* WHAT...For the Winter Storm Warning at or above elevations greater
than 3500 ft, heavy snow. Additional snow accumulations of up to 5
inches. For the Winter Weather Advisory at or above elevations
greater than 3500 ft, snow expected. Total snow accumulations
between 6 and 18 inches.
* WHERE...West Slopes North Cascades and Passes.
* WHEN...For the Winter Storm Warning, until 4 PM PST this
afternoon. For the Winter Weather Advisory, from 4 PM Friday to 4
PM PST Saturday.
* IMPACTS...Travel could be very difficult to impossible. Gusty
winds could bring down tree branches.
* WHAT...For the Winter Storm Warning at or above elevations greater
than 3500 ft, heavy snow. Additional snow accumulations up to 4
inches. For the Winter Weather Advisory at or above elevations
greater than 3500 ft, snow expected. Total snow accumulations
between 6 and 22 inches. Heaviest snow above 5000 feet.
* WHERE...West Slopes North Central Cascades and Passes and West
Slopes South Central Cascades and Passes.
* WHEN...For the Winter Storm Warning, until 4 PM PST this
afternoon. For the Winter Weather Advisory, from 1 AM Friday to 4
PM PST Saturday.
* IMPACTS...Travel could be very difficult to impossible. Gusty
winds could bring down tree branches.
* ADDITIONAL DETAILS...Snowfall amounts tonight through Saturday for
Snoqualmie Pass ranging 2 to 6 inches.
* WHAT...For the Winter Storm Warning at or above elevations greater
than 3500 ft, heavy snow. Additional snow accumulations of up to 5
inches. For the Winter Weather Advisory at or above elevations
greater than 3500 ft, snow expected. Total snow accumulations
between 6 and 18 inches.
* WHERE...West Slopes North Cascades and Passes.
* WHEN...For the Winter Storm Warning, until 4 PM PST this
afternoon. For the Winter Weather Advisory, from 4 PM Friday to 4
PM PST Saturday.
* IMPACTS...Travel could be very difficult to impossible. Gusty
winds could bring down tree branches.
* WHAT...Snow expected above 4000 feet. From 4000 feet to 5000 feet,
total snow accumulations appear most likely to range between 3 and
12 inches, with the lowest amounts near 4000 feet. Above 5000-5500
feet, total snow accumulations of 12 to 18 inches.
* WHERE...South Washington Cascades and the Northern and Central
Cascades of Oregon.
* WHEN...Until 7 PM PST Friday.
* IMPACTS...Travel could be difficult at times. Be prepared for snow
covered roads and slick surfaces.
* ADDITIONAL DETAILS...An active storm track will continue to
produce accumulating snow across the passes in the Cascades into
this weekend. However, there are two time periods when snow levels
appear likely to rise to 5000-5500 feet and be far enough above
the passes to temporarily limit snow accumulations. The first
window where snow levels will rise above the passes appears most
likely to occur between 3 AM Friday and 9 AM Friday. Another round
of warmer air aloft will most likely push snow levels above the
passes Friday night as well.
* WHAT...Snow expected above 4000 feet. From 4000 feet to 5000 feet,
total snow accumulations appear most likely to range between 3 and
12 inches, with the lowest amounts near 4000 feet. Above 5000-5500
feet, total snow accumulations of 12 to 18 inches.
* WHERE...South Washington Cascades and the Northern and Central
Cascades of Oregon.
* WHEN...Until 7 PM PST Friday.
* IMPACTS...Travel could be difficult at times. Be prepared for snow
covered roads and slick surfaces.
* ADDITIONAL DETAILS...An active storm track will continue to
produce accumulating snow across the passes in the Cascades into
this weekend. However, there are two time periods when snow levels
appear likely to rise to 5000-5500 feet and be far enough above
the passes to temporarily limit snow accumulations. The first
window where snow levels will rise above the passes appears most
likely to occur between 3 AM Friday and 9 AM Friday. Another round
of warmer air aloft will most likely push snow levels above the
passes Friday night as well.
* WHAT...Snow expected. Total snow accumulations between 12 to 20
inches, with up to 30 inches near Crater Lake and Mount Shasta Ski
area. Winds gusting as high as 70 mph.
* WHERE...The southern Oregon Cascades north of Highway 140
including Crater Lake National Park, highways 62, 138, and 51 at
Willamette Pass. Marble Mountains including Sawyer Bar Road near
Mount Etna, and the pass at Snowmans Hill Summit.
* WHEN...Until 10 AM PST Friday.
