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

Prolonged Atmospheric River Will Impact the Northwest Early this Week

A weather system in the Pacific Northwest will produce rain throughout the day, before a potent atmospheric river produces a prolonged round of heavy rainfall, widespread urban and river flooding, and high elevation snow to the region Monday through Wednesday. Showers and thunderstorms may produce isolated damaging winds, a brief tornado, and locally heavy rainfall across parts of Florida today. 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

33°F

1°C

Humidity 99%
Wind Speed W 1 MPH
Barometer NA
Dewpoint 33°F (1°C)
Visibility NA
Last update 08 Dec 01:31 AM MST
Extended Forecast for

Potomac MT

  • Overnight

    Overnight: A slight chance of rain after 3am, mixing with snow after 5am. Mostly cloudy, with a low around 32. West wind around 7 mph, with gusts as high as 18 mph. Chance of precipitation is 20%.

    Low: 32 °F

    Slight Chance
    Rain/Snow

  • Monday

    Monday: A chance of rain and snow before 1pm, then rain. High near 43. West southwest wind around 7 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    High: 43 °F

    Chance
    Rain/Snow
    then Rain

  • Monday Night

    Monday Night: Rain. Low around 35. West southwest wind 8 to 11 mph, with gusts as high as 29 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 35 °F

    Rain

  • Tuesday

    Tuesday: Rain before 5pm, then snow likely, possibly mixed with rain. Snow level 6600 feet lowering to 4400 feet in the afternoon . High near 44. West wind around 11 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.

    High: 44 °F

    Rain then
    Rain/Snow
    Likely

  • Tuesday Night

    Tuesday Night: Rain, possibly mixed with snow. Snow level 4100 feet rising to 5100 feet after midnight. Low around 32. Light south wind. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

    Low: 32 °F

    Rain/Snow

  • Wednesday

    Wednesday: Rain. High near 46. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 46 °F

    Rain

  • Wednesday Night

    Wednesday Night: Rain. Low around 37. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 37 °F

    Rain

  • Thursday

    Thursday: Rain, possibly mixed with snow. Cloudy, with a high near 44.

    High: 44 °F

    Rain/Snow

  • Thursday Night

    Thursday Night: Rain and snow likely. Cloudy, with a low around 31.

    Low: 31 °F

    Rain/Snow
    Likely

Detailed Forecast

Overnight
A slight chance of rain after 3am, mixing with snow after 5am. Mostly cloudy, with a low around 32. West wind around 7 mph, with gusts as high as 18 mph. Chance of precipitation is 20%.
Monday
A chance of rain and snow before 1pm, then rain. High near 43. West southwest wind around 7 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Monday Night
Rain. Low around 35. West southwest wind 8 to 11 mph, with gusts as high as 29 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday
Rain before 5pm, then snow likely, possibly mixed with rain. Snow level 6600 feet lowering to 4400 feet in the afternoon . High near 44. West wind around 11 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.
Tuesday Night
Rain, possibly mixed with snow. Snow level 4100 feet rising to 5100 feet after midnight. Low around 32. Light south wind. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Wednesday
Rain. High near 46. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday Night
Rain. Low around 37. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Thursday
Rain, possibly mixed with snow. Cloudy, with a high near 44.
Thursday Night
Rain and snow likely. Cloudy, with a low around 31.
Friday
A chance of rain and snow. Mostly cloudy, with a high near 45.
Friday Night
A slight chance of rain. Mostly cloudy, with a low around 27.
Saturday
A slight chance of rain and snow. Partly sunny, with a high near 43.
Saturday Night
A slight chance of rain and snow. Snow level 5300 feet lowering to 4500 feet after midnight . Mostly cloudy, with a low around 27.
Sunday
A chance of rain and snow. Snow level 4300 feet rising to 5100 feet in the afternoon. Mostly cloudy, with a high near 43.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Potomac MT
 46.89°N 113.59°W (Elev. 3589 ft)
Last Update:
1:02 am MST Dec 8, 2025
Forecast Valid:
1am MST Dec 8, 2025-6pm MST Dec 14, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation