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

Strong Storm System Brings Heavy Mountain Snow to the Sierra Nevada and Critical Fire Weather Conditions to the Plains

A Pacific storm system will continue to bring low elevation rain and mountain snow to much of the West through Wednesday, with heavy mountain snow expected in the higher elevations of the Sierra Nevada. This system will also bring strong winds to the Intermountain West, Rockies, and Plains, which will create Critical fire weather conditions for the High Plains. Read More >

Hazardous Weather Conditions

Current conditions at

Bearmouth I-90 MP 145.8 (MTBRM)

Lat: 46.71854°NLon: 113.29534°WElev: 3901.0ft.

NA

39°F

4°C

Humidity 78%
Wind Speed ESE 0 MPH
Barometer NA
Dewpoint 33°F (1°C)
Visibility NA
Last update 22 Apr 05:30 AM MDT
Extended Forecast for

Greenough MT

Winter Weather Advisory April 22, 06:00pm until April 24, 12:00pm
Click here for hazard details and duration
Winter Weather Advisory

  • Today

    Today: Rain and thunderstorms. High near 55. Calm wind becoming west 5 to 9 mph in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 90%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 55 °F

    Showers
    Likely then
    Showers

  • Tonight

    Tonight: Rain and snow before 4am, then a slight chance of rain between 4am and 5am. Snow level 5700 feet lowering to 4400 feet after midnight . Low around 32. West wind 5 to 8 mph becoming calm after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.

    Low: 32 °F

    Rain/Snow

  • Thursday

    Thursday: Rain and snow before noon, then snow showers between noon and 3pm, then rain and snow showers after 3pm. Some thunder is also possible. Snow level 3800 feet. High near 44. West southwest wind 3 to 6 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.

    High: 44 °F

    Rain/Snow

  • Thursday Night

    Thursday Night: Snow likely. Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 23. Light and variable wind. Chance of precipitation is 70%. New snow accumulation of 1 to 2 inches possible.

    Low: 23 °F

    Snow Likely
    and Patchy
    Fog

  • Friday

    Friday: Snow likely, mainly before noon. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 41. Calm wind becoming north northwest around 5 mph in the afternoon. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.

    High: 41 °F

    Snow Likely
    and Patchy
    Fog

  • Friday Night

    Friday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 18.

    Low: 18 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Saturday

    Saturday: A 20 percent chance of snow after noon. Partly sunny, with a high near 43.

    High: 43 °F

    Partly Sunny
    then Slight
    Chance Snow

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 19.

    Low: 19 °F

    Partly Cloudy

  • Sunday

    Sunday: A slight chance of snow. Partly sunny, with a high near 46.

    High: 46 °F

    Slight Chance
    Snow

Detailed Forecast

Today
Rain and thunderstorms. High near 55. Calm wind becoming west 5 to 9 mph in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 90%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
Rain and snow before 4am, then a slight chance of rain between 4am and 5am. Snow level 5700 feet lowering to 4400 feet after midnight . Low around 32. West wind 5 to 8 mph becoming calm after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.
Thursday
Rain and snow before noon, then snow showers between noon and 3pm, then rain and snow showers after 3pm. Some thunder is also possible. Snow level 3800 feet. High near 44. West southwest wind 3 to 6 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.
Thursday Night
Snow likely. Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 23. Light and variable wind. Chance of precipitation is 70%. New snow accumulation of 1 to 2 inches possible.
Friday
Snow likely, mainly before noon. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 41. Calm wind becoming north northwest around 5 mph in the afternoon. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
Friday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 18.
Saturday
A 20 percent chance of snow after noon. Partly sunny, with a high near 43.
Saturday Night
Partly cloudy, with a low around 19.
Sunday
A slight chance of snow. Partly sunny, with a high near 46.
Sunday Night
Mostly cloudy, with a low around 20.
Monday
A slight chance of rain. Mostly sunny, with a high near 53.
Monday Night
Partly cloudy, with a low around 25.
Tuesday
A slight chance of rain. Snow level 4200 feet rising to 6000 feet in the afternoon. Mostly sunny, with a high near 57.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Greenough MT
 46.92°N 113.45°W (Elev. 3783 ft)
Last Update:
2:01 am MDT Apr 22, 2026
Forecast Valid:
5am MDT Apr 22, 2026-6pm MDT Apr 28, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation