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.

Tornado in MONROE, ILLINOIS
From 15-APR-23 17:34:00 to 15-APR-23 17:54:00 (CST-6)
Location: CHALFIN BRIDGE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

At 6:34 PM CDT a tornado touched down on Bluff Road about 1.8 miles southwest of Maeystown. As it tracked to the northeast it caused minor tree damage as well as moderate damage to a farm outbuilding on the southwest side of town. It continued to the northeast across Monroe County causing sporadic tree damage and destroyed a small outbuilding. About 1.5 miles southwest of Hecker the roof of a barn was removed. The tornado crossed into southern St. Clair County about 0.4 of a mile northwest of Hecker. The tornado was rated EF0 with a max wind speed of 85 mph. The path length in Monroe County was 15.91 miles with a max path width of 100 yards. Overall, the tornado was rated EF1 with a max wind speed of 100 mph. The total path length was 19.57 miles with a max path width of 100 yards. No deaths or injuries were reported.

Thunderstorm Wind in MONROE, ILLINOIS
From 15-APR-23 17:50:00 to 15-APR-23 17:55:00 (CST-6)
Location: MADONNAVILLE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm winds blew down several large trees and tree limbs at a residence on Ahne Road just northeast of intersection with Kk Road. Also, a small portion of an outbuilding roof was torn off. Further to the east a large section of tree was blown down next to a mobile home.

Tornado in ST. CLAIR, ILLINOIS
From 15-APR-23 17:54:00 to 15-APR-23 17:59:00 (CST-6)
Location: PADERBORN
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado crossed into St. Clair County about 0.4 of a mile northwest of Hecker. The tornado intensified as it crossed Illinois Route 159. In this area, it destroyed a large barn, caused minor roof damage to a house and snapped off a number of trees. It continued to track to the northeast causing sporadic tree damage and minor roof damage to outbuildings before lifting and dissipating on Klein School Road just north of intersection with Illinois Route 156 at 6:59 PM CDT. The tornado was rated EF1 in St. Clair County with a max wind speed of 100 mph. The path length was 3.66 miles with a max path width of 100 yards. Overall, the tornado was rated EF1 with a max wind speed of 100 mph. The total path length was 19.57 miles with a max path width of 100 yards. No deaths or injuries were reported.

Thunderstorm Wind in MONROE, ILLINOIS
From 15-APR-23 17:50:00 to 15-APR-23 18:00:00 (CST-6)
Location: VALMEYER
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds blew down several trees along Illinois Route 156 between Valmeyer and Foster Pond.

Hail in MONROE, ILLINOIS
From 15-APR-23 17:48:00 to 15-APR-23 17:48:00 (CST-6)
Location: VALMEYER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tornado in MONROE, ILLINOIS
From 15-APR-23 17:39:00 to 15-APR-23 17:46:00 (CST-6)
Location: HARRISONVILLE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down at 6:39 PM CDT just east of intersection of Harris Road and B Road and tracked to the east northeast. There was some minor roof damage to a couple of outbuildings before the tornado crossed Bluff Road, around 2.6 miles south southwest of Valmeyer. For the remainder of the tornado path the damage was mostly to trees. However, a house sustained minor roof damage on Deer Hill Road, about 2.4 miles southeast of Valmeyer. Then the tornado lifted and dissipated around 6:46 PM CDT. Overall the tornado was rated EF0 with a max wind speed of 85 mph. The tornado path length is 4.97 miles with a max path width of 100 yards. No deaths or injuries were reported.

Thunderstorm Wind in MONROE, ILLINOIS
From 15-APR-23 17:39:00 to 15-APR-23 17:39:00 (CST-6)
Location: HARRISONVILLE
Magnitude: 64.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Thunderstorm winds blew a small section of roof off of an outbuilding.

Tornado in MONROE, ILLINOIS
From 15-APR-23 17:43:00 to 15-APR-23 17:44:00 (CST-6)
Location: COLUMBIA GEBHARDT AR
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A tornado briefly touched down in the Mississippi river bottoms on the northwest side of Columbia, IL. The only evidence of this tornado was a video provided via local media. Duration was likely less than 1 minute, no damage or injuries. The tornado was rated EFU with an estimated path length of 0.34 miles and an estimated path width of 25 yards.

Thunderstorm Wind in MONROE, ILLINOIS
From 15-APR-23 17:56:00 to 15-APR-23 17:57:00 (CST-6)
Location: HECKER
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Widespread wind damage occurred in Hecker just to the south of the tornado. Several homes in town suffered minor to moderate roof damage. Also, several large trees were snapped off, a couple of power poles were broken off as well and numerous tree limbs were blown down.

Thunderstorm Wind in ST. CLAIR, ILLINOIS
From 15-APR-23 17:56:00 to 15-APR-23 17:57:00 (CST-6)
Location: PADERBORN
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A power pole was snapped off along Illinois Route 159 to the north of the tornado track. Also, the thunderstorm winds caused minor roof damage to a house.

Thunderstorm Wind in MADISON, ILLINOIS
From 15-APR-23 18:10:00 to 15-APR-23 18:10:00 (CST-6)
Location: ROXANA
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Thunderstorm Wind in MADISON, ILLINOIS
From 15-APR-23 18:08:00 to 15-APR-23 18:09:00 (CST-6)
Location: (ALN)STL RGNL ARPT A
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm winds snapped off a two foot diameter tree about a mile west of the airport. At St. Louis Regional Airport (KALN) a large section of a hanger's roof was peeled off.

Tornado in ST. CLAIR, ILLINOIS
From 15-APR-23 17:59:00 to 15-APR-23 18:00:00 (CST-6)
Location: SIGNAL HILL
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A brief tornado touched down at 6:59 PM CDT on Walnut Lane and tracked to the east northeast along Signal Hill Boulevard. It caused damage to numerous trees and minor structural damage. Overall, the tornado was rated EF0 with max wind speed of 84 mph. The path length was 0.58 miles and a max path width of 100 yards. No deaths or injuries were reported.

Tornado in MADISON, ILLINOIS
From 15-APR-23 18:01:00 to 15-APR-23 18:02:00 (CST-6)
Location: COLLINSVILLE
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A tornado briefly touched down just to the west of Collinsville, IL. The only evidence of this tornado was a video provided via local media. Duration was likely less than 1 minute, no damage or injuries. The tornado was rated EFU with an estimated path length of 0.16 miles and an estimated path width of 25 yards.

Tornado in WASHINGTON, ILLINOIS
From 15-APR-23 18:33:00 to 15-APR-23 18:34:00 (CST-6)
Location: COVINGTON
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A tornado briefly touched down about a third of a mile north of Covington, IL. The only evidence of this tornado was a video provided via social media. Duration was likely less than 1 minute, no damage or injuries. The tornado was rated EFU with an estimated path length of 0.17 miles and an estimated path width of 50 yards.

Tornado in ST. CLAIR, ILLINOIS
From 15-APR-23 18:03:00 to 15-APR-23 18:04:00 (CST-6)
Location: BELLEVILLE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down at 7:03 PM CDT at the intersection of West E Street and N 7th Street and tracked to the north northeast. Damage was limited to trees and power lines. The tornado lifted and dissipated on Anna Street just east of Helen Street. The tornado was rated EF0 with a max wind speed of 85 mph. The path length was 1.12 miles and a max path width of 90 yards. No deaths or injuries were reported.

Tornado in ST. CLAIR, ILLINOIS
From 15-APR-23 18:03:00 to 15-APR-23 18:07:00 (CST-6)
Location: BELLEVILLE
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down at 7:03 PM CDT just south of the intersection of N 2nd Street and West F Street and tracked to the northeast. It initially caused minor tree and power line damage. Then as it moved through moved through the Forest Hill Drive area, it briefly intensified either snapping off or uprooting several very large trees. Several of the trees fell onto homes, causing more significant structural damage. Further to the northeast there was minor structural damage to a   couple of homes, apartment buildings and businesses. Then the tornado lifted and dissipated on Adeline Drive just west of Sierra Drive at 7:07 PM CDT. The tornado was rated EF1 with a max wind speed of 98 mph. The path length was 3.04 miles and a max path width of 200 yards. No deaths or injuries were reported.

Thunderstorm Wind in ST. CLAIR, ILLINOIS
From 15-APR-23 18:08:00 to 15-APR-23 18:09:00 (CST-6)
Location: SHILOH
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Thunderstorm winds caused a swath of damage across an area from just east of N. Green Mount Road and north of Lebanon Avenue. Several trees and fences were blown down, numerous tree limbs blown down, a large wooden residential playground was damaged and several homes had some shingles missing.

Thunderstorm Wind in MADISON, ILLINOIS
From 15-APR-23 18:35:00 to 15-APR-23 18:40:00 (CST-6)
Location: ST JACOB
Magnitude: 61.00 EG
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew off part of an outbuilding about a mile south of St. Jacob. Further east, about a quarter of a roof on a large horse barn was blown off. One of the horses was killed by the flying debris. Thirty five other horses busted out of their fences and stalls as they ran scared from the storm. The roof debris was thrown about a 100 yards to the east.

Thunderstorm Wind in ST. CLAIR, ILLINOIS
From 15-APR-23 18:16:00 to 15-APR-23 18:16:00 (CST-6)
Location: FURMAN
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds blew down numerous large tree limbs.

Thunderstorm Wind in ST. CLAIR, ILLINOIS
From 15-APR-23 18:20:00 to 15-APR-23 18:20:00 (CST-6)
Location: ST LIBORY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds blew down numerous large tree limbs.

Thunderstorm Wind in MONTGOMERY, ILLINOIS
From 15-APR-23 18:55:00 to 15-APR-23 18:55:00 (CST-6)
Location: LITCHFIELD MUNI ARPT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds blew down a couple of trees just west of Litchfield.

Thunderstorm Wind in CLINTON, ILLINOIS
From 15-APR-23 18:35:00 to 15-APR-23 18:36:00 (CST-6)
Location: TRENTON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm winds blew down several trees around town as well as numerous tree limbs. Also, a couple of fences were blown down and a trampoline was tossed.

Thunderstorm Wind in WASHINGTON, ILLINOIS
From 15-APR-23 18:34:00 to 15-APR-23 18:37:00 (CST-6)
Location: NEW MINDEN
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds blew down numerous tree limbs around town. One of the large tree limbs fell onto a power line pulling it down.

Thunderstorm Wind in MARION, ILLINOIS
From 15-APR-23 19:20:00 to 15-APR-23 19:20:00 (CST-6)
Location: TEXAS CORNER
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm winds blew down a large tree and numerous tree limbs around town. Also, several power lines were blown down.