The front has swept past Longmont and skies are dark. (I’ll post this early, since the storm is underway). The current radar image sows western slope snows have begun (Figure 1).
Figure 2 by Wednesday evening, the front is far to the south with western slope snows almost making it down to Lyons! By Thursday a.m. (Figure 3) the front is far far to the south, but mountain snows and ‘plains’ snows are falling in just about every direction but not here in town. A dusting IS possible.
Figure 4 is a model used by astronomers that predicts snow around 11 p.m. Wednesday. The HRRR model, before 1 a.m. Thursday, puts 1-4 inches of snow down in the mountains, with snow almost making it down to Boulder, but not quite. Figure 6, the GFS, has snow south of Denver and up in the mountains from this storm, but nothing right in our town. My dusting to a coating of snow is still possible.
The longer range forecast:
We warm right up to the 50’s F and winds die down after Thursday. Very quiet weather will be the rule through Dec 22nd. That is VERY close to Christmas.