Arctic surface high pressure of 1036 millibars was centered across much of western and central Nebraska, into western Kansas, on Tuesday morning, January 11th. With fresh snow cover from the recent snow storm - overnight low temperatures plummeted to readings well below zero at all automated airport sensor locations. The coldest locations were in the Platte River Valley, where cold air drainage allowed very cold air to slide into the region.
Below are the lowest temperatures recorded overnight at selected locations, along with the coldest wind chill indices reported through 730 AM CST.
With a drier airmass arriving aloft tonight, combining with the ample snowpack and good radiational cooling under mainly clear skies - temperatures will again plummet and range from 10 degrees below zero to 25 degrees below zero. The coldest temperatures tonight will be again be located across the Platte River Valley.
No records have yet been broken for minimum temperatures on January 11th. The record low temperature for Broken Bow on this date is -30 degrees in 1918, with Imperial reporting a record low temperature on this date of -27 degrees, also in 1918. The record low temperature for the 11th of January in Valentine is minus 32 degrees in 1918. For North Platte, the record low temperature on this date of minus 26 degrees was set on January 11th, 1892 - and may be in jeapordy before midnight as the drier airmass arrives.