1920 Palm Sunday tornado outbreak
Date(s) | March 28, 1920 |
---|---|
Duration | ~9 hours |
Confirmed tornadoes | ≥ 37 |
Maximum rated tornado | F4 (Fujita scale) |
Damages | Unknown |
Casualties | 380+ |
The Palm Sunday tornado outbreak of 1920 was an outbreak of at least 37 tornadoes, 31 of which were significant, across the Midwest and Deep South states on March 28, 1920. The tornadoes left more than 380 dead and at least 1,215 injured. Many communities and farmers alike were caught off-guard as the storms moved to the northeast at speeds that reached over 60 miles per hour (97 km/h). Most of the fatalities occurred in Georgia (201+), Indiana (56), and Ohio (55), while the other states had lesser totals. Little is known about many of the specific tornadoes that occurred, and the list below is only partial.
Severe thunderstorms began developing in Missouri during the early morning hours. The storms moved quickly to the northeast towards Chicago, Illinois. The first tornado injured five people 35 miles (56 km) southeast of Springfield, Missouri, in Douglas County. This first tornado was a harbinger of things to come as the morning went on and the atmosphere began to destabilize, due to the abundance of sunshine that preceded the cold front in the warm sector, which covered the lower Great Lakes region extending southward well past the Ohio River Valley.
Meteorological synopsis
According to meteorologist and weather historian Charles Merlin Umpenhour, climatic conditions were favorable on Palm Sunday 1920 for all the atmospheric ingredients to come together needed to create the classic setup needed for long-track tornadoes. However, forecasting, communications technology, and public awareness about Severe Weather was nearly nonexistent in 1920 and would not begin for another 33 years, when the U.S. Weather Bureau would implement its public Watch (the word ‘forecast’ was used until 1966) and Warning program in 1953.
For the residents of the Great Lakes region and Ohio Valley areas, the only source of weather information was the rather vague forecasts that were issued in the local newspaper the day before or by word of mouth. The use of the word "tornado" was strictly prohibited in public weather forecasting until the 1950s because of the fear and panic it might cause. This policy would come under-fire in the years to come especially after the Tri-State Tornado in 1925 that stands today as the deadliest tornado in American history.
Weather forecasters and the public alike in the Chicago, Dayton, Fort Wayne, Lansing, South Bend, and Toledo areas were unaware that the stage was set that day for a significant tornado outbreak that would follow a balmy and seemingly tranquil Palm Sunday afternoon. The weather maps in use in March 1920 showed a rather large and deep cyclone over northern Iowa that was forecast to move across central Lower Michigan by nightfall with a trailing cold front. Meteorologists knew rain showers and perhaps a thundershower was a good possibility, but were unaware that the helicity, lifted index, and upper level winds were being guided by a strong jet stream with a probable negative-tilt that would create favorable conditions for the development of tornadoes.
Confirmed tornadoes
Confirmed Total |
Confirmed F? |
Confirmed F0 |
Confirmed F1 |
Confirmed F2 |
Confirmed F3 |
Confirmed F4 |
Confirmed F5 |
≥ 37 | 5 | ? | ? | 15 | 8 | 8 | 0 |
March 28 event
List of confirmed tornadoes - May 4, 1960 | ||||||
---|---|---|---|---|---|---|
| | | | | ||
Missouri | ||||||
F2 | Near Vanzant | Douglas | 0830 | unknown | The first known strong tornado of the outbreak destroyed frail farmhouses in rural areas. Minimal losses were reported.[1] | |
Michigan | ||||||
F2 | SE of Lansing | Ingham | unknown | unknown | A home was reported destroyed near Mason.[1] | |
F2 | S of Free Soil | Mason | unknown | 7 miles (11 km) | An F2 tornado destroyed a barn and unroofed one home as it briefly touched down.[1] | |
F2 | SE of Baroda to E of Sodus | Berrien | 1730 | 10 miles (16 km) | Another F2 tornado destroyed barns on five separate farms and also tore apart one home.[1] | |
F2 | W of Hart to Weare | Oceana | 2000 | 10 miles (16 km) | 1 death — A tornado began as a waterspout over Lake Michigan. As it moved onshore, it killed a man and destroyed a barn and a small home. May have continued many more miles into Lake and Osceola Counties.[2] | |
F2 | W of Three Rivers to S of Climax | St. Joseph, Kalamazoo | 2100 | 30 miles (48 km) | Likely a tornado family, this event destroyed barns and killed cattle as it skipped along.[2] | |
F2 | SW of Kalamazoo | Kalamazoo | 2100 | unknown | A tornado destroyed barns near Kalamazoo before dissipating and reforming in Barry County as an F4 tornado.[2] | |
F3 | S of Mulliken to St. Johns | Eaton, Clinton, Gratiot, Saginaw | 2130 | 50 miles (80 km) | 1 death — At about 4:30 p.m. CST, a major tornado family touched down south of Mulliken in Eaton County, Michigan. It first destroyed farm buildings north of Wacousta and later continued to do so as it passed east of Mulliken and northeast of Eureka.[2] It then caused possible F4 damage to farms southwest of St. Johns and produced F2 damage in the business district of that town. In downtown St. Johns, the tornado smashed glass windows, tore off roofs, and destroyed walls, causing $250,000 in damage.[3] The tornado was 300 yards (900 ft) wide as it passed through St. Johns. | |
F4 | S of Hickory Corners to near Vermontville | Barry, Eaton | 2130 | 20 miles (32 km) | 4 deaths — A violent tornado destroyed 35 farms in its path and killed people in farmhouses in the vicinity of Maple Grove. It also carried part of a furnace 12 miles (19 km).[2] | |
F3 | S of Orangeville to ENE of Hastings | Barry | 2130 | 15 miles (24 km) | 1 death — A tornado immediately destroyed a home as it touched down. Later, it went on to destroy nearly 15 farms. It was a very intense event, possibly an F4 tornado, and may have begun at Alamo in Kalamazoo County.[2] | |
F2 | S of Perry to NE of Morrice | Shiawassee | 2300 | 7 miles (11 km) | A tornado destroyed barns and killed farm animals along its short-lived path.[2] | |
F2 | W of Saginaw | Saginaw | 0007 | 2 miles (3.2 km) | A tornado struck four farms in western Saginaw and destroyed barns.[2] | |
F4 | NNE of Fenton | Genesee, Oakland | ~0030 | 10 miles (16 km) | 4 deaths — See section on this tornado | |
Illinois | ||||||
F2 | S of Cortland to NE of Sycamore | DeKalb | 1800 | 12 miles (19 km) | A tornado destroyed many silos and barns along its path.[1] | |
F3 | SE of La Fox to Elgin | Kane | 1805 | 20 miles (32 km) | 8 deaths — See section on this tornado | |
F4 | N of Channahon to Wilmette | Will, Cook | 1815 | 53 miles (85 km) | 20 deaths — See section on this tornado — This devastating tornado exited over Lake Michigan.[1] | |
F2 | Bridgeview to WSW of the Chicago Loop | Cook | 1910 | 10 miles (16 km) | A tornado struck between Cicero and Chicago Midway Airport. It destroyed eight buildings, including a school, and unroofed many others.[1] | |
F? | W of Cornland to N of Lincoln | Logan | 2200 | 20 miles (32 km) | A tornado passed through the Broadwell area. It damaged farmhouses and buildings and caused significant damage to trees and power lines.[3] | |
F? | NE of Elgin | Kane | unknown | unknown | A tornado, part of the Elgin tornado family, destroyed two barns and killed 38 cattle.[3] | |
F? | W of Barrington | Lake | unknown | unknown | Another tornado, also part of the Elgin tornado family, substantially damaged farm buildings.[3] | |
F? | Wauconda | Lake | unknown | unknown | A funnel was observed with many cattle killed and buildings destroyed. This was also part of the Elgin tornado family.[3] | |
Wisconsin | ||||||
F2 | E of Elkhorn to W of East Troy | Walworth | 1815 | 6 miles (9.7 km) | 1 death — A tornado destroyed three barns, killing one woman.[1] | |
Georgia | ||||||
F2 | N of Milner | Pike | 1900 | 2 miles (3.2 km) | 1 death — A tornado killed a woman as it destroyed a home and a church.[1] | |
F3 | SE of LaGrange | Troup | 2245 | 5 miles (8.0 km) | 27 deaths — At 5:45 p.m. EST, a powerful tornado struck the southeast section of LaGrange in Troup County, Georgia. As it passed through the area, it destroyed 75 poorly constructed homes near a mill and a factory. The tornado damaged railroad cars and spilled and ruined much fertilizer in the area, then went on to destroy both the mill and the factory. There, the tornado was up to 800 yards (0.45 mi) wide and may have reached F4 intensity, though only F3 damage could be confirmed.[2] Causing 27 deaths in Troup County, all in LaGrange alone[2]—though some accounts suggested up to 200 "dead and injured" across Troup County[4]—it became the deadliest tornado of the entire outbreak this day. | |
Alabama | ||||||
F3 | W of Jacksonville | Calhoun | 2000 | 8 miles (13 km) | 1 death — A tornado tore apart a small home, killing a boy near Cedar Springs. It also caused damage to barns and trees southwest of that community.[1] | |
F2 | N of Deatsville | Elmore | 2030 | unknown | A tornado destroyed barns and small homes.[2] This was continuous with the next tornado, listed below.[5] | |
F4 | NE of Eclectic to West Point, GA | Elmore, Tallapoosa, Chambers, Troup (GA) | 2045 | 50 miles (80 km) | 26 deaths — This tornado first developed east of Eclectic between 3:00–3:45 p.m. CST,[5] but most likely around 2:45 p.m. CST according to Thomas P. Grazulis.[2] Some damage occurred to homes, trees, outhouses, and a school[5] before the tornado hit Red Hill.[2] Next, the tornado caused at least 17 deaths and destroyed 60 homes in Alabama, mainly near Agricola, Susanna, and Red Ridge. Afterward, it caused nine deaths and 40 injuries in an industrial and business swath of West Point, Georgia, with 40 homes destroyed in Georgia.[2] It became the second-deadliest tornado to hit this day. | |
Indiana | ||||||
F3 | S of Mishawaka to NW of Union, MI | St. Joseph, Elkhart, Cass (MI) | 2015 | 22 miles (35 km) | A tornado caused damage to twelve farms and destroyed a home northwest of Elkhart, Indiana. It then destroyed four more farm buildings in Michigan.[2] | |
F3 | W of Leroy to W of Valparaiso | Lake, Porter | 2100 | 7 miles (11 km) | 1 death — An F3 tornado destroyed two homes and damaged five, killing a man in his home. This event ended near Beatrice in what is now Porter Township.[2] | |
F4 | NE of Orland to SW of Coldwater, MI | Steuben, Branch (MI) | 2130 | 13 miles (21 km) | 2 deaths — At 4:30 p.m., the first of at least three F4 tornadoes to hit Michigan began in northern Indiana, northeast of Orland in Steuben County. Prior to the tornado, damaging winds caused minor damage to businesses and homes in Orland.[2] Later, the tornado strengthened as it crossed into Branch County, Michigan. Upon entering Michigan, it produced F4 damage to a farmhouse and killed two people near East Gilead, Michigan.[2] The tornado later dissipated southwest of Coldwater. Another deadly F4 tornado also passed near East Gilead on Palm Sunday of April 11, 1965. | |
F4 | Near Uniondale to SW of Sylvania, OH | Wells, Allen, Paulding (OH), Defiance (OH), Henry (OH), Fulton (OH), Lucas (OH) | 2215 | 100 miles (160 km) | 23 deaths — See section on this tornado — This powerful tornado family passed south of Ossian and devastated the village of Townley, near the Indiana–Ohio border.[2] | |
F4 | SW of West Liberty to S of Van Wert, OH | Jay, Adams, Mercer (OH), Van Wert (OH) | 2300 | 40 miles (64 km) | 17 deaths — While the previous F4 tornado dissipated just after reaching the Michigan state line, another tornado developed further south in Indiana and crossed into Mercer and Van Wert Counties, Ohio. Upon touching down in Indiana, the tornado severely impacted West Liberty, Indiana (seven deaths), located north-northwest of Portland, before leveling homes between Geneva and Ceylon.[2] In this area, the tornado partially stripped chickens of their feathers[3]—a common phenomenon known as moulting[2]—and many buildings were swept away with their floors slightly dislodged.[3] Thereafter, it leveled farms and killed three people in neighboring Ohio. In this area, the tornado was very intense and may have even reached F5 intensity,[2] being one of the strongest tornadoes recorded this day. After exiting Adams County, Indiana, this large tornado moved towards the far northwestern part of Mercer County in west-central Ohio, again destroying nearly everything in its path. As the tornado moved on into Van Wert County, three more people died and many would be injured as the storm moved to the south of Van Wert.[6] Some of this same area was hit by another F4 tornado on November 10, 2002. | |
F3 | S of Union City to SW of New Weston, OH | Randolph, Darke (OH) | 0030 | 15 miles (24 km) | 5 deaths — A tornado destroyed six farms in Ohio, near Lightsville.[7] | |
