Dense Fog Advisory Issued for Northern California

Everythiiing

Jan 21, 2026 • 3 min read

A view of dense fog covering a road in Northern California, with visibility significantly reduced.

Dense Fog Advisory Issued for Northern California

In a recent weather update, meteorologists have issued a dense fog advisory for parts of Northern California, particularly the Central Valley and the Delta region. This advisory is expected to impact morning commutes, with visibility dropping to less than a quarter of a mile in some areas.

Impact on Morning Commutes

The dense fog is causing significant challenges for drivers, with sudden drops in visibility making it difficult to navigate roads safely. Meteorologists advise commuters to allow extra time for their morning drives and to use low beams to improve visibility. The advisory is set to remain in effect until noon, with conditions expected to improve gradually as the day progresses.

Weather Conditions and Temperature

Temperatures in the affected areas are currently in the low 40s, with freezing fog reported around Truckee. The combination of fog and pollutants is also affecting air quality, with readings in the moderate to unhealthy category for some areas. This poses a concern, especially for individuals with lung ailments.

Forecast for the Week

For the Central Valley, afternoon highs are expected to peak in the low to mid-50s, while the Foothills can expect mild temperatures and sunshine. However, the lack of rainfall in the near future is a growing concern, with the last measurable rainfall occurring nearly two weeks ago. Typically, Sacramento receives 3.66 inches of rain in January, and so far, only 2.30 inches have been recorded.

Safety Tips for Driving in Fog

Driving in dense fog can be hazardous, but there are several precautions drivers can take to ensure their safety:

Looking Ahead

As the week progresses, a system off the coast is expected to bring some shower activity to Southern California, but Northern California will remain dry. Another arched ridge of high pressure is set to build in by the weekend, maintaining the current weather pattern. Unfortunately, this means no rain or snow is expected in the Foothills or Sierra in the next seven days.

Stay Informed

For the latest updates on the dense fog advisory and weather conditions, residents are encouraged to stay tuned to local news outlets and meteorological services. Being prepared and informed is key to navigating these challenging weather conditions safely.

Conclusion

The dense fog advisory serves as a reminder of the unpredictable nature of weather and the importance of taking necessary precautions. By staying informed and following safety guidelines, residents can mitigate the risks associated with driving in foggy conditions. As the week unfolds, keep an eye on weather forecasts to plan your activities accordingly.

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