After a relatively mild winter day Sunday, a low pressure system sweeping in from Canada and the Dakotas ushered in an arctic air mass.  The cold front began its entry into Iowa around 6pm CST Sunday and quickly moved across Iowa by about 3am CST Monday.  Behind the front were gusty northwest winds, with gusts approaching 40 mph at times.  Temperatures also fell quickly from the low to mid 20s ahead of the front to the single digits and single digits below zero just a couple hours later.  The result was a long duration event with wind chills well below zero.  Northern areas experienced wind chill values of -25 degrees F or less for 24 hours or more, while southern areas saw said wind chills for around 10 hours.  The worst time frame for wind chills were from roughly 6am on the 15th through 6am on the 16th.

Extreme Cold/Wind Chill in WEBSTER, IOWA
From 15-JAN-18 12:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in HAMILTON, IOWA
From 15-JAN-18 12:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in HARDIN, IOWA
From 15-JAN-18 12:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in AUDUBON, IOWA
From 16-JAN-18 02:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in GUTHRIE, IOWA
From 16-JAN-18 02:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in DALLAS, IOWA
From 16-JAN-18 02:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in CASS, IOWA
From 16-JAN-18 02:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in ADAIR, IOWA
From 16-JAN-18 02:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in MADISON, IOWA
From 16-JAN-18 02:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in ADAMS, IOWA
From 16-JAN-18 02:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in UNION, IOWA
From 16-JAN-18 02:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in TAYLOR, IOWA
From 16-JAN-18 02:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in RINGGOLD, IOWA
From 16-JAN-18 02:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in CRAWFORD, IOWA
From 15-JAN-18 22:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in CARROLL, IOWA
From 15-JAN-18 22:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in GREENE, IOWA
From 15-JAN-18 22:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in BOONE, IOWA
From 15-JAN-18 22:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in STORY, IOWA
From 15-JAN-18 22:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Extreme Cold/Wind Chill in EMMET, IOWA
From 15-JAN-18 09:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Extreme Cold/Wind Chill in WRIGHT, IOWA
From 15-JAN-18 12:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in KOSSUTH, IOWA
From 15-JAN-18 12:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in WINNEBAGO, IOWA
From 15-JAN-18 12:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in WORTH, IOWA
From 15-JAN-18 12:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in CERRO GORDO, IOWA
From 15-JAN-18 12:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Extreme Cold/Wind Chill in HANCOCK, IOWA
From 15-JAN-18 12:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in PALO ALTO, IOWA
From 15-JAN-18 12:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in POCAHONTAS, IOWA
From 15-JAN-18 12:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in HUMBOLDT, IOWA
From 15-JAN-18 12:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in FRANKLIN, IOWA
From 15-JAN-18 12:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in SAC, IOWA
From 15-JAN-18 12:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Extreme Cold/Wind Chill in CALHOUN, IOWA
From 15-JAN-18 12:00:00 to 16-JAN-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS