SPM NEWS 2.15.21 - 4:31PM Siouxland is under a Wind Chill Warning until Tuesday morning at 9 a.m. The National Weather Service says expect dangerously cold wind chills of up to 40-below overnight. Last night’s weather set records across the region. Sioux City did as well, with a low temperature of -28. Nebraska also saw a number of low-temperature records broken and expected more to fall Tuesday — as a polar vortex pushed Arctic air into the Plains. Temperatures are expected to be below normal for almost a week. Frigid weather that has sent temperatures plunging across Middle America also has power and gas utilities urging customers to dial down the thermostat through Wednesday. Utility companies serving Nebraska, Iowa, Kansas and Missouri issued the plea yesterday and today for customers to conserve power as temperatures dropped to nearly 30 below in parts of western and northern Nebraska early Monday, sending the wind chill to as low as nearly 50 below in some places.