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* WHAT...Snow. Additional snow accumulations of 4 to 10 inches above 4000 feet. Winds gusting as high as 45 mph with blowing snow. * WHERE...In Oregon, Northern Blue Mountains of Oregon. In Washington, Northwest Blue Mountains. * WHEN...Until 4 PM PST Thursday. * 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...Heavy snow. Additional snow accumulations of 3 to 9 inches above 3500 feet. Winds gusting as high as 40 mph with blowing snow. * WHERE...Lower Slopes of the Eastern Washington Cascades Crest. * WHEN...Until 10 AM PST Thursday. * 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.

* WHAT...Wet snow. Additional snow accumulations of one-half inch to two inches. * WHERE...Kittitas Valley. * WHEN...Until 4 AM PST Thursday. * IMPACTS...Even light snowfall amounts can accumulate on roads and cause dangerous driving conditions due to slippery and snow-covered roads.

* WHAT...Heavy snow. Additional snow accumulations of 6 to 10 inches above 4000 feet. Winds gusting as high as 55 mph with blowing snow. * WHERE...East Slopes of the Oregon Cascades. * WHEN...Until 10 PM PST Thursday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Periods of moderate and heavy snow will combine with low visibilities to create difficult driving conditions. Strong winds could cause extensive damage to trees and power lines.

* WHAT...Snow. Additional snow accumulations of 4 to 6 inches. Winds gusting as high as 50 mph. * WHERE...Southern Blue Mountains of Oregon. * WHEN...Until 4 PM PST Thursday. * IMPACTS...Plan on slippery road conditions. Gusty winds could bring down tree branches.

* WHAT...Snow. Additional snow accumulations of 2 to 4 inches above 4500 feet and up to 2 inches between 4000 and 4500 feet. Winds gusting as high as 50 mph with blowing snow. * WHERE...Ochoco-John Day Highlands. * WHEN...Until 4 PM PST Thursday. * IMPACTS...Travel could be difficult due to periods of moderate to heavy snow. Gusty winds could bring down tree branches.

* WHAT...Snow. Additional snow accumulations of 4 to 10 inches above 4000 feet. Winds gusting as high as 45 mph with blowing snow. * WHERE...In Oregon, Northern Blue Mountains of Oregon. In Washington, Northwest Blue Mountains. * WHEN...Until 4 PM PST Thursday. * 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...South winds of 20 to 30 mph with gusts 45 to 55 mph tonight. After 3 am Thursday, winds will become west to southwest 20 to 30 mph with gusts 55 to 65 mph. These strong winds will be primarily across the higher terrain. Winds will gradually ease after 8 am. * WHERE...Willapa Hills. * WHEN...Until 10 AM PST Thursday. * IMPACTS...Damaging winds could blow down trees and power lines. Some power outages are expected. Travel will be difficult, especially for high profile vehicles.

* WHAT...South winds 20 to 30 mph with gusts 55 to 65 mph are expected along the headlands and open exposed areas like the beaches. Elsewhere, expect gusts of 45 to 55 mph. * WHERE...In Oregon, Clatsop County Coast. In Washington, South Washington Coast. * WHEN...Until 8 AM PST Thursday. * IMPACTS...Damaging winds could blow down trees and power lines. Some power outages are expected. Travel will be difficult, especially for high profile vehicles. * ADDITIONAL DETAILS...EExpect two bursts of strong winds. First, ahead of the cold front as it moves ashore around 2 am Thursday. Then, winds ease a bit, then another burst of strong west to southwest winds from 4 to 8 am as low pressure north of the region moves inland.

* WHAT...Winds will increase through 1 am Thursday, becoming south to southwest 15 to 30 mph, with gusts 35 to 50 mph. Winds will gradually ease after 6 am. * WHERE...Central and Southern Willamette Valley, Tualatin Valley, Portland West Hills and Chehalem Mountain, Inner Portland Metro, North Clark County Lowlands, and Inner Vancouver Metro. * WHEN...Until 6 AM PST Thursday. * 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 55 to 65 mph, with strongest winds along the headlands and open exposed areas like the beaches. * WHERE...Tillamook County Coast and Central Coast of Oregon. * WHEN...Until 8 AM PST Thursday. * IMPACTS...Damaging winds could blow down trees and power lines. Some power outages are expected. Travel will be difficult, especially for high profile vehicles.

