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.

"Light winds and limited air movement will lead to a period of stagnant air conditions," NWS said, warning of "deteriorating air quality for people with respiratory problems" and "visibility one quarter mile or less in dense fog," which "could make driving conditions hazardous."

A dense fog advisory was issued by the NWS Hanford CA on Monday at 9:47 a.m. Visibility one quarter mile or less in dense fog for Hanford - Corcoran - Lemoore until noon today. "Low visibility could make driving conditions hazardous," states the NWS. "If driving, slow down, use your headlights, and leave plenty of distance ahead of you."

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.