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 NNE 0 MPH
Barometer NA
Dewpoint 31°F (-1°C)
Visibility NA
Last update 26 Dec 02:06 AM PST
Extended Forecast for

4 Miles W Winthrop WA

  • Overnight

    Overnight: Patchy freezing fog after 3am. Partly cloudy, with a low around 27. Calm wind.

    Low: 27 °F

    Patchy
    Freezing Fog

  • Friday

    Friday: Snow likely, mainly between 10am and 4pm. Mostly cloudy, with a high near 30. Calm wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    High: 30 °F

    Snow Likely

  • Friday Night

    Friday Night: Snow likely, mainly between 7pm and 10pm. Mostly cloudy, with a low around 12. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 12 °F

    Snow Likely
    then Slight
    Chance Snow

  • Saturday

    Saturday: Sunny, with a high near 22. Light northwest wind.

    High: 22 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 10. Calm wind.

    Low: 10 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 25.

    High: 25 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 15.

    Low: 15 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 25.

    High: 25 °F

    Mostly Cloudy

  • Monday Night

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

    Low: 20 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Patchy freezing fog after 3am. Partly cloudy, with a low around 27. Calm wind.
Friday
Snow likely, mainly between 10am and 4pm. Mostly cloudy, with a high near 30. Calm wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Friday Night
Snow likely, mainly between 7pm and 10pm. Mostly cloudy, with a low around 12. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Saturday
Sunny, with a high near 22. Light northwest wind.
Saturday Night
Partly cloudy, with a low around 10. Calm wind.
Sunday
Partly sunny, with a high near 25.
Sunday Night
Mostly cloudy, with a low around 15.
Monday
Mostly cloudy, with a high near 25.
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 23.
Wednesday
A slight chance of rain and snow. Mostly cloudy, with a high near 33. Chance of precipitation is 20%.
Wednesday Night
A chance of rain and snow. Mostly cloudy, with a low around 24. Chance of precipitation is 40%.
New Year's Day
A 40 percent chance of snow. Partly sunny, with a high near 33.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles W Winthrop WA
 48.47°N 120.25°W (Elev. 2743 ft)
Last Update:
1:32 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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Chance of Precipitation