 In addition to that storm, a supercell on April 10 produced the largest and most damaging hail swath in history; as well as ten tornadoes.The first tornadoes developed during the late afternoon across west-central Missouri and mostly tracked near Interstate 70 eastward towards the St. Louis Metropolitan Area during the first half of the evening before weakening in Illinois.In addition to the damaging hail (see Tri-State hailstorm section for details), several weak tornadoes were confirmed.