Great news from Cliff Mass:
Modified Arctic Air and Low Elevation Snow Later on Monday and Tuesday
There is a saying about waiting until you see the whites of their eyes before firing.... and a similar thing is true about forecasting cold and snow over the Northwest lowlands. The situation is so rare, the atmospheric configuration needed is so difficult to achieve, and the uncertainties in getting the ingredients together so uncertain, that a wise forecaster waits until the event is within 3-4 days before alarming the public.
Well, our meteorological foe is now cresting the hill and running towards us, so I need to make a call. Here it is.
During the weekend we will have a weak ridge of high pressure over us, bringing cool, sunny conditions: perfect for outdoor activities or catching up in your yard. Or hit the slopes at Mt. Baker, Crystal, or Mount Hood Meadows.
But by Monday morning at 4 AM, a sharp upper level trough will approach us, a trough that will bring upward motion, clouds, and precipitation. A trough that will drive cool air southward out of Canada.
Substantial snowfall in the next couple of days - today and Sunday will be nice and clear.
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