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PORTLAND -- As much as three feet of snow could fall in the Cascades above 6,000 feet as rain turns to snow Friday, and highway passes could see as much as 18 inches, forecasters said.

The National Weather Service issued a winter storm warning for the mountains through midnight.

More:Forecast

The same front could bring three to six inches of snow in the Coast Range, according to KGW meteorologist Nick Allard.

Snow could appear as low as 1,500 feet in the foothills, Allard said, but heavy rain was expected later Friday in Portland, Southwest Washington and the Willamette Valley.

Related:Downed power lines and trees

Mt. Hood Meadows reported a foot of new snow overnight Thursday.

There was concern about the increased dangers of fallen trees and landslides as the ground saturates.

Oxbow Regional Park along the Sandy River was closed until at least Saturday due to high water conditions and the Clackamas River crested at about 6 inches above flood stage Friday morning.

KGWDoppler radars

A Flood Advisory remained in effect Friday for the coast, the Cascades and the central Willamette Valley, according to the National Weather Service.

More: City warns of high-water areas in Portland

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More: Ski runs getting slushy on Mt Hood

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