Tracking Atmospheric River in the Northwest U.S. and Clipper with Winter Weather in the Northeast U.S.

A prolonged atmospheric river will continue to bring gusty winds, heavy rainfall which may lead to urban and river flooding with possible landslides, and heavy inter-mountain snow over the Pacific Northwest into the northern Rockies through Thursday. A clipper will cross the Great Lakes and Northeast U.S. into Thursday with areas of moderate to heavy snow and mixed wintry precipitation. Read More >

Hazardous Weather Conditions

Current conditions at

Custer, Custer County Airport (KCUT)

Lat: 43.73°NLon: 103.62°WElev: 5600ft.

Mostly Cloudy

42°F

6°C

Humidity 68%
Wind Speed Vrbl 7 mph
Barometer 29.76 in (1008.1 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 11 Dec 12:53 am MST
Extended Forecast for

4 Miles NNE Keystone SD

  • Overnight

    Overnight: A 30 percent chance of rain before 2am.  Partly cloudy, with a steady temperature around 45. West wind 8 to 10 mph, with gusts as high as 24 mph.

    Low: 45 °F

    Chance Rain

  • Thursday

    Thursday: A 20 percent chance of rain after 11am.  Mostly sunny, with a high near 54. Northwest wind 10 to 16 mph, with gusts as high as 38 mph.

    High: 54 °F

    Slight Chance
    Rain

  • Thursday Night

    Thursday Night: Rain likely before 8pm, then rain likely, possibly mixed with snow between 8pm and 10pm, then snow likely after 10pm.  Mostly cloudy, with a low around 22. Northwest wind 5 to 11 mph, with gusts as high as 31 mph.  Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 22 °F

    Rain/Snow
    Likely then
    Chance Snow

  • Friday

    Friday: Snow likely.  Cloudy, with a temperature rising to near 25 by noon, then falling to around 19 during the remainder of the day. Wind chill values as low as 14. Northeast wind 3 to 6 mph. Winds could gust as high as 15 mph.  Chance of precipitation is 70%. New snow accumulation of 1 to 2 inches possible.

    High: 25 °F

    Snow Likely

  • Friday Night

    Friday Night: A 50 percent chance of snow.  Mostly cloudy, with a steady temperature around 19. Southeast wind 3 to 5 mph.  New snow accumulation of less than a half inch possible.

    Low: 19 °F

    Chance Snow

  • Saturday

    Saturday: A 30 percent chance of snow, mainly before 11am.  Partly sunny, with a high near 25. North wind around 6 mph becoming calm  in the afternoon. Winds could gust as high as 16 mph.

    High: 25 °F

    Chance Snow

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 14. South wind 3 to 7 mph. Winds could gust as high as 18 mph.

    Low: 14 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 54. Southwest wind 6 to 8 mph, with gusts as high as 21 mph.

    High: 54 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 33.

    Low: 33 °F

    Mostly Clear

Detailed Forecast

Overnight
A 30 percent chance of rain before 2am. Partly cloudy, with a steady temperature around 45. West wind 8 to 10 mph, with gusts as high as 24 mph.
Thursday
A 20 percent chance of rain after 11am. Mostly sunny, with a high near 54. Northwest wind 10 to 16 mph, with gusts as high as 38 mph.
Thursday Night
Rain likely before 8pm, then rain likely, possibly mixed with snow between 8pm and 10pm, then snow likely after 10pm. Mostly cloudy, with a low around 22. Northwest wind 5 to 11 mph, with gusts as high as 31 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Friday
Snow likely. Cloudy, with a temperature rising to near 25 by noon, then falling to around 19 during the remainder of the day. Wind chill values as low as 14. Northeast wind 3 to 6 mph. Winds could gust as high as 15 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 2 inches possible.
Friday Night
A 50 percent chance of snow. Mostly cloudy, with a steady temperature around 19. Southeast wind 3 to 5 mph. New snow accumulation of less than a half inch possible.
Saturday
A 30 percent chance of snow, mainly before 11am. Partly sunny, with a high near 25. North wind around 6 mph becoming calm in the afternoon. Winds could gust as high as 16 mph.
Saturday Night
Partly cloudy, with a low around 14. South wind 3 to 7 mph. Winds could gust as high as 18 mph.
Sunday
Sunny, with a high near 54. Southwest wind 6 to 8 mph, with gusts as high as 21 mph.
Sunday Night
Mostly clear, with a low around 33.
Monday
Sunny, with a high near 57.
Monday Night
Partly cloudy, with a low around 36.
Tuesday
Mostly sunny, with a high near 55.
Tuesday Night
Partly cloudy, with a low around 33.
Wednesday
Mostly sunny, with a high near 49.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNE Keystone SD
 43.94°N 103.41°W (Elev. 4774 ft)
12:51 am MST Dec 11, 2025
1am MST Dec 11, 2025-6pm MST Dec 17, 2025
 
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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