As one weather system departs the region this morning, another storm system arrives late tonight. This storm system has the potential to produce significant snow over the Colorado northwestern mountains from midnight tonight through Wednesday. Heavy wet snow is possible with accumulations of 15 to 25 inches with upwards to 30 inches. Elsewhere, mountain snow with valley rain showers are expected on Monday (except mostly dry far south). Very windy conditions will develop on Tuesday with intermittent showers. Much colder conditions are forecast on Wednesday with mountain snow showers likely.   (Please visit http://weather.gov/gjt for more information.)