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

Major Winter Storm Ongoing in the Upper Midwest; Severe Weather Tonight from the Mid-South to the Ohio Valley

A major winter storm will continue to bring blizzard conditions, heavy snowfall, icing, and strong winds through Monday across the Upper Midwest and Upper Great Lakes. A line of storms will be capable of producing widespread damaging winds, tornadoes, and some large hail from the Mid-South to the Ohio Valley and the Southeast through tonight, moving into the Mid-Atlantic Monday. Read More >

Hazardous Weather Conditions

Current conditions at

FLATTOP MTN. (FTMM8)

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

NA

16°F

-9°C

Humidity 85%
Wind Speed NA NA MPH
Barometer NA
Dewpoint 12°F (-11°C)
Visibility NA
Last update 15 Mar 06:00 PM MDT
Extended Forecast for

16 Miles W St Mary MT

Winter Weather Advisory March 16, 03:00am until March 16, 12:00pm
High Wind Warning March 16, 09:00am until March 17, 06:00pm
Click here for hazard details and duration
Winter Weather Advisory
High Wind Warning

  • Tonight

    Tonight: A 20 percent chance of snow. Patchy blowing snow after 2am. Cloudy, with a low around 11. Wind chill values as low as -5. Breezy, with a southwest wind 16 to 23 mph, with gusts as high as 29 mph.

    Low: 11 °F

    Slight Chance
    Snow and
    Patchy
    Blowing Snow

  • Monday

    Monday: A 50 percent chance of snow, mainly after noon. Patchy blowing snow before noon. Cloudy, with a high near 31. Wind chill values as low as -5. Breezy, with a southwest wind 24 to 28 mph, with gusts as high as 39 mph. New snow accumulation of 1 to 2 inches possible.

    High: 31 °F

    Chance Snow
    and Patchy
    Blowing Snow

  • Monday Night

    Monday Night: A 50 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 28. Windy, with a southwest wind 28 to 33 mph, with gusts as high as 44 mph. New snow accumulation of less than a half inch possible.

    Low: 28 °F

    Chance Snow
    and Breezy
    then Slight
    Chance Snow
    and Windy

  • Tuesday

    Tuesday: A 30 percent chance of snow, mainly after noon. Mostly cloudy, with a high near 33. Windy, with a southwest wind 25 to 32 mph, with gusts as high as 41 mph. New snow accumulation of less than a half inch possible.

    High: 33 °F

    Chance Snow
    and Windy

  • Tuesday Night

    Tuesday Night: Snow likely. Cloudy, with a low around 31. Breezy, with a west southwest wind 23 to 25 mph, with gusts as high as 33 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 31 °F

    Snow Likely
    and Breezy

  • Wednesday

    Wednesday: A chance of snow before 3pm, then a chance of rain and snow. Mostly cloudy, with a high near 34. Breezy, with a southwest wind 24 to 26 mph, with gusts as high as 37 mph. Chance of precipitation is 40%. New snow accumulation of less than a half inch possible.

    High: 34 °F

    Breezy.
    Chance Snow
    then Chance
    Rain/Snow

  • Wednesday Night

    Wednesday Night: A chance of rain and snow before midnight, then a chance of rain between midnight and 3am, then a chance of rain and snow after 3am. Mostly cloudy, with a low around 33. Breezy, with a southwest wind 23 to 25 mph, with gusts as high as 34 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.

    Low: 33 °F

    Chance
    Rain/Snow and
    Breezy

  • Thursday

    Thursday: A chance of rain and snow before noon, then a chance of rain between noon and 3pm, then a chance of rain and snow after 3pm. Mostly cloudy, with a high near 39. Breezy, with a southwest wind 23 to 26 mph, with gusts as high as 39 mph.

    High: 39 °F

    Chance
    Rain/Snow and
    Breezy

  • Thursday Night

    Thursday Night: A chance of rain and snow before midnight, then a chance of rain between midnight and 3am, then a chance of rain and snow after 3am. Mostly cloudy, with a low around 33. Breezy.

    Low: 33 °F

    Chance
    Rain/Snow and
    Breezy

Detailed Forecast

Tonight
A 20 percent chance of snow. Patchy blowing snow after 2am. Cloudy, with a low around 11. Wind chill values as low as -5. Breezy, with a southwest wind 16 to 23 mph, with gusts as high as 29 mph.
Monday
A 50 percent chance of snow, mainly after noon. Patchy blowing snow before noon. Cloudy, with a high near 31. Wind chill values as low as -5. Breezy, with a southwest wind 24 to 28 mph, with gusts as high as 39 mph. New snow accumulation of 1 to 2 inches possible.
Monday Night
A 50 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 28. Windy, with a southwest wind 28 to 33 mph, with gusts as high as 44 mph. New snow accumulation of less than a half inch possible.
Tuesday
A 30 percent chance of snow, mainly after noon. Mostly cloudy, with a high near 33. Windy, with a southwest wind 25 to 32 mph, with gusts as high as 41 mph. New snow accumulation of less than a half inch possible.
Tuesday Night
Snow likely. Cloudy, with a low around 31. Breezy, with a west southwest wind 23 to 25 mph, with gusts as high as 33 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Wednesday
A chance of snow before 3pm, then a chance of rain and snow. Mostly cloudy, with a high near 34. Breezy, with a southwest wind 24 to 26 mph, with gusts as high as 37 mph. Chance of precipitation is 40%. New snow accumulation of less than a half inch possible.
Wednesday Night
A chance of rain and snow before midnight, then a chance of rain between midnight and 3am, then a chance of rain and snow after 3am. Mostly cloudy, with a low around 33. Breezy, with a southwest wind 23 to 25 mph, with gusts as high as 34 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.
Thursday
A chance of rain and snow before noon, then a chance of rain between noon and 3pm, then a chance of rain and snow after 3pm. Mostly cloudy, with a high near 39. Breezy, with a southwest wind 23 to 26 mph, with gusts as high as 39 mph.
Thursday Night
A chance of rain and snow before midnight, then a chance of rain between midnight and 3am, then a chance of rain and snow after 3am. Mostly cloudy, with a low around 33. Breezy.
Friday
Snow likely. Mostly cloudy, with a high near 38. Breezy.
Friday Night
Snow likely. Mostly cloudy, with a low around 31. Breezy.
Saturday
A chance of snow. Mostly cloudy, with a high near 40.
Saturday Night
A chance of snow. Mostly cloudy, with a low around 22. Breezy.
Sunday
A slight chance of snow. Mostly sunny, with a high near 34. Breezy.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
16 Miles W St Mary MT
 48.79°N 113.77°W (Elev. 7480 ft)
Last Update:
7:53 pm MDT Mar 15, 2026
Forecast Valid:
10pm MDT Mar 15, 2026-6pm MDT Mar 22, 2026
 
Forecast Discussion
 
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Additional Resources

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