric chemistry, Haze, 1997 Southeast Asian haze, 2005 Malaysian haze, and 2006 Southeast Asian haze Most of the Earth’s weather and air pollution reside in the troposphere, the part of the atmosphere that extends from the surface of the planet to a height of between 8 and 13 kilometers. A severe thunderstorm or pyrocumulonimbus in the area of a large wildfire can have its vertical lift enhanced to boost smoke, soot and other particulate matter as high as the lower stratosphere.[76] Previously, it was thought that most particles Smoke trail from a fire seen while looking towards Dargo from Swifts Creek, 11 January 2007

Prevention
See also: Fire protection and Native American use of fire Wildfire prevention "involves all measures that impede the outbreak of fire or reduce its severity and spread."[87] Effective prevention techniques allow supervising agencies to manage air quality, maintain ecological balances, protect resources,[88] as well as limiting the

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effects of future uncontrolled fires.[89] Many wilderness areas are now considered fire-dependent, and previous policies of complete suppression are believed to have upset natural cycles[90] and increased fuel loads and the amount of fire intolerant vegetation.[91] Current policies often permit fires to burn to maintain their ecological role, so long as the risks of escape onto high-value areas are mitigated.[92] However, prevention policies must consider the role that humans play in wildfires, since, for example, only 5% of forest fires in Europe are not related to human involvement.[93] Sources of humancaused fire may include arson, accidental ignition, or the uncontrolled use of fire in land-clearing and agriculture (for example, slash-and-burn farming in Southeast Asia).[94]

Wildfire
While wildfires are a combination of factors such as topology, fuels, and weather, only fuels may be altered to affect future fire risk and behavior.[98] Current wildfire prevention programs may employ techniques such as wildland fire use and prescribed burns (controlled burns).[2][99] 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.[100] Vegetation may be burned periodically to maintain high species diversity,[101] and frequent burning of surface fuels limits fuel accumulation, thereby reducing the risk of crown fires.[102] Using strategic cuts of trees, fuels may also be removed by handcrews in order to clean and clear the forest, prevent fuel build-up, and create access into forested areas.[103] Chain saws and large equipment can be used to thin out ladders fuels and shred trees and vegetation to a mulch.[104] Multiple fuel treatments are often needed to influence future fire risks,[105] and wildfire models may be used to predict and compare the benefits of different fuel treatments on future wildfire spread. However, controlled burns are reportedly "the most effective treatment for reducing a fire’s rate of spread, fireline intensity, flame length, and heat per unit of area."[106] Additionally, while fuel treatments are typically limited to smaller areas, effective fuel management requires the administration of fuels across large landscapes in order to reduce future fire size and severity.[107] Building codes in fire-prone areas typically require that structures be built of flame-resistant materials[108] and a defensible space be maintained by clearing flammable materials within a prescribed distance from the edifice.[109] Communities in the Philippines also maintain fire lines 5-10 metres (16-32 feet) wide between the forest and their village, and patrol these lines during summer months or seasons of dry weather.[110]

1985 Smokey Bear poster. In the mid-1800s, explorers from the HMS Beagle observed Australian Aborigines using fire for ground clearing, hunting, and regeneration of plant food (see Firestick farming).[95] Such careful use of fire has been employed for centuries in the Kakadu National Park to encourage biodiversity.[96] In 1937, US President Franklin D. Roosevelt initiated a nationwide fire prevention campaign, highlighting the role of human carelessness in forest fires. Later posters of the program featured Uncle Sam, leaders of the Axis powers of World War II, characters from the Disney movie Bambi, and lastly Smokey Bear.[97]

"Forest development on the Bitterroot National Forest in Montana in a ponderosa pine stand after harvest (1909) in which fire was excluded since 1895. Note the changes in vertical arrangement and horizontal continuity in forest stand structure."[111]

Detection
Fast and effective detection is a key factor in wildfire fighting.[112] Early detection efforts were focused on early response, accurate day and nighttime use, the ability to prioritize fire danger, and fire size and location in relation to topography. Fire lookout towers were used in the early 1900s, and fires were reported using

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METHOD Aero/satellite Infrared/smoke scanners Unaided lookout Local sensor network SIZE AREA Very large (>250,000 acres) Medium (10,000-250,000 acres) Medium (10,000-250,000 acres) Small (<10,000 acres) RISK LEVEL Low DETECTION WITHIN 12 ha (30 acres)

Wildfire

Medium 0.01 ha (1,100 ft²) at 20 km (12 mi)[117] Medium 22 m² (240 ft²) at 13 km (8 mi) and 44 m² (480 ft²) at 25 km (16 mi)[118] High 150 sq ft (15 m²)

observation may be limited by operator fatigue (see Asthenopia), time of day, time of year, and geographic location. Electronic systems have gained popularity in recent years as 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 GPS into a collective whole for near-realtime use by wireless Incident Command Centers.[115][116]

Dry Mountain Fire Lookout in the Ochoco National Forest, circa 1930. telephones, carrier pigeons, and heliographs.[113] 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 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 fire information delivery in approximately four hours.[114] Currently, 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

Wildfires across the Balkans in late July 2007 (NASA satellite image) A small, high risk area (thick vegetation, strong human presence or close to 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.[119][120][121] These may be batterypowered, solar-powered, or tree-rechargeable: able to recharge their battery systems using the small electrical

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currents in plant material.[122] Larger, medium-risk areas could be monitored by scanning towers that incorporate fixed cameras and sensors to detect smoke or additional factors such as the "infrared signature of carbon dioxide produced by fires." Brightness and color change detection as well as night vision capabilities may be incorporated also into sensor arrays.[123][124][125]

Wildfire

Fire Propagation Model Principle to simulate fire growth as a continuously expanding polygon.[134][135] However, large fires that exceed suppression capabilities are often regarded as statistical outliers in these analyses (see Extreme value theory), even though catastrophic wildfires greatly influence fire policies.[136]

The Old Fire burning in the San Bernardino Mountains (image taken from the International Space Station) Satellite and aerial monitoring 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.[126][127] Satellite-mounted sensors such as Envisat’s AATSR and ERS-2’s ATSR can measure infrared radiation emitted by fires, identifying hot spots greater than 39 °C (102 °F).[128][129] The NOAA’s Hazard Mapping System combines remote-sensing data from satellite sources such as GOES, MODIS, and AVHRR for detection of fire and smoke plume locations (see 2006 Southeast Asian haze#Imagery).[130][131] However, satellite detection is prone to offset errors, anywhere from 2–3 km (1-2 mi) for MODIS and AVHRR data and up to 12 km (7.5 mi) for GOES data.[132] 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 and may also limit the effectiveness of satellite imagery.[133]

Suppression
See also: Firefighting

Tanker 910 during a drop demonstration in December, 2006 Wildfire suppression may include a variety of tools and technologies, from throwing sand and beating fires with sticks and palm fronds in rural Thailand,[137] to fullscale aerial assaults by planes and helicopters using drops of water and fire retardants.[138] Complete fire suppression 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 can cause extensive damage. Wildfires in the United States are responsible for "about 95% of the total acres burned and close to 85% of all suppression costs,"[139][140] as suppression efforts and damage caused can exceed billions of US dollars annually. [141][142][143] Yearly fires in Canada consume an average of 6,200,000 acres (25,000 km2)[144] and in the US an average of 7,320,000 acres (29,600 km2).[145]

Modeling
See also: Weather forecasting Wildfire modeling involves the statistical analysis of past fire events to predict spotting risks and front behavior. Various wildfire propagation models have been proposed in the past, including simple ellipses and egg- and fan-shaped models. Early attempts to determine wildfire behavior assumed terrain and vegetation uniformity. However, the exact behavior of a wildfire’s front is dependent on a variety of factors, including windspeed and slope steepness. Modern growth models utilize a combination of past ellipsoidal descriptions and Huygens’

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Fuel buildup can result in costly, devastating fires as more new houses and ranches are built adjacent to wilderness areas. Continued growth in fire-prone areas and rebuilding structures destroyed by fires has been met with criticism.[146] However, the population growth along the wildland-urban interface discourages the use of current fuel management techniques. Smoke is an irritant and attempts to thin out the fuel load is met with opposition due to desirability of forested areas, in addition to other wilderness goals such as endangered species protection and habitat preservation.[147] The ecological benefits of fire is often overridden by the economic benefits of protecting structures and lives.[143] Additionally, government policies that cover the wilderness usually differs from local and state policies that govern urban lands.[148][149]

Wildfire
http://www.dse.vic.gov.au/CA256F310024B628/0/ 97892B7CD0C75AB3CA2572230047B454/$File/ Research+Report+20.pdf General Technical Report INT-GTR-299 - Mann Gulch Fire: A Race That Couldn’t Be Won, United States Department of Agriculture, Forest Service, Intermountain Research Station, May 1993, http://www.fs.fed.us/rm/pubs_int/int_gtr299/ "Victoria emergency services warn people to prepare for horror fire conditions". News.com. 2009-02-26. http://www.news.com.au/story/ 0,27574,25109443-421,00.html. Retrieved on 2009-02-26. NWCG Communicator’s Guide, 3. Satellites are tracing Europe’s forest fire scars, European Space Agency, 2004-07-27, http://www.esa.int/esaCP/ SEMNJMV4QWD_Protecting_0.html, retrieved on 2009-01-12 Graham, et al., 10-11. ^ (PDF) NWCG Fireline Handbook, Appendix B: Fire Behavior, National Wildfire Coordinating Group, April, 2006, http://www.nwcg.gov/pms/pubs/410-2/ appendixB.pdf, retrieved on 2008-12-11 Graham, et al., 12. NWCG Communicator’s Guide, 4-6. Graham, et al., 12. Glossary of Wildland Fire Terminology, 74. de Sousa Costa and Sandberg, 229-230. Archimedes Death Ray: Idea Feasibility Testing, MIT, October 2005, http://web.mit.edu/2.009/www/ experiments/deathray/10_ArchimedesResult.html, retrieved on 2009-02-01 The Science of Wildland fire, NIFC, http://www.nifc.gov/ preved/comm_guide/wildfire/fire_4.html, retrieved on 2008-11-21 Graham, et al., 12. NWCG Communicator’s Guide, 3. Associated Press (2008-11-15), Ashes cover areas hit by Southern Calif. fires, MSNBC, http://www.msnbc.msn.com/id/27148069/, retrieved on 2008-12-04 ^ (PDF) Influence of Forest Structure on Wildfire Behavior and the Severity of Its Effects, USDA Forest Service, November 2003, http://www.fs.fed.us/projects/ hfi/2003/november/documents/forest-structurewildfire.pdf, retrieved on 2008-11-19 Prepare for a Wildfire, FEMA, http://www.fema.gov/ hazard/wildfire/wf_prepare.shtm, retrieved on 2008-12-01 Graham, et al., iv. Graham, et al., 9. Graham, et al., 13 Rincon, Paul (3-9-2005), Asian peat fires add to warming, BBC News, http://news.bbc.co.uk/2/hi/science/nature/ 4208564.stm, retrieved on 2008-12-09

[9]

[10]

[11] [12]

See also
• • • • • • • • • • Clearcutting Deforestation Forestry Floods and landslides after wildfires International Association of Wildland Fire Keetch-Byram Drought Index List of wildfires National Fire Danger Rating System Ponderosa pine and Douglas fir forests Wildland Firefighter Foundation

[13] [14]

[15] [16] [17] [18] [19] [20]

Notes
[1] [2] Federal Fire and Aviation Operations, 4. ^ (PDF) Interagency Strategy for the Implementation of the Federal Wildland Fire Policy, National Fire & Aviation Executive Board, Directives Task Group, http://www.nifc.gov/fire_policy/pdf/dtg_ppt.pdf, retrieved on 2008-12-09 Greek Fire, Classic Encyclopedia, 30 October 2006, http://1911encyclopedia.org/Greek_Fire, retrieved on 2008-12-23 ^ Flannigan, M.D.; B.D. Amiro, K.A. Logan, B.J. Stocks, and B.M. Wotton (2005), "Forest Fires and Climate Change in the 21st century" (PDF), Mitigation and Adaptation Strategies for Global Change 11: 847, doi:10.1007/s11027-005-9020-7, https://www.firelab.utoronto.ca/pubs/ 2005_flannigan_wotton_etal.pdf NWCG Communicator’s Guide, 4. Interagency Strategy, entire text Fire Information - Wildland Fire Statistics, National Interagency Fire Center, http://www.nifc.gov/fire_info/ lg_fires.htm ^ (PDF) Otways Fire No. 22 - 1982/83 Aspects of fire behaviour. Research Report No.20, Victoria Department of Sustainability and Environment, June 1983,

[21]

[22] [23] [24]

[3]

[4]

[25]

[26]

[5] [6] [7]

[27] [28] [29] [30]

[8]

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[31] ^ Global Fire Initiative: Fire and Invasives, The Nature Conservancy, http://www.tncfire.org/ crosscutting_fandi.htm, retrieved on 2008-12-03 [32] Graham, et al., iv, 8, 11, 15. [33] NWCG Communicator’s Guide, 3. [34] (PDF) New York State Fire Safety Tips, Cornell University, http://www.epr.cornell.edu/docs/ Fire_Safety_Tips.pdf, retrieved on 2008-12-01 [35] Scott, Joe H.; Burgan, Robert E. (June 2005) (PDF), Standard Fire Behavior Fuel Models: A Comprehensive Set for Use with Rothermel’s Surface Fire Spread Model, USDA Forest Service, http://www.firemodels.org/ downloads/behaveplus/publications/ Scott_and_Burgan_RMRS-GTR-153_2005.pdf, retrieved on 2009-02-05 [36] Chronological List of U.S. Billion Dollar Events, NOAA Satellite and Information Service, http://lwf.ncdc.noaa.gov/oa/reports/billionz.html, retrieved on 2009-02-04 [37] Graham, et al., 2 [38] de Souza Costa and Sandberg, 228 [39] NWCG Communicator’s Guide, 5. [40] San-Miguel-Ayanz, et al., 364. [41] Glossary of Wildland Fire Terminology, 73. [42] Scott, A (2000). "The Pre-Quaternary history of fire". Palaeogeography Palaeoclimatology Palaeoecology 164: 281. doi:10.1016/S0031-0182(00)00192-9. edit [43] (PDF) Wildfire Prevention Strategies, National Wildfire Coordinating Group, March 1998, p. 17, http://www.nwcg.gov/pms/docs/wfprevnttrat.pdf, retrieved on 2008-12-03 [44] The Associated Press (16 November 2006), Orangutans in losing battle with slash-and-burn Indonesian farmers, TheStar online, http://thestar.com.my/news/ story.asp?file=/2006/11/16/apworld/ 20061116114312&sec=apworld, retrieved on 2008-12-01 [45] Karki, 7. [46] Karki, 4. [47] Graham, et al., 12 [48] Shea, Neil (July 2008), Under Fire, National Geographic, http://ngm.nationalgeographic.com/2008/07/fireseason/shea-text.html, retrieved on 2008-12-08 [49] Graham, et al., 16. [50] Graham, et al., 9, 16. [51] Billing, 1983 [52] NWCG Communicator’s Guide, 4. [53] Graham, et al., 16. [54] (PDF) The New Generation Fire Shelter, National Wildfire Coordinating Group, March 2003, http://www.nwcg.gov/ pms/pubs/newshelt72.pdf, retrieved on 2009-01-16 [55] Glossary of Wildland Fire Terminology, 69. [56] Wellman, C.H., Gray, J. (2000). "The microfossil record of early land plants". Philosophical Transactions: Biological Sciences 355 (1398): 717–732. doi:10.1098/rstb.2000.0612. http://rstb.royalsocietypublishing.org/content/355/ 1398/717. edit

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Sensing (Western Disaster Center) 64 (10): 977–985, October 1998, doi:0099-1112/6410-977 (inactive 2009-04-12), http://www.westerndisastercenter.org/ DOCUMENTS/PERS_PAPER.pdf [115] Wildfire Detection and Control, Alabama Forestry Commission, http://www.forestry.state.al.us/ WildfireControl.aspx?bv=1&s=0, retrieved on 2009-01-12 [116] Evaluation of three wildfire smoke detection systems, 4 [117] Evaluation of three wildfire smoke detection systems, 5 [118] Evaluation of three wildfire smoke detection systems, 5 [119] Fok, Chien-Liang; Roman, Gruia-Catalin; and Lu, Chenyang (2004-11-29) (PDF), Mobile Agent Middleware for Sensor Networks: An Application Case Study, Washington University in St. Louis, http://cse.seas.wustl.edu/techreportfiles/ getreport.asp?399, retrieved on 2009-01-15 [120] Chaczko, Z.; Ahmad, F. (July, 2005), "Wireless Sensor Network Based System for Fire Endangered Areas", Third International Conference on Information Technology and Applications 2 (4-7): 203–207, doi:10.1109/ICITA.2005.313, http://ieeexplore.ieee.org/search/ wrapper.jsp?arnumber=1488955, retrieved on 2009-01-15 [121] Wireless Weather Sensor Networks for Fire Management, University of Montana - Missoula, http://firecenter.umt.edu/index.php/project/WirelessWeather-Sensor-Networks-for-Fire-Management/ID/ 461d72ad/fuseaction/whatWeDo.projectDetail.htm, retrieved on 2009-01-19 [122] Thomson, Elizabeth A. (2008-09-23), Preventing forest fires with tree power, MIT News, http://web.mit.edu/ newsoffice/2008/trees-0923.html, retrieved on 2009-01-15 [123] Evaluation of three wildfire smoke detection systems, 6 [124] SDSU Tests New Wildfire-Detection Technology, San Diego, CA: San Diego State University, 2005-06-23, http://advancement.sdsu.edu/marcomm/news/ releases/spring2005/pr062305.html, retrieved on 2009-01-12 [125] San-Miguel-Ayanz, et al., 366-369, 373-375. [126] Rochester Institute of Technology (10-4-2003), New Wildfire-detection Research Will Pinpoint Small Fires From 10,000 feet, ScienceDaily, http://www.sciencedaily.com/releases/2003/04/ 030410072055.htm, retrieved on 2009-01-12 [127] Airborne campaign tests new instrumentation for wildfire detection, European Space Agency, 10-11-2006, http://www.esa.int/esaLP/SEMEAE0CYTE_index_0.html, retrieved on 2009-01-12 [128] World fire maps now available online in near-real time, European Space Agency, 2006-05-24, http://www.esa.int/ esaCP/SEMRBH9ATME_Protecting_0.html, retrieved on 2009-01-12

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[129] Earth from Space: California’s ‘Esperanza’ fire, European Space Agency, 3-11-2006, http://www.esa.int/esaEO/ SEMEKMZBYTE_index_0.html, retrieved on 2009-01-12 [130] Hazard Mapping System Fire and Smoke Product, NOAA Satellite and Information Service, http://www.ssd.noaa.gov/PS/FIRE/hms.html, retrieved on 2009-01-15 [131] Ramachandran, Chandrasekar; Misra, Sudip and Obaidat, Mohammad S. (2008-06-09), "A probabilistic zonal approach for swarm-inspired wildfire detection using sensor networks", Int. J. Commun. Syst. 21 (10): 1047–1073, doi:10.1002/dac.937, http://www3.interscience.wiley.com/journal/119817008/ abstract [132] Miller, Jerry; Borne, Kirk; Thomas, Brian; Huang Zhenping; and Chi, Yuechen (PDF), Automated Wildfire Detection Through Artificial Neural Networks, NASA, http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/ 20050180316_2005176776.pdf, retrieved on 2009-01-15 [133] Zhang, Junguo; Li, Wenbin, Han, Ning, and Kan, Jiangming (September, 2008), "Forest fire detection system based on a ZigBee wireless sensor network", Frontiers of Forestry in China (Higher Education Press, co-published with Springer-Verlag GmbH) 3 (3): 369–374, doi:10.1007/s11461-008-0054-3, http://www.springerlink.com/content/ l67347334n258772/fulltext.pdf?page=1 [134] Killough, Jr., Brian D. (2003) (PDF), A Semi-empirical Cellular Automata Model for Wildfire Monitoring From a Geosynchronous Space Platform, College of William & Mary, Department of Applied Science, http://as.wm.edu/ Abstracts/BrianKillough.pdf, retrieved on 2009-02-05 [135] Finney, 1-3. [136] Alvarado, et al., 66-68 [137] Karki, 16 [138] Plucinski, et al., 6. [139] Martell, 1560. [140] Are Big Fires Inevitable, 14. [141] NWCG Communicator’s Guide, 1. [142] Wildland Fire Policy, USDA Forest Service, http://www.fs.fed.us/fire/management/policy.html, retrieved on 2008-12-21 [143] ^ Extreme Events: Wild & Forest Fire, NOAA, http://www.economics.noaa.gov/ ?goal=ecosystems&file=events/fire/, retrieved on 2009-01-07 [144] InDepth: Forces of Nature - Forest Fires, CBS News Online, 6-7-2006, http://www.cbc.ca/news/background/ forcesofnature/forestfires.html, retrieved on 2008-12-23 [145] Climate of 2008 Wildfire Season Summary, National Climatic Data Center, 12-11-2008, http://www.ncdc.noaa.gov/oa/climate/research/2008/ fire08.html, retrieved on 2009-01-07 [146] Our Trial by Fire, onearth.org, 12-1-2007, http://www.onearth.org/article/our-trial-byfire?page=2, retrieved on 2009-01-07

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[147] Are Big Fires Inevitable, 15. [148] van Wagtendonk, 14 [149] Interagency Strategy, 38-40.

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• Karki, Sameer (2002) (PDF), Community Involvement in and Management of Forest Fires in South East Asia, Project FireFight South East Asia, http://www.asiaforests.org/doc/ resources/fire/pffsea/Report_Community.pdf, retrieved on 2009-02-13 • (PDF) Interagency Strategy for the Implementation of Federal Wildland Fire Management Policy, National Interagency Fire Council, 20 June 2003, http://www.nifc.gov/fire_policy/pdf/strategy.pdf, retrieved on 2008-12-21 • Lyons, John W. (6 January 1971), The Chemistry and Uses of Fire Retardants, United States of America: John Wiley & Sons, Inc., ISBN 0471557404, http://www.amazon.com/ Chemistry-Uses-Fire-Retardants/dp/0471557404 • Martell, David L.; Sun, Hua (2008), "The impact of fire suppression, vegetation, and weather on the area burned by lightning-caused forest fires in Ontario." (PDF), Can. J. For. Res. 38 (38): 1547–1563, doi:10.1139/X07-210, https://www.firelab.utoronto.ca/pubs/ 2008_martell_sun.pdf • (PDF) NWCG Communicator’s Guide for Wildland Fire Management: Fire Education, Prevention, and Mitigation Practices, Wildland Fire Overview, National Wildfire Coordinating Group, http://www.nifc.gov/preved/ comm_guide/wildfire/FILES/PDF%20%20FILES/ Linked%20PDFs/2%20Wildland%20fire%20overview.PDF, retrieved on 2008-12-11 • Peuch, Eric (26-28 April 2005), "Firefighting Safety in France", in Butler, B.W.; Alexander, M.E. (PDF), Eighth International Wildland Firefighter Safety Summit - Human Factors - 10 Years Later, Missoula, Montana: The International Association of Wildland Fire, Hot Springs, South Dakota • Plucinski, M.; Gould, J.; McCarthy, G; Hollis, J. (June 2007) (PDF), The Effectiveness and Efficiency of Aerial Firefighting in Australia: Part 1, Bushfire Cooperative Research Centre, ISBN 0-643-06534-2, http://www.bushfirecrc.com/research/downloads/AerialSuppression-Report-Final-web.pdf, retrieved on 2009-03-04 • San-Miguel-Ayanz, Jesus; Ravail, Nicolas; Kelha, Vaino; Ollero, Anibal (2005), "Active Fire Detection for Fire Emergency Management: Potential and Limitations for the Operational Use of Remote Sensing" (PDF), Natural Hazards (Springer) 35: 361–376, doi:10.1007/ s11069-004-1797-2, http://grvc.us.es/publica/revistas/ documentos/R-050.05ActiveFire.pdf, retrieved on 2009-03-05 • van Wagtendonk, Jan W. (1996), "Use of a Deterministic Fire Growth Model to Test Fuel Treatments" (PDF), Sierra Nevada Ecosystem Project: Final report to Congress, vol. II, Assessments and scientific basis for management options. (Davis: University of California, Centers for Water and Wildland Resources): 1155–1166, http://www.werc.usgs.gov/yosemite/vii_c43.pdf, retrieved on 2009-02-05

