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* WHAT...Sneaker waves possible on the beaches. * WHERE...North and Central Coast of Oregon, and South Washington Coast. * WHEN...From late tonight through Sunday evening. * IMPACTS...Waves can run up significantly farther on a beach than normal, including over rocks and jetties. Sneaker waves can suddenly knock people off of their feet and quickly pull them into the frigid ocean which may lead to serious injury or drowning.

* WHAT...Sneaker waves possible on the beaches. * WHERE...North and Central Coast of Oregon, and South Washington Coast. * WHEN...From late tonight through Sunday evening. * IMPACTS...Waves can run up significantly farther on a beach than normal, including over rocks and jetties. Sneaker waves can suddenly knock people off of their feet and quickly pull them into the frigid ocean which may lead to serious injury or drowning.

* WHAT...Mixed precipitation expected. Total snow accumulation up to one inch along with a thin glaze of ice. * WHERE...Lower Treasure Valley Zones, and Malheur County. * WHEN...From 7 PM MST /6 PM PST/ to 11 PM MST /10 PM PST/ this evening. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Plan on slippery road conditions.

* WHAT...Snow expected above 3000 feet. Total snow accumulations 6 to 10 inches. Winds gusting as high as 40 mph. * WHERE...In Oregon, North Oregon Cascades. In Washington, South Washington Cascades. * WHEN...Until 4 PM PST Sunday. * IMPACTS...Travel could be very difficult. * ADDITIONAL DETAILS...Snow levels will lower to 3000 feet tonight with the period of heaviest snowfall expected to occur late tonight through Sunday morning.

* WHAT...Snow expected above 3000 feet. Total snow accumulations 6 to 10 inches. Winds gusting as high as 40 mph. * WHERE...In Oregon, North Oregon Cascades. In Washington, South Washington Cascades. * WHEN...Until 4 PM PST Sunday. * IMPACTS...Travel could be very difficult. * ADDITIONAL DETAILS...Snow levels will lower to 3000 feet tonight with the period of heaviest snowfall expected to occur late tonight through Sunday morning.

* WHAT...A moderate risk of sneaker waves is expected. * WHERE...The beaches and shorelines of Curry, Coos, and Douglas counties. * WHEN...From Monday evening through Tuesday afternoon. * IMPACTS...Sneaker waves can run up significantly farther on beaches than normal, including over rocks and jetties. These waves can suddenly knock people off of their feet and quickly pull them into the cold ocean waters, resulting in serious injury or death. Waves may also lift driftwood logs, trapping anyone caught underneath. * View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

* WHAT...Heavy mixed precipitation expected. Freezing rain will transition to snow early this afternoon. Additional ice accumulations up to 0.10". Snow then becomes heavier this evening. Total snow accumulations between 1 and 3 feet by Sunday afternoon above 3500 feet. * WHERE...Holden Village, Stehekin, and Stevens Pass. * WHEN...Until 4 PM PST Sunday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. * ADDITIONAL DETAILS...Snow totals for Stehekin and Coles Corner will be between 1 and 3 inches.

* WHAT...Mixed precipitation expected. Total snow and sleet accumulations of 2 to 6 inches over the mountains, up to 2 inches of snow near the Canadian border, and additional ice accumulations around 0.10 inches. * WHERE...Bonners Ferry, Springdale-Hunters Road, Athol, Sandpoint, Clark Fork, Tiger, Metaline, Deer Park, Ione, Eastport, Flowery Trail Road, Newport, Orin-Rice Road, Schweitzer Mountain Road, Northport, Priest River, Fruitland, Chewelah, Colville, Kettle Falls, and Metaline Falls. * WHEN...Until 10 PM PST this evening. * IMPACTS...Plan on slippery road conditions. * ADDITIONAL DETAILS...Additional light snow is expected through Sunday morning.

* WHAT...Moderate mixed precipitation expected. Freezing rain with ice accumulations up to a quarter of an inch. Snow then becomes heavier with total snow accumulations of 4 to 8 inches tonight into Sunday near the Cascade Crest. * WHERE...Loup Loup Pass, Leavenworth, Twisp, Conconully, Methow, Winthrop, Mazama, and Plain. * WHEN...Until 7 PM PST this evening. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick.

* WHAT...Mixed precipitation expected. Total ice accumulations of a tenth of an inch or less. Snow accumulation up to 1 inch around the West Plains this afternoon and evening. * WHERE...Portions of Central, East Central, North Central, and Northeast Washington. * WHEN...Until 7 PM PST this evening. * IMPACTS...Plan on slippery road conditions. * ADDITIONAL DETAILS...Temperatures will slowly warm above freezing this morning, but there will continue to be cold pockets where freezing rain will continue through the afternoon.

* WHAT...South winds 30 to 35 mph with gusts around 45 mph for the southern Grande Ronde Valley near Ladd and Pyles Canyons. * WHERE...Grande Ronde Valley. * WHEN...Until 4 PM PST this afternoon. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

* WHAT...Fog has decreased and visibility has improved. An extended period of stagnant air, with light winds and little vertical mixing. This is due to an inversion near the surface that will continue to trap pollutants in valleys. * WHERE...Lower Treasure Valley Zones, and Upper Weiser River. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.

* WHAT...An extended period of stagnant air, with light winds and little vertical mixing. This is due to an inversion near the surface that will continue to trap pollutants in valleys. * WHERE...Portions of south central, southwest, and west central Idaho and northeast and southeast Oregon. * WHEN...Until 5 PM MST /4 PM PST/ this afternoon. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.

A thin layer of below freezing temperatures is trapped in the Hood River Valley this morning as light rainfall begins to increase across the region. Patchy freezing rain has been reported by the cites of Parkdale, Glenwood, and Odell. Temperatures will be slow to warm heading into the midday hours allowing light freezing rain to continue until 1200-1300 PST. Light ice accumulations of 0.02-0.06 inches this morning may impact travel and make surfaces slick. Slippery road conditions are difficult to see and can catch driver off guard, increasing the risk of car accidents; use caution.

* WHAT...An extended period of stagnant air, with light winds and little vertical mixing. This is due to an inversion near the surface that will continue to trap pollutants in valleys. * WHERE...Portions of south central, southwest, and west central Idaho and northeast and southeast Oregon. * WHEN...Until 5 PM MST /4 PM PST/ this afternoon. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.

* WHAT...For the Air Stagnation Advisory in valleys, an extended period of stagnant air, with light winds and little vertical mixing. This is due to an inversion near the surface that will continue to trap pollutants. For the Dense Fog Advisory, visibility less than one mile in dense fog. * WHERE...Lower Treasure Valley Zones, and Upper Weiser River. * WHEN...For the Air Stagnation Advisory, until 5 PM MST this afternoon. For the Dense Fog Advisory, until 11 AM MST this morning. * IMPACTS...Poor air quality may cause issues for people with respiratory problems. Low visibility could make driving conditions hazardous.

* WHAT...For the Air Stagnation Advisory in valleys, an extended period of stagnant air, with light winds and little vertical mixing. This is due to an inversion near the surface that will continue to trap pollutants. For the Dense Fog Advisory, visibility less than one mile in dense fog. * WHERE...Lower Treasure Valley Zones, and Upper Weiser River. * WHEN...For the Air Stagnation Advisory, until 5 PM MST this afternoon. For the Dense Fog Advisory, until 11 AM MST this morning. * IMPACTS...Poor air quality may cause issues for people with respiratory problems. Low visibility could make driving conditions hazardous.

* WHAT...Heavy snow expected at or above elevations greater than 3000 ft. Total snow accumulations between 10 and 16 inches. Winds gusting as high as 40 mph. * WHERE...West Slopes North Cascades and Passes and West Slopes North Central Cascades and Passes. * WHEN...From 4 PM this afternoon to 4 PM PST Sunday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Travel could be very difficult to impossible. * ADDITIONAL DETAILS...Expect 6 to 10 inches of snow at Snoqualmie Pass. Stevens and Snoqualmie Passes are observing freezing rain early this morning. Expect slick roads prior to the transition to snow and onset of snow on roadways.

* WHAT...Snow expected at or above elevations greater than 3000 ft. Total snow accumulations between 6 to 10 inches. Winds gusting as high as 45 mph. * WHERE...West Slopes South Central Cascades and Passes. * WHEN...From 4 PM this afternoon to 4 PM PST Sunday. * IMPACTS...Plan on slippery road conditions. * ADDITIONAL DETAILS...Freezing rain may mix in prior to the transition to snow. This will cause slick roadways prior to the onset of snow onto roadways.

* WHAT...Snow expected. Total snow accumulations up to 10 inches. Winds gusting as high as 40 mph. * WHERE...Upper Slopes of the Eastern Washington Cascades Crest. * WHEN...From 4 PM this afternoon to 4 PM PST Sunday. * IMPACTS...Periods of moderate to heavy snow will cause low visibilities and create difficult driving conditions.