* 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.
* WHAT...Heavy snow expected. Total snow accumulations between 18
and 24 inches, except 6 to 12 inches for Holden Village and
Stehekin. Winds gusting as high as 35 mph.
* WHERE...Stevens Pass.
* WHEN...From 10 PM this evening to 4 PM PST Saturday.
* IMPACTS...Travel could be very difficult. The conditions could
impact the Friday morning and evening commutes.
* WHAT...Snow expected. Total snow accumulations between 1 and 3
inches. Locally higher amounts around 3 to 6 inches for Plain and
Mazama.
* WHERE...Bridgeport, Winthrop, Okanogan, Loup Loup Pass,
Conconully, Methow, Plain, Nespelem, Mazama, Tonasket, Omak,
Oroville, Mansfield, Twisp, Disautel Pass, Brewster, Leavenworth,
Badger Mountain Road, and Waterville.
* WHEN...From 10 PM this evening to 10 PM PST Friday.
* IMPACTS...Travel could be difficult. The conditions could impact
the Friday morning and evening commutes.
* WHAT...Snow expected. Total snow accumulations between 2 and 7
inches.
* WHERE...Boulder Creek Road, Wauconda, Sherman Pass, Republic,
Highway 20 Wauconda Summit, Inchelium, and Chesaw Road.
* WHEN...From 10 PM this evening to 10 PM PST Friday.
* IMPACTS...Travel could be difficult. The conditions could impact
the Friday morning and evening commutes.
* WHAT...Snow expected. Total snow accumulations between 2 and 7
inches in the valleys and 7 to 15 inches in the mountains.
* WHERE...Metaline, Northport, Colville, Metaline Falls, Tiger,
Orin-Rice Road, Springdale-Hunters Road, Deer Park, Kettle Falls,
Chewelah, Fruitland, Ione, Newport, and Flowery Trail Road.
* WHEN...From 10 PM this evening to 10 PM PST Friday.
* IMPACTS...Travel could be difficult. The conditions could impact
the Friday morning and evening commutes.
* WHAT...Snow expected. Total snow accumulations up to two inches.
* WHERE...Potlatch, Spokane Valley, Rosalia, Oakesdale, Rockford,
Worley, La Crosse, Colfax, Pullman, Tekoa, Downtown Spokane,
Uniontown, Moscow, Airway Heights, Fairfield, Davenport, Genesee,
Hayden, Plummer, Post Falls, Cheney, and Coeur d'Alene.
* WHEN...From 4 AM to 1 PM PST Friday.
* IMPACTS...Plan on slippery road conditions. The conditions could
impact the Friday morning commute.
* WHAT...Mixed precipitation expected. Total snow accumulations up
to two inches and ice accumulations around a light glaze to 0.10
inches.
* WHERE...Ritzville, Odessa, Creston, Harrington, Wilbur, Grand
Coulee, Quincy, Ephrata, Coulee City, Moses Lake, and Othello.
* WHEN...From 10 PM this evening to 10 AM PST Friday.
* IMPACTS...Plan on slippery road conditions. The conditions could
impact the Friday morning commute.
* ADDITIONAL DETAILS...The greatest chance for freezing rain is
along I-90 from Vantage to Moses Lake.
* WHAT...Stagnant conditions will have potential to trap pollutants
near the ground with deteriorated air quality.
* WHERE...Craigmont, Winchester, Kamiah, Peck, Lapwai, Lewiston,
Nezperce, Gifford, Soldiers Meadow Road, Alpowa Summit, Clarkston,
Pomeroy, Culdesac, and Lewiston Grade.
* WHEN...Until 4 AM PST Friday.
* IMPACTS...Periods of air stagnation can lead to the buildup of
pollutants near the surface.
* WHAT...Stagnant air conditions will have potential to trap
pollutants near the ground.
* WHERE...Portions of North Idaho and Central, North Central, and
Northeast Washington.
* WHEN...Until 4 AM PST Friday.
* IMPACTS...Periods of air stagnation can lead to the buildup of
pollutants near the surface.
* WHAT...Heavy snow possible. Total snow accumulations between 18
and 30 inches possible at Stevens Pass. 6 to 12 inches Stehekin
and Holden Village.
* WHERE...Stevens Pass, Stehekin, and Holden Village.
* WHEN...From this evening through Saturday afternoon.
* IMPACTS...Motorists should be prepared for winter driving
conditions with accumulations up to an inch per hour Friday
morning through Friday evening.
* WHAT...Heavy snow possible. Total snow accumulations between 3 to
8 inches in the valleys and 1 to 2 feet in the mountains.
