Aggregator

* 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...Portions of southwest and west central Idaho and southeast Oregon. * 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...Portions of southwest and west central Idaho and southeast Oregon. * 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...Mixed precipitation expected. Total snow accumulations up to one inch. Freezing rain possible which may cause slick roads. Ice accumulations under 0.10 inch. * WHERE...Lower Treasure Valley Zones, and Malheur County. * WHEN...From 5 PM MST /4 PM PST/ this afternoon to 5 AM MST /4 AM PST/ Sunday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Plan on slippery road conditions.

* WHAT...Heavy mixed precipitation expected. Freezing rain and light snow is expected first through Saturday morning with ice accumulations up to a quarter of an inch. Snow then becomes heavier with Total snow accumulations up to 12 to 18 inches tonight into Sunday. Winds gusting as high as 35 mph. * WHERE...Holden Village, Stevens Pass, and Stehekin. * WHEN...Until 4 PM PST Sunday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous.

* WHAT...Mixed precipitation expected. Total snow and sleet accumulations of 2 to 6 inches over the mountains and ice accumulations around 0.10 to 0.20 inches. * WHERE...Tiger, Sandpoint, Northport, Springdale-Hunters Road, Ione, Eastport, Kettle Falls, Priest River, Fruitland, Metaline, Colville, Athol, Deer Park, Chewelah, Flowery Trail Road, Clark Fork, Newport, Bonners Ferry, Metaline Falls, Orin-Rice Road, and Schweitzer Mountain Road. * WHEN...Until 10 PM PST this evening. * IMPACTS...Travel could be very difficult. * ADDITIONAL DETAILS...Additional light snow is expected in the mountains through Sunday morning.

* WHAT...Moderate mixed precipitation expected. Freezing rain and light snow is expected this morning 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 . Winds gusting as high as 35 mph. * WHERE...Mazama, Loup Loup Pass, Winthrop, Methow, Plain, Twisp, Leavenworth, and Conconully. * WHEN...Until 7 PM PST this evening. * IMPACTS...Plan on slippery road conditions.

* WHAT...Mixed precipitation expected. Total ice accumulations of a tenth of an inch or less and little to no snow accumulation. Some localized ice amounts of up to two tenths of an inch is possible from west of Spokane towards Sprague and Creston. * 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...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of northwest Washington, including the following county, Mason. * WHEN...From this afternoon through Sunday evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - A storm system will bring 2 to 3 inches of rain, possibly more to the Olympic mountains into Sunday morning. With snow levels above 7000 feet for the bulk of the precipitation, most of that will be rain and that could be enough to drive the Skokomish River above flood stage. The current river forecast has it cresting just below flood stage Sunday morning. - http://www.weather.gov/safety/flood

* WHAT...Light winds and limited air movement will lead to a period of stagnant air conditions. This scenario could result in the build up of air pollutants over time. * WHERE...Foothills of the Northern and Central Oregon Cascades, North and Central Coast Range Valleys of Oregon, Lower Columbia River and Cowlitz River Valleys, Central Willamette Valley, Tualatin Valley, Outer Southeast Portland Metro, Willapa and Wahkiakum Lowlands, North Clark County Lowlands, and South Washington Cascade Foothills. * WHEN...Until 4 AM PST Saturday. * IMPACTS...Deteriorating air quality may cause issues for people with respiratory problems.

* WHAT...Light winds and limited air movement will lead to a period of stagnant air conditions. This scenario could result in the build up of air pollutants over time. * WHERE...Inner Vancouver Metro. * WHEN...Until 4 AM PST Saturday. * IMPACTS...Deteriorating air quality may cause issues for people with respiratory problems.

* WHAT...For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. For the Air Stagnation Advisory, light winds and limited air movement will lead to a period of stagnant air conditions. This scenario could result in the build up of air pollutants over time. * WHERE...South Willamette Valley. * WHEN...For the Dense Fog Advisory, until 9 AM PST Saturday. For the Air Stagnation Advisory, until 4 AM PST Saturday. * IMPACTS...Deteriorating air quality may cause issues for people with respiratory problems. Low visibility could make driving conditions hazardous.

* WHAT...For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. For the Air Stagnation Advisory, light winds and limited air movement will lead to a period of stagnant air conditions. This scenario could result in the build up of air pollutants over time. * WHERE...South Willamette Valley. * WHEN...For the Dense Fog Advisory, until 9 AM PST Saturday. For the Air Stagnation Advisory, until 4 AM PST Saturday. * IMPACTS...Deteriorating air quality may cause issues for people with respiratory problems. Low visibility could make driving conditions hazardous.

* WHAT...Light winds and limited air movement will lead to a period of stagnant air conditions. This scenario could result in the build up of air pollutants over time. * WHERE...Foothills of the Northern and Central Oregon Cascades, North and Central Coast Range Valleys of Oregon, Lower Columbia River and Cowlitz River Valleys, Central Willamette Valley, Tualatin Valley, Outer Southeast Portland Metro, Willapa and Wahkiakum Lowlands, North Clark County Lowlands, and South Washington Cascade Foothills. * WHEN...Until 4 AM PST Saturday. * IMPACTS...Deteriorating air quality may cause issues for people with respiratory problems.

* 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...From 4 PM Saturday to 4 PM PST Sunday. * IMPACTS...Travel could be very difficult. * ADDITIONAL DETAILS...Snow levels start off high Saturday morning at over 9000 ft before lowering to around 5000 ft Saturday afternoon and then down to 3000 ft Saturday night. Snow levels will then remain around 3000 ft through Sunday night. The period of heaviest snowfall is expected to occur late Saturday night 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...From 4 PM Saturday to 4 PM PST Sunday. * IMPACTS...Travel could be very difficult. * ADDITIONAL DETAILS...Snow levels start off high Saturday morning at over 9000 ft before lowering to around 5000 ft Saturday afternoon and then down to 3000 ft Saturday night. Snow levels will then remain around 3000 ft through Sunday night. The period of heaviest snowfall is expected to occur late Saturday night through Sunday morning.

...LIGHT FREEZING RAIN, MOUNTAIN SNOW EXPECTED THIS WEEKEND... .A system moving across our region will bring areas of rain and some light freezing rain to portions of the lower slopes of the eastern Washington Cascades as well as the Kittitas Valley on Saturday. Then on Sunday, areas of moderate snowfall will begin to fall across the Washington Cascades as well as the northern Blue Mountains of both Washington and Oregon. * 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 Saturday to 4 PM PST Sunday. * IMPACTS...Periods of moderate and heavy snow will combine with low visibilities to create difficult driving conditions.

...LIGHT FREEZING RAIN, MOUNTAIN SNOW EXPECTED THIS WEEKEND... .A system moving across our region will bring areas of rain and some light freezing rain to portions of the lower slopes of the eastern Washington Cascades as well as the Kittitas Valley on Saturday. Then on Sunday, areas of moderate snowfall will begin to fall across the Washington Cascades as well as the northern Blue Mountains of both Washington and Oregon. * WHAT...Snow expected. Total snow accumulations of 5 to 9 inches. Winds gusting as high as 40 mph. * WHERE...In Oregon, Northern Blue Mountains of Oregon. In Washington, Northwest Blue Mountains. * WHEN...From 4 PM Saturday to 4 PM PST Sunday. * IMPACTS...Periods of moderate and heavy snow will combine with low visibilities to create difficult driving conditions.

...LIGHT FREEZING RAIN, MOUNTAIN SNOW EXPECTED THIS WEEKEND... .A system moving across our region will bring areas of rain and some light freezing rain to portions of the lower slopes of the eastern Washington Cascades as well as the Kittitas Valley on Saturday. Then on Sunday, areas of moderate snowfall will begin to fall across the Washington Cascades as well as the northern Blue Mountains of both Washington and Oregon. * WHAT...Freezing rain expected. Total ice accumulations around a light glaze. * WHERE...Kittitas Valley and Lower Slopes of the Eastern Washington Cascades Crest. * WHEN...From 4 AM to 4 PM PST Saturday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous.

...LIGHT FREEZING RAIN, MOUNTAIN SNOW EXPECTED THIS WEEKEND... .A system moving across our region will bring areas of rain and some light freezing rain to portions of the lower slopes of the eastern Washington Cascades as well as the Kittitas Valley on Saturday. Then on Sunday, areas of moderate snowfall will begin to fall across the Washington Cascades as well as the northern Blue Mountains of both Washington and Oregon. * WHAT...Snow expected. Total snow accumulations of 5 to 9 inches. Winds gusting as high as 40 mph. * WHERE...In Oregon, Northern Blue Mountains of Oregon. In Washington, Northwest Blue Mountains. * WHEN...From 4 PM Saturday to 4 PM PST Sunday. * IMPACTS...Periods of moderate and heavy snow will combine with low visibilities to create difficult driving conditions.

* WHAT...Heavy snow expected at or above elevations greater than 3000 ft. Total snow accumulations between 9 and 14 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 Saturday to 4 PM PST Sunday. * IMPACTS...Travel could be very difficult to impossible. * ADDITIONAL DETAILS...Expect 6 to 10 inches of snow at Snoqualmie Pass as temperatures will not fall below freezing until later Sunday morning.