On March 28, 1920, a large outbreak of at least 37 tornadoes, 31 of which were significant, took place across the Midwestern and Southern United States. The tornadoes left at least 153 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 . Most of the fatalities occurred in Georgia (37), Ohio (28), and Indiana (21), 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 southeast of Springfield, Missouri, in Douglas County.
Background
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.
On the morning of March 28, a deep low-pressure center positioned itself near Sioux City, Iowa, with a reported pressure of . Ahead of the low, temperatures over a broad expanse ranged from above average, indicating a robust warm sector. Around noon CST (18:00 UTC), temperatures ranged from in Chicago, Illinois, to in Montgomery, Alabama, with brisk low-level winds ranging from the southeast to south-southeast. These winds allowed a warm, moist air mass to advect northward from the Gulf of Mexico to the Great Lakes. A strong elevated mixed layer (EML) was present over portions of the warm sector. Meanwhile, a pronounced, eastward-shifting convergence zone, characterised by shifting low-level winds, helped promote the development of vigorous thunderstorms. Observations from Springfield, Illinois, and other weather stations, taken in the wake of the convergence zone, indicated anomalously low relative humidity, suggestive of a strong dry line.
Confirmed tornadoes
La Fox–Elgin, Illinois
Just before the noon hour, severe thunderstorms began forming west of downtown Chicago. The first storm started to spawn killer tornadoes in DeKalb and then Kane counties, starting at 1:05 p.m. CDT. Upon touching down, the tornadoes then moved northeast at about . The tornado in Kane County apparently first formed about southeast of La Fox and moved northeast, later passing directly through downtown Elgin. Initially, the tornado destroyed a farmhouse and numerous barns, killing a father and tossing about a baby as it touched down.
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. 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.
As the tornado left downtown Elgin, it destroyed numerous trees along with 25 homes and damaged 200 other residences. Thereafter, the tornado destroyed two more barns and killed 38 cattle. It then probably dissipated, only to develop into a new tornado. Both isolated tornado and widespread downburst damage was reported as far as Wauconda, killing cattle, damaging farms, and destroying many buildings. 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.
Channahon–Troy Township–Lockport–Bellwood–Maywood–Melrose Park–Dunning, Illinois
Roughly 15 minutes after the Elgin tornado formed, a violent F4 tornado tore through Will and Cook Counties, producing a path long in the Bellwood and Maywood areas. The tornado first destroyed five homes, two frame schools, and at least 12 barns as it passed from Channahon to Troy and thence to 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.