Storm chasing is broadly defined as the deliberate pursuit of any severe weather phenomenon, regardless of motive, but most commonly for curiosity, adventure, scientific investigation, or for news or media coverage. A person who chases storms is known as a storm chaser or simply a chaser.

This page documents confirmed tornadoes in October, November, and December 2020 via various weather forecast offices of the National Weather Service. Based on the 1991–2010 averaging period, 61 tornadoes occur across the United States throughout October, 58 through November, and 24 through December.

Map of tornado warnings and confirmed tornadoes from the outbreak

A large, deadly and major tornado outbreak occurred across the Central and Southern United States from May 6–10, 2024, as a result of a slow-moving trough that was moving across the country. The Storm Prediction Center (SPC) issued a tornado-driven high risk convective outlook for portions of central Oklahoma and extreme southern Kansas early on May 6. Millions of people were put under a particularly dangerous situation (PDS) tornado watch later that evening, as many tornadoes were reported across the region, particularly in Oklahoma, where a violent EF4 tornado struck the towns of Barnsdall and Bartlesville, Oklahoma. Severe and tornadic weather spread eastward over the Mississippi, Ohio, and Tennessee Valleys over the next two days, with a nocturnal outbreak occurring in the latter on May 8, as tornadic supercell thunderstorms produced many tornadoes across the states of Tennessee, northern Alabama and western Georgia. The system responsible for the outbreak finally moved offshore by May 10 after producing several more tornadoes across the Southeast, including 2 EF2 tornadoes and hurricane-strength straight-line winds that moved through Tallahassee. This large outbreak came less than two weeks after a similarly large and deadly outbreak occurred across most of the same regions.

Three fatalities directly linked to the tornadoes have been confirmed so far, with the majority in Oklahoma; one tornadic death also occurred in Tennessee on May 8. Three non-tornadic deaths related to straight-line winds also occurred. In addition, during the course of the outbreak, tornado emergencies were issued for three consecutive days between May 6–8 for damaging tornadoes; the last time that this phenomenon had occurred was exactly 21 years prior, where tornado emergencies were issued for four consecutive days between May 6–9, 2003, during a similarly large outbreak.

June 5

• 1908 – An outbreak produced multiple violent tornadoes near the Kansas/Nebraska state line, killing 20 people. An F5 tornado killed 12 people as it traveled from near Deshler, Nebraska, across the eastern part of Carleton to near Geneva. Several farms were so completely destroyed that there was little evidence that they had even existed. Five people died in one family.
• 1916 – A tornado outbreak killed at least 99 people across the Central United States, with most of the deaths in Arkansas. An F4 tornado or tornado family killed at least 25 people on a path from near Barney to near Almond, Arkansas, including at least 18 in the devastation of Heber Springs. An F3 tornado destroyed a small community near Judsonia, Arkansas, killing nine people, including five children in one family. Another F3 tornado killed seven people, all in one house, near Sikeston, Missouri.
• 1917 – A tornado outbreak resulted in at least 49 deaths across the Midwestern United States. An F4 tornado killed 20 people in Cooper and Boone Counties, Missouri, including 7 in Centralia. Another F4 tornado killed nine people as it obliterated farms near Topeka, Kansas. An F3 tornado killed nine people as it passed between Norwood and Mountain Grove, Missouri.

June 6

• 1974 – Scattered tornadoes touched down across the Midwestern and Southeastern United States. An F3 tornado damaged or destroyed 300 homes in Forrest City, Arkansas, killing four people and injuring 112.

June 7

• 1947 – An F4 tornado passed south of Vienna, Ohio and through Sharon and Farrell, Pennsylvania, killing six people and injuring 340. About 150 buildings were destroyed, and many people were injured in the collapse of apartment buildings and factories.

• ...that the 2013 Moore tornado that struck Moore and Newcastle, Oklahoma, is the most recent EF5 tornado?
• ...that the 2021 South Moravia tornado, an IF4 tornado with winds between 207–260 mph (333–418 km/h), was the strongest tornado to hit the Czech Republic in modern history?