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

Heavy Rain and Mountain Snow Lingers in California; Winter Storm Impacting the Great Lakes and Northeast U.S.

An atmospheric river will wind down through today across California with lingering heavy rainfall, heavy mountain snow, and gusty winds. A wintry mix of freezing rain, sleet, and snow will cause hazardous travel conditions for the Great Lakes into the northern Mid-Atlantic and southern New England today through Saturday morning. Areas of tree damage and power outages are possible. Read More >

Hazardous Weather Conditions

Current conditions at

Bearmouth I-90 MP 145.8 (MTBRM)

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

unknown precip

31°F

-1°C

Humidity 95%
Wind Speed E 0 MPH
Barometer NA
Dewpoint 30°F (-1°C)
Visibility NA
Last update 27 Dec 12:31 AM MST
Extended Forecast for

Greenough MT

Winter Weather Advisory December 27, 12:49am until December 27, 08:00pm
Click here for hazard details and duration
Winter Weather Advisory
  •  
    Winter Weather Advisory December 27, 12:49am until December 27, 08:00pm

    NOW until 8:00pm Sat

    Winter Weather Advisory

  • Overnight

    Low: 20 °F

    Snow

  • Saturday

    Saturday: Snow likely, mainly after 1pm. Partly sunny, with a high near 28. West wind 8 to 15 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 28 °F

    Snow Likely

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 6. West wind 5 to 7 mph becoming calm in the evening.

    Low: 6 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 24. Calm wind.

    High: 24 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 8. Calm wind.

    Low: 8 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 29.

    High: 29 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 16.

    Low: 16 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Patchy fog between 8am and 9am. Otherwise, partly sunny, with a high near 35.

    High: 35 °F

    Patchy Fog
    then Partly
    Sunny

Detailed Forecast

Overnight
Snow, mainly before 2am. Low around 20. West southwest wind around 11 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. Total nighttime snow accumulation of 1 to 2 inches possible.
Saturday
Snow likely, mainly after 1pm. Partly sunny, with a high near 28. West wind 8 to 15 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Saturday Night
Partly cloudy, with a low around 6. West wind 5 to 7 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 24. Calm wind.
Sunday Night
Partly cloudy, with a low around 8. Calm wind.
Monday
Mostly sunny, with a high near 29.
Monday Night
Mostly cloudy, with a low around 16.
Tuesday
Patchy fog between 8am and 9am. Otherwise, partly sunny, with a high near 35.
Tuesday Night
Patchy fog before 2am, then patchy fog after 4am. Otherwise, partly cloudy, with a low around 16.
Wednesday
Partly sunny, with a high near 37.
Wednesday Night
Mostly cloudy, with a low around 19.
New Year's Day
A slight chance of rain and snow. Snow level rising to 4400 feet in the afternoon. Mostly cloudy, with a high near 38.
Thursday Night
A slight chance of snow. Snow level 4400 feet lowering to 3800 feet after midnight . Mostly cloudy, with a low around 20.
Friday
A chance of snow. Patchy fog. Otherwise, partly sunny, with a high near 36.
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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:
1:01 pm MST Dec 26, 2025
Forecast Valid:
12am MST Dec 27, 2025-6pm MST Jan 2, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation