Overview
- The National Weather Service issued a freezing fog advisory for parts of southwest Oregon until noon Friday, warning of visibility near a quarter mile and ice forming on contact.
- Oregon forecasters also cautioned about stagnant air under strong high pressure, noting trapped pollutants could degrade air quality for sensitive groups.
- In Pennsylvania, a Friday night alert covered dense fog near I-81 in Schuylkill County with visibility near or below a quarter mile and a brief improvement expected as a cold front passed.
- Earlier in the week, Alabama saw widespread Thursday-morning dense fog advisories across dozens of counties, with drivers warned to expect quarter-mile visibility or less.
- NWS guidance across affected areas continues to urge slower speeds, low-beam headlights, and extra following distance, with most fog lifting by late morning but likely to recur on subsequent mornings.