Dave Killen | The Oregonian

A wintry mix of snow and freezing rain fell in SE Portland near 70th and Duke the morning of Dec. 24, 2017.



Snow is falling in Southeast Portland. Freezing rain in North. Sleet in Southwest.

A day of wintry mix has begun, and it's important to keep safe as roads become difficult to navigate.

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We are now in the middle of the event and it is still a complicated forecast. Precip going back and forth between freezing rain, snow, and sleet for many areas. Weather is hard... https://t.co/LTJosPjBaT — NWS Portland (@NWSPortland) December 24, 2017

The National Weather Services warns that everyone should avoid traveling today, if possible. Crashes are piling up on all major highways and neighborhood streets are icy.

As the precipitation toggles between sleet, rain and snow, road conditions will likely worsen or be unpredictable.

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Alexis Holloway | The Oregonian

St. Johns in North Portland sees sticking ice and snow. By 11:30 a.m. Christmas Eve, a wintry mix already caused significant travel woes.

The National Weather Service now expects one to two inches of snow by Monday morning.

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Dave Killen | The Oregonian

TriMet announced that workers started chaining buses at their parking lot in case they are needed. More than half of the fleet is equipped with drop-down chains.

Officials said that the transit agency plans to keep the MAX running throughout the night to prevent ice buildup on the overhead wires, which would stall the light rail.

Line 63 has been canceled because of road conditions, as of 10:45 a.m. Sunday.

All public transportation will run on Sunday schedules on Monday, Christmas Day. WES, the TriMet Ticket Office and Rider Support line are all closed.

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Randy Mishler | The Oregonian

Interstate 5 southbound through Vancouver is largely clear, but snow and ice is falling.

C-Tran routes 19 and 32 are on snow routes for the rest of the day, according to the agency.

The Grotto's Festival of Lights is also closed tonight.

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The zoo will close at 1 p.m. today, Dec. 24, due to icy conditions. Stay safe out there! Posted by Oregon Zoo on Sunday, December 24, 2017

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Winter weather throughout county. Freezing rain = dangerous roads. Please give yourself more time or stay off the roads. #DriveSafe pic.twitter.com/YtTMhIztLT — Clackamas Fire (@clackamasfire) December 24, 2017

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The freezing rain is here and is slowly building up. Please be safe while driving and keep it slow and steady. #NoChristmasEveCrash pic.twitter.com/voCZn3jyEa — Beaverton Police (@BeavertonPolice) December 24, 2017

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Freezing rain in Tigard right now. City crews will use deicer on the priority roads, and monitor the situation.



Please use caution as you plan your holiday travel. Visit https://t.co/X4oonMPSaf for tips from the Tigard Police Department’s traffic unit. pic.twitter.com/YMqnrBzfqN — City of Tigard (@TigardOR) December 24, 2017

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Icy out there in NE Portland, as freezing rain keeps accumulating. #pdxtst @Oregonian pic.twitter.com/NK36kEMsjA — Kristi Turnquist (@Kristiturnquist) December 24, 2017

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Elliot Njus | The Oregonian/OregonLive

Ice pellets accumulate in St. Johns. Walking could be dangerous too, so be careful outside.

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#pdxtraffic Well, that didn't take long. This was ALL GREEN just 40 min ago. Dang. Careful folks. pic.twitter.com/S68YciShOI — PDX Traffic Alerts (@TrafficPortland) December 24, 2017

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Elliot Njus | The Oregonian/OregonLive

The National Weather Services recommends anyone traveling take precautions. Cars with four-wheel drive do well in snow, but aren't much more helpful in ice.

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Kristi Turnquist | The Oregonian/OregonLive

Bird baths freeze over in Northeast Portland.



Corbett Hill and Merson roads are open again after being closed overnight, according to Multnomah County. They were closed because of ice.

Multnomah County crews dropped rock and magnesium chloride on all county roads east of the Sandy River. On Sunday, they are treating the rest of the East County roads.

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There’s a dusting at PDX and the flight crew members are making snow angels while our plane gets de-iced. ❄️ ⛄️ — Kelly House (@Kelly_M_House) December 24, 2017

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Our crews are currently out reapplying anti-icer to all our routes. But roads can still be slick. See the map here: https://t.co/aPZGtkYls9 #pdxtraffic #pdxtst https://t.co/dmSG7TADG8 — Portland Bureau of Transportation (@PBOTinfo) December 24, 2017

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Still could see a White Christmas yet! In the process of updating the forecast to add an inch or two if snow for most of the Portand metro area north of Tigard and Oregon City. — NWS Portland (@NWSPortland) December 24, 2017

Commence panic -- or glee?

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Drew Vattiat | The Oregonian/OregonLive

The wintry mix hasn't stopped shoppers in Northwest Portland.



Northwest 23rd is still busy as people shop, eat and try not to slip on ice.

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A few more from Gresham where it is currently snowing hard! pic.twitter.com/FySKkyIqxo — Mountain Wave SAR (@MountainWaveSAR) December 24, 2017

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JUST IN: Multiple stalled vehicles have I-5 northbound closed on the approach to the Marquam Bridge. Use alternate route. — KATU News (@KATUNews) December 24, 2017

Crashes are slowing traffic throughout the metro area.

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Deputies working the Bethany area reporting that many streets are a sheet of ice. Stay home if possible.#PDXtraffic #pdxtst pic.twitter.com/r986eDLhwS — WCSO Oregon (@WCSOOregon) December 24, 2017

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Maxine Bernstein | The Oregonian/OregonLive

City de-icer out on Southwest Barbur Boulevard Sunday afternoon.



Traffic moving smoothly. Downtown Portland streets turning to slush.

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Heading to the station. Stopped for gas. Here’s a quick example of a car with 2-wheel drive on a steep road. Not too bad with my all wheel drive so far. @KOINNews #wawx #orwx @NWSPortland pic.twitter.com/hDo2E0MTfp — NATASHA STENBOCK (@NatashaKOIN6) December 24, 2017

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The National Weather Service Sunday afternoon is predicting that the Portland area could see one to two inches of snow Sunday night.

That will change to light freezing rain or drizzle after about 9 p.m. The precipitation will taper off for Christmas Day with a slight warming, as temperatures rise above freezing in the Portland metropolitan area, except for the Columbia Gorge, according to the weather service.

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Here is part of our drive through the West Hills. It's an adventure out there folks. Roads are pretty slick. pic.twitter.com/BZSLvrSWpE — John Hendricks (@JohnKPTV) December 24, 2017

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Washington County has activiated a Barnes Road snow zone, requiring traction devices on vehicles from Baltic Avenue to the county line.

Motorists are required by law to use traction control devices - including chains, studded tires, mountain snowflake tires, winter tires or "tire socks" - on their vehicles or avoid this area. Traction device violations are a "secondary offense," meaning citations will be issued when motorists are observed violating other traffic laws or driving unsafely.

The citations carry a fine of up to $160.

Do not abandon vehicles on roads, as they can impact drivers' lines of sight and block snowplows, emergency vehicles, public transit and other vehicles. Abandoned vehicles will be reported to the Washington County Sheriff's Office for possible citation or towing. The citations carry a fine of about $110, plus towing costs.

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Here is a zoomed out look at snowfall totals expected across the area. pic.twitter.com/hhGpm8U13Z — NWS Portland (@NWSPortland) December 25, 2017

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A disabled semi on southbound I-5 on the Interstate Bridge has traffic backed up to SR 500 in #VanWA. Expect delays or use an alternate route. pic.twitter.com/tI9dBljMBO — WSDOT - Southwest (@wsdot_sw) December 25, 2017

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Slow and bumper to bumper on I-5N near Delta Park, but at least people are driving carefully. pic.twitter.com/7bwR1WhQBM — Michelle Brence (@mbrence) December 25, 2017

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One of our night shift officers just informed me his kids did a snow dance last night before bed. Well played kids....well played. pic.twitter.com/ymYPZvOgvM — Beaverton Police (@BeavertonPolice) December 25, 2017

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A little over a half an inch of snow now at our office in NE Portland. — NWS Portland (@NWSPortland) December 25, 2017

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@NWSPortland around 1/4 inch is snow/sleet by Hare Field in Hillsboro pic.twitter.com/epdWxvQRPW — Mountain Wave SAR (@MountainWaveSAR) December 25, 2017

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#WashCoLUT has activated snow zones on both Barnes and Cornell Roads. Traction devices are required. Visit https://t.co/kXLiuRxMNv. #pdxtraffic pic.twitter.com/lLHO60Bzmm — Washco Oregon Roads (@washcoroads) December 25, 2017

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Third warming shelter open tonight, Dec. 24. For updates: https://t.co/eB6Mv8XJOB — Multnomah County, OR (@multco) December 25, 2017

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We just updated snowfall amounts again for the metro area. Given the further south track of the surface low, expecting... Posted by US National Weather Service Portland Oregon on Sunday, December 24, 2017

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Please delay travel if possible! Traffic SB I5 is currently backed to SR500 & growing. Icy conditions on bridge deck. https://t.co/KaAkhL63Tt — Trooper Will Finn (@wspd5pio) December 25, 2017

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Two lanes of SB I-5 across the Interstate Bridge are now OPEN. Traffic is backed up past SR 500 in #VanWa. Expect LONG delays. #wawx pic.twitter.com/Gajo6doliv — WSDOT - Southwest (@wsdot_sw) December 25, 2017

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Well, that's #ChristmasEve2017 in Portland. Please be safe on the roads! The Uniplower is working extra hard this evening, but there are still some areas I haven't made it to yet! Patience! #pdxtst #MerryChristmasEveryone #MerryChristmas #ChristmasEve #pdx pic.twitter.com/ZSjaPIBUR3 — The Unipiper (@TheUnipiper) December 25, 2017