EF2 tornado in St. Louis County, Missouri

The tornado crossed the Missouri River from St. Charles County into St. Louis County just south of Interstate 70. As it moved through the Riverport area, it caused major damage to one of the buildings at Hollywood Casino. Part of the roof and most of the siding were torn off of a section of the casino that housed maintenance and staff offices. Five large power poles were snapped off at the base. The damage in this area was rated EF2. Also, numerous trees were snapped off. Further to the east in the Riverport area, a gas station lost part of its canopy and a nearby hotel sustained minor roof damage as well as several windows blown out. The tornado then crossed Interstate 70 into the Earth City area. As it crossed the highway at the intersection of I-70 and Earth City Expressway it knocked down the large steel truss that holds signs for the east bound side of I-70 into the west bound lanes of the highway. Traffic was backed up for hours in this area due to the fallen sign and numerous power lines as well as debris laying across the interstate. North of I-70 the tornado widened to a mile wide with the most significant damage centered just northwest of the I-70/Earth City Expressway interchange. One warehouse building had a section of the pre-cast concrete wall collapse outward and fall onto the parking lot on the southeast corner. Meanwhile on the north facing side of the warehouse, several bay doors were blown in and several tractor trailers and delivery trucks were blown over. The building next door had roof damage and an unoccupied car nearby was flipped onto its roof and another one was rolled as well. The damage in this area was rated EF2. Further to the east and northeast, the Point 70 office building sustained extensive window damage and another warehouse had a quarter of its roof peeled off. Spectrum Brands warehouse building on Corporate Exchange Drive had a very large section of pre-cast concrete walls collapse inward and damage here was rated EF2. The tornado continued to the east, crossing Interstate 270 between Interstate 70 and St. Charles Rock Road. Numerous trees, power poles and power lines were blown down across Bridgeton. An apartment building on Natural Bridge Road lost its entire roof with some of the debris landing on cars in the parking lot. Several other apartment buildings had minor roof damage. Damage in this area was rated EF2. The tornado crossed the northern portions of Lambert-St. Louis International Airport, causing minor damage to four outbuildings. From there the tornado continued east, blowing down or uprooting numerous large trees, power poles and power lines in Berkley, Kinloch, Ferguson, and Dellwood mainly along and north of Chambers Road. Several of the large trees fell onto houses and vehicles causing minor to major damage. As it crossed New Halls Ferry Road it began to go in a more east northeasterly direction, paralleling Interstate 270 for a time. A gas station at the intersection of Dunn Road and Old Halls Ferry Road had one of its canopies collapsed. Just east of Highway 367, six power poles were snapped off along Dunn Road on the north side of I-270. A bit further east, just east of Bellefontaine Road, an apartment complex on N. Garden Drive had eight of its buildings sustain major roof damage. Otherwise, most of the damage in the area was to trees and power lines. A few of the trees landed on homes causing varying degrees of damage. The tornado then lifted and dissipated on the banks of the Mississippi River about six tenths of a mile north northeast of the intersection of I-270 and Columbia Bottom Road. The tornado caused damage to 612 homes in St. Louis County. Five hundred and ten homes suffered minor damage, 101 homes suffered major damage, and one home was destroyed. One hundred twenty-one businesses sustained minor damage, while 5 businesses had major damage. Cleanup costs alone for St. Louis County was 4.3 million dollars.

The path length of the tornado in St. Louis County was 17.0 miles with a max path width of a mile wide. The damage for this segment was estimated to be EF2 with max wind speeds of 130 MPH. Overall, the entire tornado path length was 31.8 miles with a max path width of 1 mile and a maximum damage rating of EF3.

Storms developed along an outflow boundary that was laid out along the I-70 corridor. The storms produced wind damage, large hail as well as 9 tornadoes. Two of the tornadoes were rated EF3 as they moved through the St. Louis metro area. Also, heavy rain fell causing flash flooding in some locations, which persisted into the early morning hours of June 1st.