Weather experts say the last 24 hours saw some of the coldest air Siouxland's seen in a year.
A mass of arctic air is crossing the upper Midwest. In Sioux City, temps are expected to drop to negative numbers, Monday night.
In northern Siouxland, the wind chill looks to be 20 to 30 below. Advisories are in effect until Tuesday morning, with the National Weather Service warning people prolonged exposure could result in frostbite, hypothermia, or death.
"Bundle up. Try to keep your extremities covered. The areas most prone to frost bite are your fingers, your nose, your ears. Limit your exposure to outside," said Jen Hacker, a NWS meteorologist.
As a precaution, Sioux City public schools are keeping elementary students inside until temps rise.
"We look for the real feel temperature to be 15 degrees. If it's below 15 degrees, then the students are inside for lunch and recess," said Sioux City School's K-5 Education Director Brian Burnight.
It's a big change from Saturday, temps were near 50. The switch had folks going after Mother Nature on our Facebook page. Michelle Duckett said "It's still January after all." Tonya Dempster said "We were definitely spoiled until this morning."
About the only people happy with the lack of heat, were the folks at Kalins Indoor Comfort. Officials there say they've been busy all day.
"We probably took 35 calls or so. Those that wake up to a cold house are calling to get their furnace running again," said Kalins Service Manager Curt Brodsky.
Weather experts say temps will return to the 20's by Wednesday. Until then, stay warm.
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