An Arctic cold front moved rapidly southeast across the lower Ohio Valley on the evening of the 11th. Rain changed to a brief period of freezing rain, then to sleet during the overnight hours. The sleet changed to snow on the 12th as the Arctic air flooded in. In the Ohio and Wabash River counties, a vigorous disturbance in the upper levels of the atmosphere prolonged the snow through much of the day on the 12th. Total accumulations of sleet were from one-half to one inch in most areas. Freezing rain produced a thin layer of glaze under the sleet and snow. On top of the sleet, snow accumulated from 2 to 4 inches along and southeast of a line from Mount Carmel to Harrisburg and Vienna. Following the changeover to snow, visibility was reduced to one-quarter mile at times in the Ohio and Wabash Valley counties, where peak snowfall rates were near one-half inch per hour. The lowest snow and sleet accumulations were along and northwest of a line from Mount Vernon to Du Quoin, where accumulations were mainly less than one-half inch. Strong north winds frequently gusted to 35 mph, producing wind chills near zero at times. Very cold temperatures in the wake of the storm reduced the effectiveness of melting agents such as salt. Dangerous travel conditions persisted well after the ending of the precipitation. Some vehicle accidents were reported, mainly where the heaviest snow fell in southeast Illinois.

Winter Storm in ALEXANDER, ILLINOIS
From 12-JAN-18 00:00:00 to 12-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in EDWARDS, ILLINOIS
From 11-JAN-18 22:00:00 to 12-JAN-18 16:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in FRANKLIN, ILLINOIS
From 11-JAN-18 22:00:00 to 12-JAN-18 09:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in GALLATIN, ILLINOIS
From 12-JAN-18 00:00:00 to 12-JAN-18 16:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in HAMILTON, ILLINOIS
From 11-JAN-18 22:00:00 to 12-JAN-18 13:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in HARDIN, ILLINOIS
From 12-JAN-18 01:00:00 to 12-JAN-18 16:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in JACKSON, ILLINOIS
From 11-JAN-18 22:00:00 to 12-JAN-18 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in JOHNSON, ILLINOIS
From 12-JAN-18 00:00:00 to 12-JAN-18 13:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in MASSAC, ILLINOIS
From 12-JAN-18 01:00:00 to 12-JAN-18 16:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in POPE, ILLINOIS
From 12-JAN-18 00:00:00 to 12-JAN-18 15:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in PULASKI, ILLINOIS
From 12-JAN-18 00:00:00 to 12-JAN-18 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in SALINE, ILLINOIS
From 11-JAN-18 23:00:00 to 12-JAN-18 14:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in UNION, ILLINOIS
From 11-JAN-18 23:00:00 to 12-JAN-18 09:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in WABASH, ILLINOIS
From 11-JAN-18 22:00:00 to 12-JAN-18 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in WAYNE, ILLINOIS
From 11-JAN-18 21:00:00 to 12-JAN-18 13:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in WHITE, ILLINOIS
From 11-JAN-18 23:00:00 to 12-JAN-18 16:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in WILLIAMSON, ILLINOIS
From 11-JAN-18 23:00:00 to 12-JAN-18 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in JEFFERSON, ILLINOIS
From 11-JAN-18 21:00:00 to 12-JAN-18 09:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in PERRY, ILLINOIS
From 11-JAN-18 22:00:00 to 12-JAN-18 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter