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

Prolonged Atmospheric River Will Impact the Northwest Early this Week

A weather system in the Pacific Northwest will produce rain throughout the day, before a potent atmospheric river produces a prolonged round of heavy rainfall, widespread urban and river flooding, and high elevation snow to the region Monday through Wednesday. Showers and thunderstorms may produce isolated damaging winds, a brief tornado, and locally heavy rainfall across parts of Florida today. Read More >

Current conditions at

BLACK DIAMOND (PIBC1)

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

NA

43°F

6°C

Humidity 86%
Wind Speed N 5 MPH
Barometer NA
Dewpoint 39°F (4°C)
Visibility NA
Wind Chill40°F (4°C)
Last update 08 Dec 03:28 AM PST
Extended Forecast for

2 Miles WSW Brentwood CA

  • Overnight

    Overnight: Areas of dense fog. Otherwise, mostly cloudy, with a low around 41. Calm wind.

    Low: 41 °F

    Areas Dense
    Fog

  • Monday

    Monday: Areas of dense fog before noon. Otherwise, partly sunny, with a high near 53. Light east wind.

    High: 53 °F

    Areas Dense
    Fog then
    Mostly Sunny

  • Monday Night

    Monday Night: Patchy dense fog. Otherwise, increasing clouds, with a low around 42. Calm wind.

    Low: 42 °F

    Patchy Dense
    Fog

  • Tuesday

    Tuesday: Areas of fog before noon. Otherwise, partly sunny, with a high near 56. Light and variable wind.

    High: 56 °F

    Areas Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog before 8pm, then patchy fog after 1am. Otherwise, partly cloudy, with a low around 44. Calm wind.

    Low: 44 °F

    Patchy Fog

  • Wednesday

    Wednesday: Areas of fog before 10am. Otherwise, mostly sunny, with a high near 60.

    High: 60 °F

    Areas Fog
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: Patchy fog after 3am. Otherwise, mostly clear, with a low around 44.

    Low: 44 °F

    Mostly Clear
    then Patchy
    Fog

  • Thursday

    Thursday: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 60.

    High: 60 °F

    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Patchy fog after 3am. Otherwise, partly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Clear
    then Patchy
    Fog

Detailed Forecast

Overnight
Areas of dense fog. Otherwise, mostly cloudy, with a low around 41. Calm wind.
Monday
Areas of dense fog before noon. Otherwise, partly sunny, with a high near 53. Light east wind.
Monday Night
Patchy dense fog. Otherwise, increasing clouds, with a low around 42. Calm wind.
Tuesday
Areas of fog before noon. Otherwise, partly sunny, with a high near 56. Light and variable wind.
Tuesday Night
Patchy fog before 8pm, then patchy fog after 1am. Otherwise, partly cloudy, with a low around 44. Calm wind.
Wednesday
Areas of fog before 10am. Otherwise, mostly sunny, with a high near 60.
Wednesday Night
Patchy fog after 3am. Otherwise, mostly clear, with a low around 44.
Thursday
Patchy fog before 11am. Otherwise, mostly sunny, with a high near 60.
Thursday Night
Patchy fog after 3am. Otherwise, partly cloudy, with a low around 43.
Friday
Areas of fog before 10am. Otherwise, mostly sunny, with a high near 59.
Friday Night
Patchy fog. Otherwise, partly cloudy, with a low around 43.
Saturday
Areas of fog. Otherwise, mostly sunny, with a high near 59.
Saturday Night
Patchy fog. Otherwise, partly cloudy, with a low around 44.
Sunday
Areas of fog. Otherwise, partly sunny, with a high near 60.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WSW Brentwood CA
 37.93°N 121.73°W (Elev. 105 ft)
Last Update:
2:09 am PST Dec 8, 2025
Forecast Valid:
3am PST Dec 8, 2025-6pm PST Dec 14, 2025
 
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Additional Resources

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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