* 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.
* 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 this afternoon to 4 PM PST Sunday.
* IMPACTS...Periods of moderate and heavy snow will cause low
visibilities to create difficult driving conditions.
* WHAT...Freezing rain. Additional ice accumulations around a light
glaze. Winds gusting as high as 30 mph.
* WHERE...Kittitas Valley and Lower Slopes of the Eastern Washington
Cascades Crest.
* WHEN...Until 4 PM PST this afternoon.
* IMPACTS...Roads, and especially bridges and overpasses, will
likely become slick and hazardous.
* 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 this afternoon to 4 PM PST Sunday.
* IMPACTS...Periods of moderate and heavy snow will cause low
visibilities to create difficult driving conditions.
* WHAT...South winds 25 to 35 mph with gusts 45 to 50 mph expected
for 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...Visibility 1/2 mile or less in freezing fog.
* WHERE...Foothills of the Northern Blue Mountains of Oregon.
* WHEN...Until 11 AM PST this morning.
* IMPACTS...Low visibility could make driving conditions hazardous.
* ADDITIONAL DETAILS...Areas of dense fog, especially along
Interstate 84 around Pendleton, could make for hazardous driving
conditions. Additionally, below freezing temperatures may create
slick spots on roadways.
* WHAT...Visibility less than a quarter mile in freezing fog.
* WHERE...North Central Oregon.
* WHEN...Until 11 AM PST this morning.
* IMPACTS...Low visibility could make driving conditions hazardous.
* 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...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