Overview
- NWS Hanford issued the advisory at 10:46 p.m. Saturday for the Grapevine segment of the 5 Freeway in California.
- Visibility may drop to a quarter mile or less during the advisory period, especially through the early morning.
- Drivers are urged to slow down, use low-beam headlights or fog lights, and allow extra following distance.
- Officials advise avoiding high beams and pulling into a safe location with hazard lights if visibility nears zero.
- Separately, the NWS advised Jackson County, Oregon, under dense fog until noon Saturday, reflecting ongoing morning travel hazards in recent days.