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Patchy dense fog has been observed across portions of the Blue Mountain foothills with visibilities of one-quarter mile or less, primarily along the I-84 and OR-11 corridors. Motorists are urged to use caution if traveling in these areas as visibilities could change rapidly.

* WHAT...Heavy snow expected. Total snow accumulations between 8 to 18 inches, with local amounts up to 25 inches near Crater Lake. Winds gusting as high as 40 mph. * WHERE...The southern Oregon Cascades, this includes highway's 138, and 230 near Diamond Lake, highway 138 east of Diamond Lake. Highway 62 near Crater Lake, and highway 140 near Lake of the Woods. * WHEN...Until 4 PM PST Monday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the morning commute Sunday and Monday morning. * ADDITIONAL DETAILS...This will be a persistent long duration event with the highest concern for snow covered roads Sunday morning, and again around sunset Sunday until Monday afternoon. Also there is a good chance (70-90%) for snowfall rates of an inch per hour late Sunday afternoon through Sunday night.

Patchy dense fog is blanketing portions of the Blue Mountain foothills with visibility of one-quarter mile or less reported in some places, including along I-84 and OR-11. Be prepared for sudden changes in visibility, slow down, and use low-beam headlights if encountering dense fog.

Patchy dense fog is blanketing portions of the Blue Mountain foothills with visibility of one-quarter mile or less reported in some places, including along I-84 and OR-11. Be prepared for sudden changes in visibility, slow down, and use low-beam headlights if encountering dense fog.

* WHAT...Heavy mixed precipitation Above 3500 feet. Additional snow accumulations up to 14 inches and ice accumulations around a light glaze. * WHERE...South Washington Cascades. * WHEN...Until 4 PM PST Monday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous.

* WHAT...Heavy snow Above 3500 feet. Additional snow accumulations 1 to 2 feet. * WHERE...Northern and Central Oregon Cascades. * WHEN...Until 4 PM PST Monday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous.

* WHAT...Heavy snow. Additional snow accumulations of 3 to 12 inches, heaviest along the Cascade crest above 4000 feet. * WHERE...Upper Slopes of the Eastern Washington Cascades Crest. * WHEN...Until 4 PM PST Monday. * IMPACTS...Significant snowfall with periods of heavy snowfall rates will combine with low visibility to create very difficult driving conditions.

* WHAT...Heavy snow. Additional snow accumulations of 6 to 12 inches between 3500 to 4500 feet, and 12 to 24 inches above 4500 feet. * WHERE...In Oregon, Northern Blue Mountains of Oregon. In Washington, Northwest Blue Mountains. * WHEN...Until 4 PM PST Monday. * IMPACTS...Heavy snowfall and very low visibility will create extremely dangerous driving conditions.

* WHAT...Snow. Additional snow accumulations of one-half inch to two inches. * WHERE...Lower Slopes of the Eastern Washington Cascades Crest. * WHEN...Until 4 AM PST Monday. * IMPACTS...Plan on slippery road 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...From 4 PM this afternoon to 4 PM PST Monday. * IMPACTS...Travel could be difficult due to periods of moderate to heavy snow.

* WHAT...Snow. Total snow accumulations of 2 to 6 inches between 4000 and 4500 feet and 4 to 9 inches between 4500 and 5500 feet. * WHERE...Southern Blue Mountains of Oregon. * WHEN...From 4 PM this afternoon to 4 PM PST Monday. * IMPACTS...Periods of moderate and heavy snow will combine with low visibilities to create difficult driving conditions. * ADDITIONAL DETAILS...Snow accumulations of 8 to 16 inches are expected above 5500 feet.

* WHAT...Heavy snow. Additional snow accumulations of 8 to 24 inches above 4000 feet along the Cascade crest. * WHERE...East Slopes of the Oregon Cascades. * WHEN...Until 4 PM PST Monday. * IMPACTS...Significant snowfall with periods of heavy snowfall rates will combine with low visibility to create very difficult driving conditions. * ADDITIONAL DETAILS...Additional snow accumulations below 4000 feet within the zone are expected to be one-half inch to two inches.

* WHAT...Heavy snow. Additional snow accumulations of 6 to 12 inches between 3500 to 4500 feet, and 12 to 24 inches above 4500 feet. * WHERE...In Oregon, Northern Blue Mountains of Oregon. In Washington, Northwest Blue Mountains. * WHEN...Until 4 PM PST Monday. * IMPACTS...Heavy snowfall and very low visibility will create extremely dangerous driving conditions.

Patchy dense fog is blanketing portions of the Blue Mountain foothills with visibility of one-quarter mile or less reported in some places, including along I-84 and OR-11. Be prepared for sudden changes in visibility, slow down, and use low-beam headlights if encountering dense fog. Temperatures are below freezing in many locations so roadways may be slick.

Patchy dense fog is blanketing portions of the Blue Mountain foothills with visibility of one-quarter mile or less reported in some places, including along I-84 and OR-11. Be prepared for sudden changes in visibility, slow down, and use low-beam headlights if encountering dense fog. Temperatures are below freezing in many locations so roadways may be slick.

* WHAT...Heavy snow at or above elevations greater than 2500 ft. Additional snow accumulations of 8 to 14 inches. * WHERE...West Slopes North Central Cascades and Passes and West Slopes South Central Cascades and Passes. * WHEN...Until 10 AM PST Monday. * IMPACTS...Travel could be very difficult.

* WHAT...Heavy snow at or above elevations greater than 2500 ft. Additional snow accumulations of 5 to 10 inches. * WHERE...West Slopes North Cascades and Passes. * WHEN...Until 10 AM PST Monday. * IMPACTS...Travel could be very difficult.

* WHAT...Heavy snow. Additional snow accumulations 8 to 12 inches across the highest elevations. * WHERE...Mountain Road, Peola, Anatone, and Cloverland Road. * WHEN...Until 4 AM PST Tuesday. * IMPACTS...Travel could be very difficult.

* WHAT...Wet snow. Additional snow accumulations 2 to 5 inches. * WHERE...Uniontown, La Crosse, Pullman, Oakesdale, Rosalia, Tekoa, and Colfax. * WHEN...Until 10 PM PST Monday. * IMPACTS...Plan on slippery road conditions.

* WHAT...Heavy snow. Additional snow accumulations 6 to 10 inches near the Cascade crest. * WHERE...Stehekin, Stevens Pass, and Holden Village. * WHEN...Until 10 AM PST Monday. * IMPACTS...Expect winter driving conditions.