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 >

Current conditions at

Spearfish / Clyde Ice (KSPF)

Lat: 44.48°NLon: 103.78°WElev: 3898ft.

Fair

39°F

4°C

Humidity 48%
Wind Speed W 10 mph
Barometer 30.03 in
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 7 Dec 3:55 pm MST
Extended Forecast for

Lead SD

  • Tonight

    Tonight: Increasing clouds, with a low around 27. West wind 6 to 8 mph, with gusts as high as 23 mph.

    Low: 27 °F

    Increasing
    Clouds

  • Monday

    Monday: Mostly sunny, with a high near 39. West wind 10 to 13 mph, with gusts as high as 31 mph.

    High: 39 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A slight chance of snow before 1am, then a slight chance of rain and snow between 1am and 3am, then a slight chance of rain after 3am. Mostly cloudy, with a temperature falling to near 33 by 9pm, then rising to around 39 during the remainder of the night. West wind 10 to 17 mph, with gusts as high as 33 mph. Chance of precipitation is 20%.

    Low: 33 °F⇑

    Slight Chance
    Snow then
    Slight Chance
    Rain/Snow

  • Tuesday

    Tuesday: Rain likely before 3pm, then snow likely. Partly sunny, with a temperature rising to near 44 by 11am, then falling to around 34 during the remainder of the day. Breezy, with a west wind 18 to 20 mph, with gusts as high as 37 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 44 °F⇓

    Rain Likely
    then
    Rain/Snow
    Likely and
    Breezy

  • Tuesday Night

    Tuesday Night: A 40 percent chance of snow, mainly after 11pm. Mostly cloudy, with a low around 26. Northwest wind 9 to 18 mph, with gusts as high as 38 mph. New snow accumulation of less than a half inch possible.

    Low: 26 °F

    Chance Snow

  • Wednesday

    Wednesday: Snow before 5pm, then rain and snow. High near 37. Southwest wind around 9 mph, with gusts as high as 17 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.

    High: 37 °F

    Snow then
    Rain/Snow

  • Wednesday Night

    Wednesday Night: Rain and snow, becoming all snow after 9pm. Low around 21. West wind 9 to 13 mph, with gusts as high as 31 mph. Chance of precipitation is 80%.

    Low: 21 °F

    Rain/Snow
    then Snow
    Likely

  • Thursday

    Thursday: Snow likely, mainly before 11am. Mostly cloudy, with a high near 27. Northwest wind 6 to 10 mph, with gusts as high as 26 mph.

    High: 27 °F

    Snow Likely

  • Thursday Night

    Thursday Night: Snow likely. Mostly cloudy, with a low around 5.

    Low: 5 °F

    Snow Likely

Detailed Forecast

Tonight
Increasing clouds, with a low around 27. West wind 6 to 8 mph, with gusts as high as 23 mph.
Monday
Mostly sunny, with a high near 39. West wind 10 to 13 mph, with gusts as high as 31 mph.
Monday Night
A slight chance of snow before 1am, then a slight chance of rain and snow between 1am and 3am, then a slight chance of rain after 3am. Mostly cloudy, with a temperature falling to near 33 by 9pm, then rising to around 39 during the remainder of the night. West wind 10 to 17 mph, with gusts as high as 33 mph. Chance of precipitation is 20%.
Tuesday
Rain likely before 3pm, then snow likely. Partly sunny, with a temperature rising to near 44 by 11am, then falling to around 34 during the remainder of the day. Breezy, with a west wind 18 to 20 mph, with gusts as high as 37 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Tuesday Night
A 40 percent chance of snow, mainly after 11pm. Mostly cloudy, with a low around 26. Northwest wind 9 to 18 mph, with gusts as high as 38 mph. New snow accumulation of less than a half inch possible.
Wednesday
Snow before 5pm, then rain and snow. High near 37. Southwest wind around 9 mph, with gusts as high as 17 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.
Wednesday Night
Rain and snow, becoming all snow after 9pm. Low around 21. West wind 9 to 13 mph, with gusts as high as 31 mph. Chance of precipitation is 80%.
Thursday
Snow likely, mainly before 11am. Mostly cloudy, with a high near 27. Northwest wind 6 to 10 mph, with gusts as high as 26 mph.
Thursday Night
Snow likely. Mostly cloudy, with a low around 5.
Friday
A chance of snow. Mostly cloudy, with a high near 15.
Friday Night
A chance of snow. Mostly cloudy, with a low around 7.
Saturday
A slight chance of snow. Partly sunny, with a high near 31.
Saturday Night
Partly cloudy, with a low around 17.
Sunday
Mostly sunny, with a high near 41.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lead SD
 44.35°N 103.77°W (Elev. 5322 ft)
Last Update:
3:12 pm MST Dec 7, 2025
Forecast Valid:
4pm MST Dec 7, 2025-6pm MST Dec 14, 2025
 
Forecast Discussion
 
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Additional Resources

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