UPDATE: 11:40 a.m.:
Temperatures in the Midlands bottomed out in the single digits and wind chills reached between about 25 below and 30 degrees below zero early this morning.
Scott Dergan, meteorologist for the National Weather Service, provided the following list of morning lows. The wind chills are extrapolated, he said.
9 degrees below zero, Tekamah at 7:34 a.m., wind chill of 30 degrees below zero 6 degrees below zero, Norfolk at 8:15 a.m., wind chill of 25 degrees below zero 6 degrees below zero, Council Bluffs, wind chill of 26 degrees below zero 5 degrees below zero, Omaha at 7:54 a.m., wind chill of 26 below zero 5 degrees below zero, Lincoln at 8 a.m., wind chill of 24 degrees below zero 4 degrees below zero, Millard, wind chill of 26 degrees below zero 3 degrees below zero, Falls City at 8:22 a.m., wind chill of 22 degrees below zero.
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With a Thursday morning low around 5 degrees below zero and modest winds blowing, wind chills could be around 25 degrees below zero from about 5 to 9 a.m. East into Iowa, wind chills could reach 30 degrees below zero, said Becky Kern, meteorologist with the National Weather Service.
A wind chill warning was issued until noon Thursday for parts of southwest Iowa. Many rural schools there will be having late starts due to concern over wind chills that could drop to 25 below or lower.
The Omaha area will be under a wind chill advisory until 10 a.m. Thursday.
By the afternoon school bell and evening drive time, temperatures are forecast in the mid-teens with the wind chill slightly above zero, Kern said.
The threshold for school cancellations in the Omaha metro is sustained wind chills of 20 below to 30 degrees below zero. As of midday Wednesday, Omaha Public School officials didn't expect the cold to interfere with the school day.
On Friday, a high of 50 degrees is forecast.
The weekend is expected to be breezy, with highs around 40 degrees.