An upper level low-pressure system can be seen on satellite loops heading towards the Pacific Northwest. This in turn is currently amplifying the ridge over the region, but also slowly pushing it inland. Currently there is a mid-level stratus deck in the Columbia basin west into the lower east slopes of the Cascades. That area had a tough time totally clearing out on Thursday and we can expect the same thing this afternoon. Chilly temperatures this morning will give way to highs from the mid-20s to mid-30s.
A weak wave of moisture will move through Northcentral Washington early Saturday morning until around noon with only a 20% chance of light snow possible, highs in the mid 30’s.
On Sunday, an active winter storm track will become established over the Pacific Northwest bringing a pair of storm systems through the region. The first will impact the region late Sunday afternoon into Monday followed by a second system on Tuesday and Wednesday. Expect a 70% chance of snow on Sunday and Sunday night with about an inch accumulation expected, highs in the mid 30’s. The main focus for snow on Sunday will be in the Cascades where several inches will be possible. This will likely impact travel across Stevens and Blewett Passes. There is just a slight chance for an early morning snow flurry on Monday with high temperatures warming up to around 40 degrees.
A second and more potent winter storm will pass through the region bringing widespread wintry weather and potential for gusty winds Tuesday and Tuesday night. Weather models are in good agreement of a widespread precipitation event. A leading warm front will spread into the Inland Northwest Tuesday with snow developing in the Cascades and Central WA late morning and expanding across Eastern Washington late in the day and into the evening. Widespread light snow will continue for a good portion of the evening and overnight hours before ending with the passage of a cold front around sunrise Wednesday. Rough forecast numbers suggest the potential for 2-4 inches of snow along and north of Highway 2. The mountains will stand a decent shot of 3-6 inches with much higher amounts on the Cascade Crest. We will see a 70% chance of snow on Tuesday and Tuesday night with around 2”-3” of snow expected, highs in the mid 30’s.
Isolated snow showers are in the forecast for Wednesday and Thursday next week with afternoon high temperatures in the upper 30’s.