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Arctic Cold Weather Midweek

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Chief Meteorologist Justin Stapleton‘s Daily Forecast Discussion: 

Big changes coming this week starting tonight with steady rain pushing through and winds picking up overnight as the cold front gets closer to Western Oregon heading into what will be a very chilly week overall this week. Rain will be steady most of the night and temperatures will hold steady (more or less) in the low 50s and upper 40s through early AM. Snow will be confined up above the Passes through midday Monday.

Rain will start to change over to snow at Pass level midday Monday and will accumulate anywhere from 4-8″ of snow through Tuesday morning. Snow levels will be dropping to around 3000 feet in the afternoon, down to around 1500 feet late Monday night. While the surrounding valley foothills may see an inch or so of snow, the moisture train is pretty much cut off by the time any snow flakes would make it to the valley floor. Our best shot is some quick snow bursts overnight Monday and Tuesday AM. Anything that does fall won’t stick long, nor accumulate to make a big deal.

What we’ll really notice is the cold nature of this Arctic airmass that will invade the Northwest midweek, highs will struggle to get into the mid 30s and overnight lows will fall into the 20s and likely teens by Wednesday and Thursday morning. The Egan Warming Centers have opened for Tuesday night and are on standby for the rest of the week.

By the weekend, just a tad warmer with highs back into the upper 30s but some weather models are trying to wrap a disturbance around the jetstream, pick up some moisture off the Pacific and move into Oregon Friday night and Saturday. If it pans out, that’s our best chance for seeing snow on the valley floor. We’ll be watching that scenario as it develops. Stay warm!

Have a great Monday!

- Chief Meteorologist Justin Stapleton

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