SIOUX FALLS, S.D. (AP) — Residents of the Dakotas are used to cold winters, but temperatures and wind chills not seen in a decade have been moving into the area.
In Grand Forks, North Dakota an air temperature of -19 degrees and 18 mph winds drove the wind chill down to -46 on Sunday afternoon.
North Dakota Governor Jack Dalrymple has encouraged superintendents to use their discretion and make student safety a priority in deciding whether to close schools.
A wind chill warning is in effect through Tuesday morning.