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* WHAT...Sneaker waves possible. * WHERE...North and Central Coast of Oregon, and South Washington Coast. * WHEN...Through this afternoon. * IMPACTS...Waves can run up significantly farther on a beach than normal, including over rocks and jetties. Sneaker waves can suddenly knock people off of their feet and quickly pull them into the frigid ocean which may lead to serious injury or drowning.. * ADDITIONAL DETAILS...Keep children and pets away from the surf zone. Keep off of jetties, rocks and logs near the surf zone. If you see someone swept into the sea do not swim in after them. Call 911 and keep an eye on them until help arrives.

* WHAT...Sneaker waves possible. * WHERE...North and Central Coast of Oregon, and South Washington Coast. * WHEN...Through this afternoon. * IMPACTS...Waves can run up significantly farther on a beach than normal, including over rocks and jetties. Sneaker waves can suddenly knock people off of their feet and quickly pull them into the frigid ocean which may lead to serious injury or drowning.. * ADDITIONAL DETAILS...Keep children and pets away from the surf zone. Keep off of jetties, rocks and logs near the surf zone. If you see someone swept into the sea do not swim in after them. Call 911 and keep an eye on them until help arrives.

* WHAT...Heavy snow at or above elevations greater than 2500 ft. Additional snow accumulations up to 4 to 8 inches. * WHERE...West Slopes North Central Cascades and Passes and West Slopes South Central Cascades and Passes. * WHEN...Until 10 AM PST this morning. * IMPACTS...Travel could be very difficult.

* WHAT...Heavy snow at or above elevations greater than 2500 ft. Additional snow accumulations up to 2 to 5 inches. * WHERE...West Slopes North Cascades and Passes. * WHEN...Until 10 AM PST this morning. * IMPACTS...Plan on slippery road conditions.

* WHAT...Heavy snow above 3500 feet. Additional snow accumulations up to 6 inches. * WHERE...South Washington Cascades. * WHEN...Until 4 PM PST this afternoon. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous.

* WHAT...Heavy snow above 3500 feet. Additional snow accumulations of 11 to 15 inches. * WHERE...Northern and Central Oregon Cascades. * WHEN...Until 4 PM PST this afternoon. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous.

* WHAT...Freezing rain above 1000 feet. Ice accumulations up to one tenth of an inch. * WHERE...Upper Hood River Valley. * WHEN...Until 10 AM PST this morning. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous.

* WHAT...Mixed precipitation. Additional snow accumulations up to one inch and ice accumulations around a light glaze. * WHERE...Lower Slopes of the Eastern Washington Cascades Crest. * WHEN...Until 4 PM PST this afternoon. * IMPACTS...Plan on slippery road conditions.

* WHAT...Heavy snow Above 4000 feet. Additional snow accumulations 8 to 15 inches. * WHERE...In Oregon, Northern Blue Mountains of Oregon. In Washington, Northwest Blue Mountains. * WHEN...Until 4 PM PST this afternoon. * IMPACTS...Travel could be difficult due to periods of moderate to heavy snow. * ADDITIONAL DETAILS...I-84 through the Blue Mountains, including Meacham, is expected to receive 4 to 8 inches of snow. Snow accumulation of up to 6 inches is expected below 4000 feet.

* WHAT...Heavy snow. Additional snow accumulations up to 6 inches. * WHERE...Upper Slopes of the Eastern Washington Cascades Crest. * WHEN...Until 4 PM PST this afternoon. * IMPACTS...Travel could be difficult due to periods of moderate to heavy snow.

* WHAT...Freezing rain. Additional ice accumulations around a light glaze. * WHERE...Foothills of the Blue Mountains of Washington. * WHEN...Until 10 AM PST this morning. * IMPACTS...Very slippery sidewalks, roads and bridges are possible. The hazardous conditions could impact the Monday morning commute.

* WHAT...Heavy mixed precipitation Above 4000 feet. Additional snow accumulations up to 10 inches and ice accumulations around a light glaze. * WHERE...East Slopes of the Oregon Cascades. * WHEN...Until 4 PM PST this afternoon. * IMPACTS...Periods of moderate and heavy snow will combine with low visibilities to create difficult driving conditions.

* WHAT...Snow. Total snow accumulations of 1 to 4 inches between 4000 and 4500 feet and 2 to 6 inches above 4500 feet. * WHERE...Ochoco-John Day Highlands. * WHEN...Until 4 PM PST this afternoon. * IMPACTS...Travel could be difficult due to periods of moderate to heavy snow.

* WHAT...Heavy snow Above 4000 feet. Additional snow accumulations 8 to 15 inches. * WHERE...In Oregon, Northern Blue Mountains of Oregon. In Washington, Northwest Blue Mountains. * WHEN...Until 4 PM PST this afternoon. * IMPACTS...Travel could be difficult due to periods of moderate to heavy snow. * ADDITIONAL DETAILS...I-84 through the Blue Mountains, including Meacham, is expected to receive 4 to 8 inches of snow. Snow accumulation of up to 6 inches is expected below 4000 feet.

* WHAT...Snow above 4000 feet. Additional snow accumulations up to 6 inches. * WHERE...Southern Blue Mountains of Oregon. * WHEN...Until 4 PM PST this afternoon. * IMPACTS...Travel could be difficult due to periods of moderate to heavy snow.

* WHAT...Snow and freezing rain. Snow accumulations of 1 to 3 inches. Ice accumulations around a light glaze. * WHERE...Grande Ronde Valley. * WHEN...Until 10 AM PST this morning. * IMPACTS...Very slippery sidewalks, roads and bridges are possible.

Rain and patchy freezing rain will continue across the Lower Columbia Basin and the Blue Mountain Foothills through early Monday morning. Temperatures are in the lower 30s, therefore drivers should expect black ice on the roadways. Avoid cruise control and maintain safe driving distances.

Rain and patchy freezing rain will continue across the Lower Columbia Basin and the Blue Mountain Foothills through early Monday morning. Temperatures are in the lower 30s, therefore drivers should expect black ice on the roadways. Avoid cruise control and maintain safe driving distances.

* WHAT...Visibility one quarter mile or less in freezing dense fog. * WHERE...Odessa, Ritzville, Rockford, Airway Heights, Fairfield, Davenport, Wilbur, Creston, Cheney, Spokane Valley, Grand Coulee, Harrington, Downtown Spokane, and Coulee City. * WHEN...Until 7 AM PST Monday. * IMPACTS...Low visibility in addition to patches of freezing drizzle could make driving conditions slick and hazardous.

Through midnight, areas of dense freezing fog will produce visibilities of 1/4 mile in the Central Columbia Basin and West Plains. This includes sections of Interstate 90 between Airway Heights and Ritzville and Highway 2 between Airway Heights and Wilbur. Weather spotters have confirmed visibility as low as 1/8 mile in the vicinity of Ritzville. Motorists should be prepared for rapidly changing conditions in visibility and allow extra time for travel tonight.