Snowflakes could drop to the valley floor overnight

KGW Sunrise forecast 12-4-16

PORTLAND, Ore. – Snow on the valley floor is possible on Sunday night going into Monday morning, but it will most likely be a mix of snowflakes and rain if it reaches the low elevations.

The National Weather Service has issued a Winter Weather Advisory, in effect until 4 p.m. Monday, for snow in the Cascade foothills. Another Winter Weather Advisory, for the Coast Range passes, goes into effect from 1 a.m. until noon Monday.

Elevation charts:   Metro   |   Willamette Valley   |   Cascades/Coast

"Between 500 and 1,000 feet, up to an inch or two of accumulation is possible," said KGW meteorologist Keely Chalmers.

Snow falling in those neighborhoods between 500 and 1,000 feet could have an impact on the Monday morning commute, including school buses switching to snow routes.

"Below 500 feet, within the city, the most likely scenario is snow flakes in the air and melting when they hit the ground," Chalmers said. "But if we get enough cooling with enough snow, we could get up to a half of an inch."

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Above 1,000 to 1,500 feet there will be 4-8 inches of snow in the Coast Range passes and Cascade foothills. The Cascade ski areas should get 12-20 inches of snow on Sunday alone, with more on the way Monday.

“Skiing is about to get really good!” KGW chief meteorologist Matt Zaffino said.

At-a-glance:   Daypart   |   7-day 

Tuesday will be cold but dry with valley lows in the 20s and highs in the 30s. A new storm Wednesday may bring freezing rain, especially in the Gorge, and perhaps a wintry mix in the metro area on Thursday.

The prospect of snow has the Reddit community talking "Snowpocalypse" and "SnoMG 2016" this week, as Portland tends to grind to a halt when a couple inches hit the valley floor.

Reddit: Snowpocalypse scheduled for next Wednesday

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