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SABSEW * WHAT...A SIGNIFICANT WINTER STORM, A VARIABLE AND WEAK SNOWPACK, AND A BUSY WEEKEND COULD COMBINE FOR UNIQUELY DANGEROUS AVALANCHE CONDITIONS. AVALANCHES MAY TRIGGER EASILY AND COULD BREAK WIDELY. * WHERE...THE WASHINGTON CASCADES FROM THE CANADIAN BORDER TO THE COLUMBIA RIVER, MT HOOD, AND THE OLYMPIC MOUNTAINS. * WHEN...IN EFFECT FROM THU 18:00 PST TO SUN 18:00 PST. * IMPACTS...A PROLONGED DRY PERIOD IN JANUARY CRATED A HIGHLY VARIABLE AND POTENTIALLY WEAK SNOWPACK. ACTIVE WEATHER INCLUDING SIGNIFICANT SNOWFALL AND WINDS COULD MAKE THESE LAYERS UNSTABLE. HUMANS MAY EASILY TRIGGER AVALANCHES LARGE ENOUGH TO BURY OR INJURE A PERSON.

* WHAT...Snow expected. Total snow accumulations 1 to 4 inches. * WHERE...In Idaho, Upper Weiser River. In Oregon, Baker County and Oregon Lower Treasure Valley. * WHEN...From 8 AM MST /7 AM PST/ to 5 PM MST /4 PM PST/ Friday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Travel could be difficult. The hazardous conditions could impact Friday's commutes.

* WHAT...Heavy snow possible. Total snow accumulations between 2 and 9 inches possible. * WHERE...Central Coast and Lower Chehalis Valley Area. * WHEN...From Saturday evening through Monday morning. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday morning commute. * ADDITIONAL DETAILS...The heaviest snowfall amounts will be away from the water, especially along the southwest slopes of the Olympics. Snow may mix in with rain at times, primarily along the water on Sunday. The potential for refreezing exists Monday morning.

* WHAT...Heavy snow possible. Total snow accumulations between 3 and 12 inches possible. The highest snowfall amounts will be away from the water. Locally higher snowfall amounts are possible in the higher elevations. * WHERE...North Coast and Western Strait of Juan De Fuca. * WHEN...From Friday evening through Monday morning. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Monday morning commute. * ADDITIONAL DETAILS...Rain will transition to a rain and snow mix Friday night into Saturday morning. The highest potential for accumulating snowfall will be Saturday night through Monday. The potential for refreezing exists Monday morning.

* WHAT...Heavy snow possible. Total snow accumulations between 2 and 7 inches possible. * WHERE...East Puget Sound Lowlands. * WHEN...From Saturday evening through Monday morning. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday morning commute. * ADDITIONAL DETAILS...Snow showers will be likely at times during this period. The heaviest snowfall amounts are expected in the higher elevations near the Cascades. The potential for refreezing exists Monday morning.

* WHAT...Heavy snow possible. Total snow accumulations between 2 and 7 inches possible. * WHERE...San Juan County and Western Whatcom County. * WHEN...From Saturday evening through Monday morning. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday morning commute. * ADDITIONAL DETAILS...Snow showers are likely at times Saturday night through Monday morning, with localized heavier snowfall amounts possible. The potential for refreezing exists Monday morning.

* WHAT...Heavy snow expected at or above elevations greater than 3000 ft. Total snow accumulations between 10 and 30 inches. Winds gusting as high as 40 mph. * WHERE...West Slopes North Cascades and Passes, West Slopes North Central Cascades and Passes, and West Slopes South Central Cascades and Passes. * WHEN...From 10 PM this evening to 4 PM PST Saturday. * IMPACTS...Travel could be very difficult to impossible. * ADDITIONAL DETAILS...Snow levels will start around 2500-3500 feet tonight before rising to 4000 feet Friday afternoon. Snow levels will then lower to near 2000 feet Friday night. Precipitation will begin as snow for Snoqualmie Pass, before transitioning to rain Friday afternoon. Rain will then transition to snow again at Snoqualmie Pass and increase in intensity Friday night.

* 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. * WHERE...Portions of south central, southwest, and west central Idaho and northeast and southeast Oregon. * WHEN...Until 5 AM MST /4 AM PST/ Friday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.

* WHAT...Heavy snow possible above 3000 feet. Total snow accumulations between 6 and 12 inches, and up to 15 inches above 5000 ft. Winds could gust as high as 40 mph. * WHERE...South Washington Cascades and the Northern and Central Cascades of Oregon. * WHEN...From 4 AM Friday to 4 PM PST Saturday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. * ADDITIONAL DETAILS...Snow levels will start around 4000-5000 ft on Friday, before lowering towards 3000-3500 ft by Friday night. Heavier precipitation to start late Friday morning with a slow decrease in intensity through Saturday morning.

* WHAT...Heavy snow possible. Total snow accumulations of 2 to 4 inches possible. * WHERE...In Oregon, North Oregon Coast Range. In Washington, Willapa Hills. * WHEN...From Friday evening through Saturday afternoon. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. * ADDITIONAL DETAILS...Snow levels will start around 3000-4000 ft on Saturday morning, before lowering towards 500-1000 ft by late Saturday morning.

* WHAT...Heavy snow possible above 3000 feet. Total snow accumulations between 6 and 12 inches, and up to 15 inches above 5000 ft. Winds could gust as high as 40 mph. * WHERE...South Washington Cascades and the Northern and Central Cascades of Oregon. * WHEN...From 4 AM Friday to 4 PM PST Saturday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. * ADDITIONAL DETAILS...Snow levels will start around 4000-5000 ft on Friday, before lowering towards 3000-3500 ft by Friday night. Heavier precipitation to start late Friday morning with a slow decrease in intensity through Saturday morning.

* WHAT...Heavy snow possible. Total snow accumulations of 2 to 4 inches possible. * WHERE...In Oregon, North Oregon Coast Range. In Washington, Willapa Hills. * WHEN...From Friday evening through Saturday afternoon. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. * ADDITIONAL DETAILS...Snow levels will start around 3000-4000 ft on Saturday morning, before lowering towards 500-1000 ft by late Saturday morning.

...SNOW AND AREAS OF FREEZING RAIN TONIGHT THROUGH SATURDAY... .A significant change in the weather pattern begins tonight as winter storm system arrives from the Pacific and brings moderate to heavy snow to the Cascades and Blue Mountains. There will be rain and areas of light freezing rain across the Columbia Basin and the Kittitas and Yakima Valleys. * WHAT...Snow expected above 4000 feet. Total snow accumulations between 6 and 12 inches. Local winds gusting as high as 35 mph will cause blowing and drifting of snow. * WHERE...In Oregon, Northern Blue Mountains of Oregon. In Washington, Northwest Blue Mountains. * WHEN...From 4 AM Friday to 4 PM PST Saturday. * IMPACTS...Significant snowfall with periods of heavy snowfall rates will combine with low visibility to create very difficult driving conditions. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...Total snowfall accumulations for I-84 along the Blue Mountains, including Meacham, are only expected to be around 3 to 5 inches.

...SNOW AND AREAS OF FREEZING RAIN TONIGHT THROUGH SATURDAY... .A significant change in the weather pattern begins tonight as winter storm system arrives from the Pacific and brings moderate to heavy snow to the Cascades and Blue Mountains. There will be rain and areas of light freezing rain across the Columbia Basin and the Kittitas and Yakima Valleys. * WHAT...Heavy snow expected above 3000 feet. Total snow accumulations between 8 and 18 inches. Winds gusting as high as 50 mph along exposed ridgetops. * WHERE...Upper Slopes of the Eastern Washington Cascades Crest. * WHEN...From 10 PM this evening to 4 PM PST Saturday. * IMPACTS...Heavy snowfall and very low visibility will create extremely dangerous driving conditions. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...Precipitation will begin as snow for Snoqualmie Pass, before transitioning to rain Friday afternoon. Rain will then transition to snow again at Snoqualmie Pass Friday night.

...SNOW AND AREAS OF FREEZING RAIN TONIGHT THROUGH SATURDAY... .A significant change in the weather pattern begins tonight as winter storm system arrives from the Pacific and brings moderate to heavy snow to the Cascades and Blue Mountains. There will be rain and areas of light freezing rain across the Columbia Basin and the Kittitas and Yakima Valleys. * WHAT...Mixed precipitation expected. Light freezing rain will create ice accumulations of a glaze to one tenth of an inch. Little to no snow accumulation. * WHERE...Lower Columbia Basin of Oregon and Washington, Kittitas Valley, and Yakima Valley. * WHEN...From 10 PM this evening to 10 AM PST Friday. * IMPACTS...The hazardous conditions could impact the Friday morning commute. * ADDITIONAL DETAILS...Although the air temperature will be in the lower 30s for most areas, the road temperatures will be below freezing that will create light ice accumulations.

...SNOW AND AREAS OF FREEZING RAIN TONIGHT THROUGH SATURDAY... .A significant change in the weather pattern begins tonight as winter storm system arrives from the Pacific and brings moderate to heavy snow to the Cascades and Blue Mountains. There will be rain and areas of light freezing rain across the Columbia Basin and the Kittitas and Yakima Valleys. * WHAT...Snow expected above 4000 feet. Total snow accumulations between 6 and 12 inches. Local winds gusting as high as 35 mph will cause blowing and drifting of snow. * WHERE...In Oregon, Northern Blue Mountains of Oregon. In Washington, Northwest Blue Mountains. * WHEN...From 4 AM Friday to 4 PM PST Saturday. * IMPACTS...Significant snowfall with periods of heavy snowfall rates will combine with low visibility to create very difficult driving conditions. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...Total snowfall accumulations for I-84 along the Blue Mountains, including Meacham, are only expected to be around 3 to 5 inches.

...SNOW AND AREAS OF FREEZING RAIN TONIGHT THROUGH SATURDAY... .A significant change in the weather pattern begins tonight as winter storm system arrives from the Pacific and brings moderate to heavy snow to the Cascades and Blue Mountains. There will be rain and areas of light freezing rain across the Columbia Basin and the Kittitas and Yakima Valleys. * WHAT...Snow expected. Total snow accumulations between 5 and 10 inches with higher accumulations near the crest. Winds gusting as high as 50 mph along exposed ridgetops. * WHERE...East Slopes of the Oregon Cascades. * WHEN...From 10 PM this evening to 4 PM PST Saturday. * IMPACTS...Significant snowfall with periods of heavy snowfall rates will combine with low visibility to create very difficult driving conditions. Strong winds could cause extensive damage to trees and power lines. * ADDITIONAL DETAILS...Snow levels will rise from around 4000 feet Thursday night to around 5000 feet Friday afternoon. Snow levels will then lower to around 3000 feet and lower Friday night onward.

...SNOW AND AREAS OF FREEZING RAIN TONIGHT THROUGH SATURDAY... .A significant change in the weather pattern begins tonight as winter storm system arrives from the Pacific and brings moderate to heavy snow to the Cascades and Blue Mountains. There will be rain and areas of light freezing rain across the Columbia Basin and the Kittitas and Yakima Valleys. * WHAT...Mixed precipitation expected. Light freezing rain will create ice accumulations of a glaze to one tenth of an inch. Little to no snow accumulation. * WHERE...Lower Columbia Basin of Oregon and Washington, Kittitas Valley, and Yakima Valley. * WHEN...From 10 PM this evening to 10 AM PST Friday. * IMPACTS...The hazardous conditions could impact the Friday morning commute. * ADDITIONAL DETAILS...Although the air temperature will be in the lower 30s for most areas, the road temperatures will be below freezing that will create light ice accumulations.

* WHAT...Snow and blowing snow expected. Total snow accumulations 2 to 6 inches except up to 10 inches over the higher terrain of Winter Rim and the Warner Mountains. Winds gusting as high as 55 mph. * WHERE...Lake County and eastern Klamath County, Modoc County, and Klamath Basin. This includes Highway 97 north of Chiloquin, Highway 140 near Bly Summit, Quartz Mountain and in the Warners east of Lakeview. Also Highway 31 from Valley Falls to Silver Lake. * WHEN...From 4 AM Friday to 10 AM PST Saturday. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Friday morning and evening commutes. Strong winds could cause blowing and drifting snow with limited visibility and some power disruptions.

* WHAT...Heavy snow expected. Total snow accumulations between 12 and 24 inches above 5000 feet, with up to 30 inches possible over the highest peaks and ridgetops. Winds gusting as high as 50 mph. * WHERE...The southern Oregon Cascades and Siskiyou Mountains. This includes Highways 138 and 230 near Diamond Lake, Highway 62 near Crater Lake, Highway 140 near Lake of the Woods and Highway 58 at Willamette Pass and the Mt Ashland Ski Road up to the resort. * WHEN...From 1 AM Friday to 10 AM PST Saturday. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. The strong winds and weight of snow on tree limbs may down power lines and could cause sporadic power outages. * ADDITIONAL DETAILS...Snowfall rates from 10 am to 4 pm PST Friday and from 10 pm Friday to 4 am PST Saturday could reach 1 inch per hour at times.