User:RandomInfinity17/Xenia comparison

{{Legend|red|Same from orginial article}} {{Legend|Orange|Original text that was copied}} {{Legend|green|Added/Unique to new article}}

Context: The 1974 Xenia tornado page was created after little discussion on the talk page of 1974 Super Outbreak, 1 and 2. There then was a deletion discussion for the article where it was kept as it was notable. The note at the top said, "Whether or not the article is a WP:CONTENTFORK depends on whether or not the article will be expanded beyond content taken from another article and there seems to be the sense that this expansion will occur." I created this page to compare the 1974 Super Outbreak article before any data was split away for the new article and the article in its current state to see how much is original and if this is still a content fork.

See original sections for credit, the text depicted are only text (no images, infoboxes, references, etc.)

Meteorological synopsis section
A powerful springtime low pressure system developed across the North American Interior Plains on April 1. While moving into the Mississippi and Ohio Valley areas, a surge of unusually moist air intensified the storm further, while there were sharp temperature contrasts between both sides of the system. Officials at NOAA and in the National Weather Service forecast offices were expecting a severe weather outbreak on April 3, but not to the extent that ultimately occurred. Several F2 and F3 tornadoes had struck portions of the Ohio Valley and the South in a separate, earlier outbreak on April 1 and 2, which included three killer tornadoes in Kentucky, Alabama, and Tennessee. The town of Campbellsburg, northeast of Louisville, was hard-hit in this earlier outbreak, with a large portion of the town destroyed by an F3. Between the two outbreaks, an additional tornado was reported in Indiana in the early morning hours of April 3, several hours before the official start of the outbreak. On Wednesday, April 3, severe weather watches already were issued from the morning from south of the Great Lakes, while in portions of the Upper Midwest, snow was reported, with heavy rain falling across central Michigan and much of Ontario.

By 12:00 UTC on April 3, a large-scale trough extended over most of the contiguous United States, with several modest shortwaves rotating around the broad base of the trough. The mid-latitude low-pressure center over Kansas continued to deepen to 980 mb, and wind speeds at the 850-mb level increased to 50 kn (25.7 m/s) over portions of Louisiana, Mississippi, and Alabama. Due to significant moisture advection, destabilization rapidly proceeded apace; the warm front near the Gulf Coast dissipated and then redeveloped northward over the Ohio River valley. Consequently, CAPE levels in the region rose to 1,000 J/kg. However, a warm temperature plume in the elevated mixed layer kept thunderstorms from initiating at the surface. Meanwhile, a large mesoscale convective system (MCS) that had developed overnight in Arkansas continued to strengthen due to strong environmental lapse rates. Later in the day, strong daytime heating caused instability to further rise. By 18:00 UTC, CAPE values in excess of 2,500 J/kg were present over the lower Ohio and the Mississippi Valley. As wind speeds in the troposphere increased, Large-scale lifting overspread the warm sector. At the same time, the forward-propagating MCS spread into the Tennessee and Ohio valleys, where it evolved into the first of three main convection bands that produced tornadoes. This first convective band moved rapidly northeast, at times reaching speeds of about 60 kn (30.9 m/s). However, thunderstorm activity, for the moment, remained mostly elevated in nature.

By 16:30 UTC, the large MCS began to splinter into two sections: the southern part slowed, lagging into southeast Tennessee, while the northern part accelerated, reaching Pennsylvania by 19:30 UTC. The split was related to several factors, including a band of subsidence over eastern Kentucky and western West Virginia; local downslope winds over the Appalachians; and an inversion over the same area. These factors allowed the northern part of the MCS to accelerate due to efficient ducting, while the southern part slowed as the boundary layer warmed and moistened. Numerous surface-based supercells began to develop in the southern area, beginning with one that produced an F3 tornado at about 16:30 UTC near Cleveland, Tennessee. Meanwhile, a new band of scattered thunderstorms developed at 15:00 UTC over eastern Arkansas and Missouri; over the next four hours, this band became the focus for several intense supercells, starting in eastern Illinois and southern Indiana. In the wake of the MCS, backing low-level winds, rapid diurnal destabilization, and perhaps cool, mid-level advection had occurred over the warm sector, weakening the convective inhibition (CINH) layer, and favorable wind profiles bolstered helicity to over 230 m2/s²—a combination of factors conducive to tornadogenesis. Consequently, the storms increased in intensity and coverage as they moved into Illinois, Indiana, and northern Kentucky, producing several tornadoes, including the first F5 tornado of the day, at 19:20 UTC, near Depauw, Indiana. Several of the storms to form between 19:20 and 20:20 UTC became significant, long-lived supercells, producing many strong or violent tornadoes, including three F5s at Depauw; Xenia, Ohio; and Brandenburg, Kentucky. These storms formed the second of three convective bands to generate tornadoes.

While violent tornado activity increased over the warm sector, a third band of convection developed at about 16:00 UTC and extended from near St. Louis into west-central Illinois. Based upon real-time satellite imagery and model data, differential positive vorticity advection coincided with the left exit region of an upper-level jet streak that reached wind speeds of up to 130 kn (66.9 m/s), thereby enhancing thunderstorm growth. Storms grew rapidly in height and extent, producing baseball-sized hail by 17:20 UTC in Illinois and, shortly thereafter, in St. Louis, Missouri, which reported a very severe thunderstorm early in the afternoon that, while not producing a tornado, was the costliest storm to hit the city up to that time. By 19:50 UTC, supercells producing F3 tornadoes hit the Decatur and Normal areas in Illinois. As thunderstorms moved into the warmer, moister air mass over eastern Illinois and Indiana, they produced longer-lived tornadoes—one of which began near Otterbein and ended near Valentine in Indiana, a distance of 121 mi.

Meanwhile, by 00:00 UTC the southern half of the first convective band became indistinguishable from new convection that had formed farther south over Alabama and Tennessee in connection with convective band two. In this area, increasing west-southwesterly wind shear at all levels of the troposphere, juxtaposed over near-parallel outflow boundaries, allowed successive supercells, all producing strong, long-tracked tornadoes, to develop unconstrained by their outflow in a broad region from eastern Mississippi to southern Tennessee. These storms, forming after 23:00 UTC, produced some of the most powerful tornadoes of the outbreak, including a large and long-tracked F4 that struck the western and central portions of Alabama, tracking for just over 110 mi, two F5s that both slammed into Tanner, causing extensive fatalities, an extremely potent F5 that devastated Guin in Alabama, and multiple violent, deadly tornadoes that affected and caused fatalities in Tennessee.

Michigan was not hit as hard as neighboring states or Windsor, with only one deadly tornado that hit near Coldwater and Hillsdale, killing people in mobile homes; however, thunderstorm downpours caused flash floods, and north of the warm front in the Upper Peninsula, heavy snowfall was reported. Activity in the south moved towards the Appalachians during the overnight hours and produced the final tornadoes across the southeast during the morning of April 4. A series of studies by Dr. Tetsuya T. Fujita in 1974–75—which were later cited in a 2004 survey by Risk Management Solutions—found that three-quarters of all tornadoes in the 1974 Super Outbreak were produced by 30 'families' of tornadoes—multiple tornadoes spawned in succession by a single thunderstorm cell. The majority of these were long-lived and long-tracked individual supercells.

=== Xenia section (of 18 February 2023, before the first piece of data was split away) === The tornado that struck the city of Xenia, Ohio stands as the deadliest individual tornado of the 1974 Super Outbreak, killing 32 people and destroying a significant portion of the town. The tornado formed near Bellbrook, Ohio, southwest of Xenia, at about 4:30 pm EDT. It began as a moderate-sized tornado, then intensified while moving northeast at about 50 mph (80 km/h). The tornado exhibited a multiple-vortex structure and became very large as it approached town. Gil Whitney, the weather specialist for WHIO-TV in Dayton, alerted viewers in Montgomery and Greene Counties (where Xenia is located) about the possible tornado, broadcasting the radar image of the supercell with a pronounced hook echo on the rear flank of the storm several minutes before it actually struck. The storm was visible on radar because of raindrops wrapping around the circulation. The massive tornado slammed into the western part of Xenia, completely flattening the Windsor Park and Arrowhead subdivisions at F5 intensity, and sweeping away entire rows of brick homes with little debris left behind in some areas. Extensive wind-rowing of debris occurred in nearby fields.

When the storm reached central Xenia at 4:40 pm, apartment buildings, homes, businesses, churches, and schools including Xenia High School were destroyed. Students in the school, practicing for a play, took cover in the main hallway seconds before the tornado dropped a school bus onto the stage where they had been practicing and extensively damaged the school building. Several railroad cars were lifted and blown over as the tornado passed over a moving Penn Central freight train in the center of town. It toppled headstones in Cherry Grove Cemetery, then moved through the length of the downtown business district, passing west of the courthouse (which sustained some exterior damage). Numerous businesses in downtown Xenia were heavily damaged or destroyed, and several people were killed at the A&W Root Beer stand as the building was flattened. At the time, this was the state's highest tornadic death toll for a single building since 1953. Past downtown, the tornado continued into the Pinecrest Garden district, which was extensively affected.

The Xenia tornado was recorded on film by one resident, and its sound was recorded on tape by a Mr. Brokeshoulder from inside an apartment complex. Before the tornado hit the building, the resident left the tape recorder on, and it was found after the storm. At the same time a few blocks away, 16-year-old Xenia resident Bruce Boyd captured 3 minutes and 21 seconds of footage with a "Super-8" 8mm movie camera, a pre-1973 model without sound recording capability. The footage was later paired with the nearby tape recording. Boyd's film shows multiple vortices within the larger circulation as the storm swept through Xenia. Upon exiting Xenia, the tornado passed through Wilberforce, heavily damaging several campus and residential buildings of Wilberforce University. Central State University also sustained considerable damage, and a water tower there was toppled. Afterwards, the tornado weakened before dissipating in Clark County near South Vienna, traveling a little over 30 mi. Its maximum width was a half-mile (0.8 km) in Xenia. The same parent storm later spawned a weaker tornado northeast of Columbus in Franklin County.

A total of 32 people lost their lives in the tornado, and about 1,150 were injured in Xenia, several of whom took proper shelter. In addition to the direct fatalities, two Ohio Air National Guardsmen deployed for disaster assistance were killed on April 17 when a fire swept through their temporary barracks in a furniture store. The memorial in downtown Xenia lists 34 deaths, in honor of the two Guardsmen. About 1,400 buildings (roughly half of the town) were heavily damaged or destroyed. Damage was estimated at US$100 million ($471.7 million in 2013 dollars).

President Richard Nixon made an unannounced visit to Xenia a few days later. It would be the first (and only) city affected by the 1974 Super Outbreak that he would visit. Upon inspecting the damage, he said: "As I look back over the disasters, I saw the earthquake in Anchorage in 1964; I saw the hurricanes... Hurricane Camille in 1969 down in Mississippi, and I saw Hurricane Agnes in Wilkes-Barre, Pennsylvania. And it is hard to tell the difference among them all, but I would say in terms of destruction, just total devastation, this is the worst I have seen." President Nixon immediately declared Xenia a disaster area. Although the Federal Disaster Relief Act was already introduced in 1973, it still had not passed Congress. The 1974 Super Outbreak disaster was a catalyst for accelerated passage of the act through Congress in 1974, according to Nixon. It took several months for the city to recover from the tornado, with the help of the Red Cross and the Ohio National Guard assisting the recovery efforts. Most of the town was quickly re-built afterward. In recognition of their coverage of the tornado under difficult circumstances, the staff of the Xenia Daily Gazette won the Pulitzer Prize for Spot News Reporting in 1975. The Xenia tornado was one of two rated F5 that affected Ohio during the outbreak, the other striking the Cincinnati area (see Cincinnati/Sayler Park area tornado, below). Xenia was later struck by two other tornadoes—both a smaller one in April 1989 and a larger one in September 2000, which was an F4 tornado that killed one and injured about 100 in an area parallel to and just north of the 1974 path. Before the 1974 storm, the city had no tornado sirens. After the F5 tornado hit on April 3, 1974, ten sirens were installed across the area.

Dr. Ted Fujita and a team of colleagues undertook a 10-month study of the 1974 Super Outbreak. Along with discovering much about tornadoes which was not known before, such as the downburst and the microburst, and assessing damage to surrounding structures, the Xenia tornado was determined to be the worst of the 148 storms. Fujita initially assigned a preliminary rating of F6 intensity ± 1 scale, before deeming F6 ratings "inconceivable".

Meteorological synopsis section
A powerful springtime low pressure system developed across the North American Interior Plains on April 1. While moving into the Mississippi and Ohio Valley areas, a surge of unusually moist air intensified the storm further, while there were sharp temperature contrasts between both sides of the system. Officials at NOAA and in the National Weather Service forecast offices were expecting a severe weather outbreak on April 3, but not to the extent that ultimately occurred. Several F2 and F3 tornadoes had struck portions of the Ohio Valley and the South in a separate, earlier outbreak on April 1 and 2, which included three killer tornadoes in Kentucky, Alabama, and Tennessee. The town of Campbellsburg, northeast of Louisville, was hard-hit in this earlier outbreak, with a large portion of the town destroyed by an F3. Between the two outbreaks, an additional tornado was reported in Indiana in the early morning hours of April 3, several hours before the official start of the outbreak. On Wednesday, April 3, severe weather watches already were issued from the morning from south of the Great Lakes, while in portions of the Upper Midwest, snow was reported, with heavy rain falling across central Michigan and much of Ontario.

Summary/Impact
The tornado formed near Bellbrook, Ohio, southwest of Xenia, at about 4:30 pm EDT. It began as a moderate-sized tornado, then intensified while moving northeast at about 50 mph. The tornado exhibited a multiple-vortex structure, which was described as a "pair of funnels coming together". and became very large as it approached town. Gil Whitney, the weather specialist for WHIO-TV in Dayton, alerted viewers in Montgomery and Greene Counties (where Xenia is located) about the possible tornado, broadcasting the radar image of the supercell with a pronounced hook echo on the rear flank of the storm several minutes before it actually struck. The storm was visible on radar because of raindrops wrapping around the circulation. The massive tornado slammed into the western part of Xenia, completely flattening the Windsor Park and Arrowhead subdivisions at F5 intensity, and sweeping away entire rows of brick homes with little debris left behind in some areas. Extensive wind-rowing of debris occurred in nearby fields.

When the storm reached central Xenia at 4:40 pm, apartment buildings, homes, businesses, churches, and schools including Xenia High School were destroyed. At this time, the tornado was videotaped and was observed to have "as many as five subvortices merging into one" tornado. Students in the school, practicing for a play, took cover in the main hallway seconds before the tornado dropped a school bus onto the stage where they had been practicing and extensively damaged the school building. Several railroad cars were lifted and blown over as the tornado passed over a moving Penn Central freight train in the center of town. It toppled headstones in Cherry Grove Cemetery, then moved through the length of the downtown business district, passing west of the courthouse (which sustained some exterior damage). Numerous businesses in downtown Xenia were heavily damaged or destroyed, and several people were killed at the A&W Root Beer stand as the building was flattened. At the time, this was the state's highest tornadic death toll for a single building since 1953. Past downtown, the tornado continued into the Pinecrest Garden district, which was extensively affected.

The Xenia tornado was recorded on film by one resident, and its sound was recorded on tape by a Mr. Brokeshoulder from inside an apartment complex. Before the tornado hit the building, the resident left the tape recorder on, and it was found after the storm. At the same time a few blocks away, 16-year-old Xenia resident Bruce Boyd captured 3 minutes and 21 seconds of footage with a "Super-8" 8mm movie camera, a pre-1973 model without sound recording capability. The footage was later paired with the nearby tape recording. Boyd's film shows multiple vortices within the larger circulation as the storm swept through Xenia. Upon exiting Xenia, the tornado passed through Wilberforce, heavily damaging several campus and residential buildings of Wilberforce University. Central State University also sustained considerable damage, and a water tower there was toppled. Afterwards, the tornado weakened before dissipating in Clark County near South Vienna, traveling a little over 30 mi. Its maximum width was a half-mile (0.8 km) in Xenia. The same parent storm later spawned a weaker tornado northeast of Columbus in Franklin County.

A total of 32 people lost their lives in the tornado, and about 1,150 were injured in Xenia, several of whom took proper shelter. In addition to the direct fatalities, two Ohio Air National Guardsmen deployed for disaster assistance were killed on April 17 when a fire swept through their temporary barracks in a furniture store. The memorial in downtown Xenia lists 34 deaths, in honor of the two Guardsmen. About 1,400 buildings (roughly half of the town) were heavily damaged or destroyed. Damage was estimated at US$100 million ($471.7 million in 2013 dollars).

Aftermath
President Richard Nixon made an unannounced visit to Xenia a few days later. It would be the first (and only) city affected by the 1974 Super Outbreak that he would visit. Upon inspecting the damage, he said: "As I look back over the disasters, I saw the earthquake in Anchorage in 1964; I saw the hurricanes... Hurricane Camille in 1969 down in Mississippi, and I saw Hurricane Agnes in Wilkes-Barre, Pennsylvania. And it is hard to tell the difference among them all, but I would say in terms of destruction, just total devastation, this is the worst I have seen." President Nixon immediately declared Xenia a disaster area. Although the Federal Disaster Relief Act was already introduced in 1973, it still had not passed Congress. The 1974 Super Outbreak disaster was a catalyst for accelerated passage of the act through Congress in 1974, according to Nixon. It took several months for the city to recover from the tornado, with the help of the Red Cross and the Ohio National Guard assisting the recovery efforts. Most of the town was quickly re-built afterward. In recognition of their coverage of the tornado under difficult circumstances, the staff of the Xenia Daily Gazette won the Pulitzer Prize for Spot News Reporting in 1975. The Xenia tornado was one of two rated F5 that affected Ohio during the outbreak, the other striking the Cincinnati area (see Cincinnati/Sayler Park area tornado). Xenia was later struck by two other tornadoes—both a smaller one in April 1989 and a larger one in September 2000, which was an F4 tornado that killed one and injured about 100 in an area parallel to and just north of the 1974 path. Before the 1974 storm, the city had no tornado sirens. After the F5 tornado hit on April 3, 1974, ten sirens were installed across the area.

Dr. Ted Fujita and a team of colleagues from the University of Chicago, University of Oklahoma, and National Severe Storms Laboratory, undertook a 10-month study of the 1974 Super Outbreak. Along with discovering much about tornadoes which was not known before, such as the downburst and the microburst, and assessing damage to surrounding structures, the Xenia tornado was determined to be the worst of the 148 storms. Fujita initially assigned a preliminary rating of F6 intensity ± 1 scale, before deeming F6 ratings "inconceivable".