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

ILLINOIS VALLEY AIRPORT (SBFO3)

Lat: 42.10375°NLon: 123.68508°WElev: 1389.0ft.

NA

37°F

3°C

Humidity 98%
Wind Speed WNW 1 MPH
Barometer NA
Dewpoint 36°F (2°C)
Visibility NA
Last update 26 Dec 01:52 AM PST
Extended Forecast for

Happy Camp CA

Winter Storm Warning December 26, 02:27am until December 26, 04:00pm
Click here for hazard details and duration
Winter Storm Warning
  •  
    Winter Storm Warning December 26, 02:27am until December 26, 04:00pm

    NOW until 4:00pm Fri

    Winter Storm Warning

  • Overnight

    Low: 35 °F

    Rain

  • Friday

    Friday: Rain before 8am, then rain, possibly mixed with snow between 8am and 9am, then rain after 9am. Snow level 3300 feet rising to 4100 feet in the afternoon. High near 44. West northwest wind around 6 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.

    High: 44 °F

    Rain/Snow
    then Rain

  • Friday Night

    Friday Night: Rain showers before 1am, then a chance of snow showers after 4am. Snow level 3300 feet lowering to 1900 feet after midnight . Low around 30. Light and variable wind. Chance of precipitation is 80%. Little or no snow accumulation expected.

    Low: 30 °F

    Showers then
    Chance
    Rain/Snow

  • Saturday

    Saturday: A chance of rain and snow showers before 10am, then a chance of rain showers. Snow level 1400 feet rising to 2600 feet in the afternoon. Mostly sunny, with a high near 44. Calm wind becoming north around 5 mph in the afternoon. Chance of precipitation is 30%. Little or no snow accumulation expected.

    High: 44 °F

    Chance
    Rain/Snow
    then Chance
    Showers

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 27. East northeast wind 3 to 5 mph.

    Low: 27 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 47.

    High: 47 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 29.

    Low: 29 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 50.

    High: 50 °F

    Sunny

Detailed Forecast

Overnight
Rain. Snow level 3100 feet. Low around 35. North wind around 7 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Rain before 8am, then rain, possibly mixed with snow between 8am and 9am, then rain after 9am. Snow level 3300 feet rising to 4100 feet in the afternoon. High near 44. West northwest wind around 6 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.
Friday Night
Rain showers before 1am, then a chance of snow showers after 4am. Snow level 3300 feet lowering to 1900 feet after midnight . Low around 30. Light and variable wind. Chance of precipitation is 80%. Little or no snow accumulation expected.
Saturday
A chance of rain and snow showers before 10am, then a chance of rain showers. Snow level 1400 feet rising to 2600 feet in the afternoon. Mostly sunny, with a high near 44. Calm wind becoming north around 5 mph in the afternoon. Chance of precipitation is 30%. Little or no snow accumulation expected.
Saturday Night
Partly cloudy, with a low around 27. East northeast wind 3 to 5 mph.
Sunday
Mostly sunny, with a high near 47.
Sunday Night
Partly cloudy, with a low around 29.
Monday
Sunny, with a high near 50.
Monday Night
Mostly clear, with a low around 33.
Tuesday
Sunny, with a high near 54.
Tuesday Night
Partly cloudy, with a low around 36.
Wednesday
Partly sunny, with a high near 54.
Wednesday Night
A slight chance of rain. Mostly cloudy, with a low around 37.
New Year's Day
A chance of rain. Mostly cloudy, with a high near 49.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Happy Camp CA
 41.81°N 123.36°W (Elev. 1299 ft)
Last Update:
2:21 am PST Dec 26, 2025
Forecast Valid:
2am PST Dec 26, 2025-6pm PST Jan 1, 2026
 
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Additional Resources

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