Clayton–St. Louis, Missouri/Granite City–Glen Carbon, Illinois This large, fast-moving, and deadly tornado caused significant damage to portions of the
Greater St. Louis area. The tornado first touched down at 2:39 pm CDT in
Clayton just east of
I-170 in
St. Louis County, Missouri. Upon touching down, the tornado immediately reached EF2 intensity as it moved eastward-southeastward through Clayton, damaging apartment buildings, homes, and low-rise buildings, uprooting trees, and snapping tree branches. Turning east-northeastward, it then caused widespread EF1 damage to trees, power poles, and residences at
Fontbonne University; one area of EF2 damage was noted with some power poles that were snapped. The tornado then entered the
City of St. Louis, where the tornado sirens failed to sound before the tornado hit as the emergency manager who was supposed to sound them was at training session and away from her office while the back-up button at the fire department was broken and they only received one directive to sound them, but it was garbled and ambiguous. The tornado continued to produce widespread tree damage as it moved into the city with the
St. Louis Zoo also sustaining damage from the storm's rear flank downdraft. The tornado then began to intensify quickly and reached EF2 intensity after crossing Forest Park Parkway. It heavily damaged multiple apartment buildings, damaged homes, shattered windows, and snapped and uprooted numerous trees. In the
Central West End and
Academy neighborhoods, more homes, churches, mid-rise buildings, traffic lights, power poles, and trees were heavily damaged. Northeast of there, the strengthening tornado blew out the walls and windows and partially and completely removed the roofs of several businesses and brick townhouses, and caused widespread damage to trees, power poles, and traffic lights. Other churches had windows shattered and exterior damage as well. Two areas of low-end EF3 damage occurred on the northwest side of the tornado's path, with a strip mall being partially destroyed and a brick townhouse being flattened; the neighboring brick townhouse was damaged at EF2 intensity. The mayor of St. Louis confirmed that five people were killed and the tornado caused $1.6 billion in damage; one of the deaths was later determined to have been caused by wind damage and not the tornado itself, leaving the death toll from the tornado at four.
Ameren reported more than 100,000 customers without power in the city. Additionally, 38 people were injured by the tornado.
Linton–Switz City–Worthington, Indiana A supercell rode along the warm front in west-central Indiana, before dropping this powerful and deadly tornado in western
Greene County, west-northwest of
Linton at 6:44 p.m. EDT. The tornado initially caused EF0 damage to a barn right after touch down, but quickly began to intensify. After causing EF1 damage around into its journey, the tornado intensified and caused EF2 damage to an outbuilding along
SR 54/
SR 59, completely destroying the structure. The tornado continued tracking in an east-northeastern manner, weakening to EF1 intensity as it obliterated a barn and rolled a camper, before destroying it. Shortly after, the tornado regained EF2 intensity and caused considerable damage to another barn one home just north of Linton. The tornado would then leave Linton and become cloaked in copious amounts of dust as it traversed through farm fields, impacting many homes and farmsteads at EF2 intensity. One home in particular in this area on 295 North suffered high-end EF2 damage, with the southern side of the residence completely collapsed, while a barn on the property was destroyed as well. The strong tornado continued plowing through farmland, before impacting a farmstead on County Road 900 West where a manufactured home, and its debris were blown away from its concrete mounds. Occasional EF2 damage to trees and farm outbuildings as the tornado passed far north of
Switz City and crossed
SR 67 and
US 231/
SR 57. As the tornado passed south of
Worthington, it began to cause more significant damage to properties, though at one farmstead along County Road 325 North, the tornado caused exceptional amounts of damage. Here, a home suffered several exterior wall collapses, with complete destruction of the garage. Many trees were stubbed and denuded, debris was strewn across some distances and fields were partially scoured. Another nearby, and anchored residence was completely destroyed and wiped off its foundation along 325 North. The tornado would continue to the east, producing its last area of EF2 damage to a large pole barn on County Road 200 West before dissipating at 7:06 p.m. EDT. This tornado killed one person, and injured three others as it remained on the ground for 22 minutes. It tracked for , and was wide across portions within Greene County. The parent supercell that produced this tornado persisted onwards as it continued east, dropping an EF1 tornado west of
Solsberry before a significant, and long-tracked EF2 tornado moved through the southern side of
Bloomington, Indiana.
Wolf Creek–Hudgens–Marion, Illinois The storm that produced this violent, fast-moving tornado was first tornado-warned at 5:09p.m. CDT by the
National Weather Service St. Louis, Missouri while it was over
Sainte Genevieve County, Missouri; another tornado warning was issued two minutes for parts of
Perry County, Missouri by the
National Weather Service Paducah, Kentucky as it crossed over into its CWA. The initial circulation then dissipated and a new one formed further to the south and progressed eastward, crossing the state line into
Illinois. Following the issuance of a fifth tornado warning for the cell at 6:08p.m. CDT, the tornado touched down along Grassy Road at 6:15p.m. CDT northwest of Wolf Creek in
Williamson County, initially causing mostly EF0 tree damage as it moved due east. Nearing
IL 148, the tornado intensified to EF1 strength, destroying an outbuilding and heavily damaging a mobile home as it crossed the highway. At this point, the tornado warning for the storm was upgraded to a
particularly dangerous situation tornado warning because radar had confirmed the presence of debris being lofted by the tornado. South of
Marion, the tornado abruptly intensified again and became violent, reaching its peak intensity on Kyler Court, sweeping a two-story house off its elevated floor system and debarking and stubbing hundreds of trees behind the home. This home had a crawlspace foundation, where the home sat on top an elevated floor system. Sill plates were anchored to the concrete foundation by bolts, and the floor joists were toe-nailed to the sill plates. The failure occurred at the weak connection between the floor joists and wall bottom plate, where straight nails were used. These connections are deemed to be well-constructed, but just slightly below the 'expected' threshold of for degree of damage 10. The damage to the home, along with the extreme tree damage nearby led to a high-end EF4 rating with winds of being assigned to this home. Another home nearby was almost completely leveled, other homes had roofs removed and exterior walls knocked down, and an outbuilding was destroyed, with numerous trees also falling on the debris from the structure. The tornado then weakened somewhat but remained intense as it crossed Wards Mill Road at mid-range EF3 intensity. Two homes were leveled, with an injury occurring in the second one, other homes had roofs removed and exterior walls knocked down, outbuildings were demolished, four wooden power poles were snapped, and trees were shredded. The tornado then weakened further, but remained strong, continuing eastward at EF2 intensity through more rural and wooden areas. Most of the damage along this portion of the path was trees being snapped, although it also destroyed an outbuilding, heavily damaged a home, and snapped power poles as well. The tornado reintensified to high-end EF3 strength again as it crossed
IL 166, sweeping away an unanchored home, leveling a nailed-down home, and removing the roof and knocking down some exterior walls of a third home. The storm would remain tornado warned for four more hours as it continued eastward, producing three additional tornadoes before weakening below severe limits over northwestern
Hardin County, Kentucky. County officials instituted an overnight
curfew for unsafe travel conditions. Volunteer centers, including two Red Cross shelters, opened in Marion the following day.
Whittle–Somerset–Mount Victory–London, Kentucky This large, long-tracked, and devastating tornado first touched down in
Russell County northeast of
Jamestown at 10:26 p.m.EDT. At the touchdown point, the tornado damaged the roof of an outbuilding as it started eastward and crossed
KY 619. The tornado then shattered windows and inflicted roof and siding damage to a home before crossing Caney Creek, uprooting trees on the hillsides on both sides of the creek. The tornado then turned east-northeastward, rolling and destroying a mobile home before crossing McFarland Creek and moving into
Whittle and crossing KY 1611. The tornado partially removed the roof off a home and an outbuilding as it moved east-northeastward and crossed
KY 76 before rapidly intensifying to high-end EF2 intensity, significantly debarking and stubbing hardwood trees, and destroying mobile homes and a camper. East of there, the tornado caused additional significant EF2-EF3 damage at Levi Jackson Park, the Laurel County Fairgrounds, Crooked Creek Golf Course, and other residential areas. The tornado then abruptly weakened significantly, causing only EF0 damage as it crossed
KY 80 and
KY 488 before dissipating west of Lida at 11:56 pm EDT. == Non-tornadic effects ==