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PORTLAND -- A second wave of snow, similar to the one that snarled traffic in Portland Thursday, hit the metro area around mid-afternoon Friday.

The snow was expected to continue and even become heavier into the evening, according to KGW Meteorologist Rod Hill. Saturday could see 1 to 3 inches of snow with a mix of sleet and frozen rain.

Snowy crashes were reported on Interstate 205 southbound at Oregon 212 and on Interstate 84 westbound near Rooster Rock around 3 p.m., both slowing traffic to a standstill in the area.

The City of Salem announced Friday evening that all vehicles were required to have chains or traction tires.

A crash closed Interstate 5 northbound about 9 miles north of Albany for an hour Friday afternoon. The freeway reopened at 4 p.m., but traffic was still extremely slow.

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Transportation officials held a Portland press conference at 2:30 p.m., warning people not to drive unless they absolutely have to. People who must drive should be prepared with traction devices.

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The National Weather Service issued Winter Storm Warnings for the Vancouver and Portland Metro areas, Central Willamette Valley and the Columbia River Gorge, in effect from 2 p.m. Friday until 10 a.m Saturday.

They warned of dangerous driving conditions, up to 6 inches of new snow accumulation, high east winds, and occasional blizzard conditions.

Thursday night most metro area schools announced closure plans for Friday, after several inches hit the area and caused major gridlock.

Many drivers on Portland-area highways and interstates abandoned their vehicles after they couldn't drive in Thursday's snow storm. On Friday, they scrambled to recover their vehicles before the next wave of snow hit.

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The City of Portland announced Friday morning that operations were shut down except for essential workers.

Latest: Event, private sector, government closures

The snow and cold was also affecting TriMet buses and light rail Thursday and Friday. Many buses chained up and TriMet officials said service was restored but riders should expect delays due to the snow.

TriMet Service Alerts

At the Portland International Airport, 38 flights were canceled after the second wave of snow moved in Friday.

PDX: Delayed or canceled flights

The Thursday storm dumped a surprisings 7 to 8 inches on some coastal towns and 11 inches in Corvallis.

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