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

Karst US-191 MP 55.3 (MTKAR)

Lat: 45.34534°NLon: 111.17261°WElev: 5699.0ft.

unknown precip

46°F

8°C

Humidity 44%
Wind Speed SE 11 MPH
Barometer NA
Dewpoint 25°F (-4°C)
Visibility NA
Wind Chill41°F (5°C)
Last update 24 Dec 07:30 AM MST
Extended Forecast for

13 Miles ESE Big Sky MT

  • Today

    Today: A slight chance of snow between 4pm and 5pm, then a chance of rain and snow. Increasing clouds, with a high near 34. Windy, with a south southwest wind 28 to 30 mph, with gusts as high as 45 mph. Chance of precipitation is 30%. Total daytime snow accumulation of less than a half inch possible.

    High: 34 °F

    Mostly Sunny
    and Windy
    then Chance
    Rain/Snow and
    Breezy

  • Tonight

    Tonight: Rain and snow before 3am, then snow between 3am and 5am, then rain and snow after 5am. Low around 30. Windy, with a south wind 25 to 31 mph, with gusts as high as 43 mph. Chance of precipitation is 80%. New snow accumulation of around an inch possible.

    Low: 30 °F

    Rain/Snow and
    Windy

  • Christmas Day

    Christmas Day: Rain and snow, becoming all snow after 7am. Temperature falling to around 28 by 5pm. Breezy, with a southwest wind 20 to 23 mph, with gusts as high as 31 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.

    High: 33 °F⇓

    Rain/Snow and
    Breezy then
    Chance Snow

  • Thursday Night

    Thursday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 26. Breezy, with a south southwest wind 22 to 26 mph, with gusts as high as 36 mph. New snow accumulation of around an inch possible.

    Low: 26 °F

    Chance Snow
    and Breezy

  • Friday

    Friday: Snow. High near 26. Breezy, with a south southwest wind 26 to 28 mph, with gusts as high as 41 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.

    High: 26 °F

    Snow and
    Breezy

  • Friday Night

    Friday Night: A 30 percent chance of snow. Mostly cloudy, with a low around 15. Windy, with a southwest wind 29 to 32 mph, with gusts as high as 43 mph. New snow accumulation of less than one inch possible.

    Low: 15 °F

    Chance Snow
    and Windy

  • Saturday

    Saturday: A 50 percent chance of snow. Partly sunny, with a high near 16. Breezy, with a west wind 18 to 28 mph, with gusts as high as 37 mph. New snow accumulation of less than a half inch possible.

    High: 16 °F

    Chance Snow
    and Breezy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 7. Southwest wind 11 to 14 mph, with gusts as high as 21 mph.

    Low: 7 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 19.

    High: 19 °F

    Partly Sunny

Detailed Forecast

Today
A slight chance of snow between 4pm and 5pm, then a chance of rain and snow. Increasing clouds, with a high near 34. Windy, with a south southwest wind 28 to 30 mph, with gusts as high as 45 mph. Chance of precipitation is 30%. Total daytime snow accumulation of less than a half inch possible.
Tonight
Rain and snow before 3am, then snow between 3am and 5am, then rain and snow after 5am. Low around 30. Windy, with a south wind 25 to 31 mph, with gusts as high as 43 mph. Chance of precipitation is 80%. New snow accumulation of around an inch possible.
Christmas Day
Rain and snow, becoming all snow after 7am. Temperature falling to around 28 by 5pm. Breezy, with a southwest wind 20 to 23 mph, with gusts as high as 31 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.
Thursday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 26. Breezy, with a south southwest wind 22 to 26 mph, with gusts as high as 36 mph. New snow accumulation of around an inch possible.
Friday
Snow. High near 26. Breezy, with a south southwest wind 26 to 28 mph, with gusts as high as 41 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.
Friday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 15. Windy, with a southwest wind 29 to 32 mph, with gusts as high as 43 mph. New snow accumulation of less than one inch possible.
Saturday
A 50 percent chance of snow. Partly sunny, with a high near 16. Breezy, with a west wind 18 to 28 mph, with gusts as high as 37 mph. New snow accumulation of less than a half inch possible.
Saturday Night
Partly cloudy, with a low around 7. Southwest wind 11 to 14 mph, with gusts as high as 21 mph.
Sunday
Partly sunny, with a high near 19.
Sunday Night
Partly cloudy, with a low around 11.
Monday
Mostly sunny, with a high near 27.
Monday Night
Partly cloudy, with a low around 17.
Tuesday
Partly sunny, with a high near 29.
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ABOUT THIS FORECAST

 
Point Forecast:
13 Miles ESE Big Sky MT
 45.23°N 111.07°W (Elev. 9354 ft)
Last Update:
7:38 am MST Dec 24, 2025
Forecast Valid:
7am MST Dec 24, 2025-6pm MST Dec 30, 2025
 
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