Arctic air plunged southeast across eastern Nebraska and southwest Iowa on January 14th and 15th.  Temperatures in southwest Iowa fell into the single digits during the morning hours of 1/14, recovered a little in the afternoon and then fell to 5 below to 20 below, or a bit colder, by the morning of the 15th.  Northwest winds of 20 to 30 mph with higher gusts were observed into the afternoon of the 14th before subsiding in the afternoon and evening.  This produced wind chill values of 20 below to 30 below zero over much of the region.  Winds continued to decrease during the early morning hours of 1/15, and by 5am CST most recorded speeds were less than 10 mph.

Cold/Wind Chill in MONONA, IOWA
From 14-JAN-09 06:00:00 to 14-JAN-09 23:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

As temperatures fell to around zero during the morning of 1/14 and then below zero by the evening of the 14th, northwest winds of 20 to 30 mph in the morning and early afternoon and 10 to 20 mph from late afternoon into late evening, produced wind chill values of 20 below to 30 below zero.  Winds dropped mostly below 10 mph by the early morning hours of 1/15 but air temperatures fell to 10 below to 20 below zero.

Cold/Wind Chill in HARRISON, IOWA
From 14-JAN-09 08:00:00 to 15-JAN-09 04:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

As temperatures fell to the single digits during the morning of 1/14 and then below zero by the evening of the 14th, northwest winds of 20 to 30 mph in the morning and early afternoon and 10 to 20 mph from late afternoon into late evening, produced wind chill values of 20 below to 30 below zero.  Winds dropped mostly below 10 mph during the early morning hours of 1/15 but air temperatures fell to 10 below to 20 below zero.

Cold/Wind Chill in PAGE, IOWA
From 14-JAN-09 21:00:00 to 15-JAN-09 05:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

As temperatures fell below zero by the evening of the 14th, northwest winds of 10 to 20 mph produced wind chill values of 20 below to 25 below zero.  Winds dropped mostly below 10 mph during the early morning hours of 1/15 but air temperatures by that time were around 10 below zero.

Cold/Wind Chill in MILLS, IOWA
From 14-JAN-09 23:00:00 to 15-JAN-09 05:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

As temperatures fell below zero by the evening of the 14th, northwest winds of 10 to 15 mph produced wind chill values of 20 below to 25 below zero.  Winds dropped mostly below 10 mph during the early morning hours of 1/15 but air temperatures by that time were around 10 below zero.

Cold/Wind Chill in FREMONT, IOWA
From 14-JAN-09 23:00:00 to 15-JAN-09 05:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

As temperatures fell below zero by the evening of the 14th, northwest winds of 10 to 15 mph produced wind chill values of 20 below to 25 below zero.  Winds dropped mostly below 10 mph during the early morning hours of 1/15 but air temperatures by that time were around 10 below zero.

Cold/Wind Chill in SHELBY, IOWA
From 14-JAN-09 21:00:00 to 15-JAN-09 05:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

As temperatures fell below zero by the evening of the 14th, northwest winds of 10 to 20 mph produced wind chill values of 20 below to 25 below zero.  Winds dropped mostly below 10 mph during the early morning hours of 1/15 but air temperatures by that time were around 10 below to 20 below zero.

Cold/Wind Chill in POTTAWATTAMIE, IOWA
From 14-JAN-09 21:00:00 to 15-JAN-09 05:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

As temperatures fell below zero by the evening of the 14th, northwest winds of 10 to 20 mph produced wind chill values of 20 below to 25 below zero.  Winds dropped mostly below 10 mph during the early morning hours of 1/15 but air temperatures by that time were around 10 below to 20 below zero.

Cold/Wind Chill in MONTGOMERY, IOWA
From 14-JAN-09 21:00:00 to 15-JAN-09 05:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

As temperatures fell below zero by the evening of the 14th, northwest winds of 10 to 20 mph produced wind chill values of 20 below to 25 below zero.  Winds dropped mostly below 10 mph during the early morning hours of 1/15 but air temperatures by that time were around 10 below to 15 below zero.