Dense Fog Advisory issued January 15 at 7:43PM PST until January 16 at 10:00AM PST by NWS Portland OR

* WHAT…For the Dense Fog Advisory, visibility one quarter mile or
less in dense fog. For the Air Stagnation Advisory, light winds
and limited air movement will lead to a period of stagnant air
conditions.

* WHERE…South Willamette Valley.

* WHEN…Until 10 AM PST Thursday.

* IMPACTS…For the Dense Fog Advisory, low visibility could make
driving conditions hazardous. For the Air Stagnation Advisory,
Deteriorating air quality may cause issues for people with
respiratory problems.