F4 | W of Fountain City to N of Greenville, OH | Wayne, Randolph, Darke (OH) | 0100 | 20 miles (32 km) | 8 deaths — The final violent tornado of the outbreak destroyed eight homes near Fountain City before causing F4 damage to farms in Ohio. Its worst effects were observed 2 miles (3.2 km) northwest of Greenville.[7] | |
Ohio | ||||||
F? | Grand Lake St. Marys to SW of Lima | Mercer, Auglaize, Allen | 0030 | unknown | See section on this tornado | |
F2 | E of Bowling Green to NE of Martin | Wood, Sandusky, Ottawa | 0030 | > 7 miles (11 km) | 2 deaths — See section on this tornado — A tornado passed through Genoa, destroying numerous businesses and 20 homes. Fires engulfed some of the homes and two people died.[2] | |
Sources: Grazulis 1993, Monthly Weather Review |
Notable tornadoes
La Fox/Elgin, Illinois
Just before the noon hour, severe thunderstorms began forming 50 miles (80 km) west of downtown Chicago. The first storm started to spawn killer tornadoes in DeKalb and then Kane Counties starting at 12:00 p.m. CST. Upon touching down, the tornadoes then moved northeast at about 50 miles per hour (80 km/h).[3] The tornado in Kane County apparently first formed about 1.5 miles (2.4 km) southeast of La Fox and moved northeast, later passing directly through downtown Elgin.[3] Initially, the tornado destroyed a farmhouse and numerous barns, killing a father and tossing about a baby[3] as it touched down.[1]
Observers occasionally reported a well-defined funnel along the path as the tornado continued into the business district of Elgin, destroying or damaging many structures. It destroyed six businesses, damaged many others, and also "partially wrecked" three churches.[3] Three people died as the rear of a theater collapsed, three more as a brick church tower fell, and one additional as a building façade caved in. Church services had been dismissed just minutes before, saving the lives of parishioners and preventing more deaths in Elgin.[3]
As the tornado left downtown Elgin, it destroyed numerous trees along with 25 homes and damaged 200 other residences. Thereafter, the tornado probably dissipated,[1] only to develop into a new tornado. Both isolated tornado and widespread non-tornadic downburst damage was reported as far as Wauconda, killing cattle, damaging farms, and destroying many buildings.[3] The tornado in Elgin was rated F3 in a study and was the first tornado of the outbreak to cause deaths and to kill more than five people.[1]
Melrose Park, Illinois
The Melrose Park-Wilmette tornado originated about 12.15 p. m. in Will County, 1.5 miles (2.4 km) north of the village of Channahon and 8 miles (13 km) southwest of Joliet. The funnel-shaped tornado cloud was first seen and damage was first noted at the farm of John Dison...
Roughly 15 minutes after the Elgin tornado formed, a violent F4 tornado tore through Will and Cook Counties, producing a path 53 miles (85 km) long in the Bellwood and Maywood areas. The tornado first destroyed five homes,[1] two frame schools, and at least 12 barns[3] as it passed from Channahon to Troy and then Lockport. It skipped thereafter, possibly dissipating and redeveloping into a second tornado, as it caused minor damage in the Romeoville area. Afterward, the tornado funnel was not seen for some time.[3]
Upon reaching the Bellwood-Maywood area, a second tornado probably touched down and produced a continuous damage swath to Lake Michigan, killing 20 people and leveling many homes with F4 damage.[1] 10 of the deaths alone occurred at Melrose Park[1] when the tornado hit the Melrose Park Catholic Church and Convent[3] where people were getting ready for Palm Sunday services. The tornado destroyed 50 other buildings in Melrose Park before moving over less-populated areas, killing six more people in the community of Dunning before passing over Lake Michigan. In all, the tornado partially or completed destroyed 413 buildings and injured about 300 people. It is just one of just six known F4-F5 tornadoes to occur within the Chicago metropolitan area.[1][8]
Townley, Indiana/Swanton–Brunersburg–Raab Corners, Ohio
The tornadoes that struck the western counties of Darke, Defiance, Mercer, Paulding, and Van Wert in Ohio on March 28, 1920, originated in the Hoosier State, quickly moving across the state line into Ohio.
