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

Prolonged Atmospheric River in the Northwest; Snow in the North-Central US

A prolonged atmospheric river will bring heavy rainfall which may lead to widespread urban and river flooding, heavy mountain snow, along with gusty winds to the Pacific Northwest into the northern Rockies through much of the week. A clipper will bring a period of snow across the upper Midwest and the Great Lakes into Tuesday, before a stronger system bring more wintry impacts. Read More >

Hazardous Weather Conditions

Current conditions at

Sidney-Richland (KSDY)

Lat: 47.7°NLon: 104.2°WElev: 1985.0ft.

Clear

37°F

3°C

Humidity 74%
Wind Speed WSW 13 MPH
Barometer 29.77 in (1008.13 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 08 Dec 06:35 PM MST
Extended Forecast for

Lambert MT

Winter Weather Advisory December 8, 11:00pm until December 9, 02:00pm
High Wind Warning December 8, 11:00pm until December 9, 05:00pm
Click here for hazard details and duration
Winter Weather Advisory
High Wind Warning

  • Tonight

    Tonight: Rain likely, mainly between 1am and 5am. Mostly cloudy, with a temperature falling to near 29 by 9pm, then rising to around 37 during the remainder of the night. Breezy, with a southwest wind 10 to 15 mph increasing to 21 to 26 mph after midnight. Winds could gust as high as 40 mph. Chance of precipitation is 70%.

    Low: 29 °F⇑

    Mostly Cloudy
    then Rain
    Likely and
    Breezy

  • Tuesday

    Tuesday: A 40 percent chance of rain, mainly before 9am. Cloudy through mid morning, then gradual clearing, with a temperature rising to near 41 by 10am, then falling to around 32 during the remainder of the day. Windy, with a west northwest wind 31 to 37 mph, with gusts as high as 55 mph.

    High: 41 °F⇓

    Windy. Chance
    Rain then
    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 7. Wind chill values between zero and 5. Blustery, with a west northwest wind 17 to 22 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 31 mph.

    Low: 7 °F

    Mostly Clear
    and Blustery
    then Partly
    Cloudy

  • Wednesday

    Wednesday: Snow likely after 11am. Mostly cloudy, with a high near 29. Light and variable wind becoming east southeast 5 to 10 mph in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 2 inches possible.

    High: 29 °F

    Snow Likely

  • Wednesday Night

    Wednesday Night: Snow likely before 11pm, then a chance of freezing rain between 11pm and 2am, then a chance of snow after 2am. Cloudy, with a low around 15. East southeast wind around 10 mph becoming west northwest after midnight. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 15 °F

    Wintry Mix
    Likely then
    Chance Wintry
    Mix

  • Thursday

    Thursday: A 50 percent chance of snow. Mostly cloudy, with a high near 24. North northwest wind 11 to 18 mph, with gusts as high as 25 mph. New snow accumulation of 1 to 3 inches possible.

    High: 24 °F

    Chance Snow

  • Thursday Night

    Thursday Night: A 30 percent chance of snow before 11pm. Mostly cloudy, with a low around -14. North northwest wind 10 to 15 mph, with gusts as high as 23 mph. New snow accumulation of less than a half inch possible.

    Low: -14 °F

    Chance Snow
    then Mostly
    Cloudy

  • Friday

    Friday: A 20 percent chance of snow after 11am. Mostly cloudy and cold, with a high near -2. Northwest wind around 8 mph.

    High: -2 °F

    Slight Chance
    Snow

  • Friday Night

    Friday Night: A 50 percent chance of snow. Cloudy, with a low around -11. East wind around 6 mph.

    Low: -11 °F

    Chance Snow

Detailed Forecast

Tonight
Rain likely, mainly between 1am and 5am. Mostly cloudy, with a temperature falling to near 29 by 9pm, then rising to around 37 during the remainder of the night. Breezy, with a southwest wind 10 to 15 mph increasing to 21 to 26 mph after midnight. Winds could gust as high as 40 mph. Chance of precipitation is 70%.
Tuesday
A 40 percent chance of rain, mainly before 9am. Cloudy through mid morning, then gradual clearing, with a temperature rising to near 41 by 10am, then falling to around 32 during the remainder of the day. Windy, with a west northwest wind 31 to 37 mph, with gusts as high as 55 mph.
Tuesday Night
Mostly clear, with a low around 7. Wind chill values between zero and 5. Blustery, with a west northwest wind 17 to 22 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 31 mph.
Wednesday
Snow likely after 11am. Mostly cloudy, with a high near 29. Light and variable wind becoming east southeast 5 to 10 mph in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 2 inches possible.
Wednesday Night
Snow likely before 11pm, then a chance of freezing rain between 11pm and 2am, then a chance of snow after 2am. Cloudy, with a low around 15. East southeast wind around 10 mph becoming west northwest after midnight. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Thursday
A 50 percent chance of snow. Mostly cloudy, with a high near 24. North northwest wind 11 to 18 mph, with gusts as high as 25 mph. New snow accumulation of 1 to 3 inches possible.
Thursday Night
A 30 percent chance of snow before 11pm. Mostly cloudy, with a low around -14. North northwest wind 10 to 15 mph, with gusts as high as 23 mph. New snow accumulation of less than a half inch possible.
Friday
A 20 percent chance of snow after 11am. Mostly cloudy and cold, with a high near -2. Northwest wind around 8 mph.
Friday Night
A 50 percent chance of snow. Cloudy, with a low around -11. East wind around 6 mph.
Saturday
A 40 percent chance of snow. Mostly cloudy, with a high near 5. East wind 6 to 9 mph.
Saturday Night
Mostly cloudy, with a low around -9. Southeast wind around 7 mph.
Sunday
Mostly cloudy, with a high near 26.
Sunday Night
Partly cloudy, with a low around -1.
Monday
Partly sunny, with a high near 19.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lambert MT
 47.69°N 104.62°W (Elev. 2451 ft)
Last Update:
4:31 pm MST Dec 8, 2025
Forecast Valid:
7pm MST Dec 8, 2025-6pm MST Dec 15, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation