Snowfall Possible with Cold Temperatures as Northwesterly Flow Reaches the North

Bryan Dijkhuizen

From now till Thursday, you may. A north to northwesterly flow pattern will dominate the atmosphere for most of the week as an upper-level low-pressure system over central Canada seeks to swing a pair of systems our way, bringing the possibility of widespread snow in the wake of persistently frigid temperatures.

Snow has been light and sporadic at and along with the Blues throughout most of the day, and it is expected to halt completely by the early evening before a frontal boundary reaches the forecast region over the late hours and into Wednesday.

Considering the frigid temperatures and lack of moisture associated with this front, it won't take much to create significant snowfall accumulations, especially given the high snow-to-rain ratios expected. a Winter Weather Advisory is in effect for the lower Basin and foothills of the Blues, with 1-3 inches of precipitation forecast primarily south of the Tri-Cities, with the highest amounts concentrated along and within the Blues, where upslope enhancement will favor accumulations of 3+ inches or more.

Up to 1-1.5 inches of rain might fall elsewhere, with lesser amounts forecast northward up into the Washington Cascades and nearby foothills/valleys, where less than an inch is expected overnight tonight and tomorrow.

During the day on Wednesday, a strong northerly flow will accompany this storm, allowing for some clearing as well as the lowest temperatures of the week continuing into the morning of Thursday.

Many locations might see temperatures in the single digits, with high valleys at danger of falling below zero. Later in the day on Thursday, a more structured streak of northwest flow will funnel in, allowing for another bout of snowfall throughout the forecast region.

As snow right now, the Blue Mountains seem to have the biggest accumulations, with smaller amounts in the Cascades, but both are sure to be newsworthy. It's possible to observe a couple of inches of snow around the foothills of the Blue Mountains, with some accumulations spreading into the Lower Basin.

We'll hold off on sending out messages for this system for the time being due to the system that passed through tonight, but greater odds for widespread snowfall seem to be on Thursday.

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