* IMPACTS...Travel could be very difficult to impossible. The
hazardous conditions could impact this evening and the Thursday
morning commutes. Very strong winds could cause extensive damage
to trees and power lines.
* WHAT...Snow. Total snow accumulations between 3 to 8 inches with
higher amounts of 8 to 14 inches above 5000 feet elevation. Winds
gusting as high as 35 mph in the valleys and 60 mph over the
mountains.
* WHERE...Northern and Eastern Klamath County and Western Lake
County County. This includes portions of Highway 97 north of
Chiloquin and Highway 140 between Dairy and Lakeview.
* WHEN...Until 4 AM PST Friday.
* IMPACTS...Travel could be very difficult. The hazardous conditions
could impact the Thursday evening commute. Strong winds could
cause extensive damage to trees and power lines.
* ADDITIONAL DETAILS...Snow levels will fluctuate between 4000 and
5000 feet. Periods of moderate snow are likely tonight and
Thursday morning and again Thursday evening through early Friday
morning.
* WHAT...Heavy snow. Additional snow accumulations between 2 and 8
inches. Winds gusting as high as 50 mph mainly on the ridgetops.
* WHERE...Holden Village, Stevens Pass, and Stehekin.
* WHEN...Until 10 PM PST this evening.
* IMPACTS...Travel could be very difficult leading up to and over
Stevens Pass. Heavy snow could lead to isolated tree damage and
power outages. Areas of blowing snow could significantly reduce
visibility where westerly winds align with the terrain.
ESFPQR
A series of systems will continue the wet weather pattern of late
across northwest Oregon through the weekend. This will lead to rises
on rivers and creeks through at least Sunday, December 29th. There
is currently a 30-50% probability that several rivers in northwest
Oregon including the Siuslaw River, the Mohawk River, the Marys
Rivers, the Luckiamute River and the Pudding River will reach minor
flood stage over the next week.
Heavy rainfall may also lead to ponding of water, general lowland
flooding and localized urban flooding, especially in low lying areas
or other areas with poor drainage. Heavy rainfall will also increase
the potential for landslides and debris flows in areas of steep
terrain.
The exact track of these upcoming storms will influence rainfall
amounts, and thus the potential for flooding. There is a 10% chance
that the southern Willamette Valley receives 2-3" of rain and the
adjacent higher terrain of the Coast Range and Cascades receive 3-5"
of rain late Saturday into early Sunday. This scenario would likely
produce more widespread flooding issues. Shifts in storm track
can change the current outlook, so be sure to monitor
weather.gov/portland for the latest weather updates, as well as any
watches, warnings, or advisories that may be issued. To view the
latest river forecasts, visit water.noaa.gov/wfo/pqr.
* WHAT...Large waves and hazardous surf conditions. Breakers up to
25 to 30 feet.
* WHERE...North and Central Coast of Oregon, and South
Washington Coast.
* WHEN...Until 4 PM PST Friday.
* IMPACTS...Destructive waves may wash over beaches, jetties,
and other structures unexpectedly. People can be swept off
rocks and jetties and drown while observing high surf. Minor
beach erosion may damage coastal properties and buildings.
Higher than normal water run-up is expected on beaches and low-
lying shoreline.
* ADDITIONAL DETAILS...Sneaker waves may be possible at times.
* WHAT...Large waves and hazardous surf conditions. Breakers up to
25 to 30 feet.
* WHERE...North and Central Coast of Oregon, and South
Washington Coast.
* WHEN...Until 4 PM PST Friday.
* IMPACTS...Destructive waves may wash over beaches, jetties,
and other structures unexpectedly. People can be swept off
rocks and jetties and drown while observing high surf. Minor
beach erosion may damage coastal properties and buildings.
Higher than normal water run-up is expected on beaches and low-
lying shoreline.
* ADDITIONAL DETAILS...Sneaker waves may be possible at times.
* WHAT...Large breaking waves of 17 to 22 feet in the surf zone.
* WHERE...North Coast zone.
* WHEN...Until 10 AM PST Friday.
* IMPACTS...Large waves may wash over beaches, jetties, and other
structures unexpectedly. Localized beach erosion is possible.
People can be swept off rocks and jetties, and drown while
observing high surf.
* WHAT...Southwest winds 30 to 40 mph with gusts of 50 to 70 mph
possible.
* WHERE...Lake County and eastern Klamath County, Central Siskiyou
County, Northeast Siskiyou and Northwest Modoc Counties, Modoc
County, Curry County Coast, Central Douglas County, Eastern Curry
County and Josephine County, and Jackson County.
