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

28°F

-2°C

Humidity 100%
Wind Speed NW 0 MPH
Barometer NA
Dewpoint 28°F (-2°C)
Visibility NA
Last update 25 Dec 05:06 AM PST
Extended Forecast for

20 Miles N Mazama WA

  • Christmas Day

    Christmas Day: Snow, mainly after 1pm. High near 23. Southeast wind around 11 mph. Chance of precipitation is 80%. Total daytime snow accumulation of 1 to 3 inches possible.

    High: 23 °F

    Chance Snow
    then Snow

  • Tonight

    Tonight: Snow likely before 1am, then a slight chance of snow after 4am. Mostly cloudy, with a low around 16. Southwest wind around 14 mph. Chance of precipitation is 60%. New snow accumulation of around an inch possible.

    Low: 16 °F

    Snow Likely

  • Friday

    Friday: Snow, mainly after 10am. Temperature falling to around 13 by 5pm. Wind chill values as low as -3. South wind around 16 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New snow accumulation of 1 to 3 inches possible.

    High: 19 °F⇓

    Snow

  • Friday Night

    Friday Night: Snow, mainly before 10pm. Low around -1. Wind chill values as low as -21. Blustery, with a northwest wind around 18 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.

    Low: -1 °F

    Blustery.
    Snow then
    Chance Snow

  • Saturday

    Saturday: Mostly sunny and cold, with a high near 6. Northwest wind 10 to 16 mph.

    High: 6 °F

    Cold

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 1.

    Low: 1 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 18.

    High: 18 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 13.

    Low: 13 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 24.

    High: 24 °F

    Mostly Cloudy

Detailed Forecast

Christmas Day
Snow, mainly after 1pm. High near 23. Southeast wind around 11 mph. Chance of precipitation is 80%. Total daytime snow accumulation of 1 to 3 inches possible.
Tonight
Snow likely before 1am, then a slight chance of snow after 4am. Mostly cloudy, with a low around 16. Southwest wind around 14 mph. Chance of precipitation is 60%. New snow accumulation of around an inch possible.
Friday
Snow, mainly after 10am. Temperature falling to around 13 by 5pm. Wind chill values as low as -3. South wind around 16 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New snow accumulation of 1 to 3 inches possible.
Friday Night
Snow, mainly before 10pm. Low around -1. Wind chill values as low as -21. Blustery, with a northwest wind around 18 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.
Saturday
Mostly sunny and cold, with a high near 6. Northwest wind 10 to 16 mph.
Saturday Night
Mostly cloudy, with a low around 1.
Sunday
Mostly cloudy, with a high near 18.
Sunday Night
Mostly cloudy, with a low around 13.
Monday
Mostly cloudy, with a high near 24.
Monday Night
Mostly cloudy, with a low around 19.
Tuesday
Mostly cloudy, with a high near 28.
Tuesday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 23.
Wednesday
A 30 percent chance of snow. Mostly cloudy, with a high near 27.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
20 Miles N Mazama WA
 48.9°N 120.37°W (Elev. 7178 ft)
Last Update:
2:17 am PST Dec 25, 2025
Forecast Valid:
5am PST Dec 25, 2025-6pm PST Dec 31, 2025
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation