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* WHAT...Dangerously large breaking waves of 28 to 31 ft. * WHERE...The beaches and shorelines of Curry, Coos, and Douglas counties. * WHEN...Until 4 AM PST Tuesday. * IMPACTS...Extremely large breaking waves will create very hazardous conditions along beaches and area shorelines. Waves will inundate beaches and surge into normally dry areas. Infrastructure damage and significant beach erosion can be expected. * ADDITIONAL DETAILS...The highest surf is expected through this afternoon. Conditions are expected to slowly improve on Tuesday, but another round of dangerous surf conditions can be expected late Wednesday (Christmas Day) through Thursday, if not longer. * View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

* WHAT...Heavy snow possible. Total snow accumulations between 3 and 24 inches possible. Winds could gust as high as 65 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...From Wednesday late afternoon through Friday morning. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Travel could be very difficult to impossible. The hazardous conditions could impact the Wednesday evening and Thursday morning commutes. Very strong winds could cause extensive damage to trees and power lines.

* WHAT...Heavy wet snow possible above 4500 feet. Total snow accumulations of 1-2 feet. Winds could gust as high as 45 mph. * WHERE...South Washington Cascades and the Northern and Central Cascades of Oregon. * WHEN...From Wednesday afternoon through Friday morning. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Travel could be difficult and winter travel conditions should be anticipated. * ADDITIONAL DETAILS...Two rounds of higher intensity snowfall will most likely impact the Cascades later this week. The first round will most likely take place Wednesday evening into the early morning hours on Thursday. A second storm system will be quick on the first storm system heels, and bring another round of intense snowfall across the Cascades Thursday night into Friday morning. The Timberline Highway, US20 over Santiam Pass and Highway 58 over Willamette Pass will be the roadways most heavily impacted by the snow.

* WHAT...Heavy wet snow possible above 4500 feet. Total snow accumulations of 1-2 feet. Winds could gust as high as 45 mph. * WHERE...South Washington Cascades and the Northern and Central Cascades of Oregon. * WHEN...From Wednesday afternoon through Friday morning. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Travel could be difficult and winter travel conditions should be anticipated. * ADDITIONAL DETAILS...Two rounds of higher intensity snowfall will most likely impact the Cascades later this week. The first round will most likely take place Wednesday evening into the early morning hours on Thursday. A second storm system will be quick on the first storm system heels, and bring another round of intense snowfall across the Cascades Thursday night into Friday morning. The Timberline Highway, US20 over Santiam Pass and Highway 58 over Willamette Pass will be the roadways most heavily impacted by the snow.

* WHAT...Heavy snow possible. Total snow accumulations between 18 and 24 inches possible above 3500 feet. * WHERE...Stevens Pass, Holden Village, and Stehekin. * WHEN...From Wednesday afternoon through Friday morning. * IMPACTS...Travel could be very difficult over Stevens Pass. * ADDITIONAL DETAILS...Expect snowfall rates around 1 inch per hour or greater at Stevens Pass Wednesday night. For Coles Corner and Stehekin, total snow accumulations between 5 and 12 inches.

* WHAT...South winds 25 to 35 mph with gusts 45 to 55 mph expected for the base of the Blue Mountains of Washington. * WHERE...Foothills of the Blue Mountains of Washington. * WHEN...From 10 PM this evening to 7 AM PST Tuesday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

* WHAT...Visibility a quarter mile or less in dense fog. * WHERE...Kittitas Valley. * WHEN...Until 5 PM PST this afternoon. * IMPACTS...Low visibility could make driving conditions hazardous.

* WHAT...South winds 25 to 35 mph with gusts up to 55 mph expected, mainly south of La Grande. * WHERE...Grande Ronde Valley. * WHEN...From 10 PM this evening to 7 AM PST Tuesday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

* WHAT...South winds 20 to 30 mph with gusts 45 to 50 mph expected, primarily at the base of the Blue Mountains. * WHERE...Foothills of the Southern Blue Mountains of Oregon. * WHEN...From 10 PM this evening to 7 AM PST Tuesday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

* WHAT...South winds 30 to 40 mph with gusts 55 to 65 mph expected for the base of the northern Blue Mountains of Oregon. * WHERE...Foothills of the Northern Blue Mountains of Oregon. * WHEN...From 10 PM this evening to 7 AM PST Tuesday. * IMPACTS...Damaging winds will blow down trees and power lines. Travel will be difficult, especially for high profile vehicles. * ADDITIONAL DETAILS...Strong and damaging winds will be observed along Interstate 84 from Pendleton to Cabbage Hill, as well as Highway 11 from Pendleton to Milton-Freewater.

...The Flood Warning continues for the following rivers in Washington... Skokomish River At Potlatch affecting Mason County. .Minor flooding is occuring along the Skokomish River but will gradually recede below flood stage on Tuesday. Additional rounds of precipitation in the coming days will lead to additional flooding. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Skokomish River at Potlatch. * WHEN...Until tomorrow afternoon. * IMPACTS...At 16.5 feet, the Skokomish River will cause widespread flooding of pasture lands, with water flowing quickly over West Bourgault Road and Skokomish Valley Road. * ADDITIONAL DETAILS... - At 11:30 AM PST Monday the stage was 17.4 feet. - Flood stage is 16.5 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 11:30 AM PST Monday was 17.6 feet. - Forecast...The river is expected to fall below flood stage tomorrow morning and continue falling to 16.4 feet later Tuesday. - Flood History...This crest compares to a previous crest of 17.3 feet on 03/06/2014. - http://www.weather.gov/safety/flood

* WHAT...Large breaking waves of 18 to 22 feet in the surf zone. * WHERE...North Coast and Central Coast zones. * WHEN...Until 9 PM PST this evening. * 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...Waves just offshore will be long period with a dominant period of 20 to 22 seconds. This will enhance the risk for beach erosion and infrastructure damage on west or southwest facing beaches.

* WHAT...Southeast winds 15 to 25 mph with gusts up to 50 mph expected. * WHERE...East Puget Sound Lowlands. * WHEN...From 6 PM this evening to 2 AM PST Tuesday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...Winds will be strongest in areas near and west of the Cascade gaps including North Bend, Enumclaw, Gold Bar, and Covington.

* WHAT...South winds 25 to 35 mph with gusts up to 55 mph expected. * WHERE...This includes the Summer Lake area and the mountains across Lake County and eastern Klamath County, and Modoc County. * WHEN...From 7 PM this evening to 4 AM PST Tuesday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

* WHAT...Dense fog advisory will expire 10 AM. Southeast winds 20 to 30 mph with gusts up to 50 mph expected. * WHERE...For the Wind Advisory, southern Rogue Valley, including the city of Ashland, Talent and Phoenix. * WHEN...From 1 PM this afternoon to 8 PM PST this evening. * IMPACTS...Gusty winds will blow around unsecured objects this afternoon and evening. Tree limbs could be blown down and a few power outages may result.

* WHAT...South winds 25 to 35 mph with gusts 45 to 55 mph expected for the base of the Blue Mountains of Washington. * WHERE...Foothills of the Blue Mountains of Washington. * WHEN...From 10 PM this evening to 7 AM PST Tuesday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

* WHAT...Visibility a quarter mile or less in dense fog. * WHERE...Eastern Columbia River Gorge of Oregon and Washington, and Kittitas Valley. * WHEN...Until 1 PM PST this afternoon. * IMPACTS...Low visibility could make driving conditions hazardous.

* WHAT...South winds 20 to 30 mph with gusts 45 to 50 mph expected, particularly at the base of the Blue Mountains. * WHERE...Foothills of the Southern Blue Mountains of Oregon. * WHEN...From 10 PM this evening to 7 AM PST Tuesday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

* WHAT...South winds 25 to 35 mph with gusts up to 55 mph expected, mainly south of La Grande. * WHERE...Grande Ronde Valley. * WHEN...From 10 PM this evening to 7 AM PST Tuesday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

* WHAT...South winds 30 to 40 mph with gusts 55 to 65 mph expected for the base of the northern Blue Mountains of Oregon. * WHERE...Foothills of the Northern Blue Mountains of Oregon. * WHEN...From 10 PM this evening to 7 AM PST Tuesday. * IMPACTS...Damaging winds will blow down trees and power lines. Travel will be difficult, especially for high profile vehicles. * ADDITIONAL DETAILS...Strong and damaging winds will be observed along Interstate 84 from Pendleton to Cabbage Hill, as well as Highway 11 from Pendleton to Milton-Freewater.