* WHAT...South winds 20 to 30 mph with gusts 55 to 65 mph are expected along the headlands and open exposed areas like the beaches. Elsewhere, expect gusts of 45 to 55 mph. * WHERE...In Oregon, Clatsop County Coast. In Washington, South Washington Coast. * WHEN...Until 8 AM PST Thursday. * IMPACTS...Damaging winds could blow down trees and power lines. Some power outages are expected. Travel will be difficult, especially for high profile vehicles. * ADDITIONAL DETAILS...EExpect two bursts of strong winds. First, ahead of the cold front as it moves ashore around 2 am Thursday. Then, winds ease a bit, then another burst of strong west to southwest winds from 4 to 8 am as low pressure north of the region moves inland.

* WHAT...Winds will increase through 1 am Thursday, becoming south to southwest 15 to 30 mph, with gusts 35 to 50 mph. Winds will gradually ease after 6 am. * WHERE...Central and Southern Willamette Valley, Tualatin Valley, Portland West Hills and Chehalem Mountain, Inner Portland Metro, North Clark County Lowlands, and Inner Vancouver Metro. * WHEN...Until 6 AM PST Thursday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

* WHAT...Heavy snow. Additional snow accumulations of 4 to 12 inches above 3500 feet. Winds gusting as high as 40 mph with blowing snow. * WHERE...Upper Slopes of the Eastern Washington Cascades Crest. * WHEN...Until 10 PM PST Thursday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Significant snowfall with periods of heavy snowfall rates will combine with low visibility to create very difficult driving conditions.

* WHAT...Snow. Additional snow accumulations of 4 to 10 inches above 4000 feet. Winds gusting as high as 45 mph with blowing snow. * WHERE...In Oregon, Northern Blue Mountains of Oregon. In Washington, Northwest Blue Mountains. * WHEN...Until 4 PM PST Thursday. * 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. * ADDITIONAL DETAILS...Steady snow overnight will turn to snow showers Thursday morning and afternoon.

* WHAT...Heavy snow. Additional snow accumulations of 3 to 9 inches above 3500 feet. Winds gusting as high as 40 mph with blowing snow. * WHERE...Lower Slopes of the Eastern Washington Cascades Crest. * WHEN...Until 10 AM PST Thursday. * 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.

* WHAT...Wet snow. Additional snow accumulations of one-half inch to two inches. * WHERE...Kittitas Valley. * WHEN...Until 4 AM PST Thursday. * IMPACTS...Even light snowfall amounts can accumulate on roads and cause dangerous driving conditions due to slippery and snow-covered roads. * ADDITIONAL DETAILS...Snow is expected to transition to rain by early Thursday morning.

* WHAT...Heavy snow. Additional snow accumulations of 6 to 10 inches above 4000 feet. Winds gusting as high as 55 mph with blowing snow. * WHERE...East Slopes of the Oregon Cascades. * WHEN...Until 10 PM PST Thursday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Periods of moderate and heavy snow will combine with low visibilities to create difficult driving conditions. Strong winds could cause extensive damage to trees and power lines.

* WHAT...Snow. Additional snow accumulations of 4 to 10 inches above 4000 feet. Winds gusting as high as 45 mph with blowing snow. * WHERE...In Oregon, Northern Blue Mountains of Oregon. In Washington, Northwest Blue Mountains. * WHEN...Until 4 PM PST Thursday. * 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. * ADDITIONAL DETAILS...Steady snow overnight will turn to snow showers Thursday morning and afternoon.

* WHAT...Snow. Additional snow accumulations of 2 to 4 inches above 4500 feet and up to 2 inches between 4000 and 4500 feet. Winds gusting as high as 50 mph with blowing snow. * WHERE...Ochoco-John Day Highlands. * WHEN...Until 4 PM PST Thursday. * IMPACTS...Travel could be difficult due to periods of moderate to heavy snow. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...Steady snow overnight will turn to snow showers Thursday morning and afternoon.