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

Lost Trail Pass (ITD87)

Lat: 45.69302°NLon: 113.94835°WElev: 7090.0ft.

light snow

32°F

0°C

Humidity 91%
Wind Speed SSW 8 MPH
Barometer NA
Dewpoint 30°F (-1°C)
Visibility 1.24 mi
Wind Chill25°F (-4°C)
Last update 25 Dec 09:15 PM MST
Extended Forecast for

Lost Trail Pass MT

Winter Weather Advisory December 26, 02:00am until December 27, 08:00pm
Click here for hazard details and duration
Winter Weather Advisory

  • Tonight

    Tonight: A 50 percent chance of snow after 5am. The snow could be heavy at times. Mostly cloudy, with a low around 23. South wind around 6 mph. Total nighttime snow accumulation of 2 to 4 inches possible.

    Low: 23 °F

    Heavy Snow

  • Friday

    Friday: Snow, mainly before 1pm. High near 30. Southwest wind 7 to 12 mph increasing to 15 to 20 mph in the morning. Winds could gust as high as 36 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.

    High: 30 °F

    Snow then
    Chance Snow

  • Friday Night

    Friday Night: Snow, mainly after 11pm. Low around 13. Wind chill values as low as zero. South southwest wind 15 to 17 mph, with gusts as high as 41 mph. Chance of precipitation is 80%. New snow accumulation of 2 to 4 inches possible.

    Low: 13 °F

    Snow

  • Saturday

    Saturday: Snow. High near 17. Wind chill values as low as -4. West northwest wind 11 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New snow accumulation of 1 to 2 inches possible.

    High: 17 °F

    Snow

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around -3. West northwest wind 5 to 10 mph becoming light west in the evening.

    Low: -3 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 16.

    High: 16 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 4.

    Low: 4 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 22.

    High: 22 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 14.

    Low: 14 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A 50 percent chance of snow after 5am. The snow could be heavy at times. Mostly cloudy, with a low around 23. South wind around 6 mph. Total nighttime snow accumulation of 2 to 4 inches possible.
Friday
Snow, mainly before 1pm. High near 30. Southwest wind 7 to 12 mph increasing to 15 to 20 mph in the morning. Winds could gust as high as 36 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.
Friday Night
Snow, mainly after 11pm. Low around 13. Wind chill values as low as zero. South southwest wind 15 to 17 mph, with gusts as high as 41 mph. Chance of precipitation is 80%. New snow accumulation of 2 to 4 inches possible.
Saturday
Snow. High near 17. Wind chill values as low as -4. West northwest wind 11 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New snow accumulation of 1 to 2 inches possible.
Saturday Night
Partly cloudy, with a low around -3. West northwest wind 5 to 10 mph becoming light west in the evening.
Sunday
Mostly sunny, with a high near 16.
Sunday Night
Mostly clear, with a low around 4.
Monday
Mostly sunny, with a high near 22.
Monday Night
Mostly cloudy, with a low around 14.
Tuesday
Partly sunny, with a high near 28.
Tuesday Night
Mostly cloudy, with a low around 19.
Wednesday
Partly sunny, with a high near 31.
Wednesday Night
A slight chance of snow. Mostly cloudy, with a low around 20.
New Year's Day
A chance of snow. Partly sunny, with a high near 32.
Basemap Options
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lost Trail Pass MT
 45.68°N 113.94°W (Elev. 7077 ft)
Last Update:
1:01 pm MST Dec 25, 2025
Forecast Valid:
9pm MST Dec 25, 2025-6pm MST Jan 1, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation