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

Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Hazardous Weather Conditions

Current conditions at

WHITE CLOUD (CISC1)

Lat: 39.31944°NLon: 120.84211°WElev: 4302.0ft.

NA

42°F

6°C

Humidity 100%
Wind Speed SSE 14 MPH
Barometer NA
Dewpoint 42°F (6°C)
Visibility NA
Wind Chill35°F (2°C)
Last update 24 Dec 07:33 PM PST
Extended Forecast for

13 Miles NNE Grass Valley CA

Winter Storm Warning December 24, 08:23pm until December 26, 10:00pm
Click here for hazard details and duration
Winter Storm Warning
  •  
    Winter Storm Warning December 24, 08:23pm until December 26, 10:00pm

    NOW until 10:00pm Fri

    Winter Storm Warning

  • Tonight

    Low: 39 °F

    Heavy Rain

  • Christmas Day

    Christmas Day: Rain and possibly a thunderstorm before 1pm, then showers and possibly a thunderstorm between 1pm and 4pm, then rain and possibly a thunderstorm after 4pm. Some of the storms could produce heavy rainfall. High near 43. South wind 14 to 20 mph, with gusts as high as 38 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

    High: 43 °F

    Heavy Rain

  • Thursday Night

    Thursday Night: Rain. The rain could be heavy at times. Low around 36. South wind 15 to 17 mph, with gusts as high as 38 mph. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.

    Low: 36 °F

    Heavy Rain

  • Friday

    Friday: Rain. High near 42. South wind 8 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 42 °F

    Rain

  • Friday Night

    Friday Night: Rain before 4am, then a chance of rain and snow. Low around 35. Light south southeast wind. Chance of precipitation is 90%. Little or no snow accumulation expected.

    Low: 35 °F

    Rain then
    Rain/Snow
    Likely

  • Saturday

    Saturday: A chance of rain and snow before 10am, then a slight chance of rain. Mostly sunny, with a high near 45. Chance of precipitation is 40%. Little or no snow accumulation expected.

    High: 45 °F

    Chance
    Rain/Snow
    then Slight
    Chance Rain

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 32.

    Low: 32 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 49.

    High: 49 °F

    Sunny

Detailed Forecast

Tonight
Showers and possibly a thunderstorm before 10pm, then rain after 10pm. Some of the storms could produce heavy rainfall. Low around 39. South southeast wind 14 to 18 mph, with gusts as high as 39 mph. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.
Christmas Day
Rain and possibly a thunderstorm before 1pm, then showers and possibly a thunderstorm between 1pm and 4pm, then rain and possibly a thunderstorm after 4pm. Some of the storms could produce heavy rainfall. High near 43. South wind 14 to 20 mph, with gusts as high as 38 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Thursday Night
Rain. The rain could be heavy at times. Low around 36. South wind 15 to 17 mph, with gusts as high as 38 mph. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.
Friday
Rain. High near 42. South wind 8 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
Rain before 4am, then a chance of rain and snow. Low around 35. Light south southeast wind. Chance of precipitation is 90%. Little or no snow accumulation expected.
Saturday
A chance of rain and snow before 10am, then a slight chance of rain. Mostly sunny, with a high near 45. Chance of precipitation is 40%. Little or no snow accumulation expected.
Saturday Night
Mostly clear, with a low around 32.
Sunday
Sunny, with a high near 49.
Sunday Night
Mostly clear, with a low around 34.
Monday
Sunny, with a high near 52.
Monday Night
Clear, with a low around 36.
Tuesday
Sunny, with a high near 57.
Tuesday Night
Mostly clear, with a low around 39.
Wednesday
A slight chance of rain. Sunny, with a high near 58.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
13 Miles NNE Grass Valley CA
 39.4°N 120.97°W (Elev. 3360 ft)
Last Update:
1:21 pm PST Dec 24, 2025
Forecast Valid:
8pm PST Dec 24, 2025-6pm PST Dec 31, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation