62-471: The Great Chicago Fire was a conflagration that burned in the American city of Chicago during October 8–10, 1871. The fire killed approximately 300 people, destroyed roughly 3.3 square miles (9 km) of the city including over 17,000 structures, and left more than 100,000 residents homeless. The fire began in a neighborhood southwest of the city center . A long period of hot, dry, windy conditions, and
124-596: A tornado -like vortex that sucks in debris and combustible gases. The phenomenon is sometimes labeled a fire tornado , firenado , fire swirl , or fire twister , but these terms usually refer to a separate phenomenon where a fire has such intensity that it generates an actual tornado. Fire whirls are not usually classifiable as tornadoes as the vortex in most cases does not extend from the surface to cloud base. Also, even in such cases, those fire whirls very rarely are classic tornadoes, as their vorticity derives from surface winds and heat-induced lifting, rather than from
186-415: A claim by Cohn to have been present at the start of the fire. According to Cohn, on the night of the fire, he was gambling in the O'Learys' barn with one of their sons and some other neighborhood boys. When Mrs. O'Leary came out to the barn to chase the gamblers away at around 9:00, they knocked over a lantern in their flight, although Cohn states that he paused long enough to scoop up the money. The argument
248-469: A cow owned by Sullivan's mother. Bales's account does not have consensus. The Chicago Public Library staff criticized his account in their web page on the fire. Despite this, the Chicago city council was convinced of Bales's argument and stated that the actions of Sullivan on that day should be scrutinized after the O'Leary family was exonerated in 1997. Anthony DeBartolo reported evidence in two articles of
310-548: A dry summer, so that winds from the front that moved in that evening were capable of generating rapidly expanding blazes from available ignition sources, which were plentiful in the region. On that hot, dry, and windy autumn day, three other major fires occurred along the shores of Lake Michigan at the same time as the Great Chicago Fire. Some 250 miles (400 km) to the north, the Peshtigo Fire consumed
372-407: A fire swept through the city of Urbana, Illinois , 140 miles (230 km) south of Chicago, destroying portions of its downtown area. Windsor, Ontario , likewise burned on October 12. The city of Singapore, Michigan , provided a large portion of the lumber to rebuild Chicago. As a result, the area was so heavily deforested that the land deteriorated into barren sand dunes that buried the town, and
434-472: A group of men were gambling inside the barn and knocked over a lantern. Still other speculation suggests that the blaze was related to other fires in the Midwest that day . The fire's spread was aided by the city's use of wood as the predominant building material in a style called balloon frame . More than two-thirds of the structures in Chicago at the time of the fire were made entirely of wood, with most of
496-400: A more old-fashioned way of life, and that the fire was caused by people ignoring traditional morality. On the other hand, others believed that a lesson to be learned from the fire was that cities needed to improve their building techniques. Frederick Law Olmsted observed that poor building practices in Chicago were a problem: Chicago had a weakness for "big things", and liked to think that it
558-607: A smaller scale and tiny fire whirls have been generated by very small fires in laboratories. Most of the largest fire whirls are spawned from wildfires. They form when a warm updraft and convergence from the wildfire are present. They are usually 10–50 m (33–164 ft) tall, a few meters (several feet) wide, and last only a few minutes. Some, however, can be more than 1 km (0.6 mi) tall, contain wind speeds over 200 km/h (120 mph), and persist for more than 20 minutes. Fire whirls can uproot trees that are 15 m (49 ft) tall or more. These can also aid
620-576: A tornadic mesocyclone aloft. The phenomenon was first verified in the 2003 Canberra bushfires and has since been verified in the 2018 Carr Fire in California and 2020 Loyalton Fire in California and Nevada. A fire whirl consists of a burning core and a rotating pocket of air. A fire whirl can reach up to 2,000 °F (1,090 °C). Fire whirls become frequent when a wildfire , or especially firestorm , creates its own wind, which can spawn large vortices. Even bonfires often have whirls on
682-485: A tornado-like effect. These fire whirls are likely what drove flaming debris so high and so far. Such debris was blown across the main branch of the Chicago River to a railroad car carrying kerosene . The fire had jumped the river a second time and was now raging across the city's north side. Despite the fire spreading and growing rapidly, the city's firefighters continued to battle the blaze. A short time after
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#1732764827989744-417: A wildfire near Loyalton, California , capable of producing a fire tornado. In controlled small-scale experiments, fire whirls are found to transition to a mode of combustion called blue whirls. The name blue whirl was coined because the soot production is negligible, leading to the disappearance of the yellow color typical of a fire whirl. Blue whirls are partially premixed flames that reside elevated in
806-635: Is not universally accepted. An alternative theory, first suggested in 1882 by Ignatius L. Donnelly in Ragnarok: The Age of Fire and Gravel , is that the fire was caused by a meteor shower . This was described as a "fringe theory" concerning Biela's Comet . At a 2004 conference of the Aerospace Corporation and the American Institute of Aeronautics and Astronautics , engineer and physicist Robert Wood suggested that
868-726: Is now Tornado Memorial County Park. An extreme example of the phenomenon occurred in the aftermath of the 1923 Great Kantō earthquake in Japan, in which a city-wide firestorm in Tokyo produced the conditions required for a gigantic fire whirl that killed 38,000 people in fifteen minutes in the Hifukusho-Ato region of the city. Numerous large fire whirls (some tornadic) that developed after lightning struck an oil storage facility near San Luis Obispo , California , on 7 April 1926, produced significant structural damage well away from
930-408: Is often a fire investigation to determine the cause of the fire. During a conflagration a significant movement of air and combustion products occurs. Hot gaseous products of combustion move upward, causing the influx of more dense cold air to the combustion zone. Sometimes, the influx is so intense that the fire grows into a firestorm . Inside a building, the intensity of gas exchange depends on
992-667: The 2003 Canberra bushfires in Canberra , Australia , a violent fire whirl was documented. It was calculated to have horizontal winds of 160 mph (260 km/h) and vertical air speed of 93 mph (150 km/h), causing the flashover of 300 acres (120 ha) in 0.04 seconds. It was the first known fire whirl in Australia to have EF3 wind speeds on the Enhanced Fujita scale . A fire whirl, of reportedly uncommon size for New Zealand wildfires, formed on day three of
1054-482: The 2017 Port Hills fires in Christchurch . Pilots estimated the fire column to be 100 m (330 ft) high. Residents in the city of Redding, California , while evacuating the area from the massive Carr Fire in late July 2018, reported seeing pyrocumulonimbus clouds and tornado-like behaviour from the firestorm, resulting in uprooted trees, cars, structures and other wind related damages in addition to
1116-492: The Chicago Fire Department had 185 firefighters with just 17 horse-drawn steam pumpers to protect the entire city. The initial response by the fire department was timely, but due to an error by the watchman, Matthias Schaffer, the firefighters were initially sent to the wrong place, allowing the fire to grow unchecked. An alarm sent from the area near the fire also failed to register at the courthouse where
1178-601: The Chicago Tribune (October 8, 1997, and March 3, 1998, reprinted in Hyde Park Media ) suggesting that Louis M. Cohn may have started the fire during a craps game. Following his death in 1942, Cohn bequeathed $ 35,000 which was assigned by his executors to the Medill School of Journalism at Northwestern University . The bequest was given to the school on September 28, 1944, and the dedication contained
1240-490: The Common Council of London gave 1,000 guineas, as well as £7,000 from private donations. In Greenock , Scotland (pop. 40,000) a town meeting raised £518 on the spot. Cincinnati , Cleveland , and Buffalo , all commercial rivals, donated hundreds and thousands of dollars. Milwaukee , along with other nearby cities, helped by sending fire-fighting equipment. Food, clothing and books were brought by train from all over
1302-540: The bombing of Hamburg , particularly those of 27–28 July 1943, were studied. Throughout the 1960s and 1970s, particularly in 1978–1979, fire whirls ranging from the transient and very small to intense, long-lived tornado-like vortices capable of causing significant damage were spawned by fires generated from the 1000 MW Météotron , a series of large oil wells located in the Lannemezan plain of France used for testing atmospheric motions and thermodynamics. During
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#17327648279891364-414: The pyro- prefix, fire-induced clouds are called pyrocumulus and pyrocumulonimbus . Larger fire vortices are similarly being viewed. Based on vortex scale, the classification terms of pyronado , "pyrotornado" , and "pyromesocyclone" have been proposed. During the 1871 Peshtigo fire , the community of Williamsonville, Wisconsin , was burned by a fire whirl; the area where Williamsonville once stood
1426-637: The 'spotting' ability of wildfires to propagate and start new fires as they lift burning materials such as tree bark. These burning embers can be blown away from the fire-ground by the stronger winds aloft. Fire whirls can be common within the vicinity of a plume during a volcanic eruption . These range from small to large and form from a variety of mechanisms, including those akin to typical fire whirl processes, but can result in Cumulonimbus flammagenitus (cloud) spawning landspouts and waterspouts or even to develop mesocyclone-like updraft rotation of
1488-609: The City Council passed the ordinance to establish the free Chicago Public Library , starting with the donation from the United Kingdom of more than 8,000 volumes. The fire also led to questions about development in the United States. Due to Chicago's rapid expansion at that time, the fire led to Americans reflecting on industrialization. Based on a religious point of view, some said that Americans should return to
1550-537: The South Branch of the Chicago River and an area that had previously thoroughly burned would act as a natural firebreak . All along the river, however, were lumber yards, warehouses, and coal yards, as well as barges, and numerous bridges across the river. As the fire grew, the southwest wind intensified and the temperature rose, causing structures to catch fire from the heat and from burning debris blown by
1612-480: The United Kingdom spurred the establishment of the Chicago Public Library . The fire is said to have started at about 8:30 p.m. on October 8, in or around a small barn belonging to the O'Leary family that bordered the alley behind 137 W. DeKoven Street . The shed next to the barn was the first building to be consumed by the fire. City officials never determined the cause of the blaze, but
1674-536: The United States had been distrustful of Catholics (or papists , as they were often called) since its beginning, carrying over attitudes in England in the 17th century; as an Irish Catholic, Mrs. O'Leary was a target of both anti-Catholic and anti-Irish sentiment. This story was circulating in Chicago even before the flames had died out, and it was noted in the Chicago Tribune ' s first post-fire issue. In 1893
1736-446: The basement to be released. At 2:30 a.m. on the 9th, the cupola of the courthouse collapsed, sending the great bell crashing down. Some witnesses reported hearing the sound from a mile (1.6 km) away. As more buildings succumbed to the flames, a major contributing factor to the fire's spread was a meteorological phenomenon known as a fire whirl . As hot air rises, it comes into contact with cooler air and begins to spin, creating
1798-467: The burned district are still standing: St. Michael's Church and the Pumping Station were both gutted in the fire, but their exteriors survived, and the buildings were rebuilt using the surviving walls. Additionally, though the inhabitable portions of the building were destroyed, the bell tower of St. James Cathedral survived the fire and was incorporated into the rebuilt church. The stones near
1860-418: The city as well are safe." For two weeks Sheridan's men patrolled the streets, guarded the relief warehouses, and enforced other regulations. On October 24 the troops were relieved of their duties and the volunteers were mustered out of service. Of the approximately 324,000 inhabitants of Chicago in 1871, 90,000 Chicago residents (about 28% of the population) were left homeless. 120 bodies were recovered, but
1922-401: The city began to rewrite its fire standards, spurred by the efforts of leading insurance executives, and fire-prevention reformers such as Arthur C. Ducat . Chicago soon developed one of the country's leading fire-fighting forces. Business owners and land speculators such as Gurdon Saltonstall Hubbard quickly set about rebuilding the city. The first load of lumber for rebuilding was delivered
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1984-590: The continent. Mayor Mason placed the Chicago Relief and Aid Society in charge of the city's relief efforts. Operating from the First Congregational Church , city officials and aldermen began taking steps to preserve order in Chicago. Price gouging was a key concern, and in one ordinance, the city set the price of bread at 8¢ for a 12-ounce (340 g) loaf. Public buildings were opened as places of refuge, and saloons closed at 9 in
2046-492: The day the last burning building was extinguished. By the World's Columbian Exposition 22 years later, Chicago hosted more than 21 million visitors. The Palmer House hotel burned to the ground in the fire 13 days after its grand opening. Its developer, Potter Palmer , secured a loan and rebuilt the hotel to higher standards, across the street from the original, proclaiming it to be "The World's First Fireproof Building". In 1956,
2108-529: The death toll may have been as high as 300. The county coroner speculated that an accurate count was impossible, as some victims may have drowned or had been incinerated, leaving no remains. In the days and weeks following the fire, monetary donations flowed into Chicago from around the country and abroad, along with donations of food, clothing, and other goods. These donations came from individuals, corporations, and cities. New York City gave $ 450,000 along with clothing and provisions, St. Louis gave $ 300,000, and
2170-468: The evening for the week following the fire. Many people who were left homeless after the incident were never able to get their normal lives back since all their personal papers and belongings burned in the conflagration. After the fire, A. H. Burgess of London proposed an "English Book Donation", to spur a free library in Chicago, in their sympathy with Chicago over the damages suffered. Libraries in Chicago had been private with membership fees. In April 1872,
2232-401: The fire began when a fragment of Biela's Comet impacted the Midwest. Biela's Comet had broken apart in 1845 and had not been observed since. Wood argued that four large fires took place, all on the same day, all on the shores of Lake Michigan (see related events ), suggesting a common root cause. Eyewitnesses reported sighting spontaneous ignitions, lack of smoke, "balls of fire" falling from
2294-602: The fire itself. As of August 2, 2018, a preliminary damage survey, led by the National Weather Service (NWS) in Sacramento, California , suggested the July 26th fire whirl was equivalent to an EF3 tornado with winds in excess of 143 mph (230 km/h). On August 15, 2020, for the first time in its history, the U.S. National Weather Service issued a tornado warning for a pyrocumulonimbus created by
2356-468: The fire jumped the river, a burning piece of timber lodged on the roof of the city's waterworks . Within minutes, the interior of the building was engulfed in flames and the building was destroyed. With it, the city's water mains went dry and the city was helpless. The fire burned unchecked from building to building, block to block. Late in the evening of October 9, it started to rain, but the fire had already started to burn itself out. The fire had spread to
2418-483: The fire started when Daniel "Pegleg" Sullivan, who first reported the fire, ignited hay in the barn while trying to steal milk. Part of Bales's evidence includes an account by Sullivan, who claimed in an inquiry before the Fire Department of Chicago on November 25, 1871, that he saw the fire coming through the side of the barn and ran across DeKoven Street to free the animals from the barn, one of which included
2480-401: The fire started, but stories of the cow began to spread across the city. Catherine O'Leary seemed the perfect scapegoat : she was a poor, Irish Catholic immigrant. During the latter half of the 19th century, anti-Irish sentiment was strong in Chicago and throughout the United States. This was intensified as a result of the growing political power of the city's Irish population. Furthermore,
2542-403: The fire watchmen were, while the firefighters were tired from having fought numerous small fires and one large fire in the week before. These factors combined to turn a small barn fire into a conflagration. When firefighters finally arrived at DeKoven Street, the fire had grown and spread to neighboring buildings and was progressing toward the central business district. Firefighters had hoped that
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2604-459: The fire, killing two. Many whirlwinds were produced by the four-day-long firestorm coincident with conditions that produced severe thunderstorms , in which the larger fire whirls carried debris 5 km (3.1 mi) away. Fire whirls were produced in the conflagrations and firestorms triggered by firebombings of European and Japanese cities during World War II and by the atomic bombings of Hiroshima and Nagasaki . Fire whirls associated with
2666-417: The fire. Conflagrations can cause casualties including deaths or injuries from burns , trauma due to collapse of structures and attempts to escape, and smoke inhalation . Firefighting is the practice of extinguishing a conflagration, protecting life and property and minimizing damage and injury. One of the goals of fire prevention is to avoid conflagrations. When a conflagration is extinguished, there
2728-419: The houses and buildings being topped with highly combustible tar or shingle roofs. All of the city's sidewalks and many roads were also made of wood. Compounding this problem, Chicago received only 1 inch (25 mm) of rain from July 4 to October 9, causing severe drought conditions before the fire, while strong southwest winds helped to carry flying embers toward the heart of the city. In 1871,
2790-563: The lake to the east, the town of Holland, Michigan , and other nearby areas burned to the ground. Some 100 miles (160 km) to the north of Holland, the lumbering community of Manistee also went up in flames in what became known as the Great Michigan Fire . Farther east, along the shore of Lake Huron , the Port Huron Fire swept through Port Huron, Michigan and much of Michigan 's "Thumb" . On October 9, 1871,
2852-456: The mixtures also become explosive, a situation unlikely to occur from meteorites. Methane gas is lighter than air and thus does not accumulate near the ground; any localized pockets of methane in the open air rapidly dissipate. Moreover, if a fragment of an icy comet were to strike the Earth, the most likely outcome, due to the low tensile strength of such bodies, would be for it to disintegrate in
2914-727: The plume itself and/or of the cumulonimbi, which can spawn tornadoes similar to those in supercells . Pyrocumulonimbi generated by large fires on rare occasions also develop in a similar way. There are currently three widely recognized types of fire whirls: There is evidence suggesting that the fire whirl in the Hifukusho-ato area, during the 1923 Great Kantō earthquake , was of type 3. Other mechanism and fire whirl dynamics may exist. A broader classification of fire whirls suggested by Forman A. Williams includes five different categories: The meteorological community views some fire-induced phenomena as atmospheric phenomena. Using
2976-414: The rapid spread of the fire due to a long drought in that year's summer, strong winds from the southwest, and the rapid destruction of the water pumping system explain the extensive damage of the mainly wooden city structures. There has been much speculation over the years on a single start to the fire. The most popular tale blames Mrs. O'Leary's cow, which allegedly knocked over a lantern; others state that
3038-571: The remaining structures on the original O'Leary property at 558 W. DeKoven Street were torn down for construction of the Chicago Fire Academy, a training facility for Chicago firefighters, known as the Quinn Fire Academy or Chicago Fire Department Training Facility. A bronze sculpture of stylized flames, entitled Pillar of Fire by Egon Weiner , was erected on the point of origin in 1961. The following structures from
3100-400: The reporter Michael Ahern retracted the "cow-and-lantern" story, admitting it was fabricated, but even his confession was unable to put the legend to rest. Although the O'Learys were never officially charged with starting the fire, the story became so engrained in local lore that Chicago's city council officially exonerated them—and the cow—in 1997. Amateur historian Richard Bales has suggested
3162-515: The size and location of openings in walls and floors, the ceiling height, and the amount and characteristics of the combustible materials . Fire whirl A fire whirl , fire devil or fire tornado is a whirlwind induced by a fire and often (at least partially) composed of flame or ash . These start with a whirl of wind , often made visible by smoke , and may occur when intense rising heat and turbulent wind conditions combine to form whirling eddies of air. These eddies can contract to
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#17327648279893224-417: The sky, and blue flames. According to Wood, these accounts suggest that the fires were caused by the methane that is commonly found in comets. Meteorites are not known to start or spread fires and are cool to the touch after reaching the ground, so this theory has not found favor in the scientific community. Methane-air mixtures become flammable only when the methane concentration exceeds 5%, at which point
