Sioux Falls, S.D. (KELO-AM) - The National Weather Service says arctic air will remain entrenched across much of the Northern Plains through Sunday night. As a result, wind chill advisories are in effect throughout the area. Dangerous wind chill values of 20 to 30 below zero will be common overnight into Sunday morning. Under clear skies tonight, low temperatures will plunge into the minus 10 to minus 15 range by daybreak. Stay safe and stay indoors if possible!!