Special Weather Statement issued January 15 at 7:55PM PST by NWS Pendleton OR

Patchy dense freezing fog will continue into late evening hours
across the Blue Mountain Foothills of WA and OR. Visibilities of
less than 1/2 mile are possible in spots, especially along Highway
11 near Athena, Interstate 84 near Pendleton and in portions of
Walla Walla. Drivers should expect sudden reductions in
visibility. Slow down and allow for extra space between yourself
and other vehicles if you encounter dense fog.