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* 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.

...The National Weather Service in Portland OR has issued a Flood Warning for the following rivers in Washington... Grays River at Covered Bridge near Rosburg affecting Wahkiakum County. * WHAT...Minor flooding is occurring. * WHERE...Grays River at Covered Bridge near Rosburg. * WHEN...From this morning to late this afternoon. * IMPACTS...Above 28.5 feet, expect some flooding of roads along and near the Grays River, especially downstream of the gage, including roadway approaches to the Altoona Bridge over the Grays, and portions of Covered Bridge Road, Barr-Durrah Road, and Loop Road near Rosburg and Hwy 4. * ADDITIONAL DETAILS... - At 9:15 AM PST Thursday the stage was 28.6 feet. - Bankfull stage is 27.5 feet. - Forecast...The river will crest around 28.8 feet late this morning. It will fall below flood stage early this afternoon and continue to drop through the rest of the day. - Flood stage is 28.5 feet. - http://www.weather.gov/safety/flood

* WHAT...Heavy snow above 3500 feet. Additional snow accumulations up to 6 inches. Winds gusting as high as 45 mph. * WHERE...Upper Slopes of the Eastern Washington Cascades Crest. * WHEN...Until 10 PM PST this evening. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Travel could be difficult due to periods of moderate to heavy snow. Gusty winds could bring down tree branches.

* WHAT...Snow above 4000 feet. Additional snow accumulations up to two inches. Winds gusting as high as 45 mph. * WHERE...In Oregon, Northern Blue Mountains of Oregon. In Washington, Northwest Blue Mountains. * WHEN...Until 4 PM PST this afternoon. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Plan on slippery road conditions. Gusty winds could bring down tree branches.

* WHAT...Heavy wet snow above 4000 feet. Additional snow accumulations up to 6 inches. Winds gusting as high as 45 mph with blowing snow. * WHERE...East Slopes of the Oregon Cascades. * WHEN...Until 10 PM PST this evening. * IMPACTS...Travel could be difficult due to periods of moderate to heavy snow. Widespread blowing snow could significantly reduce visibility. Gusty winds could bring down tree branches.