Several strong to severe thunderstorms moved into eastern Missouri in the afternoon hours of April 15th. These storms were initially producing copious large hail, but rapidly transitioned into tornadic storms. The first tornado was associated with a supercell ahead of a congealing line of convection moving rapidly toward the Mississippi River. A portion of this line of storms rapidly surged eastward, resulting in numerous tornadoes in Jefferson county in Missouri, and Monroe, Madison, St. Clair, and Washington counties in Illinois. In total, 12 tornadoes have been identified, including 3 EF-1s, 6 EF-0s, and 3 tornadoes of unknown intensity that produced no damage.

Thunderstorm Wind in ST. LOUIS, MISSOURI
From 15-APR-23 17:19:00 to 15-APR-23 17:26:00 (CST-6)
Location: VLY PARK
Magnitude: 68.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

South of the tornado path, there was scattered wind damage with minor shingle damage on several homes and businesses as well as numerous tree limbs blown down.

Thunderstorm Wind in ST. LOUIS, MISSOURI
From 15-APR-23 17:43:00 to 15-APR-23 17:55:00 (CST-6)
Location: (STL)LAMBERT FLD ST
Magnitude: 58.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm winds blew down numerous large tree limbs between St. Louis Lambert International Airport and Black Jack.

Tornado in JEFFERSON, MISSOURI
From 15-APR-23 17:24:00 to 15-APR-23 17:25:00 (CST-6)
Location: HILLSBORO
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado formed around 6:24pm CDT near the corner of Elm and 3rd streets on the northwest side of downtown Hillsboro, causing minor damage to the siding of the Good Shepherd Catholic Church. It continued eastward along the northern periphery of the downtown area, producing sporadic minor tree damage as it did so. When it approached Business Highway 21, the tornado damaged the facade and steeple of the First Baptist Church. Across the highway along 4th Street, the roof of the fire department building and a residence received minor damage. As the tornado moved over Vreeland Road and tracked along Sunny Lane, it briefly intensified, with several trees uprooted along the lane and minor roof damage occurring on an outbuilding. The tornado then weakened as it neared the end of Sunny Lane, dissipating in the wooded area just beyond the end of the roadway. Overall the tornado was rated EF0 with a max wind speed of 77 mph. The path length was 0.57 miles with a max path width of 200 yards. No deaths or injuries were reported.

Tornado in JEFFERSON, MISSOURI
From 15-APR-23 17:34:00 to 15-APR-23 17:36:00 (CST-6)
Location: PEVELY
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado formed on the northwest side of Pevely, MO around 634 PM CDT and tracked to the southeast into the northern portions of town producing minor roof, tree, siding and sign damage. After it crossed Pleasant Road it tracked in a more easterly direction, causing additional minor tree, power line and roof damage before lifting and dissipating on the western side of Oak Valley Golf Course and Resort. Overall the tornado was rated EF1 with a max wind speed of 100 mph. The path length was 0.93 miles with a max path width of 150 yards. No deaths or injuries were reported.

Tornado in JEFFERSON, MISSOURI
From 15-APR-23 17:30:00 to 15-APR-23 17:35:00 (CST-6)
Location: SILICA
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado formed northeast of Festus, MO along Old A Highway just after 6:30pm CDT on April 15. It moved northeastward through a subdivision off of Old A Highway and west of West City Park, producing sporadic minor structural damage. As the tornado moved into West City Park, it increased in strength, snapping and uprooting several trees. As it moved over Horine Road, it reached peak strength and produced significant damage to a home. The tornado weakened slightly as it continued on to Interstate 55, producing minor damage to homes, outbuildings, and trees as it did so. As the tornado crossed I-55, it overturned a southbound semi causing minor injuries to the driver. After crossing Interstate 55, the tornado turned more northeasterly and crossed McNutt Street and Lake Drive in Herculaneum, continuing to produce additional minor structural and tree damage. The tornado then turned more easterly and tracked along Joachim Avenue and just south of Herculaneum High School, where it produced minor roof damage to a church and knocked over light poles. As it entered the Dunkin and Fletcher Memorial Park it weakened and dissipated. Overall the tornado was rated EF1 with a max wind speed of 100 mph. The path length was 3.97 miles with a max path width of 360 yards. One injury was reported, but no fatalities.

Thunderstorm Wind in JEFFERSON, MISSOURI
From 15-APR-23 17:34:00 to 15-APR-23 17:34:00 (CST-6)
Location: PEVELY
Magnitude: 67.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Thunderstorm winds uprooted a large tree.

Thunderstorm Wind in ST. FRANCOIS, MISSOURI
From 15-APR-23 17:27:00 to 15-APR-23 17:37:00 (CST-6)
Location: LEADWOOD
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm winds blew down several power lines at the intersection of Highway 8 and Harmon Road. Also, several large tree limbs were blown down on the southwest side of Park Hills.

Thunderstorm Wind in ST. LOUIS, MISSOURI
From 15-APR-23 17:40:00 to 15-APR-23 17:40:00 (CST-6)
Location: FLORISSANT
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds blew down numerous tree limbs.

Hail in GASCONADE, MISSOURI
From 15-APR-23 15:00:00 to 15-APR-23 15:00:00 (CST-6)
Location: OWENSVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GASCONADE, MISSOURI
From 15-APR-23 15:00:00 to 15-APR-23 15:16:00 (CST-6)
Location: BAY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in FRANKLIN, MISSOURI
From 15-APR-23 15:30:00 to 15-APR-23 15:30:00 (CST-6)
Location: ETLAH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MONTGOMERY, MISSOURI
From 15-APR-23 15:41:00 to 15-APR-23 15:41:00 (CST-6)
Location: RHINELAND
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GASCONADE, MISSOURI
From 15-APR-23 15:55:00 to 15-APR-23 15:55:00 (CST-6)
Location: BLAND
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in GASCONADE, MISSOURI
From 15-APR-23 15:55:00 to 15-APR-23 16:06:00 (CST-6)
Location: BLAND
Magnitude: 61.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds caused damage across the southern portions of Gasconade County. Several large trees were blown down as well as tree limbs and power lines. One large tree fell across Highway 19 about 4 miles northwest of Oak Hill.

Hail in CRAWFORD, MISSOURI
From 15-APR-23 16:06:00 to 15-APR-23 16:06:00 (CST-6)
Location: CUBA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Flash Flood in ST. LOUIS, MISSOURI
From 15-APR-23 18:15:00 to 15-APR-23 21:00:00 (CST-6)
Location: CENTAUR
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Between 3 and 4 inches of rain fell in about a 3 hour period causing flash flooding. Several local creeks rose above flood stage. Several roads in the area were briefly flooded.

Hail in FRANKLIN, MISSOURI
From 15-APR-23 16:06:00 to 15-APR-23 16:55:00 (CST-6)
Location: UNION
Magnitude: 3.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A wide swath of large hail fell across Franklin County from Union through Villa Ridge, Grey Summit and Pacific. The largest hail stones, 3 inches in diameter, were reported on the north side of Pacific.

Hail in CRAWFORD, MISSOURI
From 15-APR-23 16:25:00 to 15-APR-23 16:30:00 (CST-6)
Location: BOURBON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in FRANKLIN, MISSOURI
From 15-APR-23 16:30:00 to 15-APR-23 16:37:00 (CST-6)
Location: SULLIVAN MEM ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Hail in ST. LOUIS, MISSOURI
From 15-APR-23 16:51:00 to 15-APR-23 17:11:00 (CST-6)
Location: ALLENTON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A swath of large hail fell from just east of Pacific to Eureka.

Thunderstorm Wind in ST. LOUIS, MISSOURI
From 15-APR-23 17:26:00 to 15-APR-23 17:40:00 (CST-6)
Location: TOWN AND COUNTRY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds blew down several large trees as well as numerous tree limbs in Town and Country, Frontenac and Ladue. Some of the fallen trees briefly blocked roadways.

Thunderstorm Wind in FRANKLIN, MISSOURI
From 15-APR-23 16:30:00 to 15-APR-23 16:35:00 (CST-6)
Location: SULLIVAN MEM ARPT
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm winds snapped off a large tree at it's base. Also, numerous tree limbs were blown down around town.

Thunderstorm Wind in FRANKLIN, MISSOURI
From 15-APR-23 16:46:00 to 15-APR-23 16:46:00 (CST-6)
Location: GRAY SUMMIT
Magnitude: 56.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds blew down several large tree limbs.

Hail in ST. LOUIS, MISSOURI
From 15-APR-23 17:00:00 to 15-APR-23 17:41:00 (CST-6)
Location: POND
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A wide swath of large hail up to golf ball sized hail fell over Wildwood, Ellisville, Manchester, Ballwin, Chesterfield, Creve Coeur, Maryland Heights and Town and Country.

Hail in JEFFERSON, MISSOURI
From 15-APR-23 17:37:00 to 15-APR-23 17:52:00 (CST-6)
Location: HILLSBORO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A wide swath of large hail fell across Jefferson County. Large hail was reported in Hillsboro, Pevely, Festus, Crystal City and Herculaneum.

Hail in ST. LOUIS (C), MISSOURI
From 15-APR-23 17:56:00 to 15-APR-23 18:00:00 (CST-6)
Location: CARONDELET
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ST. LOUIS (C), MISSOURI
From 15-APR-23 17:42:00 to 15-APR-23 17:55:00 (CST-6)
Location: CARONDELET
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm winds snapped off several large trees across the city and blew down numerous tree limbs.

Hail in JEFFERSON, MISSOURI
From 15-APR-23 16:55:00 to 15-APR-23 16:55:00 (CST-6)
Location: HOENE SPG
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in ST. LOUIS, MISSOURI
From 15-APR-23 17:20:00 to 15-APR-23 17:20:00 (CST-6)
Location: BALLWIN
Magnitude: 65.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm winds blew a large section of windows down at The Pointe, Ballwin Parks & Recreation center. This section of windows was by the giant indoor slide area of the indoor pool. Glass blew over into the pool. No one was killed or injured by this.

Tornado in ST. LOUIS, MISSOURI
From 15-APR-23 17:19:00 to 15-APR-23 17:27:00 (CST-6)
Location: MORSCHELS
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A weak tornado touched down on Valley Drive at 619 PM CDT just south of Lucie Avenue, snapping off several trees and causing minor roof damage to a couple of houses. It then moved northeast crossing Highway 141 about a third of a mile south of the I-44/Highway 141 interchange.  As it continued to the northeast paralleling I-44, it caused minor damage to trees, roofs and light posts. As the tornado approached Bowles Avenue, it began to move in an easterly direction across a light industrial area, but still paralleling I-44. Damage in this area remained minor with roof and tree damage. As it crossed the Meramec River, about half a mile south of I-44, it tracked in a more east southeasterly direction through Tapawingo National Golf Course causing damage to numerous trees and minor structural damage. The tornado lifted and dissipated near the intersection of West Watson Road and Bond Place. Overall the tornado was rated EF1 with a max wind speed of 100 mph. The path length was 4.47 miles with a max path width of 100 yards. No deaths or injuries were reported.

Thunderstorm Wind in ST. LOUIS, MISSOURI
From 15-APR-23 17:18:00 to 15-APR-23 17:19:00 (CST-6)
Location: MORSCHELS
Magnitude: 87.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Thunderstorm winds took most of the roof off of an outbuilding, uprooted several trees and snapped off a very large tree about two feet off the ground. Winds were estimated between 74 and 100 mph in this area.