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 89%
Wind Speed WNW 1 MPH
Barometer NA
Dewpoint 27°F (-3°C)
Visibility NA
Last update 23 Dec 08:06 PM PST
Extended Forecast for

19 Miles NNE Mazama WA

Winter Weather Advisory December 23, 10:00pm until December 24, 04:00pm
Click here for hazard details and duration
Winter Weather Advisory

  • Tonight

    Tonight: Snow likely, mainly after 1am. Mostly cloudy, with a temperature rising to around 23 by 5am. Southeast wind 8 to 11 mph. Chance of precipitation is 60%. Total nighttime snow accumulation of 1 to 3 inches possible.

    Low: 16 °F⇑

    Snow Likely

  • Wednesday

    Wednesday: Snow, mainly before 4pm. The snow could be heavy at times. High near 28. Southeast wind 12 to 17 mph becoming north 6 to 11 mph in the morning. Winds could gust as high as 37 mph. Chance of precipitation is 100%. New snow accumulation of 5 to 9 inches possible.

    High: 28 °F

    Heavy Snow

  • Wednesday Night

    Wednesday Night: A chance of snow before 7pm, then a slight chance of snow after 4am. Mostly cloudy, then gradually becoming mostly clear, with a low around 15. Southwest wind 7 to 15 mph, with gusts as high as 32 mph. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.

    Low: 15 °F

    Chance Snow

  • Christmas Day

    Christmas Day: Snow, mainly after 10am. High near 24. West wind around 7 mph becoming south in the morning. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.

    High: 24 °F

    Snow

  • Thursday Night

    Thursday Night: Snow, mainly before 10pm. Low around 19. West wind 7 to 9 mph. Chance of precipitation is 90%. New snow accumulation of 1 to 2 inches possible.

    Low: 19 °F

    Snow then
    Snow Likely

  • Friday

    Friday: Snow, mainly before 4pm. High near 22. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    High: 22 °F

    Snow

  • Friday Night

    Friday Night: A 50 percent chance of snow before 10pm. Mostly cloudy, with a low around 8. New snow accumulation of less than a half inch possible.

    Low: 8 °F

    Chance Snow
    then Mostly
    Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 16.

    High: 16 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of snow after 10pm. Mostly cloudy, with a low around 10.

    Low: 10 °F

    Slight Chance
    Snow

Detailed Forecast

Tonight
Snow likely, mainly after 1am. Mostly cloudy, with a temperature rising to around 23 by 5am. Southeast wind 8 to 11 mph. Chance of precipitation is 60%. Total nighttime snow accumulation of 1 to 3 inches possible.
Wednesday
Snow, mainly before 4pm. The snow could be heavy at times. High near 28. Southeast wind 12 to 17 mph becoming north 6 to 11 mph in the morning. Winds could gust as high as 37 mph. Chance of precipitation is 100%. New snow accumulation of 5 to 9 inches possible.
Wednesday Night
A chance of snow before 7pm, then a slight chance of snow after 4am. Mostly cloudy, then gradually becoming mostly clear, with a low around 15. Southwest wind 7 to 15 mph, with gusts as high as 32 mph. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.
Christmas Day
Snow, mainly after 10am. High near 24. West wind around 7 mph becoming south in the morning. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.
Thursday Night
Snow, mainly before 10pm. Low around 19. West wind 7 to 9 mph. Chance of precipitation is 90%. New snow accumulation of 1 to 2 inches possible.
Friday
Snow, mainly before 4pm. High near 22. Chance of precipitation is 80%. 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 8. New snow accumulation of less than a half inch possible.
Saturday
Partly sunny, with a high near 16.
Saturday Night
A 20 percent chance of snow after 10pm. Mostly cloudy, with a low around 10.
Sunday
A 20 percent chance of snow before 10am. Mostly cloudy, with a high near 24.
Sunday Night
Mostly cloudy, with a low around 16.
Monday
Mostly cloudy, with a high near 29.
Monday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 22.
Tuesday
A 20 percent chance of snow. Mostly cloudy, with a high near 32.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
19 Miles NNE Mazama WA
 48.87°N 120.3°W (Elev. 6631 ft)
Last Update:
8:38 pm PST Dec 23, 2025
Forecast Valid:
9pm PST Dec 23, 2025-6pm PST Dec 30, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation