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 99%
Wind Speed NNW 0 MPH
Barometer NA
Dewpoint 31°F (-1°C)
Visibility NA
Last update 25 Dec 09:06 PM PST
Extended Forecast for

4 Miles SSE Winthrop WA

  • Tonight

    Tonight: A 20 percent chance of rain before 10pm. Patchy freezing fog. Mostly cloudy, with a low around 24. Calm wind.

    Low: 24 °F

    Slight Chance
    Rain and
    Patchy
    Freezing Fog

  • Friday

    Friday: Snow likely before 1pm, then snow likely, possibly mixed with rain between 1pm and 2pm, then snow likely after 2pm. Patchy freezing fog before 9am. Partly sunny, with a high near 33. Calm wind becoming north around 6 mph in the afternoon. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    High: 33 °F

    Snow Likely
    and Patchy
    Freezing Fog
    then
    Rain/Snow
    Likely

  • Friday Night

    Friday Night: A 50 percent chance of snow before 10pm. Partly cloudy, with a low around 13. Northwest wind 3 to 6 mph. New snow accumulation of less than a half inch possible.

    Low: 13 °F

    Chance Snow
    then Partly
    Cloudy

  • Saturday

    Saturday: Sunny, with a high near 24. Light northwest wind.

    High: 24 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 11. Calm wind.

    Low: 11 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 26.

    High: 26 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 16.

    Low: 16 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 26.

    High: 26 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 20.

    Low: 20 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A 20 percent chance of rain before 10pm. Patchy freezing fog. Mostly cloudy, with a low around 24. Calm wind.
Friday
Snow likely before 1pm, then snow likely, possibly mixed with rain between 1pm and 2pm, then snow likely after 2pm. Patchy freezing fog before 9am. Partly sunny, with a high near 33. Calm wind becoming north around 6 mph in the afternoon. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Friday Night
A 50 percent chance of snow before 10pm. Partly cloudy, with a low around 13. Northwest wind 3 to 6 mph. New snow accumulation of less than a half inch possible.
Saturday
Sunny, with a high near 24. Light northwest wind.
Saturday Night
Mostly cloudy, with a low around 11. Calm wind.
Sunday
Mostly sunny, with a high near 26.
Sunday Night
Mostly cloudy, with a low around 16.
Monday
Mostly cloudy, with a high near 26.
Monday Night
Mostly cloudy, with a low around 20.
Tuesday
Mostly cloudy, with a high near 31.
Tuesday Night
Mostly cloudy, with a low around 24.
Wednesday
A slight chance of rain and snow. Mostly cloudy, with a high near 31. Chance of precipitation is 20%.
Wednesday Night
A chance of rain and snow. Mostly cloudy, with a low around 25. Chance of precipitation is 30%.
New Year's Day
A chance of rain and snow. Partly sunny, with a high near 31. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSE Winthrop WA
 48.42°N 120.14°W (Elev. 1706 ft)
Last Update:
9:12 pm PST Dec 25, 2025
Forecast Valid:
9pm PST Dec 25, 2025-6pm PST Jan 1, 2026
 
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Additional Resources

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