The first of the tornadoes began in Indiana around 5:15 p.m. CST. Probably part of a tornado family, it touched down near the Wells County community of Ossian. Increasing rapidly in size and intensity, the tornado was reported by eyewitnesses to have resembled a very large, low-hanging mass of turbulent clouds that resembled boiling pot of oatmeal.[6] This may have accounted for the deaths and injuries of so many farmers within its path, since many farmers were usually accustomed to taking shelter during dangerous weather situations.[3] The tornado then hit Edgerton[3] and destroyed farms in Indiana and caused nine deaths before destroying nearly every building at Townley.[2] Four people died there as the entire town was devastated[3] with F4 damage. The powerful F4 tornado leveled at least 100 buildings in Indiana[2] with 13 deaths and $1,000,000 in damage (1920 USD) in the state.[3] It later became the first of three tornadoes to move into Ohio, this time from Allen County, Indiana.
After moving through Paulding County, the tornado alternately lifted and dipped to the ground,[2] possibly even reforming as a separate tornado, as it moved into the Defiance area. Here several homes and a small store were destroyed and six people lost their lives. The violent tornado then moved northeast into Henry and Fulton Counties, tearing through the town of Swanton, located near Brunersburg,[2] and causing major damage.[6] Many factories, shops, and homes were completely demolished. According to the Toledo Blade newspaper, the central business district sustained very heavy damage along Main Street, extending into nearby residential areas, where the damage became more intense. This damage brought out many thieves who looted local businesses and houses that had been hit by the tornado.[6] Continuing on, the tornado then caused isolated damage to farms and trees as it passed into rural areas.[2]
Increasing in size as it moved into northwest Lucas County, the tornado produced increasingly severe damage, as buildings and homes were swept clean of their foundations,[6] before leveling the entire community of Raab Corners (four deaths), also called "Rab's Corners", in Lucas County.[2] Farmhouses and other buildings were leveled as the violent tornado, .5 miles (1 km) wide at this point, moved towards Raab Corners. The residents of Raab Corners were largely unaware of the impending danger as they celebrated Palm Sunday services at the Immaculate Conception and St. Mary's Churches that evening.[6] Just after 7:00 p.m. CST rain and small hail started to come down in torrents. As the power went out churchgoers lighted kerosene lamps to illuminate the interior of their buildings, and to continue their Palm Sunday services, when the winds began to increase followed by large hail that shattered all the windows. Around 7:15 p.m. CST, a solid black wall of swirling clouds proceeded to engulf Raab Corners, destroying everything in its path and killing four[2] people. Local residents decided not to rebuild the town, moving to nearby communities in Michigan and Ohio.[6] Today, only an intersection remains at once was the main four corners.
