A Pacific northwest storm system will push through northern Colorado and southern Wyoming today.  Expect widespread snow across the state, beginning today and lasting through Christmas morning.  Snow showers over the southeast part of Wyoming will begin late this afternoon and into tonight.  Total accumulations by Christmas Day should range between about 1 and 3 inches.  Some low-level blowing snow is possible, but no significant winds are expected with this storm.  Temperatures will be very cold tonight, dropping into the single digits.  But temperatures through Christmas Day will be frigid, with highs staying in the teens and low 20's.