* WHEN...From 10 PM this evening to 10 AM PST Friday.
* IMPACTS...Gusty winds will blow around unsecured objects. Tree
limbs could be blown down and a few power outages may result.
The following message is transmitted at the request of the
Wallowa Avalanche Center.
...The Wallowa Avalanche Center in La Grande OR has issued a
BACKCOUNTRY AVALANCHE WARNING...
* WHAT...Dangerous avalanche conditions exist today in the winter
recreation areas out of Halfway, Oregon. Rapid snow loading
combined with strong wind will create conditions likely to
produce natural and human avalanches.
* WHERE...The Southern Wallowas, primarily riding areas near and
around Cornucopia, Norway Basin, Fish Lake, and Clear Creek Snopark.
* WHEN...in effect from Thu 07:00AM PST until Fri 07:00AM PST.
* IMPACTS...Recent heavy snow combined with wind will likely
create widespread areas of unstable snow.
* WHAT...Large breaking waves of 17 to 22 feet in the surf zone.
* WHERE...North Coast zone.
* WHEN...Until 10 AM PST Friday.
* IMPACTS...Large waves may wash over beaches, jetties, and
other structures unexpectedly. Localized beach erosion is
possible. People can be swept off rocks and jetties, and drown
while observing high surf.
* ADDITIONAL DETAILS...The threat for coastal flooding has
decreased this morning as the high tide as passed, so the
coastal flood advisory has been cancelled. High surf conditions
will continue through Friday morning.
* WHAT...Large breaking waves of 17 to 22 feet in the surf zone.
* WHERE...Central Coast zone.
* WHEN...Until 10 AM PST Friday.
* IMPACTS...Large waves may wash over beaches, jetties, and
other structures unexpectedly. Localized beach erosion is
possible. People can be swept off rocks and jetties, and drown
while observing high surf.
* ADDITIONAL DETAILS...The threat for coastal flooding has
decreased this morning as the high tide as passed, so the
coastal flood warning has been cancelled. High surf conditions
will continue through Friday morning.
* WHAT...Minor coastal flooding. Inundation of around 2.0 to 2.2
feet above ground level is possible along shorelines and low-
lying coastal areas.
* WHERE...Eastern Strait of Juan de Fuca and Western Strait of
Juan De Fuca zones.
* WHEN...Until 2 PM PST this afternoon.
* IMPACTS...Minor coastal flooding due to tidal overflow is
expected around high tide. This may lead to flooding of
parking lots, parks, and roads, with only isolated road
closures expected.
The following message is transmitted at the request of the
Wallowa Avalanche Center.
...The Wallowa Avalanche Center in La Grande OR has issued a
BACKCOUNTRY AVALANCHE WARNING...
* WHAT...Dangerous avalanche conditions exist today in the winter
recreation areas out of Halfway, Oregon. Rapid snow loading
combined with strong wind will create conditions likely to
produce natural and human avalanches.
* WHERE...The Southern Wallowas, primarily riding areas near and
around Cornucopia, Norway Basin, Fish Lake, and Clear Creek .
* WHEN...in effect from Thu 07:00AM PST until Fri 07:00AM PST.
* IMPACTS...Recent heavy snow combined wtih wind will likely
create widespread areas of unstable snow.
* WHAT...Southwest winds 15 to 30 mph with gusts 40 to 55 mph.
* WHERE...Colfax, Moscow, Airway Heights, Grand Coulee, Spokane
Valley, Genesee, Post Falls, Potlatch, Fairfield, Odessa, Fourth
Of July Pass, Oakesdale, Fernwood, La Crosse, Coulee City, Cheney,
St. Maries, Coeur d'Alene, Ritzville, Pullman, Creston, Plummer,
Uniontown, Lookout Pass, Downtown Spokane, Osburn, Mullan, Worley,
Dobson Pass, Pinehurst, Wilbur, Hayden, Davenport, Wallace,
Rockford, Rosalia, Kellogg, Tekoa, and Harrington.
* WHEN...Until 5 PM PST this afternoon.
* IMPACTS...Gusty winds will blow around unsecured objects. Some
tree damage is possible along with a few power outages.
* ADDITIONAL DETAILS...Peak wind gusts are expected Thursday morning
and early afternoon then slowly decreasing Thursday near sunset.
* WHAT...Southwest winds 25 to 35 mph with gusts up to 55 mph. Wind
gusts near 30 mph in Clarkston.
* WHERE...Clarkston, Pomeroy, and Alpowa Summit.
* WHEN...Until 5 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.