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

Significant and Catastrophic Flooding in the Pacific Northwest; Very Cold Temperatures in the Northern Plains

The atmospheric river over the Pacific Northwest will begin to subside today, but lingering rainfall will exacerbate ongoing catastrophic major river flooding, and landslides will continue across portions of western Washington and northwest Oregon for several days. Arctic air will plummet southward into the Northern Plains today, bringing cold air in the single digits to the region by Friday. Read More >

Hazardous Weather Conditions

Current conditions at

Spearfish / Clyde Ice (KSPF)

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

Mostly Cloudy

37°F

3°C

Humidity 100%
Wind Speed Calm
Barometer 29.68 in
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 11 Dec 5:55 am MST
Extended Forecast for

Lead SD

  • Today

    Today: Rain likely before 5pm, then rain likely, possibly mixed with snow. Mostly cloudy, with a temperature rising to near 47 by noon, then falling to around 37 during the remainder of the day. West wind 13 to 17 mph, with gusts as high as 33 mph. Chance of precipitation is 70%. Total daytime snow accumulation of less than a half inch possible.

    High: 47 °F⇓

    Chance Rain
    then
    Rain/Snow
    Likely

  • Tonight

    Tonight: Snow likely, possibly mixed with rain, becoming all snow after 7pm. Mostly cloudy, with a low around 18. Wind chill values as low as 10. Northwest wind 7 to 15 mph, with gusts as high as 33 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.

    Low: 18 °F

    Rain/Snow
    Likely then
    Chance Snow

  • Friday

    Friday: Snow. High near 22. Wind chill values as low as 9. Northwest wind 5 to 7 mph. Chance of precipitation is 90%. New snow accumulation of 1 to 3 inches possible.

    High: 22 °F

    Snow

  • Friday Night

    Friday Night: Snow. Steady temperature around 18. Wind chill values as low as 10. Light east wind. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.

    Low: 18 °F

    Snow

  • Saturday

    Saturday: Snow likely, mainly before 11am. Cloudy, then gradually becoming mostly sunny, with a high near 22. North wind around 5 mph becoming calm in the afternoon. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.

    High: 22 °F

    Snow Likely
    then Slight
    Chance Snow

  • Saturday Night

    Saturday Night: Partly cloudy, with a temperature rising to around 28 by 5am. Calm wind becoming southwest around 5 mph after midnight. Winds could gust as high as 16 mph.

    Low: 12 °F⇑

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 51. Southwest wind around 7 mph, with gusts as high as 18 mph.

    High: 51 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 34. Southwest wind around 7 mph, with gusts as high as 20 mph.

    Low: 34 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

Detailed Forecast

Today
Rain likely before 5pm, then rain likely, possibly mixed with snow. Mostly cloudy, with a temperature rising to near 47 by noon, then falling to around 37 during the remainder of the day. West wind 13 to 17 mph, with gusts as high as 33 mph. Chance of precipitation is 70%. Total daytime snow accumulation of less than a half inch possible.
Tonight
Snow likely, possibly mixed with rain, becoming all snow after 7pm. Mostly cloudy, with a low around 18. Wind chill values as low as 10. Northwest wind 7 to 15 mph, with gusts as high as 33 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
Friday
Snow. High near 22. Wind chill values as low as 9. Northwest wind 5 to 7 mph. Chance of precipitation is 90%. New snow accumulation of 1 to 3 inches possible.
Friday Night
Snow. Steady temperature around 18. Wind chill values as low as 10. Light east wind. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.
Saturday
Snow likely, mainly before 11am. Cloudy, then gradually becoming mostly sunny, with a high near 22. North wind around 5 mph becoming calm in the afternoon. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.
Saturday Night
Partly cloudy, with a temperature rising to around 28 by 5am. Calm wind becoming southwest around 5 mph after midnight. Winds could gust as high as 16 mph.
Sunday
Sunny, with a high near 51. Southwest wind around 7 mph, with gusts as high as 18 mph.
Sunday Night
Mostly clear, with a low around 34. Southwest wind around 7 mph, with gusts as high as 20 mph.
Monday
Mostly sunny, with a high near 50.
Monday Night
Partly cloudy, with a low around 37.
Tuesday
A slight chance of rain. Partly sunny, with a high near 50.
Tuesday Night
A chance of rain and snow. Mostly cloudy, with a low around 32.
Wednesday
A chance of snow. Partly sunny, with a high near 44.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lead SD
 44.35°N 103.77°W (Elev. 5322 ft)
Last Update:
5:11 am MST Dec 11, 2025
Forecast Valid:
6am MST Dec 11, 2025-6pm MST Dec 17, 2025
 
Forecast Discussion
 
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Additional Resources

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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