A weaker winter storm moved into the area and added more ice and snow to the snow pack received the other day. This system moved in from the south and brought along a strong pull of warm air aloft. This led to a lot more ice accumulation than was expected prior to the event. While the storm was supposed to lead to mostly snow for the northern half of our forecast area, those areas received mainly freezing rain and sleet through most of the afternoon. This led to widespread ice accumulations of 0.10-0.25.  This resulted in some downed tree limbs and power outages were a result.
Mid afternoon, the freezing rain began to switch to snow from a line around Iowa City, IA to Freeport, IL. Another band of snow set up just east of the Mississippi, where reports around 3 were noted in the Moline area. Overall, these were relatively light snowfall accumulations with most locations in northwest Illinois seeing 1 to 3 inches.

Winter Storm in MCDONOUGH, ILLINOIS
From 01-JAN-21 06:00:00 to 01-JAN-21 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Freezing rain reports ranged from 0.2 inches at Industry to 0.3 inches 1 mile northwest of Macomb. The trained spotter in Industry also reported 1.0 inches of snow.

Winter Storm in HANCOCK, ILLINOIS
From 01-JAN-21 06:00:00 to 01-JAN-21 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer in Augusta reported  2.0 inches of sleet and snow in Augusta along with 0.2 inches of freezing rain. The COOP observer in La Harpe reported 2.2 inches of snow, sleet, and ice. Trained spotter reports in the Carthage area were 0.1 to 0.2 inches of freezing rain.

Winter Storm in HENDERSON, ILLINOIS
From 01-JAN-21 06:00:00 to 01-JAN-21 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at the Gladstone Lock and Dam reported 3.0 inches of snow and sleet.  There was also a public report of 0.2 inches of freezing rain in Oquawka.

Winter Storm in WARREN, ILLINOIS
From 01-JAN-21 06:00:00 to 01-JAN-21 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observers near Monmouth reported a glaze of ice and 2.3 inches of snow. A trained spotter a glaze of freezing rain.

Winter Storm in MERCER, ILLINOIS
From 01-JAN-21 06:00:00 to 01-JAN-21 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer in Aledo reported 2.0 inches of snow and sleet with a glaze of ice (0.05 inches) underneath.

Winter Storm in HENRY, ILLINOIS
From 01-JAN-21 08:00:00 to 02-JAN-21 00:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

An NWS employee reported about a tenth of an inch of freezing rain and 3 tenths of an inch of sleet in Geneseo. A trained spotter also reported a tenth of an inch of freezing rain in Cambridge.  COOP observer reports ranged from 0.3 inches of snow and sleet in Galva to 2.5 inches in Geneseo.

Winter Weather in ROCK ISLAND, ILLINOIS
From 01-JAN-21 08:00:00 to 01-JAN-21 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The official NWS observation for the Moline-Quad Cities Airport was 3.7 inches along with a tenth of an inch of freezing rain.

Winter Weather in BUREAU, ILLINOIS
From 01-JAN-21 08:00:00 to 02-JAN-21 00:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer in Princeton reported 2.5 inches of snow, sleet and a glaze of ice.

Winter Weather in BUREAU, ILLINOIS
From 01-JAN-21 08:00:00 to 02-JAN-21 00:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer in Princeton reported 2.0 inches of snow and sleet. There was also a public reported of a little more than a tenth of an inch of freezing rain in Putnam.

Winter Weather in WHITESIDE, ILLINOIS
From 01-JAN-21 08:00:00 to 01-JAN-21 21:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer reports of snow and sleet ranged from 1.0 inches in Rock Falls to 2.0 inches in Prophetstown.

Winter Weather in CARROLL, ILLINOIS
From 01-JAN-21 09:00:00 to 01-JAN-21 22:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter freezing rain reports ranged from 0.10 in Milledgeville to 0.2 inches near Mount Carroll. A trained spotter also reported 1.3 inches of snow and sleet in Milledgeville.

Winter Weather in STEPHENSON, ILLINOIS
From 01-JAN-21 10:00:00 to 01-JAN-21 23:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter report 0.2 inches of freezing rain 2 miles west northwest of Freeport.  A trained spotter in Freeport reported 2.0 inches if snow and sleet.