Warm air spread across the area along with heavy rain and thunderstorms during the early morning of February 22nd.  Some of the thunderstorms produced small hail.  A cold front then moved into northern Illinois bringing freezing rain to far northern Illinois.  The heavy rain caused localized flooding.
Ice accumulation amounts from the freezing rain included 0.15 inches in Woodstock; 0.10 inches at McCullom Lake, Towers Lake, near Lakewood and three miles northeast of Woodstock; 0.09 inches at Waukegan Airport; 0.05 inches at Rockford Airport and 0.01 inches at Chicago Executive Airport.

Winter Weather in WINNEBAGO, ILLINOIS
From 22-FEB-22 06:00:00 to 22-FEB-22 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Winter Weather in BOONE, ILLINOIS
From 22-FEB-22 06:00:00 to 22-FEB-22 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in MCHENRY, ILLINOIS
From 22-FEB-22 06:00:00 to 22-FEB-22 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in LAKE, ILLINOIS
From 22-FEB-22 06:00:00 to 22-FEB-22 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Winter Weather in OGLE, ILLINOIS
From 22-FEB-22 07:00:00 to 22-FEB-22 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in DE KALB, ILLINOIS
From 22-FEB-22 07:00:00 to 22-FEB-22 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in KANE, ILLINOIS
From 22-FEB-22 07:00:00 to 22-FEB-22 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in NORTHERN COOK COUNTY, ILLINOIS
From 22-FEB-22 09:00:00 to 22-FEB-22 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Winter Weather in DU PAGE, ILLINOIS
From 22-FEB-22 11:00:00 to 22-FEB-22 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash Flood in WILL, ILLINOIS
From 22-FEB-22 09:00:00 to 22-FEB-22 14:00:00 (CST-6)
Location: WILMINGTON
Flood cause: Ice Jam
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

An ice jam formed on the Kankakee River near the Interstate 55 bridge. This ice jam caused localized flash flooding affecting yards and roads in the Phelan Acres subdivision.

Hail in KANE, ILLINOIS
From 22-FEB-22 06:01:00 to 22-FEB-22 06:02:00 (CST-6)
Location: ELGIN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Hail in COOK, ILLINOIS
From 22-FEB-22 06:17:00 to 22-FEB-22 06:18:00 (CST-6)
Location: BARRINGTON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Hail in KANE, ILLINOIS
From 22-FEB-22 05:44:00 to 22-FEB-22 05:45:00 (CST-6)
Location: ELBURN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Flood in KENDALL, ILLINOIS
From 22-FEB-22 12:45:00 to 22-FEB-22 17:00:00 (CST-6)
Location: MILLBROOK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Ditches were reported overflowing near River Road just west of Yorkville.  Minor overbank flooding was reported along Hollenback Creek near Millbrook.

Flood in LA SALLE, ILLINOIS
From 22-FEB-22 10:50:00 to 22-FEB-22 17:00:00 (CST-6)
Location: NAPLATE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Ditches and farm fields were flooded north of Grand Ridge.

Flood in WILL, ILLINOIS
From 22-FEB-22 13:15:00 to 22-FEB-22 18:00:00 (CST-6)
Location: (LOT) LEWIS UNIVERSITY AIRPORT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Ditches and fields were flooded near the National Weather Service office in Romeoville.