Over the weekend, many Denver-area residents woke up to find the world blanketed in what may have looked like snow or dense frost — and for some, that frost may have had large crystals jutting out at every angle.

An arctic blast will bring temperatures 20 to 40 degrees below average and a chance for snow. An arctic front will arrive Friday evening bringing a surge of cold air and a shift in the winds. Denver is looking at a 72+ hour period beginning Saturday with temperatures in the single digits (maybe some low teens if we are lucky) and below 0 degrees.