EUGENE, Ore. - Dense fog will stick around until noon Wednesday, reducing visibility, trapping pollution and generating the potential for "freezing fog" where temperatures slip below 32 F, the National Weather Service said.
Forecasters expect showers to push onshore overnight. As the two weather systems mix, an precipitation will likely fall as freezing rain through noon Wednesday before turning to rain that afternoon.
The likelihood of freezing rain prompted forecasters to issue a freezing rain advisory for 4 a.m. to noon Wednesday. Depending on what happens, families with school children should check for school delays and closures on Wednesday morning.
The rain and change in weather systems should clear out the fog, which has hung like a lid on a pot over the interior valleys of Western Oregon for the past week.
Even if rain replaces the fog, the change will benefit air quality.
The stagnant air traps wood smoke from stoves and fireplaces, creating a potential health risk. Air quality monitors recorded moderate air pollution in Eugene on Tuesday. The air in Oakridge is rate "unhealthy for sensitive groups."
Motorists should use caution when driving in foggy areas, as visibility could be reduced to less than 1/4 mile in spots.