References
• Alvarado, Ernesto; Sandberg, David V.; Pickford, Stewart G. (Special Issue 1998), "Modeling Large Forest Fires as Extreme Events" (PDF), Northwest Science 72: 66–75, http://www.vetmed.wsu.edu/org_nws/ NWSci%20journal%20articles/1998%20files/ Special%20addition%201/ v72%20p66%20Alvarado%20et%20al.PDF, retrieved on 2009-02-06 • (PDF) Are Big Fires Inevitable? A Report on the National Bushfire Forum, Parliament House, Canberra: Bushfire CRC, 27 February 2007, http://www.bushfirecrc.com/ events/downloads/Forum-report-final-from-printer.pdf, retrieved on 2009-01-09 • de Souza Costa, Fernando; Sandberg, David (2004), "Mathematical model of a smoldering log" (PDF), Combustion and Flame (139): 227–238, http://www.fs.fed.us/pnw/pubs/journals/ pnw_2004_costa001.pdf, retrieved on 2009-02-06 • "Evaluation of three wildfire smoke detection systems" (PDF), Advantage (Forest Engineering Research Institute of Canada (FERIC)) 5 (4), June 2004, http://fire.feric.ca/ 36152002/ EvaluationOfThreeWildfireSmokeDetectionSystem.pdf, retrieved on 2009-01-13 • (PDF) Federal Fire and Aviation Operations Action Plan, National Interagency Fire Center, 18 April 2005, p. 4, http://www.nifc.gov/nicc/administrative/nmac/ correspond/FireOpsPlan.pdf • Finney, Mark A. (March 1998) (PDF), FARSITE: Fire Area Simulator—Model Development and Evaluation, USDA Forest Service, http://www.firemodels.org/downloads/ farsite/publications/fireareaall.pdf, retrieved on 2009-02-05 • (PDF) Fire. The Australian Experience, NSW Rural Fire Service, http://www.bushfire.nsw.gov.au/file_system/ attachments/State08/Attachment_20050308_44889DFD.pdf, retrieved on 2009-02-04 • (PDF) Glossary of Wildland Fire Terminology, National Wildfire Coordinating Group, November 2008, http://www.nwcg.gov/pms/pubs/glossary/pms205.pdf, retrieved on 2008-12-18 • Graham, Russell; McCaffrey, Sarah; Jain, Theresa B. (April 2004), "Science Basis for Changing Forest Structure to Modify Wildfire Behavior and Severity" (2.79MB PDF), Gen. Tech. Rep. RMRS-GTR-120 (Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station: USDA Forest Service), http://www.fs.fed.us/rm/pubs/rmrs_gtr120.pdf, retrieved on 2009-02-06

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From Wikipedia, the free encyclopedia
• van Wagtendonk, Jan W. (2007), "The History and Evolution of Wildland Fire Use" (PDF), Fire Ecology (Association for Fire Ecology) 3 (2): 3–17, http://www.fireecology.net/journal/Vol%203/No%202/ 3(2)%20van%20Wagtendonk-1.pdf, retrieved on 2008-08-24 (U.S. Government public domain material published in Association journal. See WERC Highlights -- April 2008)

Wildfire
• NIFC: NWCG Communicator’s Guide Table of Contents • NOAA: Economic Costs of Wildfires • University of Toronto Fire Management Systems Laboratory Recent Publications • US BLM Fire and Aviation • USFS: Fire and Aviation Management • USFS: Fire and Environmental Research Applications Team Products & Publications • USFS: Fire, Fuel, and Smoke Science Program (Publications) • Wildlandfire.com Wildfire photographs • Wildland Fire Operations Research Group (WFORG): Detection Workshop Presentations

External links
• Bushfire Cooperative Research Centre • International Association of Wildland Fire

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