National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Lake Effect Snow through Friday; Heavy Rain, Thunderstorms and Mountain Snow in California

Periods of moderate to heavy lake effect snow will continue through Friday downwind of Lake Erie and Ontario. Several additional inches of accumulating snow are expected. A Pacific storm will bring heavy rain and mountain snow across California, the Southwest and Intermountain West today. Isolated severe thunderstorms and scattered flash flooding is possible across parts of southern California. Read More >

Current conditions at

FLATTOP MTN. (FTMM8)

Lat: 48.80225°NLon: 113.85713°WElev: 6300.0ft.

NA

16°F

-9°C

Humidity 91%
Wind Speed NA NA MPH
Barometer NA
Dewpoint 14°F (-10°C)
Visibility NA
Last update 01 Jan 02:00 AM MST
Extended Forecast for

16 Miles W St Mary MT

  • New Year's Day

    New Year's Day: Mostly cloudy, with a high near 24. Southwest wind 10 to 14 mph, with gusts as high as 20 mph.

    High: 24 °F

    Mostly Cloudy

  • Tonight

    Tonight: Snow likely, mainly after 5am. Cloudy, with a low around 21. Southwest wind 14 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 21 °F

    Chance Snow
    then Snow
    Likely

  • Friday

    Friday: Snow. High near 27. Southwest wind 17 to 21 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.

    High: 27 °F

    Snow

  • Friday Night

    Friday Night: A 30 percent chance of snow. Cloudy, with a low around 25. West southwest wind 15 to 21 mph, with gusts as high as 29 mph. New snow accumulation of around an inch possible.

    Low: 25 °F

    Chance Snow

  • Saturday

    Saturday: A 50 percent chance of snow. Mostly cloudy, with a high near 27. Southwest wind 13 to 15 mph, with gusts as high as 23 mph. New snow accumulation of less than one inch possible.

    High: 27 °F

    Chance Snow

  • Saturday Night

    Saturday Night: Snow likely, mainly after 11pm. Mostly cloudy, with a low around 25. Southwest wind 15 to 18 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 3 inches possible.

    Low: 25 °F

    Snow Likely

  • Sunday

    Sunday: Snow likely. Mostly cloudy, with a high near 27. Southwest wind around 21 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New snow accumulation of around an inch possible.

    High: 27 °F

    Snow Likely

  • Sunday Night

    Sunday Night: A chance of snow. Mostly cloudy, with a low around 21. Breezy, with a west southwest wind 20 to 22 mph, with gusts as high as 28 mph.

    Low: 21 °F

    Chance Snow
    and Breezy

  • Monday

    Monday: A chance of snow. Mostly cloudy, with a high near 24.

    High: 24 °F

    Chance Snow

Detailed Forecast

New Year's Day
Mostly cloudy, with a high near 24. Southwest wind 10 to 14 mph, with gusts as high as 20 mph.
Tonight
Snow likely, mainly after 5am. Cloudy, with a low around 21. Southwest wind 14 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Friday
Snow. High near 27. Southwest wind 17 to 21 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.
Friday Night
A 30 percent chance of snow. Cloudy, with a low around 25. West southwest wind 15 to 21 mph, with gusts as high as 29 mph. New snow accumulation of around an inch possible.
Saturday
A 50 percent chance of snow. Mostly cloudy, with a high near 27. Southwest wind 13 to 15 mph, with gusts as high as 23 mph. New snow accumulation of less than one inch possible.
Saturday Night
Snow likely, mainly after 11pm. Mostly cloudy, with a low around 25. Southwest wind 15 to 18 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 3 inches possible.
Sunday
Snow likely. Mostly cloudy, with a high near 27. Southwest wind around 21 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New snow accumulation of around an inch possible.
Sunday Night
A chance of snow. Mostly cloudy, with a low around 21. Breezy, with a west southwest wind 20 to 22 mph, with gusts as high as 28 mph.
Monday
A chance of snow. Mostly cloudy, with a high near 24.
Monday Night
A chance of snow. Mostly cloudy, with a low around 18.
Tuesday
A chance of snow. Mostly cloudy, with a high near 21. Breezy.
Tuesday Night
A chance of snow. Mostly cloudy, with a low around 17. Breezy.
Wednesday
A chance of snow. Mostly cloudy, with a high near 21. Breezy.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
16 Miles W St Mary MT
 48.79°N 113.77°W (Elev. 7480 ft)
Last Update:
3:32 am MST Jan 1, 2026
Forecast Valid:
11am MST Jan 1, 2026-6pm MST Jan 7, 2026
 
Forecast Discussion
 
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