The National Weather Service has issued a winter weather advisory for the region, with forecasters expecting snow between 8 p.m. Saturday and 10 p.m. Sunday.

The advisory covers the North Oregon Coast and all of Southwest Washington, including the Long Beach Peninsula.

The weather is predicted as forecasters track a low-pressure system developing off the north Washington coast that is expected to move southward Saturday night and throughout the day Sunday.

As it moves south, it will usher in much colder air and moisture - which may mean snow, even in coastal communities. Higher areas may see accumulations of one to four inches of snow. Three to seven inches of snow is already reported in parts of the Coast Range, and there are winter storm warnings in effect for Columbia and Wahkiakum (Wash.) counties.

Authorities are warning that travel conditions will be hazardous with snow on highways and limited visibility. The Oregon Department of Transportation says it is gearing up to cope with plowing and other efforts to keep highways open.

Although the high surf warning remains in effect until 10 p.m. Saturday, the coastal flood warning has been cancelled.

Northwest swells of 20 to 22 feet will continue to pound the north Oregon and South Washington coast today. Seas will decrease this evening but the U.S. Coast Guard continues to urge boaters to exercise caution. The Coast Guard has closed the Quillayute River Bar near Forks, Wash., because of the heavy weather until further notice.

Waters levels near bays and estuaries on the North Coast have receded following the high tide earlier Saturday. As a result, the threat of minor tidal overflow has ended.

The Weather Service says more showers are likely on the North Coast Saturday with winds through 10 p.m.

Here are details of the forecast for coming days:

Sunday: Snow showers. Temperature rising to near 36 by noon, then falling to around 32 during the remainder of the day. West wind 6 to 16 mph becoming east. Chance of precipitation is 80 percent. New snow accumulation of less than one inch is possible.

Sunday Night: Snow showers likely, mainly before 10 p.m. Mostly cloudy, with lows around 20. East northeast winds around 21 mph, with gusts as high as 32 mph. Chance of precipitation is 60 percent.

Monday: A 20 percent chance of snow showers before 10am. Mostly cloudy, with a high near 31. East winds around 17 mph, with gusts as high as 23 mph.

Monday Night: Partly cloudy, with a low around 18.

Tuesday: Mostly sunny, with a high near 28.

Tuesday Night: Partly cloudy, with a low around 25.

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