Multiple winter weather advisories have been issued for the Cascade Foothills, Oregon Coast Range, and Cascades as forecasters predict significant snowfall this week. Mt. Hood could receive up to 2 feet of snow, while the South Cascades and Willapa Hills area are also under advisories. The National Weather Service warns of heavy snow accumulation in the Cascade passes from Monday through Thursday, with Portland residents potentially seeing snow as temperatures drop. Despite a mild start to the week with mainly dry conditions, the weather is expected to turn, and snow levels could drop significantly, impacting the Willamette Valley. Rain showers are anticipated over the weekend, but the snow is likely to return as the coldest air of the season approaches the region.