Elevated convection developed in response to low level moisture convergence just north of a slowly retreating warm front. With very high precipitable water values in excess of 2 inches, this created very heavy rainfall rates as the storms trained over the same locations for over 5 hours. This caused flash flooding in a number of locations.

Flash Flood in ST. CLAIR, ILLINOIS
From 12-AUG-19 04:25:00 to 12-AUG-19 08:45:00 (CST-6)
Location: VENICE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Up to 5 inches of rain fell in less than 5 hours causing flash flooding. Numerous roads across the far northern portions of St. Clair County were flooded. Illinois Route 159 at the intersection with Bethel Mine Road had 7 inches of flowing water over it. Also, U.S. Highway 50 between O'Fallon and Lebanon was closed due to flooding.

Flash Flood in MARION, ILLINOIS
From 12-AUG-19 04:25:00 to 12-AUG-19 09:30:00 (CST-6)
Location: GREENDALE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Up to 6 inches of rain fell in about 5 hours causing flash flooding. Numerous roads were flooded including several spots along Kinoka Road east of Patoka, Illinois Route 37 at Basom Road, and U.S. Highway 51 south of Patoka.

Flash Flood in JERSEY, ILLINOIS
From 12-AUG-19 03:00:00 to 12-AUG-19 08:15:00 (CST-6)
Location: GRAFTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Up to 4 inches of rain fell in less than 5 hours causing flash flooding. Numerous roads were flooded and several cars were stuck in high water. No injuries were reported.

Flash Flood in BOND, ILLINOIS
From 12-AUG-19 03:30:00 to 12-AUG-19 09:30:00 (CST-6)
Location: GILMORE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Up to 9 inches of rain fell in about 5 hours causing flash flooding. The highest rainfall was reported in Greenville, 9.01 inches. Numerous roads through out Bond County were flooded, including Illinois Route 127 at Hazel Dell Road, Illinois Route 140 between Pokey Road and the Shoal Creek Bridge, and Illinois Route 127 near Airport Avenue just south of Greenville. One woman had to be rescued from the roof of her car after she drove it into high flowing water on Airport Avenue just west of the Beaver Creek Bridge. No injuries were reported.

Flash Flood in MADISON, ILLINOIS
From 12-AUG-19 05:00:00 to 12-AUG-19 08:15:00 (CST-6)
Location: EAGLE PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Up to 9 inches of rain fell over a 6 hour period, causing flash flooding, especially in the Granite City area where the heaviest rain fell. Numerous cars were abandoned due to street flooding over a large portion of Granite City. The flooding caused damage to more than 1,000 homes in the city, as well as numerous businesses.  Granite City High School sustained damage due to the flash flooding and the beginning of the school year had to be delayed for a couple of weeks while cleanup and repairs were made to the school. In Godfrey, 6 to 8 inches of water was covering the road at the intersection of Enos and Pierce Lanes. In Alhambra, two feet of water was covering IL Route 140 near Alhambra Fireman and Legion Park.  In Alton, one foot of water was over the road at the intersection of W. Elm Street and Virden Street.

Flash Flood in MACOUPIN, ILLINOIS
From 12-AUG-19 06:30:00 to 12-AUG-19 09:00:00 (CST-6)
Location: BRIGHTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Up to four inches of rain fell in a 4 hour time period causing flash flooding.  Numerous roads were flooded in the southwestern portions of Macoupin County.  One motorist had to be rescued from 4 feet of water at the Railroad overpass along Illinois Route 16 at Shipman.