PORTLAND, OR — A dense, silvery fog clings to the banks of the Willamette River this morning, softening the skyline and swallowing bridges in mist. Traffic crawls along Interstate 5 as visibility drops below a quarter mile in spots — part of a Dense Fog Advisory stretching through 11 a.m. for much of northwest Oregon and southwest Washington.
Drivers heading through Portland, Salem, and Vancouver should keep headlights on low beam and leave extra distance on slick roads. The air remains cool at 41°F, with calm winds and high humidity locking in the haze.
By late morning, the fog will thin, but the calm won’t last. A strong Pacific system arrives late Saturday into Sunday, bringing widespread rain and gusty winds. Sunday looks especially wet, with 100% rain coverage and highs near 50°F. Puddling and wet leaves could make roads slippery for early Thanksgiving travelers heading out across I-84 or the coast range.
Rain continues into Monday, tapering to showers by afternoon, followed by another front midweek. Temperatures stay steady — highs in the upper 40s, lows in the upper 30s — keeping the region cool but above freezing. Across the U.S., models hint at a major cold front by Thanksgiving Day that could trigger snow and ice from the Rockies to the Northeast, likely affecting post-holiday travel nationwide.
