Oregon – Fog clings low to the ground across the southern Willamette Valley this morning, muting headlights and dulling the winter landscape. The air feels heavy and still, with little movement to clear it out.
According to the National Weather Service in Portland, an Air Stagnation Advisory remains in effect for Eugene and surrounding areas through Friday afternoon. Calm winds and a temperature inversion are trapping pollutants near the surface, allowing fog and reduced air quality to linger longer than usual.
Visibility around Eugene has dropped to around one-quarter mile at times, especially near sunrise. Patchy fog continues to form overnight and during early morning hours, creating hazardous travel conditions on city streets and nearby highways, including sections of I-5 and Highway 99. To be fair, conditions may improve briefly during midday, but fog can redevelop quickly after sunset.
Today turns mostly sunny once fog lifts, with highs reaching the lower 60s. Tonight brings another round of patchy fog as temperatures fall back into the mid-30s. Thursday starts similarly, with pockets of dense fog and patchy frost before sunshine returns by late morning.
The stagnant pattern keeps air quality concerns elevated for sensitive groups. Residents are encouraged to limit outdoor burning and reduce vehicle use when possible. Drivers should slow down, use headlights in fog, and expect sudden visibility changes during commutes.
Looking ahead, Friday stays mild with highs near the low 60s, though fog may linger early again. Changes arrive over the weekend as clouds increase and rain chances develop by Saturday night into Sunday. That shift should help scour out the stagnant air.
Early next week trends cooler and wetter, with a more typical February pattern settling in. Until then, plan morning travel carefully. Are you dealing with fog or hazy air where you live this morning?
Five-Day Outlook for Eugene, Oregon
• Today: Fog early, then mostly sunny, high near 61
• Thursday: Patchy fog and frost early, high near 61
• Friday: Patchy fog early, mostly sunny, high near 62
• Saturday: Mostly cloudy, chance of rain late, high near 59
• Sunday: Rain likely, high near 51
