Radar and observations (looking out the window) show snow showers have popped up the past few hours over the Willamette Valley. As of 11:45am they seem to be increasing in intensity. There is a weak surface area of low pressure of the coastline, and the arrival of colder air from the east overhead may be giving a little lift to the cloud cover. That’s the cloud cover that I thought would be gone by this morning. Here’s the view down in Salem, which seems to be getting some of the heavier showers:
Regardless, it’s a bit too warm during the daylight hours for snow to stick. Road surface temps in the metro area are around 40 degrees or so, and air temps are into the mid 30s. IF snow showers were to continue past sunset, then it’ll be plenty cold for snow to stick. But they should dissipate during the afternoon. We’ll see.
Two other things I notice this morning: Models have overdone the cold air banked up against the east side of the Cascades. The WRF-GFS showed 5,000′ temps around zero to +5 by this morning on the east side of the north Oregon Cascades. Instead it’s 13 and 12 at Timberline and Meadows. Oops… The other is that models obviously have overdone the cold air at the surface in general. Sure, it’s still a blast of arctic air the next few days, but high temps will probably end up in the lower 30s instead of 20s.
Chief Meteorologist Mark Nelsen