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 >

Hazardous Weather Conditions

Current conditions at

MAMMOTH AT YELLOWSTONE NATIONAL PARK (YLAW4)

Lat: 44.977222°NLon: 110.695278°WElev: 6138.0ft.

NA

40°F

4°C

Humidity 82%
Wind Speed SSW 9 MPH
Barometer NA
Dewpoint 35°F (2°C)
Visibility NA
Wind Chill34°F (1°C)
Last update 24 Dec 09:15 PM MST
Extended Forecast for

Norris WY

  • Tonight

    Tonight: Rain and snow showers. Snow level 8500 feet. Steady temperature around 37. Breezy, with a south southwest wind 11 to 15 mph, with gusts as high as 21 mph. Chance of precipitation is 100%. Total nighttime snow accumulation of less than a half inch possible.

    Low: 37 °F

    Rain/Snow and
    Breezy

  • Christmas Day

    Christmas Day: Snow showers, possibly mixed with rain, becoming all snow after 8am. Some thunder is also possible. High near 37. Breezy, with a south southwest wind 10 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

    High: 37 °F

    Rain/Snow and
    Breezy then
    Scattered
    Snow Showers

  • Thursday Night

    Thursday Night: Snow showers, mainly after 9pm. Some thunder is also possible. Low around 29. South southwest wind 7 to 13 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.

    Low: 29 °F

    Snow Showers

  • Friday

    Friday: Snow showers. Some thunder is also possible. High near 32. South southwest wind 9 to 13 mph. Chance of precipitation is 90%. New snow accumulation of 1 to 3 inches possible.

    High: 32 °F

    Snow Showers

  • Friday Night

    Friday Night: Snow showers likely, mainly after 11pm. Mostly cloudy, with a low around 17. Southwest wind around 11 mph, with gusts as high as 29 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 2 inches possible.

    Low: 17 °F

    Snow Showers
    Likely

  • Saturday

    Saturday: Snow showers. Some thunder is also possible. High near 25. West southwest wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.

    High: 25 °F

    Snow Showers

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around -3. West wind 3 to 6 mph.

    Low: -3 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 20.

    High: 20 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 2.

    Low: 2 °F

    Mostly Clear

Detailed Forecast

Tonight
Rain and snow showers. Snow level 8500 feet. Steady temperature around 37. Breezy, with a south southwest wind 11 to 15 mph, with gusts as high as 21 mph. Chance of precipitation is 100%. Total nighttime snow accumulation of less than a half inch possible.
Christmas Day
Snow showers, possibly mixed with rain, becoming all snow after 8am. Some thunder is also possible. High near 37. Breezy, with a south southwest wind 10 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Thursday Night
Snow showers, mainly after 9pm. Some thunder is also possible. Low around 29. South southwest wind 7 to 13 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.
Friday
Snow showers. Some thunder is also possible. High near 32. South southwest wind 9 to 13 mph. Chance of precipitation is 90%. New snow accumulation of 1 to 3 inches possible.
Friday Night
Snow showers likely, mainly after 11pm. Mostly cloudy, with a low around 17. Southwest wind around 11 mph, with gusts as high as 29 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 2 inches possible.
Saturday
Snow showers. Some thunder is also possible. High near 25. West southwest wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.
Saturday Night
Partly cloudy, with a low around -3. West wind 3 to 6 mph.
Sunday
Sunny, with a high near 20.
Sunday Night
Mostly clear, with a low around 2.
Monday
Mostly sunny, with a high near 27.
Monday Night
Partly cloudy, with a low around 7.
Tuesday
Mostly sunny, with a high near 33.
Tuesday Night
Partly cloudy, with a low around 11.
Wednesday
Sunny, with a high near 35.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Norris WY
 44.72°N 110.71°W (Elev. 7585 ft)
Last Update:
9:17 pm MST Dec 24, 2025
Forecast Valid:
10pm MST Dec 24, 2025-6pm MST Dec 31, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation