The advisory is in effect until 2 p.m. A dense fog advisory is issued by your local National Weather Service office when widespread dense fog develops. When this happens, visibilities frequently drop to one-quarter of a mile or less. These conditions make travel difficult. Take extra caution when on the road or avoid driving if possible.

On Monday at 9:42 a.m. a dense fog advisory was issued by the National Weather Service in effect until 1 p.m. for Foothills of the Northern Blue Mountains of Oregon, Foothills of the Southern Blue Mountains of Oregon and North Central Oregon.