Cold weather advisory: Be Aware. A cold weather advisory is issued when seasonably cold air temperatures or wind chill values, but not extremely cold values, are expected or occurring. Be sure you and your loved ones dress appropriately and cover exposed skin when venturing outdoors.

The National Weather Service issued a cold weather advisory at 2:34 p.m. on Thursday valid from Friday 10 p.m. until Sunday 10 a.m. for South Central Oregon Cascades and Siskiyou Mountains and Southern Oregon Cascades.

But since then, things have dried out. National Weather Service meteorologist Chris Burling said Friday that overall, the Willamette Valley would continue to see cool and foggy weather for at least the next four to five days,

The advisories impact large areas of Idaho, Oregon, Montana and Washington, lasting through the end of January.

Rain and snow is returning to Oregon this weekend, and low elevation snow and ice will become possible next week.

The National Weather Service is warning of air stagnation and dense fog in the Willamette Valley. Advisories have been issued for both events. Dense fog is expected to persist until 1 p.m. Thursday in the central Willamette Valley,

The National Weather Service has simplified some of its winter weather alerts for Wind Chill and Extreme Cold Warnings.

Forecasters are warning that air pollution may become trapped and adversely affect humans, due to weather conditions in the U.S.

On Saturday at 1:56 a.m. the National Weather Service issued a cold weather advisory valid from 10 p.m. until Sunday 10 a.m. for North Oregon Coast Range Lowlands, Central Oregon Coast Range Lowlands,

Rain and snow is returning to Oregon this weekend, and low elevation snow and ice will become possible next week.

While no blockbuster storms are heading for the Northwest, some opportunities for rain and snow will return and storm travel issues may develop.

Due to the recent extended drying pattern and east winds in the forecast this weekend, the Oregon Department of Forestry is encouraging anyone who may have completed a debris or slash burn in the past few months to monitor and patrol the burn site.