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

13 Miles NNE Mazama 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: 18 °F

    Snow Likely

  • Wednesday

    Wednesday: Rain, snow, and freezing rain, mainly before 4pm. The snow could be heavy at times. High near 34. Southeast wind 8 to 15 mph becoming northeast in the morning. Winds could gust as high as 29 mph. Chance of precipitation is 100%. Little or no ice accumulation expected. New snow accumulation of 3 to 7 inches possible.

    High: 34 °F

    Wintry Mix

  • Wednesday Night

    Wednesday Night: A chance of snow before 7pm, then a slight chance of snow after 4am. Partly cloudy, with a low around 20. Southwest wind 6 to 13 mph, with gusts as high as 28 mph. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.

    Low: 20 °F

    Chance Snow

  • Christmas Day

    Christmas Day: Snow, mainly after 10am. High near 31. North wind around 5 mph becoming southeast in the afternoon. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.

    High: 31 °F

    Snow

  • Thursday Night

    Thursday Night: Snow, mainly before 10pm. Low around 23. West wind around 6 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.

    Low: 23 °F

    Snow

  • Friday

    Friday: Snow, mainly before 4pm. High near 29. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.

    High: 29 °F

    Snow

  • Friday Night

    Friday Night: A 50 percent chance of snow before 10pm. Mostly cloudy, with a low around 12. New snow accumulation of less than a half inch possible.

    Low: 12 °F

    Chance Snow
    then Mostly
    Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 24.

    High: 24 °F

    Mostly Sunny

Detailed Forecast

Overnight
Snow likely. Mostly cloudy, with a low around 18. Southeast wind around 10 mph. Chance of precipitation is 60%. Total nighttime snow accumulation of 2 to 4 inches possible.
Wednesday
Rain, snow, and freezing rain, mainly before 4pm. The snow could be heavy at times. High near 34. Southeast wind 8 to 15 mph becoming northeast in the morning. Winds could gust as high as 29 mph. Chance of precipitation is 100%. Little or no ice accumulation expected. New snow accumulation of 3 to 7 inches possible.
Wednesday Night
A chance of snow before 7pm, then a slight chance of snow after 4am. Partly cloudy, with a low around 20. Southwest wind 6 to 13 mph, with gusts as high as 28 mph. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.
Christmas Day
Snow, mainly after 10am. High near 31. North wind around 5 mph becoming southeast in the afternoon. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.
Thursday Night
Snow, mainly before 10pm. Low around 23. West wind around 6 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.
Friday
Snow, mainly before 4pm. High near 29. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.
Friday Night
A 50 percent chance of snow before 10pm. Mostly cloudy, with a low around 12. New snow accumulation of less than a half inch possible.
Saturday
Mostly sunny, with a high near 24.
Saturday Night
A 10 percent chance of snow after 4am. Mostly cloudy, with a low around 13.
Sunday
A 20 percent chance of snow before 10am. Mostly cloudy, with a high near 30.
Sunday Night
Mostly cloudy, with a low around 19.
Monday
Mostly cloudy, with a high near 35.
Monday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 24.
Tuesday
A slight chance of rain and snow. Partly sunny, with a high near 37. Chance of precipitation is 20%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
13 Miles NNE Mazama WA
 48.78°N 120.31°W (Elev. 4570 ft)
Last Update:
9:17 pm PST Dec 23, 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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Chance of Precipitation