The first storm of the season for northern Illinois and northwest Indiana left a nearly 300 mile wide swath of snow across portions of the Midwest. Over 16 inches of snow fell across far northern portions of Illinois. Snow began during the late afternoon hours of Friday, November 20th, and persisted through the late afternoon of Saturday, November 21st.
The official snowfall for Chicago was 11.2 inches observed at O'Hare International Airport.  The official snowfall in Rockford was 8.8 inches at the Chicago Rockford International Airport.
Other snowfall amounts include 4.7 inches at the NWS Chicago office in Romeoville, and 5.8 inches 3 miles southwest of Chicago Midway International Airport.
Some of the highest storm total snow reports include:  19.0 inches near Mundelein (Lake); 18.6 inches in Capron (Boone); 17.1 inches near Roscoe (Winnebago); 15.9 inches near Bull Valley (McHenry); 13.3 inches near St. Charles (Kane); 12.0 inches near Elk Grove Village (Cook); 11.1 inches near Elmhurst (DuPage); 10.5 inches near Byron (Ogle); 10.4 inches in Genoa (DeKalb); 8.0 inches in Dwight (Livingston); 7.4 inches near Dixon (Lee); 6.6 inches in Peotone (Will); 6.6 inches in LaSalle (LaSalle); and 6.3 inches in Bourbonnais (Kankakee).

Heavy Snow in WINNEBAGO, ILLINOIS
From 20-NOV-15 15:00:00 to 21-NOV-15 15:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Heavy Snow in BOONE, ILLINOIS
From 20-NOV-15 15:00:00 to 21-NOV-15 15:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Heavy Snow in LEE, ILLINOIS
From 20-NOV-15 15:00:00 to 21-NOV-15 15:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Heavy Snow in OGLE, ILLINOIS
From 20-NOV-15 15:00:00 to 21-NOV-15 15:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Heavy Snow in DE KALB, ILLINOIS
From 20-NOV-15 15:00:00 to 21-NOV-15 16:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy Snow in MCHENRY, ILLINOIS
From 20-NOV-15 16:00:00 to 21-NOV-15 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Heavy Snow in LAKE, ILLINOIS
From 20-NOV-15 16:00:00 to 21-NOV-15 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Heavy Snow in KANE, ILLINOIS
From 20-NOV-15 16:00:00 to 21-NOV-15 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Heavy Snow in DU PAGE, ILLINOIS
From 20-NOV-15 16:00:00 to 21-NOV-15 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Heavy Snow in COOK, ILLINOIS
From 20-NOV-15 16:00:00 to 21-NOV-15 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Heavy Snow in KENDALL, ILLINOIS
From 20-NOV-15 17:00:00 to 21-NOV-15 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Heavy Snow in WILL, ILLINOIS
From 20-NOV-15 17:00:00 to 21-NOV-15 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Heavy Snow in LA SALLE, ILLINOIS
From 20-NOV-15 19:00:00 to 21-NOV-15 16:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public