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 >

Current conditions at

NCSB (NCSW1)

Lat: 48.42528°NLon: 120.14194°WElev: 1697.0ft.

NA

31°F

-1°C

Humidity 100%
Wind Speed NNW 3 MPH
Barometer NA
Dewpoint 31°F (-1°C)
Visibility NA
Last update 24 Dec 11:06 PM PST
Extended Forecast for

12 Miles SW Winthrop WA

  • Tonight

    Tonight: Partly cloudy, with a low around 25. Calm wind.

    Low: 25 °F

    Partly Cloudy

  • Christmas Day

    Christmas Day: Snow likely before 1pm, then snow, possibly mixed with rain. High near 29. Calm wind. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.

    High: 29 °F

    Snow Likely
    then
    Rain/Snow

  • Thursday Night

    Thursday Night: Rain and snow likely before 2am, then a chance of snow. Mostly cloudy, with a low around 28. Calm wind. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    Low: 28 °F

    Rain/Snow
    Likely then
    Chance
    Rain/Snow

  • Friday

    Friday: Snow, mainly after 10am. High near 30. Calm wind becoming southwest around 6 mph in the afternoon. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.

    High: 30 °F

    Snow

  • Friday Night

    Friday Night: Snow likely, mainly before 10pm. Mostly cloudy, with a low around 19. West wind around 7 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.

    Low: 19 °F

    Snow Likely
    then Chance
    Snow

  • Saturday

    Saturday: Mostly sunny, with a high near 30.

    High: 30 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 17.

    Low: 17 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 34.

    High: 34 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 21.

    Low: 21 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 25. Calm wind.
Christmas Day
Snow likely before 1pm, then snow, possibly mixed with rain. High near 29. Calm wind. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.
Thursday Night
Rain and snow likely before 2am, then a chance of snow. Mostly cloudy, with a low around 28. Calm wind. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Friday
Snow, mainly after 10am. High near 30. Calm wind becoming southwest around 6 mph in the afternoon. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.
Friday Night
Snow likely, mainly before 10pm. Mostly cloudy, with a low around 19. West wind around 7 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.
Saturday
Mostly sunny, with a high near 30.
Saturday Night
Mostly cloudy, with a low around 17.
Sunday
Partly sunny, with a high near 34.
Sunday Night
Mostly cloudy, with a low around 21.
Monday
Partly sunny, with a high near 34.
Monday Night
Mostly cloudy, with a low around 26.
Tuesday
Partly sunny, with a high near 38.
Tuesday Night
Mostly cloudy, with a low around 29.
Wednesday
A chance of rain and snow. Mostly sunny, with a high near 38. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
12 Miles SW Winthrop WA
 48.37°N 120.41°W (Elev. 2887 ft)
Last Update:
9:17 pm PST Dec 24, 2025
Forecast Valid:
11pm PST Dec 24, 2025-6pm PST Dec 31, 2025
 
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Additional Resources

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Chance of Precipitation