***Numerous Winter Storm Warnings and Advisories in Effect. Check www.weather.gov/gjt for details and the latest forecast.*** A winter storm will impact the area this afternoon through Friday evening with significant snowfall to the mountains and some valley locations. This will come in two waves: the first from a cold front and disturbance across the north that will allow snow to continue over mainly the northern and central mountains and some valleys in northwest flow. This front will slowly sag southward across northeast Utah and northwest Colorado this afternoon. The second disturbance will come from the west this evening into Friday bringing more snowfall to the central and southern mountains. Upwards of 10 to 20 inches of snow is expected for many mountain locations through Friday. As far as the valleys are concerned, snow will mix in with rain during the day with mainly rain in the lower central and southern valleys before changing to all snow this evening. T! he weather will remain unsettled through the weekend into early next week. (Please visit http://weather.gov/gjt for more information.)