Earlier in the day on June 30th, an MCS made its way across southern Iowa and northern Missouri into north-central Illinois. As it moved eastward, an outflow boundary moved south and interacted with a surface boundary stretching across central Missouri. There was a strong gradient of surface-based CAPE. Storms developed and followed that gradient and frontal boundary southeast across central Missouri into south central Illinois. The severe storms produced large hail and damaging winds.

Hail in ST. CLAIR, ILLINOIS
From 30-JUN-23 18:36:00 to 30-JUN-23 18:36:00 (CST-6)
Location: FAYETTEVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ST. CLAIR, ILLINOIS
From 30-JUN-23 18:31:00 to 30-JUN-23 18:33:00 (CST-6)
Location: ST LIBORY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds caused significant tree and power line damage in St. Libory. One home sustained moderate roof damage due to a fallen tree. No deaths or injuries were reported.

Hail in MADISON, ILLINOIS
From 30-JUN-23 19:40:00 to 30-JUN-23 19:48:00 (CST-6)
Location: BLACK JACK
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in MADISON, ILLINOIS
From 30-JUN-23 20:30:00 to 30-JUN-23 20:31:00 (CST-6)
Location: GRANITE CITY
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds blew down numerous large tree limbs.

Thunderstorm Wind in MADISON, ILLINOIS
From 30-JUN-23 20:40:00 to 30-JUN-23 20:45:00 (CST-6)
Location: LE CLAIRE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew down numerous tree limbs and one tree on the southeast side of town.

Hail in MADISON, ILLINOIS
From 30-JUN-23 20:49:00 to 30-JUN-23 20:54:00 (CST-6)
Location: GLEN CARBON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in MONROE, ILLINOIS
From 30-JUN-23 17:40:00 to 30-JUN-23 17:56:00 (CST-6)
Location: BIXBY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew down numerous trees, tree limbs and power lines across the northern portions of Monroe County. Some of the trees and power lines were down at the intersection of St. Paul Street and Gardner Street in Columbia. Columbia's American Legion Park and YMCA sustained considerable damage at both locations. A couple of homes sustained moderate roof damage due to fallen trees. One person was briefly trapped in a vehicle due to a fallen power line. Also, some of the fallen trees and tree limbs were blocking Illinois Route 3 just southeast of Columbia. Several power poles were blown down near the intersection of Bluff Road and Sand Bank Road. No deaths or injuries were reported.

Thunderstorm Wind in ST. CLAIR, ILLINOIS
From 30-JUN-23 17:55:00 to 30-JUN-23 18:20:00 (CST-6)
Location: PHELPS
Magnitude: 60.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Widespread wind damage across the southern portions of St. Clair County. Numerous large trees, tree limbs, and power lines were blown down in Millstadt, Smithton, Freeburg and south of Mascoutah. Several roads in the area were blocked by the fallen trees, tree limbs and power lines. In Freeburg, the grain bins next to the high school were destroyed. Also, a large barn lost part of it's roof near Freeburg. No deaths or injuries were reported.

Thunderstorm Wind in WASHINGTON, ILLINOIS
From 30-JUN-23 18:35:00 to 30-JUN-23 19:20:00 (CST-6)
Location: JOHANNISBURG
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Widespread wind damage occurred across most of Washington County. As the severe storm moved into the western portions of the county, several outbuildings and barns sustained major damage about 2 miles southwest of Johannisburg, along Illinois Route 15.  In Johannisburg, the steeple on St. Johns Evangelical Church was blown over onto the roof of the main church building causing catastrophic damage. In Venedy, widespread tree damage around town, a grain bin was damaged, as well as several power lines blown down. Three miles south southeast of Venedy, at the intersection of County Road 12 and Stone Church Road, a training center sustained major roof damage. About 3 miles south southwest of Okawville, a large barn was destroyed. Then just southwest of Okawville, multiple large treetops were snapped off and a barn and a machine shed were destroyed. Along County Highway 13, south of Okawville, two small barns were destroyed and two grain bins sustained minor damage. In Addieville, there was widespread tree and power line damage, as well as roof damage to a local business. As the storm moved into the Nashville area, numerous trees, tree limbs, power poles and power lines were blown down. One house sustained moderate roof damage due to a fallen tree. Also, a local business sustained roof damage with water causing interior damage as well. In Ashley, there was widespread tree, tree limbs and power lines blown down. One large tree fell onto a house causing moderate roof damage. Also, a number of trees were blown down onto Illinois Route 15. In Radom, a large tree was blown down onto a garage, destroying it.  No deaths or injuries were reported.