Fenton, Michigan
The third and final F4 tornado in Michigan this day touched down west-northwest of Fenton at about 7:30 p.m. CST, shortly before "8 o' clock,"[9] though one estimate suggested a time of 5:00 p.m. CST.[2] The tornado first destroyed a barn, a farmhouse, and a school[10] as it moved northeast.[2] It then struck a cement plant and demolished a smokestack and destroyed the steel-framed kiln room, reportedly warping and twisting the steel bars "so badly...that it is probable that the enclosure will have to be rebuilt." Total losses reached $100,000 at the plant.[9] Afterward, the intensifying tornado leveled farm buildings and killed two horses and several other livestock; it left cows unharmed but pinned under debris.[10] The F4 tornado then struck and completely leveled about 30 lakeside summer homes,[9] many of them large and well-built structures[10] worth $3,000–$6,000 to build at the time.[9] Intense winds lifted boats up to 300 feet (91 m) from their moorings and carried entire homes several hundred feet from their foundations.[9] In the summer, according to the Fenton Independent, there would have been "hundreds of people camping at the lake. Should the accident have occurred at that time there would have been hundreds of deaths."[9] In all, the powerful tornado killed four people and damaged or destroyed 35 buildings near Fenton. One of the deaths occurred in an overturned car, among the earliest tornado-related deaths in an automobile; the earliest known such death was probably on May 19, 1918, in Iowa.[2]
Other tornadoes
Around 7:30 pm, another tornado developed in eastern Mercer County first appearing as a waterspout over Grand Lake St. Marys. This storm quickly intensified as it moved towards the northeast at 55 miles per hour (89 km/h). The heaviest damage occurred near Moulton, located in Auglaize County, as several farms and homes were destroyed, with only minor injuries reported. This tornado continued on into Allen County, but lifted before striking the city of Lima.[6] Meanwhile, to the north in Wood County, another tornado (some reports say there were two at the same time) touched down east of Bowling Green, Ohio, and moved rapidly northeast into Sandusky County, taking everything in its path with it. Moving into the Ottawa County village of Genoa, the tornado leveled over 36 (some sources say 20[2]) homes and several businesses. In the Clay Township area, two people were killed and 20 people were injured, extending to the small town of Trowbridge. The tornado passed out into Lake Erie before causing any further damage.[6]
Oddities/records
Newspaper accounts and weather records document over 31 storms of major significance; thus, the probable number of actual tornadoes is higher. The only time prior to 1950 where weather forecasters would conduct an official inquiry is when a single tornado was noteworthy of an extensive investigation such as the infamous Tri-State Tornado of March 18, 1925. According to Thomas P. Grazulis, head of the Tornado Project, the death tolls in the southern states on Palm Sunday 1920 could have easily been much higher since the deaths of non-whites from natural disasters were often overlooked or omitted in either official or newspaper records.
See also
- List of North American tornadoes and tornado outbreaks
- Palm Sunday tornado outbreak of 1965
- Palm Sunday tornado outbreak of 1994
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 1.11 1.12 1.13 1.14 1.15 1.16 Grazulis, Significant, p. 767
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 2.12 2.13 2.14 2.15 2.16 2.17 2.18 2.19 2.20 2.21 2.22 2.23 2.24 2.25 2.26 2.27 2.28 2.29 2.30 2.31 2.32 2.33 Grazulis, Significant, p. 768
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 3.20 Mitchell, Charles L. (April 1920). "Tornadoes of March 28, in Northeastern Illinois" (PDF). Monthly Weather Review (Chicago, Illinois: United States Weather Bureau) 28 (4): 191–196. doi:10.1175/1520-0493(1920)48<191b:TOMINI>2.0.CO;2.
- ↑ "Selected Timeline of Troup County History". Troup County Historical Society. Archived from the original on 13 October 2003. Retrieved 5 February 2013.
- ↑ 5.0 5.1 5.2 Smyth, P. H. (April 1920). "The Tornadoes of March 28, 1920, in East-Central Alabama" (PDF). Monthly Weather Review (Montgomery, Alabama: United States Weather Bureau) 48 (4): 200–203. doi:10.1175/1520-0493(1920)48<200:TTOMIE>2.0.CO;2.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 "Northwest Ohio Is Swept By Tornado; 19 Known Dead". Toledo Blade. Press Pool. March 30, 1920.
- ↑ 7.0 7.1 Grazulis, Significant, p. 769
- ↑ Tornado History Project. "Tornado Map". Retrieved 2013-02-02.
- ↑ 9.0 9.1 9.2 9.3 9.4 9.5 "Death And Destruction In Wake Of Tornado". Fenton Independent. April 1, 1920.
- ↑ 10.0 10.1 10.2 "Four Killed in Cyclone". Fenton Courier. April 1, 1920.
- Press Pool. "Reconstruction Starts In Storm Area Where 22 Died." Toledo Blade. March 31, 1920. Retrieved on April 17, 2001.
- National Oceanic and Atmospheric Administration, National Climatic Data Center / Storm Prediction Center.
Bibliography
- Grazulis, Thomas P. (1993). Significant Tornadoes 1680-1991: A Chronology and Analysis of Events. Environmental Films. ISBN 1-879362-03-1.
- — (2003). The Tornado: Nature’s Ultimate Windstorm. University of Oklahoma Press. ISBN 978-0-8061-3538-0.
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