Martin Luther King Day started mild but it won't finish that way.
After temperatures slip to nearly 50 degrees, a cold front arrives tonight to deliver significant changes. Snow begins late this evening and lasts most of the night, leaving us with one to two inches from St. Louis east and a dusting, to an inch for areas to the west.
Blowing that snow around will be winds pushing along at 20 to 30 miles per hour which, combined with temperatures falling to near 20 by sunrise, will produce wind chills of -5 to -10.
Morning flurries Tuesday will give way to fair skies but temperatures will stay in the teens and wind chills will remain below zero.
It gets a bit warmer Wednesday, but Thursday will bring another surge of cold air and highs in the teens.