In Seattle, a few inches of snow inspire words like "snowpocalypse." But just up the road, Mount Baker holds the world record for most snowfall in one year. Cliff Mass, the weather man on KUOW's "Weekday," explains what makes it snow in Western Washington.
Basically, for snow, we need COLD and MOIST air.
For the Puget Sound area, if the air mass comes from the west (normal) or the south, it will be warm.
If the air mass comes from the east or north east, it will be cold, but because of the mountains and the Rain Shadow Effect, it will be DRY.
When we do get a good snow storm, it's usually because of cold air coming down the Fraser River Valley in British Columbia.
(Above: Fraser River Valley)