3286-605: The sparsely populated areas of the north side, having thoroughly consumed the densely populated areas. Once the fire had ended, the smoldering remains were still too hot for a survey of the damage to be completed for many days. Eventually, the city determined that the fire destroyed an area about 4 miles (6 km) long and averaging 3 ⁄ 4 mile (1 km) wide, encompassing an area of more than 2,000 acres (809 ha). Destroyed were more than 73 miles (117 km) of roads, 120 miles (190 km) of sidewalk, 2,000 lampposts, 17,500 buildings, and $ 222 million in property, which
3348-447: The top of the tower are still blackened from the soot and smoke. Almost from the moment the fire broke out, various theories about its cause began to circulate. The most popular and enduring legend maintains that the fire began in the O'Leary barn as Mrs. O'Leary was milking her cow. The cow kicked over a lantern (or an oil lamp in some versions), setting fire to the barn. The O'Leary family denied this, stating that they were in bed before
3410-399: The town had to be abandoned. Conflagration A conflagration is a large fire . Conflagrations often damage human life, animal life, health, and/or property. A conflagration can begin accidentally or be intentionally created ( arson ). A very large fire can produce a firestorm , in which the central column of rising heated air induces strong inward winds, which supply oxygen to
3472-406: The town of Peshtigo, Wisconsin , along with a dozen other villages. It killed 1,200 to 2,500 people and charred approximately 1.5 million acres (6,100 km). The Peshtigo Fire remains the deadliest in American history but the remoteness of the region meant it was little noticed at the time, due to the fact that one of the first things that burned were the telegraph lines to Green Bay. Across
3534-460: The upper atmosphere, leading to a meteor air burst like the Tunguska event . The specific choice of Biela's Comet does not match with the dates in question, as the 6-year period of the comet's orbit did not intersect that of the Earth until 1872, one full year after the fire, when a large meteor shower was observed. A common cause for the fires in the Midwest in late 1871 is that the area had had
3596-471: The wind. Around midnight, flaming debris blew across the river and landed on roofs and the South Side Gas Works. With the fire across the river and moving rapidly toward the heart of the city, panic set in. About this time, Mayor Roswell B. Mason sent messages to nearby towns asking for help. When the courthouse caught fire, he ordered the building to be evacuated and the prisoners jailed in
3658-541: The wooden construction prevalent in the city, led to the conflagration spreading quickly. The fire leapt the south branch of the Chicago River and destroyed much of central Chicago and then crossed the main stem of the river, consuming the Near North Side . Help flowed to the city from near and far after the fire. The city government improved building codes to stop the rapid spread of future fires and rebuilt rapidly to those higher standards. A donation from
3720-459: Was about a third of the city's valuation in 1871. On October 11, 1871, General Philip H. Sheridan came quickly to the aid of the city and was placed in charge by a proclamation, given by mayor Roswell B. Mason : "The Preservation of the Good Order and Peace of the city is hereby intrusted to Lieut. General P.H. Sheridan, U.S. Army." To protect the city from looting and violence, the city
3782-434: Was outbuilding New York. It did a great deal of commercial advertising in its house-tops. The faults of construction as well as of art in its great showy buildings must have been numerous. Their walls were thin, and were overweighted with gross and coarse misornamentation. Olmsted also believed that with brick walls, and disciplined firemen and police, the deaths and damage caused would have been much less. Almost immediately,
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#17327648279893844-511: Was put under martial law for two weeks under Gen. Sheridan's command structure with a mix of regular troops, militia units, police, and a specially organized civilian group "First Regiment of Chicago Volunteers." Former Lieutenant-Governor William Bross, and part owner of the Tribune , later recollected his response to the arrival of Gen. Sheridan and his soldiers: "Never did deeper emotions of joy overcome me. Thank God, those most dear to me and
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