A large, cold area of high pressure currently centered over southern Alberta will slowly slide down the east side of the Rocky Mountains over the next day pushing much colder air in northeastern Colorado:
As this cold, moist airmass spreads into northeastern Colorado, a variety of precipitation will occur over the Northeastern Plains and the Front Range Foothills. Initially on Wednesday morning, freezing drizzle will be falling, particularly in the lower foothills east of the Peak-to-Peak Highway. The cold airmass will be too shallow and warm to support the growth of snowflakes. Instead, the supersaturated lower atmosphere will produce supercooled droplets that will fall as drizzle.
The higher Foothills and Front Range Mountains will likely still be above this cold air mass early on Wednesday. If you are heading up to Brainard Lake, it will likely be sunnier and warmer there on Wednesday morning, than it will be in Boulder. The roads in the lower Foothills will be slick, though.
As the day progresses, the cold airmass banked up against the eastern slope of the Front Range Mountains will deepen, the top of which possibly reaching 10000 feet in the afternoon. Light snow will be likely, especially in the lower Foothills and the adjacent Plains. Nederland may see some flurries, but normally in these scenarios, the steadier snow stays east of town.
Aside from the freezing drizzle and light snow, temperatures will be chilly. Temps will start the day in the low 20s F and drop back into the teens during the day.
The next weather maker this week will be an upper-level shortwave that will approach the Central Rockies on Friday:
As this system approaches on Friday, winds should shift from the north/northeast establishing weak upslope and light snow in the Front Range Foothills. This is not expected to be a big storm, but several inches of snow will be possible in and around Nederland Friday afternoon and evening.
After a warm start, temperatures the remainder of this week will remain at seasonably cool levels:
