National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heavy Rainfall to Bring Flooding Threat to California; Heavy Snow in the Sierra

A strong atmospheric river will bring heavy rainfall to California through the holiday week. The heaviest rainfall is expected on Wednesday in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall is expected in the Sierra Nevada from the atmospheric river, raising concerns for major snow‐load impacts. Travel may be difficult to impossible over the passes. Read More >

Hazardous Weather Conditions

Current conditions at

NCSB (NCSW1)

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

NA

30°F

-1°C

Humidity 97%
Wind Speed NNW 2 MPH
Barometer NA
Dewpoint 29°F (-2°C)
Visibility NA
Last update 24 Dec 01:06 AM PST
Extended Forecast for

4 Miles WSW Winthrop WA

Winter Weather Advisory until December 24, 04:00pm
Click here for hazard details and duration
Winter Weather Advisory
  •  
    Winter Weather Advisory until December 24, 04:00pm

    NOW until 4:00pm Wed

    Winter Weather Advisory

  • Overnight

    Low: 28 °F

    Snow

  • Wednesday

    Wednesday: Snow before noon, then rain. High near 29. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.

    High: 29 °F

    Snow then
    Rain

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain before 7pm. Partly cloudy, with a low around 23. Calm wind. New precipitation amounts of less than a tenth of an inch possible.

    Low: 23 °F

    Chance Rain
    then Partly
    Cloudy

  • Christmas Day

    Christmas Day: Rain and snow likely before 2pm, then snow likely between 2pm and 4pm, then rain and snow likely after 4pm. Mostly cloudy, with a high near 30. Calm wind. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 30 °F

    Snow Likely
    then
    Rain/Snow
    Likely

  • Thursday Night

    Thursday Night: Rain and snow likely before 10pm, then a chance of rain between 10pm and 4am, then a chance of rain and snow after 4am. Mostly cloudy, with a low around 25. Calm wind. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    Low: 25 °F

    Rain/Snow
    Likely then
    Chance
    Rain/Snow

  • Friday

    Friday: Snow likely, mainly between 10am and 4pm. Partly sunny, with a high near 28. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 28 °F

    Snow Likely

  • Friday Night

    Friday Night: A 30 percent chance of snow before 10pm. Partly cloudy, with a low around 17. New snow accumulation of less than a half inch possible.

    Low: 17 °F

    Chance Snow
    then Partly
    Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 30.

    High: 30 °F

    Mostly Sunny

Detailed Forecast

Overnight
Snow. Steady temperature around 28. Calm wind. Chance of precipitation is 80%. Total nighttime snow accumulation of 1 to 3 inches possible.
Wednesday
Snow before noon, then rain. High near 29. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.
Wednesday Night
A 30 percent chance of rain before 7pm. Partly cloudy, with a low around 23. Calm wind. New precipitation amounts of less than a tenth of an inch possible.
Christmas Day
Rain and snow likely before 2pm, then snow likely between 2pm and 4pm, then rain and snow likely after 4pm. Mostly cloudy, with a high near 30. Calm wind. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Thursday Night
Rain and snow likely before 10pm, then a chance of rain between 10pm and 4am, then a chance of rain and snow after 4am. Mostly cloudy, with a low around 25. Calm wind. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Friday
Snow likely, mainly between 10am and 4pm. Partly sunny, with a high near 28. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Friday Night
A 30 percent chance of snow before 10pm. Partly cloudy, with a low around 17. New snow accumulation of less than a half inch possible.
Saturday
Mostly sunny, with a high near 30.
Saturday Night
Mostly cloudy, with a low around 18.
Sunday
Partly sunny, with a high near 30.
Sunday Night
Mostly cloudy, with a low around 22.
Monday
Mostly cloudy, with a high near 34.
Monday Night
Mostly cloudy, with a low around 26.
Tuesday
A slight chance of rain and snow. Partly sunny, with a high near 36. Chance of precipitation is 10%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WSW Winthrop WA
 48.45°N 120.24°W (Elev. 2402 ft)
Last Update:
1:12 am PST Dec 24, 2025
Forecast Valid:
1am PST Dec 24, 2025-6pm PST Dec 30, 2025
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation