National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heavy Lake Effect Snow Downwind of Lakes Erie and Ontario; Fire Weather Concerns in the Southern Plains and Southeast

A multi-day heavy lake effect snow event is expected downwind of Lakes Erie and Ontario through New Year's Day. There is increasing confidence in snow squalls causing bursts of snow & gusty winds on New Year's Eve. Elevated fire weather conditions will continue today over parts of the Southern Plains and across much of the Southeast U.S. Read More >

Hazardous Weather Conditions

Current conditions at

BLACK DIAMOND (PIBC1)

Lat: 37.95°NLon: 121.88444°WElev: 1600.0ft.

NA

48°F

9°C

Humidity 42%
Wind Speed NNE 14 MPH
Barometer NA
Dewpoint 26°F (-3°C)
Visibility NA
Wind Chill42°F (6°C)
Last update 30 Dec 05:28 AM PST
Extended Forecast for

Brentwood CA

Cold Weather Advisory until December 30, 09:00am
Dense Fog Advisory December 30, 06:37am until December 30, 10:00am
Click here for hazard details and duration
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  •  
    Cold Weather Advisory until December 30, 09:00am
    Dense Fog Advisory December 30, 06:37am until December 30, 10:00am

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Today

    High: 48 °F

    Patchy Dense
    Fog

  • Tonight

    Tonight: A 10 percent chance of rain after 4am. Patchy fog after 3am. Otherwise, cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Cloudy then
    Slight Chance
    Rain and
    Patchy Fog

  • Wednesday

    Wednesday: Rain, mainly after 4pm. Patchy fog after 2pm. High near 49. Calm wind becoming east northeast around 6 mph in the morning. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 49 °F

    Chance Rain
    then Rain and
    Patchy Fog

  • Wednesday Night

    Wednesday Night: Rain. Areas of fog. Low around 48. East wind 3 to 7 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 48 °F

    Rain and
    Areas Fog

  • New Year's Day

    New Year's Day: Rain. Areas of fog. High near 56. South southeast wind around 7 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 56 °F

    Rain and
    Areas Fog

  • Thursday Night

    Thursday Night: Rain likely. Areas of fog before 2am, then patchy fog after 3am. Otherwise, cloudy, with a low around 54. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 54 °F

    Rain Likely
    and Areas Fog

  • Friday

    Friday: Rain likely. Patchy fog before 7am. Otherwise, cloudy, with a high near 58. Chance of precipitation is 70%.

    High: 58 °F

    Rain Likely
    and Patchy
    Fog

  • Friday Night

    Friday Night: Rain. Patchy fog after 3am. Otherwise, cloudy, with a low around 49.

    Low: 49 °F

    Rain and
    Patchy Fog

Detailed Forecast

Today
Patchy dense fog before 2pm. Otherwise, cloudy, with a high near 48. Calm wind becoming east northeast around 6 mph in the morning.
Tonight
A 10 percent chance of rain after 4am. Patchy fog after 3am. Otherwise, cloudy, with a low around 42. Calm wind.
Wednesday
Rain, mainly after 4pm. Patchy fog after 2pm. High near 49. Calm wind becoming east northeast around 6 mph in the morning. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
Rain. Areas of fog. Low around 48. East wind 3 to 7 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
New Year's Day
Rain. Areas of fog. High near 56. South southeast wind around 7 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
Rain likely. Areas of fog before 2am, then patchy fog after 3am. Otherwise, cloudy, with a low around 54. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Rain likely. Patchy fog before 7am. Otherwise, cloudy, with a high near 58. Chance of precipitation is 70%.
Friday Night
Rain. Patchy fog after 3am. Otherwise, cloudy, with a low around 49.
Saturday
Rain likely, mainly after 4pm. Patchy fog before 11am, then patchy fog after 5pm. Otherwise, mostly cloudy, with a high near 55.
Saturday Night
Rain likely, mainly before 10pm. Patchy fog. Otherwise, cloudy, with a low around 46.
Sunday
A chance of rain. Areas of fog. Otherwise, mostly cloudy, with a high near 54.
Sunday Night
A chance of rain. Patchy fog. Otherwise, mostly cloudy, with a low around 45.
Monday
A chance of rain. Areas of fog. Otherwise, mostly cloudy, with a high near 53.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Brentwood CA
 37.93°N 121.7°W (Elev. 75 ft)
Last Update:
12:27 am PST Dec 30, 2025
Forecast Valid:
6am PST Dec 30, 2025-6pm PST Jan 5, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation