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ESFSEW Additional frontal systems will bring precipitation to Western Washington at times through the weekend. While precipitation will be much less with the systems beginning Friday, the lack of much of a break will keep rivers over the Southwest Interior rising into the weekend. The potential for the lower reaches of the Chehalis River to flood on Saturday continues to be monitored. Please monitor the latest river forecasts from the National Weather Service for additional information.

...The Flood Warning is extended for the following rivers in Washington... Grays River at Covered Bridge near Rosburg affecting Wahkiakum County. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Grays River at Covered Bridge near Rosburg. * WHEN...Until late this evening. * 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 2:15 PM PST Thursday the stage was 28.7 feet. - Bankfull stage is 27.5 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 2:15 PM PST Thursday was 28.8 feet. - Forecast...The river will gradually fall below flood stage this evening. - Flood stage is 28.5 feet. - http://www.weather.gov/safety/flood

ESFSEW Additional frontal systems will bring precipitation to Western Washington at times through the weekend. While precipitation will be much less with the systems beginning Friday, the lack of much of a break will keep rivers over the Southwest Interior rising into the weekend. The potential for the lower reaches of the Chehalis River to flood on Saturday continues to be monitored. Please monitor the latest river forecasts from the National Weather Service for additional information.

* WHAT...Dangerously large breaking waves of 25 to 30 feet. * WHERE...South Central Oregon Coast and Curry County Coast. * WHEN...Until 7 AM PST Sunday. * 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 especially during high tides. Infrastructure damage and significant beach erosion can be expected. * ADDITIONAL DETAILS...Surf conditions will be occasionally worsened by high winds and seas as fronts pass each day through Sunday. * View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

* WHAT...Snow expected above 3500 feet. Total snow accumulations between 8 and 14 inches. 2 to 6 inches between 3000 and 4000 feet with the highest snow accumulations above pass level. * WHERE...Upper Slopes of the Eastern Washington Cascades Crest. * WHEN...From 1 AM Friday to 4 PM PST Saturday. * IMPACTS...Significant snowfall with periods of heavy snowfall rates will combine with low visibility to create very difficult driving conditions.

* WHAT...Wet snow expected above 4500 feet. Total snow accumulations 6 to 12 inches. * WHERE...In Oregon, Northern Blue Mountains of Oregon. In Washington, Northwest Blue Mountains. * WHEN...From 1 AM Friday to 4 AM PST Saturday. * IMPACTS...Periods of moderate and heavy snow will combine with low visibilities to create difficult driving conditions.

* WHAT...Wet snow expected above 4500 feet. Total snow accumulations 3 to 6 inches. * WHERE...Ochoco-John Day Highlands. * WHEN...From 1 AM Friday to 4 AM PST Saturday. * IMPACTS...Periods of moderate and heavy snow will combine with low visibilities to create difficult driving conditions.

* WHAT...Wet snow expected above 4500 feet. Total snow accumulations 6 to 12 inches. * WHERE...In Oregon, Northern Blue Mountains of Oregon. In Washington, Northwest Blue Mountains. * WHEN...From 1 AM Friday to 4 AM PST Saturday. * IMPACTS...Periods of moderate and heavy snow will combine with low visibilities to create difficult driving conditions.

* WHAT...Wet snow above 4500 feet. Snow accumulations 5 to 9 inches. * WHERE...East Slopes of the Oregon Cascades. * WHEN...Until 7 PM PST Friday. * IMPACTS...Periods of moderate and heavy snow will combine with low visibilities to create difficult driving conditions. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...Rising snow levels over late tonight into early morning could lead to a period of rain and snow mix or rain before returning to snow tomorrow when snow levels drop and conditions cool. This may also lead to icy conditions tomorrow.

* 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...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.