During the evening, clusters of storms developed just north of a surface warm front that extended from the Missouri bootheel northeastward along the Ohio River. The warm front became stationary, and the area of storms tracked northeast across the same areas through the overnight and early morning hours. The repeated bouts of heavy-rain producing storms lasted 8 to 12 hours, resulting in excessive rainfall.

Flood in JACKSON, ILLINOIS
From 29-APR-17 08:00:00 to 29-APR-17 17:00:00 (CST-6)
Location: MAKANDA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The flash flooding during the overnight and early morning hours transitioned to a more prolonged flooding situation. Several city streets were flooded and impassable in Carbondale, including a main thoroughfare. Highway 51 was flooded in a couple of spots in the Carbondale area. In Makanda, the city park was underwater. A Canadian National railroad track was flooded at a street crossing. A trained spotter near the western border of the county measured 4.20 inches during the overnight and early morning storms.

Flood in WILLIAMSON, ILLINOIS
From 29-APR-17 08:00:00 to 29-APR-17 17:00:00 (CST-6)
Location: JOHNSTON CITY
Flood cause: Heavy Rain
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flooding continued from the torrential rains that occurred during the overnight and early morning hours. In Johnston City, four feet of water covered an intersection, and water rescues were taking place in the area. Some residents of Johnston City were forced to evacuate their homes and relocate to a Red Cross shelter in Marion. A television station at Carterville measured 7.34 inches in the previous 24 hours, and 5.82 inches during the morning hours.

Hail in SALINE, ILLINOIS
From 28-APR-17 23:07:00 to 28-APR-17 23:07:00 (CST-6)
Location: CARRIERS MILLS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Flash Flood in GALLATIN, ILLINOIS
From 28-APR-17 23:47:00 to 29-APR-17 07:00:00 (CST-6)
Location: SHAWNEETOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous locations along Illinois Highway 13 were nearly impassable due to flash flooding. A trained spotter near Ridgway received 5.36 inches of rain in the previous 24 hours.

Flash Flood in WHITE, ILLINOIS
From 29-APR-17 04:00:00 to 29-APR-17 08:00:00 (CST-6)
Location: ENFIELD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A section of U.S. Highway 45 on the north side of Enfield was closed due to high water over the roadway. A street in the city of Carmi was closed due to flooding, and warning signs were placed on several other city streets due to water flowing over them. In Crossville, a creek was flowing out of its banks across a roadway. A trained spotter in Carmi measured 5.35 inches of rain in the previous 24 hours.

Flash Flood in SALINE, ILLINOIS
From 28-APR-17 22:52:00 to 29-APR-17 07:00:00 (CST-6)
Location: HARRISBURG
Flood cause: Heavy Rain
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Widespread flash flooding of streets occurred throughout the Harrisburg area, including about 10 square blocks that were impassable in the city. A trained spotter in Eldorado measured 5.25 inches in the overnight storms.

Flood in WHITE, ILLINOIS
From 29-APR-17 08:00:00 to 29-APR-17 13:00:00 (CST-6)
Location: CROSSVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Following the flash flooding during the early morning hours, some road flooding lingered into the early afternoon hours. Illinois Route 1 was flooded and impassable between Carmi and Crossville. U.S. Route 45 remained flooded near Enfield. Several streets in Carmi were flooded.

Flash Flood in JACKSON, ILLINOIS
From 29-APR-17 04:04:00 to 29-APR-17 08:00:00 (CST-6)
Location: CARBONDALE
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Broadcast Media

More than 150 students on the campus of Southern Illinois University were evacuated to other buildings after a dormitory was flooded. Another campus building sustained minor basement flooding. Widespread street flooding occurred, especially in the more densely populated sections of Carbondale. The eastbound lanes of Route 13 were closed in Carbondale due to high water. Nearly every road in one large neighborhood was impassable. Much of the community of Makanda was flooded, where a newly constructed bridge in the middle of town was completely underwater.

Flash Flood in WILLIAMSON, ILLINOIS
From 29-APR-17 04:41:00 to 29-APR-17 08:00:00 (CST-6)
Location: JOHNSTON CITY
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous roads on the northwest side of Herrin were completely flooded and impassable. Water rescues were executed in town. In Marion, numerous roads and at least a few buildings were flooded. In Crainville, a large sinkhole opened up, forcing the evacuation of two homes. The road to the spillway at Devils Kitchen Lake was closed.

Flood in FRANKLIN, ILLINOIS
From 29-APR-17 08:00:00 to 29-APR-17 17:00:00 (CST-6)
Location: BENTON
Flood cause: Heavy Rain
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There was extensive flooding of a neighborhood in the northeast part of Benton from heavy rain during the overnight and early morning hours. Homes on two streets were flooded. In West Frankfort, residents of an apartment complex were evacuated. A co-operative observer near Plumfield measured 4.10 inches of rain in the previous 24 hours.