The forecast remains on track this afternoon with rain falling west of Puget Sound and windy conditions to the north. The line of heavier rainfall will move slowly southeast through the afternoon, and by 1–2 p.m., it will be raining—heavily in some areas—across the northern waters, northwest interior (north and west of Everett), the Strait, and the coast.
A Wind Advisory is in effect for the north coast and northwest interior through Friday evening, where gusts on the water could reach 40–45 mph.
Rain will begin around the Everett-Seattle-Tacoma areas between 3–4 p.m., right as trick-or-treaters are heading out. Expect a wet Halloween evening with standing water and blustery conditions, including gusts over 20 mph around the metro area and slightly stronger winds to the north.
Rain will continue to increase through the later evening hours, raising the potential for urban flooding due to leaf-clogged storm drains. A quarter to a half inch of rain is expected around Puget Sound through the evening, with higher totals across the north and along the coast.
There may be a brief break overnight into early Saturday before a second system brings another round of heavy rain before daybreak. That system will linger through much of Saturday morning before moving into the Cascades by afternoon.
A period of stronger winds, with gusts between 35–45 mph, is possible Saturday morning into early afternoon as a compact low-pressure system moves onshore. While this system is not expected to be as strong as last weekend’s storm, minor impacts are possible. However, trees are less vulnerable this time since last weekend’s winds already cleared many leaves and weakened branches.
After the heavier rain tapers off early Saturday afternoon, a Puget Sound Convergence Zone will likely develop, bringing lingering showers across the central and north Sound. Snow levels, which have been above 7,000 feet during the atmospheric river event, will drop to 3,500–4,000 feet late Saturday into Sunday, allowing for a few inches of snow over higher mountain passes.
Rainfall totals from Friday through Saturday are expected to range between 0.75–1.25 inches across most lowland areas, with heavier amounts at the coast and to the north. The mountains could receive 2–4 inches or more, which may push some rivers higher through the weekend.
The Skokomish River in Mason County could reach minor flood stage for the first time this season during and after the atmospheric river event. This type of flooding is common, and while property and travel impacts are expected to be minimal, salmon could once again be seen crossing roadways near Potlatch—a hallmark of fall in the Northwest. A few other rivers may also approach flood stage and will be monitored closely.
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