A new weather system is expected to enter the Rocky Mountain region Monday...pushing a surface cold front southward through Colorado by evening. Timing of the front should allow temperatures to warm to Sunday's readings or higher...before cooler air starts to spill through the area late in the day. Rain and snow showers are possible most of the day over the mountains...while the region's lower elevations will likely see precipitation delayed until the frontal passage in the afternoon and evening.   (Please visit http://weather.gov/pub for more information.)