The National Weather Service on Saturday extended a flood watch for Snohomish County through Monday afternoon as steady rains were expected to continue.
A flood watch means conditions are favorable for flooding but nothing is imminent.
The most likely problems were landslides, water pooling on roadways or backed-up storm drains, meteorologist Dennis D’Amico said.
The Weather Service predicted three-quarters to 2 inches of rain would fall on the lowlands between Saturday and Sunday afternoons, and 3-5 inches in the mountains. The rain-soaked earth poses a special danger for landslides on steep slopes.
Snow levels are likely to range between 8,000 and 9,000 feet.
Wind gusts of up to 45 mph were expected early Sunday, with sustained winds of 20-30 mph, D’Amico said.
The Northwest Weather and Avalanche Center warned of increasing avalanche danger above 4,000 feet Sunday, and considerable danger below that.