Snow data from avalanche sites is showing heavy snow over Mount Baker this morning and up to 20 inches in the past 24 hours (15 overnight) with lesser amounts to the South. Moderate snow will continue over the Central and Southern Cascades today (5-10 inches) before moving into Central Idaho, and Northern Wyoming by Tuesday.
The Tetons will see snow during the day Tuesday (4-7 inches) into the evening as a sharp cold front lowers temperatures from a brief warm up today. The Wasatch will see a quick 6-7 inches from 9PM Tuesday to 4AM Wednesday. The Sierra will see a quick 2-4 inches over the next 24 hours especially over the Northern portions of the Mountain Ranges. Most of this snow will fall on hard crusted surfaces from record warm temperatures today so stick to North Facing slopes on Wednesday as the crust layer will be noticeable underneath!
Colorado: The cold front reaches Colorado Wednesday morning and will provide a quick 2-4 inches of snow over Aspen, Vail and Summit County during the day however higher amounts look likely over the San Juans especially over Wolf Creek Pass where steady light snow through Thursday is likely (5-10 inches). The deepest day to ski there will be Thursday morning. Monarch could spell well with this storm due to an upslope component (Easterly Flow) on Wednesday night! Most of the energy in Colorado drops South so areas near Eldora might not see much more than an inch!