The weather pattern will remain quite active for the Northwest and disturbances continue to slam into the region. The weather midweek will be no different with more rain and snow ahead. We’re tracking a quite potent upper-level disturbance that will take a southward dive from the Gulf of Alaska all the way into the Northwest US before stalling over the Southwest US.
The weather on Tuesday will remain quiet across the region, although rain showers will likely sneak into northwestern Washington, including Seattle, by the evening. It’s not until overnight when the activity ramps up, as the disturbance plows in. A light to moderate rain will move southward into the Washington and Oregon coasts as the night progresses while heavy snow infiltrates much of the Cascades. Light snow will also be present in eastern Washington, northeast Oregon, the tip of Idaho, and the Bitterroots of Montana.
This weather will persist into our Wednesday. Rain showers can be expected at times across the Northwest coast into northwest California. Also as warmer temperatures ooze into the lower elevations, rain instead of snow is forecast for portions of interior Washington and Oregon as well as in the valleys of Idaho. Now where the air will be cold enough for snow, it will be coming down at an intense clip for some locations, specifically in the Cascades and the Rockies of Idaho. Lighter snow is expected across western Montana and portions of Oregon, California, and Nevada.
Now overnight Wednesday, ‘Disturbance 1,’ which is responsible for all the weather in the Northwest, will meet up with a second disturbance (Disturbance 2) over the Southwest, and the first one will basically absorb the second one. This will therefore bring snow and rain showers to portions of the Southwest as well. Now in the Northwest and the intermountain West, light snow is expected to fall across much of the interior Northwest and down into the Colorado Rockies and portions of Utah and Arizona. Light snow will also overspread across the remainder of Montana and into parts of the Northern Plains associated with a separate disturbance (Disturbance 3).
On Thursday, the activity will begin to diminish, although snow is still forecast in portions of Colorado and Utah while light snow falls from Wyoming through the Upper Midwest associated with that different disturbance.
Snowfall totals through Thursday will be heavy in some locations. Around a foot of snow is forecast in the Cascades and portions of the Rocky Mountains, including in northern Idaho and eastern Utah, while western Colorado receives up to two feet. Otherwise in the lower elevations where snow is forecast, up to two inches is forecast.