A series of disturbances tracking along a nearly stationary frontal boundary resulted in two periods of heavy rainfall across parts of central Illinois on June 25th and June 26th.  The hardest hit areas were across southern McLean County into far northern Logan County, as well as across southern portions of Scott and Morgan counties.  The first wave of heavy rain began around 7pm CDT June 25th and persisted until around 11pm that evening before tapering off.  Rainfall amounts across southern McLean County ranged from 4 to 7 inches in 4 hours, with the heaviest rain extending from near the town of McLean through Bloomington-Normal southeastward toward LeRoy.  The second wave of heavy rain occurred during the afternoon of June 26th when additional amounts of 2 to 4 inches fell across the same areas of southern McLean County that had been impacted the previous evening.  Storm total rainfall between 6pm CDT June 25th and 6pm CDT June 26th ranged from 6 to 11 inches across southern McLean County, with a maximum amount of 10.71 inches measured 1.5 miles east-southeast of Bloomington...which represented a 1,000-year rainfall (0.1 percent chance of occurring in any given year).  Locations from Funks Grove through Shirley to southern and eastern parts of Bloomington experienced a 500-year rainfall (0.2 percent chance of occurring in any given year).  Due to the tremendous amount of rainfall, significant flash flooding occurred across central and southern McLean County into far northern Logan County, including the city of Bloomington.  Numerous roads were closed due to high water, several water rescues needed to be performed due to stranded motorists, part of the I-55 shoulder collapsed near Kickapoo Creek, and Kickapoo Creek reached record levels and flooded several homes in Lawndale in far northern Logan County.

Flash Flood in SCOTT, ILLINOIS
From 25-JUN-21 22:00:00 to 26-JUN-21 02:00:00 (CST-6)
Location: NEELYS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several roads were flooded south of Winchester and a van was submerged in high water on Route 67 west of Manchester.

Flash Flood in MORGAN, ILLINOIS
From 25-JUN-21 22:00:00 to 26-JUN-21 02:00:00 (CST-6)
Location: MURRAYVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Route 267 at New Lake Road just south of Jacksonville and Route 104 near Franklin were both flooded and closed.  A car was submerged in high water on Route 67 northwest of Murrayville.

Flash Flood in LOGAN, ILLINOIS
From 25-JUN-21 22:30:00 to 26-JUN-21 01:45:00 (CST-6)
Location: EMDEN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Route 136 was flooded near Sugar Creek.  Several other roads were flooded in Atlanta and Lawndale.

Flash Flood in LOGAN, ILLINOIS
From 26-JUN-21 15:27:00 to 26-JUN-21 18:30:00 (CST-6)
Location: LAWNDALE
Flood cause: Heavy Rain
Property damage: 300.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Kickapoo Creek reached record levels, resulting in the flooding of several homes in Lawndale.  The basement walls of one house collapsed, destroying the structure.

Flash Flood in MCLEAN, ILLINOIS
From 26-JUN-21 15:27:00 to 26-JUN-21 18:30:00 (CST-6)
Location: YUTON
Flood cause: Heavy Rain
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several intersections in Bloomington were flooded.  Numerous cars were stranded in high water: however, no water rescues were reported.  I-74 near the Downs exit was flooded.

Flash Flood in MCLEAN, ILLINOIS
From 25-JUN-21 22:30:00 to 26-JUN-21 01:45:00 (CST-6)
Location: STANFORD
Flood cause: Heavy Rain
Property damage: 11.80M
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous roads were closed due to flood waters, including Route 136 between Heyworth and McLean.  Part of the I-55 shoulder collapsed near Kickapoo Creek southwest of Bloomington, prompting the closure of the interstate.  A dive team from Hudson was deployed to rescue a stranded motorist on I-55 southwest of Shirley.  Other vehicles were stranded by high water near mile marker 159 on I-55 near Bloomington, at exit 142 on I-74 near the Kickapoo Creek Bridge just west of Downs, and about 2 miles north of LeRoy.  A homeowner was stranded by high water surrounding their property a mile north of Heyworth. Nearly 1, 600 homes and 75 businesses were damaged by the flooding, including more than 200 structures that had major damage or were destroyed.