Very cold temperatures and moderate northwest winds combined to lower wind chill readings to 35 to 45 below zero at times from the morning of January 14th to early morning on January 15th. The strongest winds were at the start of the event. While winds decreased slowly on the night of January 14th, actual temperatures also dropped, reaching 20 below to 30 below zero near daybreak on January 15th, about which time winds became light and no longer a major factor.

Extreme Cold/Wind Chill in BROOKINGS, SOUTH DAKOTA
From 14-JAN-09 06:00:00 to 15-JAN-09 06:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Moderate to strong northwest winds and very cold air combined to lower wind chills to 35 to 45 below zero at times. The coldest winds chills were during the morning of January 14th with strong winds, and the night of January 14th to daybreak of January 15th when temperatures were falling and winds were slowly decreasing. The actual temperature dropped to 31 below zero at Brookings on the morning of January 15th after the wind had subsided.

Extreme Cold/Wind Chill in MOODY, SOUTH DAKOTA
From 14-JAN-09 18:00:00 to 15-JAN-09 06:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Moderate northwest winds and very cold air combined to lower wind chills to 35 to 45 below zero at times. While winds were slowly decreasing during this time period, temperatures were steadily dropping.

Extreme Cold/Wind Chill in LAKE, SOUTH DAKOTA
From 14-JAN-09 18:00:00 to 15-JAN-09 06:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Moderate northwest winds and very cold air combined to lower wind chills to 35 to 45 below zero at times. While winds were slowly decreasing during this time period, temperatures were steadily dropping.

Extreme Cold/Wind Chill in BEADLE, SOUTH DAKOTA
From 14-JAN-09 18:00:00 to 15-JAN-09 06:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Moderate northwest winds and very cold air combined to lower wind chills to 35 to 45 below zero at times. While winds were slowly decreasing during this time period, temperatures were steadily dropping.  The actual temperature dropped to 30 below zero at Huron on the morning of January 15th after the wind had subsided.

Extreme Cold/Wind Chill in KINGSBURY, SOUTH DAKOTA
From 14-JAN-09 18:00:00 to 15-JAN-09 06:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Moderate northwest winds and very cold air combined to lower wind chills to 35 to 45 below zero at times. While winds were slowly decreasing during this time period, temperatures were steadily dropping.

Extreme Cold/Wind Chill in MINNEHAHA, SOUTH DAKOTA
From 14-JAN-09 18:00:00 to 15-JAN-09 06:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Moderate northwest winds and very cold air combined to lower wind chills to 35 to 45 below zero at times. While winds were slowly decreasing during this time period, temperatures were steadily dropping.  The actual temperature dropped to 26 below zero at Sioux Falls on the morning of January 15th after the wind had subsided.