More severe weather developed across the Midwest and southern Great Plains on April 19. Thunderstorms began in the late afternoon and early evening. They brought large hail and several tornadoes. A large tornado was reported near Octavia, Oklahoma. The supercells then merged into a very large squall line. Overnight, the squall line moved eastward and caused major wind damage. It formed several tornadoes across several states. A few were as strong as EF2, but most were brief and weak. In the early hours of April 20, a tornado moved through Oregon, Ohio. It caused some damage but nobody was injured. Three tornadoes hit New Albany, Indiana and Jeffersonville, Indiana. On April 22, several more tornadoes caused damage across the area. The strongest was rated EF4 and struck St. Louis. It caused extensive damage to the city. A few more tornadoes were reported on April 23–24, but most did not cause any severe damage.