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

32°F

0°C

Humidity 100%
Wind Speed NW 4 MPH
Barometer NA
Dewpoint 32°F (0°C)
Visibility NA
Wind Chill28°F (-2°C)
Last update 25 Dec 12:06 AM PST
Extended Forecast for

Winthrop WA

  • Overnight

    Overnight: Patchy freezing fog before 1am, then patchy freezing fog after 3am. Increasing clouds, with a low around 22. Calm wind.

    Low: 22 °F

    Patchy
    Freezing Fog

  • Christmas Day

    Christmas Day: Rain and snow. Patchy freezing fog before 1pm. High near 31. Calm wind. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    High: 31 °F

    Rain/Snow and
    Patchy
    Freezing Fog

  • Thursday Night

    Thursday Night: Rain and snow likely before 5am, then a chance of snow. Mostly cloudy, with a low around 24. Calm wind. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 24 °F

    Rain/Snow
    Likely then
    Chance
    Rain/Snow

  • Friday

    Friday: Snow likely, mainly between 10am and 4pm. Mostly cloudy, with a high near 30. Calm wind becoming south around 6 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: A 50 percent chance of snow before 10pm. Mostly cloudy, with a low around 15. Northwest wind around 6 mph. New snow accumulation of less than a half inch possible.

    Low: 15 °F

    Chance Snow
    then Partly
    Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 32.

    High: 32 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 14.

    Low: 14 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 32.

    High: 32 °F

    Partly Sunny

  • Sunday Night

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

    Low: 17 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Patchy freezing fog before 1am, then patchy freezing fog after 3am. Increasing clouds, with a low around 22. Calm wind.
Christmas Day
Rain and snow. Patchy freezing fog before 1pm. High near 31. Calm wind. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Thursday Night
Rain and snow likely before 5am, then a chance of snow. Mostly cloudy, with a low around 24. Calm wind. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Friday
Snow likely, mainly between 10am and 4pm. Mostly cloudy, with a high near 30. Calm wind becoming south 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. Mostly cloudy, with a low around 15. Northwest wind around 6 mph. New snow accumulation of less than a half inch possible.
Saturday
Mostly sunny, with a high near 32.
Saturday Night
Mostly cloudy, with a low around 14.
Sunday
Partly sunny, with a high near 32.
Sunday Night
Mostly cloudy, with a low around 17.
Monday
Mostly cloudy, with a high near 33.
Monday Night
Mostly cloudy, with a low around 22.
Tuesday
Mostly cloudy, with a high near 36.
Tuesday Night
Mostly cloudy, with a low around 24.
Wednesday
A slight chance of rain and snow. Partly sunny, with a high near 37. Chance of precipitation is 10%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Winthrop WA
 48.48°N 120.19°W (Elev. 1801 ft)
Last Update:
9:17 pm PST Dec 24, 2025
Forecast Valid:
12am PST Dec 25, 2025-6pm PST Dec 31, 2025
 
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Additional Resources

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