* WHERE...Tiger, Athol, Flowery Trail Road, Bonners Ferry, Metaline
Falls, Priest River, Colville, Metaline, Springdale-Hunters Road,
Fruitland, Newport, Schweitzer Mountain Road, Northport, Chewelah,
Kettle Falls, Ione, Eastport, Sandpoint, Clark Fork, Orin-Rice
Road, and Deer Park.
* WHEN...From late tonight through Saturday afternoon.
* IMPACTS...Be prepared for snowy travel during the Friday morning
commute. Snow will increase again Friday afternoon and evening.
* ADDITIONAL DETAILS...Lowland snow accumulations have the potential
to be widely variable with some locations in southern parts of
Stevens and Pend Orielle counties receiving a couple inches of wet
snow while lowland spots in the northern parts of the county have
the chance for 8 inches or more. Precipitation type could
fluctuate Friday afternoon and evening from heavy wet snow to rain
and back. High precipitation intensities could create heavy wet
snow accumulations near one inch per hour.
* 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 this evening through Saturday afternoon.
* IMPACTS...Roads, and especially bridges and overpasses, will
likely become slick and hazardous.
* ADDITIONAL DETAILS...Snow levels will start around 4000-5000 ft
Thursday evening into Friday, before lowering to 3000-3500 ft
Friday night.
* 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 this evening through Saturday afternoon.
* IMPACTS...Roads, and especially bridges and overpasses, will
likely become slick and hazardous.
* ADDITIONAL DETAILS...Snow levels will start around 4000-5000 ft
Thursday evening into Friday, before lowering to 3000-3500 ft
Friday night.
* WHAT...Heavy snow possible at or above elevations greater than
3000 ft. Total snow accumulations between 12 and 30 inches
possible.
* WHERE...West Slopes North Cascades and Passes, West Slopes North
Central Cascades and Passes, and West Slopes South Central
Cascades and Passes.
* WHEN...From this evening through Saturday afternoon.
* 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...Poor air quality will continue. This is due to an inversion
and stagnant air conditions near the surface that will continue to
trap pollutants.
* WHERE...Portions of central, north central, and northeast Oregon
and central, south central, and southeast Washington.
* WHEN...Until 4 AM PST Friday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
* WHAT...Poor air quality will continue. This is due to an inversion
and stagnant air conditions near the surface that will continue to
trap pollutants.
* WHERE...Portions of central, north central, and northeast Oregon
and central, south central, and southeast Washington.
* WHEN...Until 4 AM PST Friday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
* WHAT...Heavy snow possible. Total snow accumulations of 8 to 18
inches possible, heaviest above 3000 feet. Winds could gust as
high as 40 mph.
* WHERE...Upper Slopes of the Eastern Washington Cascades Crest.
* WHEN...From this evening through Saturday afternoon.
* IMPACTS...Heavy snowfall and very low visibility will create
dangerous driving conditions.
* ADDITIONAL DETAILS...Snow levels will start around 2500 to 3500
feet Thursday night before rising to 4000 feet Friday afternoon.
Snow levels will then lower to 1500 to 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 Friday night.
* WHAT...Heavy snow possible. Total snow accumulations between 6 and
12 inches possible. Winds could gust as high as 40 mph.
* WHERE...Northern Blue Mountains of Oregon and Washington above
4000 feet.
* WHEN...From late tonight through Saturday afternoon.
* IMPACTS...Roads, and especially bridges and overpasses, will
likely become slick and hazardous. Periods of moderate and heavy
snow will combine with low visibilities to create difficult
driving conditions.
* ADDITIONAL DETAILS...Total snowfall accumulations for I-84 along
the Blue Mountains, including Meacham, are only expected to be
around 3 to 5 inches.
* WHAT...Heavy snow possible. Total snow accumulations of 6 to 12
inches possible, heaviest above 4000 to 4500 feet. Winds could
gust as high as 40 mph.
* WHERE...East Slopes of the Oregon Cascades.
* WHEN...From this evening through Saturday afternoon.
* 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...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.
* WHAT...Heavy snow possible. Total snow accumulations between 6 and
12 inches possible. Winds could gust as high as 40 mph.
* WHERE...Northern Blue Mountains of Oregon and Washington above
4000 feet.
* WHEN...From late tonight through Saturday afternoon.
* IMPACTS...Roads, and especially bridges and overpasses, will
likely become slick and hazardous. Periods of moderate and heavy
snow will combine with low visibilities to create difficult
driving conditions.
* ADDITIONAL DETAILS...Total snowfall accumulations for I-84 along
the Blue Mountains, including Meacham, are only expected to be
around 3 to 5 inches.