As strong solar heating destabilized the atmosphere, numerous clusters of intense thunderstorms blossomed from southeast Missouri to southwest Indiana. The main impact associated with these storms was flash flooding. Several locations picked up torrential rainfall amounts over a short time period. Over four inches of rain occurred in Union County, prompting water rescues from vehicles. Damaging winds up to around 60 mph occurred with a few of the storms as well. The environment was characterized by moderate to strong instability and moderate wind shear. Effective bulk wind shear values of 25 to 40 knots were observed. The storms developed east of a weak low pressure center over Missouri.

Hail in JEFFERSON, ILLINOIS
From 16-JUN-19 15:58:00 to 16-JUN-19 15:58:00 (CST-6)
Location: WALTONVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in JACKSON, ILLINOIS
From 16-JUN-19 15:10:00 to 16-JUN-19 15:10:00 (CST-6)
Location: DE SOTO
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A large tree was snapped. A few miles away, the peak wind gust at the Carbondale airport was 55 mph.

Thunderstorm Wind in UNION, ILLINOIS
From 16-JUN-19 15:16:00 to 16-JUN-19 15:16:00 (CST-6)
Location: COBDEN
Magnitude: 52.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were blown down on power lines.

Thunderstorm Wind in MASSAC, ILLINOIS
From 16-JUN-19 17:45:00 to 16-JUN-19 17:55:00 (CST-6)
Location: JOPPA
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Trees were down across parts of Massac County, mainly in the Joppa area.

Flash Flood in WAYNE, ILLINOIS
From 16-JUN-19 16:19:00 to 16-JUN-19 19:00:00 (CST-6)
Location: WAYNE CITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Water was flowing over Illinois Highway 15 in multiple places near Wayne City. A mesonet site at Fairfield measured 3.45 inches of rain in 24 hours.

Flash Flood in JEFFERSON, ILLINOIS
From 16-JUN-19 17:30:00 to 16-JUN-19 19:00:00 (CST-6)
Location: BLUFORD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous roads were flooded around Bluford, including Highway 15. Several wrecks were reported on Interstates 57 and 64 due to water ponding issues.

Flash Flood in JACKSON, ILLINOIS
From 16-JUN-19 16:29:00 to 16-JUN-19 19:00:00 (CST-6)
Location: MURPHYSBORO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A couple of secondary roads south of Murphysboro were covered with water.

Flash Flood in UNION, ILLINOIS
From 16-JUN-19 17:00:00 to 16-JUN-19 19:00:00 (CST-6)
Location: COBDEN
Flood cause: Heavy Rain
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Severe flash flooding impacted Union County. There were two water rescues in the county. One car stalled in high water on Mount Glen Road near Cobden. First responders were able to rescue the driver, a young female. The second water rescue involved a vehicle in the Trail of Tears State Forest near Ware. The vehicle was swept off State Forest Road where it crosses Clear Creek. Two people were in the vehicle at the time it was swept off the road. The male involved was able to escape. The body of the other person in the vehicle, a female in her late 50's, was found deceased the following morning less than a mile downstream from the vehicle. Elsewhere in the area, one lane of Highway 146 near the intersection of Highway 3 was flooded. A trained spotter reported 4.0 inches of rainfall in 24 hours three miles east of Ware. The public reported 4.5 inches of rain in 24 hours at Cobden.