From May 19–22, 1957, a tornado outbreak took place across the US Central Plains. A total of 59 tornadoes were reported from Colorado to the Mississippi Valley.[note 1][note 2] The most destructive tornado of the severe weather event—likely part of a long-lived family—was rated at F5, the highest level, and is often called the Ruskin Heights tornado, after the site of its worst damage, a suburb and housing development in southern Kansas City, Missouri. Additionally, a powerful F4 tornado virtually destroyed Fremont, Missouri, claiming seven lives, and an F3 tornado killed eight others in and near Belgrade, Missouri. A pair of F4s—one in Minnesota, the other in Kansas—also neared F5 intensity. In all, 59 people were killed during the outbreak, including 44 in the Ruskin Heights tornado.
The outbreak coincided with elevated tornado activity: the period May 19–26 was one of the most intense to date, since the founding of the United States Weather Bureau. At 00:30 UTC (7:30 p.m. CDT) on May 20, a 75-to-80-knot (86 to 92 mph; 139 to 148 km/h) mid-level jet stream bisected dew points of 65 °F (18 °C), coincident with a 986-millibar (29.1 inHg) low-pressure area and warm front over southeastern Nebraska. Soundings and surface weather observations indicated a robust, unstable warm sector, showing 3,000 j/kg of surface-based convective available potential energy (CAPE) and the presence of strong wind shear. Favoring supercells, this setup led to the then largest one-day total of tornadoes in Weather Bureau history. At 17:00 UTC (12:00 p.m. CDT) the Severe Local Storms Unit (SELS) in Kansas City had already issued a severe weather watch, mentioning tornadoes, for the Kansas–Nebraska state line and its environs. Subsequent updates covered much of the eastern Great Plains, from the Green Country to southeastern Nebraska. Upon formation, severe thunderstorms traveled at up to 42 mph (68 km/h), attended by extremely large hail.[1][3]
Prior to 1990, there is a likely undercount of tornadoes, particularly E/F0–1, with reports of weaker tornadoes becoming more common as population increased. A sharp increase in the annual average E/F0–1 count by approximately 200 tornadoes was noted upon the implementation of NEXRADDoppler weather radar in 1990–1991.[6][note 3] 1974 marked the first year where significant tornado (E/F2+) counts became homogenous with contemporary values, attributed to the consistent implementation of Fujita scale assessments.[10][note 4] Numerous discrepancies on the details of tornadoes in this outbreak exist between sources. The total count of tornadoes and ratings differs from various agencies accordingly. The list below documents information from the most contemporary official sources alongside assessments from tornado historian Thomas P. Grazulis.
May 19 event
Confirmed tornadoes — Sunday, May 19, 1957[note 5]
A brief tornado—the third on record in the Fresno area—tore loose roof shingles, downed an almond tree, and mangled a rooftop air conditioning unit.[20][21]
This tornado blew a farmhouse off its foundation and stripped most of its roof. It destroyed outbuildings on a few farms as well. According to the Climatological Data National Summary, this tornado hit 6+1⁄2 mi (10.5 km) west of Bayard, implying touchdown in Scotts Bluff County.[23][24][21]
Part of a family, this violent tornado struck 12 farms at F4 intensity, at one point approaching F5 status. The main event, it destroyed an entire farm near Haddam, and was accompanied by at least four—possibly up to eight—satellite tornadoes, along with many funnel clouds. The storm that produced the tornado damaged a 50-to-60-mile-long (80 to 97 km) swath.[39][23][40][5]
This tornado hit more than 12 farms, destroying barns, and unroofed homes as well. On a farm it killed upward of 500 turkeys. In all, the tornado struck "15 sets" of structures. Grazulis listed a 30-mile (48 km) path.[49][50][47]
This tornado moved through town, causing roof and other damage—mostly minimal—to roughly 200 homes, one of which lost its roof entirely. The tornado also overturned cars, downed trees, and destroyed outbuildings. Grazulis rated it F2.[49][62][56]
This tornado may have been related to or the same as the Ruskin Heights F5. Grazulis did not rate it F2 or stronger. Further details are unavailable.[41][1][63][56]
Related to the Ruskin Heights F5, this tornado caused "considerable" damage, and strewed debris over a 40-acre (16 ha) field. However, Grazulis did not rate it F2 or stronger.[41][64][65]
Passing near Lone Chapel, this tornado destroyed or damaged 40 outbuildings, a home, and a barn. The tornado caused an injury as well. Grazulis rated it F2.[49][71][72][67]
This violent tornado sheared off 2-foot-thick (0.61 m) trees and produced borderline-F5 damage to a home. It destroyed a total of four homes and eight barns. It injured a few people as well.[39][49][75][74]
8 deaths – This intense tornado destroyed 20% of Belgrade, as well as 24 barns and large, rural homes. It also destroyed structures at a school, in addition to multiple churches. It injured 50 people as well. An F4 tornado also hit Belgrade on March 19, 1948.[81][82][83][84][74]
Perhaps part of a family, this tornado destroyed a grain elevator. It also hit four farms, destroying or damaging barns. Grazulis indicated a path near West Branch.[49][91][86]
This tornado lofted and spun a home 150 ft (46 m), injuring a few occupants. The roof of the home was moved 500 ft (150 m). Grazulis rated the tornado F3.[49][94][86]
May 22 event
Confirmed tornadoes — Wednesday, May 22, 1957[note 5]
This tornado damaged treetops, as well as the roofs of barns and homes. Shortly before dissipation, it wrecked all barns on a farmstead. Grazulis rated it F2.[95][96][97][98]
This violent, long-tracked, multiple-vortex event was likely a family of tornadoes. Forming near Williamsburg, it moved northeastward through several counties, producing near-continuous damage; a single tornado was likely present for 50 mi (80 km) or more. Around Homewood, the tornado was attended by up to 10 tentacle-like vortices or satellite tornadoes, producing major damage to rural property and carrying gravestones miles away. Passing near Ottawa, Rantoul, and Spring Hill, it leveled many homes and caused seven fatalities. It also damaged a drive-in, motel, and truck stop. South of Wellsville, the tornado may have dissipated and reformed; it then continued uninterruptedly for the rest of its life.
Along the Kansas–Missouri border the tornado followed a near-straight line, causing $1 million in losses in Kansas. Affecting the southern suburbs of Kansas City, it entered Missouri, tearing through Martin City, Hickman Mills, and Ruskin Heights, along with the northeastern side of Grandview. Housing incurred F5 damage, besides some businesses at a shopping center. Some areas were reportedly "swept clean", and a newly built brick school in Ruskin Heights was badly damaged. 85% of Martin City was uninhabitable. In all the tornado claimed 37 lives in Missouri and injured 500 or more people. Debris from Hickman Mills was found in Iowa, 165 mi (266 km) away, and other debris was carried aloft 30,000 ft (9,100 m; 5.7 mi; 9.1 km).
Historically, the 1957 F5 was not the only significant tornado to affect the area: an F3 tornado also affected Martin City and nearby Holmes Park on May 23, 1946, destroying or damaging chicken coops, silos, a marketplace, barns, and homes. The tornado killed a couple and injured five people.[104]
A cyclic supercell was likely responsible for this deadly, violent tornado, which probably formed over remote parts of the Mark Twain National Forest. The tornado, possibly a member of a long-lived family, did little or no damage before Fremont. Entering town, the tornado rendered unusable all but seven structures, causing "F5-appearing" damage. Hardest hit were schools, businesses, and homes on the eastern side of Fremont, along and near the railroad; these were poorly built, so the tornado was rated F4, but F5 winds could have occurred. A three-story brick school was nearly leveled, and trees in town were partly debarked. In all, the tornado badly damaged or destroyed 50 homes in Fremont, while causing lesser damage to 31 others. The tornado also severely damaged a dozen other buildings in town, as well as eight small businesses. Past Fremont, the tornado remained intense, damaging structures in Van Buren at "near-F3" intensity. In Van Buren the tornado destroyed 25 homes and severely damaged 35 more. It also badly damaged or destroyed 91 other structures and caused significant damage to three small businesses. In all, it damaged about half of Van Buren. Its path may have been 25 mi (40 km) long. Six of the seven fatalities were at Fremont, where over 25% of the population was killed or injured.[105]
↑An outbreak is generally defined as a group of at least six tornadoes (the number sometimes varies slightly according to local climatology) with no more than a six-hour gap between individual tornadoes. An outbreak sequence, prior to (after) the start of modern records in 1950, is defined as a period of no more than two (one) consecutive days without at least one significant (F2 or stronger) tornado.[2]
↑Historically, the number of tornadoes globally and in the United States was and is likely underrepresented: research by Grazulis on annual tornado activity suggests that, as of 2001, only 53% of yearly U.S. tornadoes were officially recorded. Documentation of tornadoes outside the United States was historically less exhaustive, owing to the lack of monitors in many nations and, in some cases, to internal political controls on public information.[7] Most countries only recorded tornadoes that produced severe damage or loss of life.[8] Significant low biases in U.S. tornado counts likely occurred through the early 1990s, when advanced NEXRAD was first installed and the National Weather Service began comprehensively verifying tornado occurrences.[9]
↑ 4.04.14.24.34.4The Fujita scale was devised under the aegis of scientist T. Theodore Fujita in the early 1970s. Prior to the advent of the scale in 1971, tornadoes in the United States were officially unrated.[11][12] Tornado ratings were retroactively applied to events prior to the formal adoption of the F-scale by the National Weather Service.[13] While the Fujita scale has been superseded by the Enhanced Fujita scale in the U.S. since February 1, 2007,[14] Canada used the old scale until April 1, 2013;[15] nations elsewhere, like the United Kingdom, apply other classifications such as the TORRO scale.[16]
↑ 6.06.16.26.3All starting coordinates are based on the NCEI database and may not reflect contemporary analyses
↑ 7.07.17.27.3The listed width values are primarily the average/mean width of the tornadoes, with those having known maximum widths denoted by ♯. From 1952 to 1994, reports largely list mean width whereas contemporary years list maximum width.[17] Values provided by Grazulis are the average width, with estimates being rounded down (i.e. 0.5 mi (0.80 km) is rounded down from 880 yards to 800 yards.[18][19]
↑Edwards, Roger (March 5, 2015). "Enhanced F Scale for Tornado Damage". The Online Tornado FAQ (by Roger Edwards, SPC). Storm Prediction Center. Retrieved February 25, 2016.
"Ruskin Heights Tornado Memorial". Ruskin Heights Tornado. Ruskin Heights, Missouri: Ruskin Heights Memorial Tree Arbor Foundation. 11 June 2007. Archived from the original on 29 September 2007. Retrieved 4 September 2024.
— (July 1993). Significant Tornadoes 1680–1991: A Chronology and Analysis of Events. St. Johnsbury, Vermont: The Tornado Project of Environmental Films. ISBN1-879362-03-1.