According to AccuWeather meteorologists, the northern Pacific region will remain active with storms bringing drenching rain and mountain snow to the northwestern United States starting this weekend. These storms will enhance the snowpack in the Cascades, Olympics, Siskiyous, and northern Sierra Nevada.
A powerful storm is expected to impact Washington and southern British Columbia this weekend. The bulk of the rain and mountain snow is forecast for Saturday, driven by a minor atmospheric river. Rainfall amounts between 0.75 to 1.50 inches are likely along the Interstate 5 corridor, with heavier amounts along the coasts and lower west-facing slopes.
In the Cascades and Olympics, 1 to 3 feet of snow is forecast through Saturday evening, leading to difficult travel conditions over mountain passes. Snowfall totals at Stevens and Snoqualmie Passes could reach between 8 to 20 inches by Sunday evening. Inland areas such as the Clearwater, Bitterroot, and Blue ranges may see 6 to 12 inches of snow.
Snow levels are expected to rise from Sunday to Monday. Total rainfall in some areas could approach 4 inches from Friday to early Monday. Periods of rain and snow are expected in lower elevations from east of the Cascades to the Snake River Basin until early next week.
Following a break from storms from Monday to Wednesday, sunshine and warmer temperatures could lead to snowmelt at higher elevations, potentially causing rockslides and elevated avalanche risks. By late next week, a new storm system will approach, bringing more rain and snow to the region.
Rainfall has been below average in Seattle and Tacoma since December 1, while Portland, Eugene, and Vancouver have seen near-average rainfall.
On average, The Dalles and Medford in Oregon, as well as Spokane in Washington, experience different levels of precipitation. Seattle typically receives approximately 18 inches of rain between December and March 20, while Medford usually sees around 9.40 inches during the same period. There are no significant predictions of rain or snow reaching Southern California in the upcoming week. For advanced safety features and an ad-free experience, consider subscribing to Premium+ on the AccuWeather app to access hyperlocal severe weather alerts provided by expert meteorologists who work around the clock to keep you and your loved ones safe.
