Even though an old outflow boundary was across southeast Missouri and the far southern portions of Illinois during the morning hours, the boundary dissipated, allowing 75+ dew points to surge north along the Mississippi River. As skies cleared the atmosphere was able to quickly destabilize. Surface based CAPEs were in excess of 3000 J/kg with 40kts of 0 to 6km bulk shear. This combined with a shortwave trough that moved eastward across the region, produced strong to severe storms. There were numerous reports of damaging winds and some reports of large hail. There were three fatalities due to fallen trees.

Thunderstorm Wind in MADISON, ILLINOIS
From 02-JUL-23 00:13:00 to 02-JUL-23 00:15:00 (CST-6)
Location: PLEASANT RIDGE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm winds blew down several large trees and numerous tree limbs in the Maryville area.

Thunderstorm Wind in ST. CLAIR, ILLINOIS
From 01-JUL-23 23:49:00 to 01-JUL-23 23:59:00 (CST-6)
Location: VENICE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds blew down numerous tree limbs in East St. Louis and in the vicinity of Our Lady of the Snows Shrine.

Hail in CALHOUN, ILLINOIS
From 01-JUL-23 15:41:00 to 01-JUL-23 15:41:00 (CST-6)
Location: KAMPSVILLE
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in RANDOLPH, ILLINOIS
From 01-JUL-23 15:35:00 to 01-JUL-23 15:40:00 (CST-6)
Location: BREMEN
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds caused major damage to the roof of the historic Mary's River Covered Bridge, about 2 miles southwest of Bremen. Also, a barn was destroyed about two miles south of Blair.

Thunderstorm Wind in MONROE, ILLINOIS
From 01-JUL-23 15:10:00 to 01-JUL-23 15:10:00 (CST-6)
Location: COLUMBIA
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm winds blew down several trees just southeast of Columbia.

Hail in WASHINGTON, ILLINOIS
From 01-JUL-23 14:25:00 to 01-JUL-23 14:25:00 (CST-6)
Location: DUBOIS
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in JERSEY, ILLINOIS
From 01-JUL-23 15:05:00 to 01-JUL-23 15:10:00 (CST-6)
Location: MC CLUSKY
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds blew down several large trees near the intersection of Lodi Road and Illinois Route 109. Further east some power lines were blown down along Crystal Lake Road just west of Range Line Road.

Thunderstorm Wind in MARION, ILLINOIS
From 01-JUL-23 16:30:00 to 01-JUL-23 16:35:00 (CST-6)
Location: SALEM
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds blew down several large trees around town, as well as numerous tree limbs.

Thunderstorm Wind in CLINTON, ILLINOIS
From 01-JUL-23 15:15:00 to 01-JUL-23 15:15:00 (CST-6)
Location: KEYESPORT
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds snapped a two foot diameter tree off near the base.

Thunderstorm Wind in CLINTON, ILLINOIS
From 01-JUL-23 15:25:00 to 01-JUL-23 15:25:00 (CST-6)
Location: BREESE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds blew down several large tree limbs in Breese.

Hail in CLINTON, ILLINOIS
From 01-JUL-23 15:12:00 to 01-JUL-23 15:20:00 (CST-6)
Location: CARLYLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in WASHINGTON, ILLINOIS
From 01-JUL-23 16:10:00 to 01-JUL-23 16:10:00 (CST-6)
Location: ASHLEY
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds blew down several trees, as well as numerous tree limbs around town.

Thunderstorm Wind in MADISON, ILLINOIS
From 01-JUL-23 14:45:00 to 01-JUL-23 15:15:00 (CST-6)
Location: MADISON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Widespread wind damage across Madison County. Numerous trees, tree limbs and power lines were blown down. A couple of power poles were snapped off as well. In Madison, a small market sustained moderate roof damage. In Collinsville, the false roof of a building that covered up the A/C units was blown off and tossed onto Route 66 below. Also, a nearby Catholic school gymnasium sustained moderate roof damage. The tree damage was reported in Madison, Granite City, Roxana, Collinsville, Edwardsville, Glen Carbon, Maryville, Troy and Marine.