Areas of freezing fog Monday morning may cause ice to form on roads and sidewalks, making for hazardous travel conditions, National Weather Service forecasters say.
In a short-term forecast notice issued Monday morning, forecasters added that the fog may be dense in spots. They urged commuters to slow down and allow a little extra time and to be alert to the possibility of icy surfaces.
In the meantime, the air stagnation advisory in the mid-valley remains in effect through noon Tuesday.
Forecasters said air quality may deteriorate through the day due to stagnant area. The state Department of Environmental Quality offers updated air quality information at the website https://oraqi.deq.state.or.us/home/map.
Smoke from wood stoves and pile burns will have difficulty dispersing. Diminished air quality could affect health, especially for people with respiratory sensitivities. People with respiratory illness should follow their physician's advice for dealing with high levels of air pollution.
An air stagnation advisory is issued when, due to limited movement of an air mass across the affected area, pollution may increase to dangerous levels.
Here are your updated local forecasts:
Monday: Sunny, with a high near 50. Light north wind.
Monday night: Mostly clear, with a low around 27. North northwest wind 3 to 5 mph.
Tuesday: Mostly sunny, with a high near 48. North northeast wind 3 to 5 mph.
Monday: Sunny, with a high near 49. North wind around 5 mph.
Monday night: Mostly clear, with a low around 28. North wind around 6 mph.
Tuesday: Mostly sunny, with a high near 47. North northeast wind around 6 mph.
Monday: Areas of fog before 10 a.m. Otherwise, mostly cloudy through mid-morning, then gradual clearing, with a high near 48. Calm wind.
Monday night: Areas of fog after 4 a.m. Otherwise, increasing clouds, with a low around 29. Calm wind.
Tuesday: Areas of fog before 10 a.m. Otherwise, partly sunny, with a high near 47. Calm wind.