Dense Fog Chokes Sacramento Valley

NWS issues advisory until noon, urges drivers to slow down and use caution

Jan. 31, 2026 at 11:55am

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Dense fog has blanketed much of the Sacramento Valley early Saturday morning, reducing visibility to a quarter mile or less in some areas. The National Weather Service has issued a Dense Fog Advisory that will remain in effect until 12 p.m., warning drivers to expect slow commutes and hazardous road conditions.

Why it matters

Dense fog can significantly impact visibility and driving conditions, increasing the risk of accidents. This advisory is important for residents in the Sacramento Valley area who may need to travel during the affected time period.

The details

According to the National Weather Service, the dense fog is expected to linger well into the late morning hours, creating instrument flight rule (IFR) or low instrument flight rule (LIFR) conditions at smaller airports and reducing visibility on state highways. Caltrans is advising drivers to slow down, use low beam headlights, follow the right fog line, and avoid stopping on freeway shoulders.

  • The Dense Fog Advisory is in effect from 12:00 a.m. to 12:00 p.m. on Saturday, January 31, 2026.

The players

National Weather Service

The federal agency responsible for weather forecasting and issuing weather-related advisories and warnings.

Caltrans District 3

The California Department of Transportation division responsible for maintaining and improving state highways in the Sacramento Valley region.

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What’s next

The National Weather Service expects patchy fog to redevelop overnight and into Sunday and Monday mornings, so drivers should continue to check for updates and exercise caution during their commutes.

The takeaway

This dense fog advisory serves as a reminder for Sacramento Valley residents to be extra vigilant when driving in low-visibility conditions, as it can significantly increase the risk of accidents. Following safety guidelines from authorities like Caltrans can help ensure a safe commute.