The following events were reported: Hail, Thunderstorm Wind, Tornado. These occurred near station USW00013994, approximately 19.7922 km away, between 2013-05-31 18:44:00 and 2013-05-31 19:29:00. The events included records with hailstones measuring 45.5 inches.The events resulted in 9 injuries and 0 fatalities. The events caused property damage valued at 60000000.0 and crop damage of 0.0. Episode Narrative: 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. Storms developed along an outflow boundary that was laid out along the I-70 corridor. Event Narrative: A tornado touched down about four miles southwest of Weldon Spring in St. Charles County, Missouri. It downed trees, blew over empty tractor trailers, and caused minor damage to construction equipment. It moved east-northeast into Weldon Spring Heights and the Missouri Research Park (on the south side of Weldon Spring) causing roof, window, and solar panel damage to a few structures as well as downing more trees before crossing Interstate 64. The tornado passed within one half of a mile of the National Weather Service Weather Forecast Office which is located in the Missouri Research Park. The tornado continued moving east-northeast through densely populated residential areas of southern St. Charles County, south of Highway 94. Roofing was torn off of Bryan Middle School and blown 100 yards, many houses suffered varying degrees of roof (from minor damage to removal of entire roof), wall (from minor damage to total collapse), and overall structural damage, and thousands of trees were damaged. The most intense damage, rated EF3, occurred on Haversham Drive where only the interior walls were left standing of three homes. The tornado began to move a bit more easterly, widening to nearly 1000 yards (or a half-mile), causing damage in residential areas and the St. Charles Family Arena before crossing the Missouri River into St. Louis County just south of Interstate 70.||The tornado caused damage to 765 homes in St. Charles County. Seven hundred twenty-three homes suffered minor damage, 34 homes suffered major damage, and 8 homes were destroyed. Three hundred forty-eight businesses sustained minor damage, while 25 businesses had major damage. Cleanup costs alone for St. Charles County was 2.4 million dollars, with approximately 50,000 tons of tree and limb debris removed. There were 8 minor injuries due to the tornado.||The path length of the tornado in St. Charles County was 14.8 miles with a max path width of 950 yards. The damage for this segment was estimated to be EF3 with max wind speeds of 150 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. 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. 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. 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. Thunderstorm winds blew down a large tree onto an unoccupied car that was parked at the Historic Daniel Boone Home & Heritage Center. The car sustained major damage. One inch hail fell in Maryland Heights. A tornado touched down in extreme western Jefferson County near Highway NN and Apke Lane. It moved to the east and most of the damage consisted of snapped and downed trees and broken tree limbs. In the Byrnes Mill area several mobile homes were damaged from fallen trees. In Scotsdale, several school buildings at Our Lady Queen of Peace Church suffered minor damage. The tornado lifted and dissipated west of Rustic Trails Drive, around 2.7 miles east of Byrnes Mill. The tornado path length was 12.4 miles and the max path width was 200 yards. The damage was rated EF1 with max wind speeds of 100 MPH. One inch hail fell in Florrisant. A tornado touched down in the Columbia Bottom Conservation Area, about 3 miles northeast of the interchange of I-270 and Columbia Bottom Road. It uprooted a large tree in this location, then traveled to the northeast. It uprooted another large tree just northeast of Upper Columbia Bottom Road, before turning a bit more easterly and crossed the Mississippi River into Madison County Illinois. For this segment of the tornado, the path length in St. Louis County was 2 miles with a max path width of 50 yards. The damage for this segment was rated EF1 with max wind speeds of 90 MPH. Overall, the entire tornado path length was 10.6 miles with a max path width of 150 yards. The tornado was rated EF3 with max wind speeds of 160 MPH. Thunderstorm winds snapped off several large trees in southwestern St. Charles County between Highway DD and Highway 94. A wide swath of wind damage, just north of the path of the tornado that moved through St. Louis County extended from the I-270/Lindbergh Boulevard interchange eastward to the just west of the Mississippi River. The most intense wind damage was to the Ramada Inn on the northeast side of the I-270/Lindbergh Boulevard interchange. It lost about half its roof with some of the debris landing on cars in the parking lot destroying them. More of the debris landed over two tenths of a mile away, damaging or destroying a number of campers and RVs at an RV business with a number of vehicles having 2x4s driven into them. Another nearby hotel sustained moderate roof damage as well. Otherwise, most of the wind damage consisted of trees blown over, numerous large tree limbs blown down, as well as power lines being blown down. There was one injury to a hotel occupant at the Ramada Inn,  the person sustained a broken arm.