User:CapeVerdeWave/Tornado outbreak sequence of May 4–6, 1960

On May 4–6, 1960, a large tornado outbreak sequence affected parts of the Midwestern and Southern United States. The severe weather event produced at least 71 confirmed tornadoes, including five violent tornadoes in the U.S. state of Oklahoma. Major tornado activity began on the afternoon of May 4, with strong tornadoes affecting the Red River Valley and the Dallas-Fort Worth metroplex. Two F4 tornadoes struck parts of southern Oklahoma, causing significant damage to the Konawa and Soper areas. In all, at least 22 tornadoes formed between the early afternoon and late evening hours, with two more tornadoes forming early on May 5, shortly after midnight CDT. A much more significant tornado outbreak began on the afternoon of May 5 and continued overnight, spreading from eastern Oklahoma into portions of southern Missouri and Central Arkansas. At least 35 tornadoes developed between 6:00 a.m. CST on May 5–6, including a long-tracked F5 that struck rural areas in Northeastern Oklahoma and killed five people. Two other F4 tornadoes killed 21 people in and near Sequoyah County in the eastern portion of the state. Other strong tornadoes affected the Little Rock metropolitan area early on May 6 in Arkansas. In all, the tornado outbreak sequence killed 33 people and injured 302.

Confirmed tornadoes
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 NEXRAD Doppler weather radar in 1990–1991. 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. 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.