A large upper level low pressure area developed across Kansas and lifted into Iowa by December 2. The leading edge of the system produced some light ice accumulations from southeast South Dakota into northwest Iowa on early Saturday morning. Heavy snow and wind developed during Saturday and Saturday evening, but snowfall was diminished quite a bit by downslope impacts in far northwest Iowa.

Winter Storm in CHEROKEE, IOWA
From 01-DEC-18 08:00:00 to 02-DEC-18 09:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

After a brief period of freezing rain which produced a glaze of light icing during the early morning of December 1, heavy snow occurred for numerous hours. Accumulations over less than a 24-hour period totaled 8.0 inches at Cherokee and 7.2 inches at Washta. Treacherous travel resulted as winds gusted to 30 to 35 mph and combined with snowfall to produce several hours of visibility of a half mile or less centered around 1200CST.

Winter Storm in CLAY, IOWA
From 01-DEC-18 06:00:00 to 02-DEC-18 12:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

After a brief period of freezing rain which produced up to 0.2 inch of icing during the early morning of December 1, heavy snow occurred for numerous hours. Accumulations over less than a 24-hour period totaled 7.0 inches at Spencer and 6.5 inches three miles west-northwest of Everly. Treacherous travel resulted as winds gusted to 40 to 50 mph and combined with snowfall to produce visibility of a half mile or less at times between 1100-1600CST.

Winter Storm in DICKINSON, IOWA
From 01-DEC-18 08:00:00 to 02-DEC-18 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

After a brief period of freezing rain which produced up to 0.1 inch of light icing during the early morning of December 1, heavy snow occurred for numerous hours. Accumulations over less than a 24-hour period totaled 6.9 inches at Spirit Lake and four miles northwest of Milford. Treacherous travel resulted as winds gusted to 40 to 50 mph and combined with snowfall to produce visibility of a half mile or less at times between 1100-1600CST.

Winter Storm in O'BRIEN, IOWA
From 01-DEC-18 04:00:00 to 02-DEC-18 10:00:00 (CST-6)
Property damage: 7.00K
Crop damage: 0.00K
Reported by: COOP Observer

After a brief period of freezing rain which produced a glaze of light icing during the early morning of December 1, heavy snow occurred for numerous hours. Accumulations over less than a 24-hour period totaled 7.5 inches at Sanborn and 5.9 inches at Primghar. Treacherous travel resulted as winds gusted to 35 to 45 mph and combined with snowfall to produce several hours of visibility of a half mile or less between 1200-1800CST. A semi-truck jackknifed and went into the ditch along U.S. Highway 59 near Primghar around 1500CST.

Winter Storm in PLYMOUTH, IOWA
From 01-DEC-18 08:00:00 to 02-DEC-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

After a brief period of freezing rain which produced a glaze of light icing during the early morning of December 1, heavy snow occurred for numerous hours. Accumulations over less than a 24-hour period totaled 6.6 inches at Akron, 6.5 inches at Remsen and 6.0 inches six miles west-southwest of Hinton. Treacherous travel resulted as winds gusted to 30 to 40 mph and combined with snowfall to produce visibility of a half mile or less at times between 1000-1600CST.

Winter Storm in SIOUX, IOWA
From 01-DEC-18 07:00:00 to 02-DEC-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

After a brief period of freezing rain which produced a glaze of light icing during the early morning of December 1, heavy snow occurred for numerous hours. Accumulation totaled 6.0 inches at Hawarden. Treacherous travel resulted as winds gusted to 30 to 40 mph and combined with snowfall to produce visibility of a half mile or less at times between 1000-1600CST.

Winter Storm in OSCEOLA, IOWA
From 01-DEC-18 04:00:00 to 02-DEC-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

After a brief period of freezing rain which produced a glaze of light icing during the early morning of December 1, heavy snow occurred for numerous hours. Accumulations over less than a 24-hour period totaled 9.0 inches at Ashton. Treacherous travel resulted as winds gusted to 35 to 45 mph and combined with snowfall to produce several hours of visibility of a half mile or less between 1200-1800CST.