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 MONTGOMERY, MISSOURI
From 30-JUN-23 18:18:00 to 30-JUN-23 18:20:00 (CST-6)
Location: MIDDLETOWN
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LINCOLN, MISSOURI
From 30-JUN-23 19:05:00 to 30-JUN-23 19:07:00 (CST-6)
Location: HAWK PT
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in ST. LOUIS, MISSOURI
From 30-JUN-23 20:21:00 to 30-JUN-23 20:21:00 (CST-6)
Location: RICHMOND HGTS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ST. LOUIS, MISSOURI
From 30-JUN-23 20:01:00 to 30-JUN-23 20:10:00 (CST-6)
Location: FERNRIDGE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds blew down numerous trees, tree limbs and power lines in Creve Coeur, Olivette, Frontenac and Ladue areas. Some of the fallen trees and tree limbs blocked a few roads.

Hail in ST. LOUIS, MISSOURI
From 30-JUN-23 20:15:00 to 30-JUN-23 20:15:00 (CST-6)
Location: BURKE CITY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Pictures of hail and damage to a vehicle indicated that the hail may have been larger than an inch.

Hail in ST. LOUIS, MISSOURI
From 30-JUN-23 20:10:00 to 30-JUN-23 20:20:00 (CST-6)
Location: ST JOHNS
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A wide swath of large hail was reported in northern portions of St. Louis County. The areas that had large hail was Woodson Terrace, Saint John, Bel-Ridge, Kinloch, Ferguson, and Cool Valley.

Hail in CALLAWAY, MISSOURI
From 30-JUN-23 15:47:00 to 30-JUN-23 15:47:00 (CST-6)
Location: MOKANE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in OSAGE, MISSOURI
From 30-JUN-23 16:03:00 to 30-JUN-23 16:15:00 (CST-6)
Location: CHAMOIS
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in GASCONADE, MISSOURI
From 30-JUN-23 16:32:00 to 30-JUN-23 16:32:00 (CST-6)
Location: GASCONADE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ST. LOUIS, MISSOURI
From 30-JUN-23 16:50:00 to 30-JUN-23 17:02:00 (CST-6)
Location: OAKVILLE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ST. LOUIS, MISSOURI
From 30-JUN-23 17:00:00 to 30-JUN-23 17:00:00 (CST-6)
Location: WILDWOOD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ST. LOUIS, MISSOURI
From 30-JUN-23 17:05:00 to 30-JUN-23 17:10:00 (CST-6)
Location: ALLENTON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ST. LOUIS, MISSOURI
From 30-JUN-23 17:25:00 to 30-JUN-23 17:25:00 (CST-6)
Location: BALLWIN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ST. LOUIS, MISSOURI
From 30-JUN-23 17:16:00 to 30-JUN-23 17:16:00 (CST-6)
Location: TIMES BEACH
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds blew over a large tree.

Thunderstorm Wind in JEFFERSON, MISSOURI
From 30-JUN-23 17:28:00 to 30-JUN-23 17:45:00 (CST-6)
Location: HIGH RIDGE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds caused widespread damage across northern Jefferson County. In High Ridge, five large trees were blown down. In Arnold, numerous trees were blown down as well as tree limbs and power lines. Also, a semi was blown over in the Walmart parking lot in Arnold and a nearby fireworks tent was torn apart with merchandise blown all over the area. Several business signs were destroyed as well.

Thunderstorm Wind in ST. LOUIS, MISSOURI
From 30-JUN-23 17:39:00 to 30-JUN-23 17:45:00 (CST-6)
Location: MEHLVILLE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds bent a flagpole over and blew down numerous large tree limbs.