Prolonged Atmospheric River in the Pacific Northwest; Snow and High Winds from the Upper Midwest into the Northeast

A prolonged atmospheric river will continue to impact the Pacific Northwest into the Northern Rockies with heavy rainfall, areas of urban and river flooding, landslides, heavy mountain snow, and gusty winds into Thursday. A strong clipper system will bring the threat of heavy snow and high winds across the Upper Midwest/Great Lakes as well as portions of the interior Northeast and Appalachians. Read More >

Current conditions at

BLACK DIAMOND (PIBC1)

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

NA

49°F

9°C

Humidity 72%
Wind Speed N 9 MPH
Barometer NA
Dewpoint 40°F (4°C)
Visibility NA
Wind Chill45°F (7°C)
Last update 09 Dec 11:28 PM PST
Extended Forecast for

Brentwood CA

  • Overnight

    Overnight: Patchy dense fog after 1am.  Otherwise, mostly cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Patchy Dense
    Fog

  • Wednesday

    Wednesday: Areas of dense fog before 11am.  Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 57. Light northeast wind.

    High: 57 °F

    Areas Dense
    Fog then
    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 44. Calm wind.

    Low: 44 °F

    Partly Cloudy

  • Thursday

    Thursday: Patchy fog before 7am.  Otherwise, mostly sunny, with a high near 60. Light north northeast wind.

    High: 60 °F

    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Partly Cloudy

  • Friday

    Friday: Patchy fog between 7am and 8am.  Otherwise, mostly sunny, with a high near 58.

    High: 58 °F

    Patchy Fog
    then Mostly
    Sunny

  • Friday Night

    Friday Night: Patchy fog after 5am.  Otherwise, partly cloudy, with a low around 42.

    Low: 42 °F

    Partly Cloudy
    then Patchy
    Fog

  • Saturday

    Saturday: Patchy fog before 9am.  Otherwise, partly sunny, with a high near 58.

    High: 58 °F

    Patchy Fog
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 4am.  Otherwise, partly cloudy, with a low around 42.

    Low: 42 °F

    Partly Cloudy
    then Patchy
    Fog

Detailed Forecast

Overnight
Patchy dense fog after 1am. Otherwise, mostly cloudy, with a low around 42. Calm wind.
Wednesday
Areas of dense fog before 11am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 57. Light northeast wind.
Wednesday Night
Partly cloudy, with a low around 44. Calm wind.
Thursday
Patchy fog before 7am. Otherwise, mostly sunny, with a high near 60. Light north northeast wind.
Thursday Night
Partly cloudy, with a low around 42. Calm wind.
Friday
Patchy fog between 7am and 8am. Otherwise, mostly sunny, with a high near 58.
Friday Night
Patchy fog after 5am. Otherwise, partly cloudy, with a low around 42.
Saturday
Patchy fog before 9am. Otherwise, partly sunny, with a high near 58.
Saturday Night
Patchy fog after 4am. Otherwise, partly cloudy, with a low around 42.
Sunday
Areas of fog before 10am. Otherwise, partly sunny, with a high near 58.
Sunday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 45.
Monday
A slight chance of rain. Patchy fog. Otherwise, partly sunny, with a high near 59.
Monday Night
A chance of rain. Patchy fog. Otherwise, mostly cloudy, with a low around 49.
Tuesday
A slight chance of rain. Patchy fog. Otherwise, partly sunny, with a high near 61.
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ABOUT THIS FORECAST

 
Point Forecast:
Brentwood CA
 37.93°N 121.7°W (Elev. 75 ft)
12:26 pm PST Dec 9, 2025
12am PST Dec 10, 2025-6pm PST Dec 16, 2025
 
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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