On Monday at 4:23 a.m. a dense fog advisory was issued by the NWS Hanford CA. The advisory is for Merced - Madera - Mendota, Fresno area and Hanford - Corcoran - Lemoore.

On Friday at 7:38 a.m. a dense fog advisory was issued by the National Weather Service in effect until noon for West Central Willamette Valley, East Central Willamette Valley, Benton County Lowlands and Linn County Lowlands.

On Sunday at 3:24 a.m. a dense fog advisory was issued by the National Weather Service in effect until 11 a.m. The advisory is for Greater Oconee, Greater Pickens, Central Greenville, Southern Greenville,

The National Weather Service is warning of air stagnation and dense fog in the Willamette Valley. Advisories have been issued for both events. Dense fog is expected to persist until 1 p.m. Thursday in the central Willamette Valley,

An updated dense fog advisory was issued by the National Weather Service on Thursday at 11:49 a.m. in effect until noon for Central Douglas County.