* WHAT…For the Freezing Fog Advisory, visibility one quarter mile
or less in fog and freezing fog. For the Air Stagnation Advisory,
light winds and limited air movement will lead to a period of
stagnant air conditions. This scenario could result in the build
up of air pollutants over time.
* WHERE…South Willamette Valley.
* WHEN…For the Air Stagnation Advisory, until 4 AM PST Saturday.
For the Freezing Fog Advisory, until 11 AM PST Thursday.
* IMPACTS…Poor air quality may cause issues for people with
respiratory problems. Low visibility could make driving conditions
hazardous. With temperatures at or just below freezing, fog
droplets may freeze on contact with surfaces, with slick spots on
roadways possible overnight into early Thursday.