Heavy Great Lakes Snow through Friday; Extreme Cold and Potential for Major Winter Storm Late Week into this Weekend

Multiple clipper systems will bring cold temperatures and enhance lake-effect snow downwind of the Great Lakes. An arctic blast will bring frigid temperatures accompanied with gusty winds that may lead to dangerous wind chills beginning in the Northern Plains Thursday before expanding to the South and East. An expansive winter storm will start Friday in the Southern Rockies/Plains and Mid-South. Read More >

Current conditions at

Watertown, Watertown Municipal Airport (KATY)

Lat: 44.9°NLon: 97.15°WElev: 1745ft.

Light Snow and Breezy

15°F

-9°C

Humidity 74%
Wind Speed NW 24 G 39 mph
Barometer 30.02 in (1019.7 mb)
Dewpoint 8°F (-13°C)
Visibility 2.00 mi
Wind Chill-4°F (-20°C)
Last update 21 Jan 4:53 pm CST
Extended Forecast for

Henry SD

Extreme Cold Watch January 22, 06:00pm until January 23, 03:00pm
Winter Weather Advisory January 21, 05:36pm until January 21, 06:00pm
Click here for hazard details and duration
Extreme Cold Watch
Winter Weather Advisory
  •  
    Winter Weather Advisory January 21, 05:36pm until January 21, 06:00pm

    NOW until 6:00pm Wed

    Winter Weather Advisory

  • This Afternoon

    High: 14 °F

    Isolated Snow
    Showers and
    Patchy
    Blowing Snow

  • Tonight

    Tonight: Isolated snow showers.  Patchy blowing snow before 8pm. Increasing clouds, with a low around 2. Blustery, with a west wind 11 to 21 mph, with gusts as high as 32 mph.  Chance of precipitation is 20%.

    Low: 2 °F

    Isolated Snow
    Showers and
    Patchy
    Blowing Snow

  • Thursday

    Thursday: Patchy blowing snow after 11am. Increasing clouds and cold, with a temperature falling to around -6 by 5pm. Wind chill values as low as -30. Blustery, with a northwest wind 13 to 23 mph, with gusts as high as 33 mph.

    High: 7 °F

    Patchy
    Blowing Snow
    and Blustery

  • Thursday Night

    Thursday Night: Mostly clear, with a low around -24. Wind chill values as low as -42. North northwest wind 9 to 16 mph, with gusts as high as 25 mph.

    Low: -24 °F

    Mostly Clear

  • Friday

    Friday: Sunny and cold, with a high near -12. Northwest wind 5 to 8 mph.

    High: -12 °F

    Cold

  • Friday Night

    Friday Night: Mostly cloudy, with a low around -18. Light and variable wind becoming south southeast around 6 mph after midnight.

    Low: -18 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny and cold, with a high near 1. South wind 6 to 9 mph.

    High: 1 °F

    Cold

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around -13. South southeast wind around 7 mph becoming east northeast after midnight.

    Low: -13 °F

    Partly Cloudy

Detailed Forecast

This Afternoon
Isolated snow showers. Patchy blowing snow. Cloudy, with a steady temperature around 14. Blustery, with a west northwest wind around 26 mph, with gusts as high as 38 mph. Chance of precipitation is 20%.
Tonight
Isolated snow showers. Patchy blowing snow before 8pm. Increasing clouds, with a low around 2. Blustery, with a west wind 11 to 21 mph, with gusts as high as 32 mph. Chance of precipitation is 20%.
Thursday
Patchy blowing snow after 11am. Increasing clouds and cold, with a temperature falling to around -6 by 5pm. Wind chill values as low as -30. Blustery, with a northwest wind 13 to 23 mph, with gusts as high as 33 mph.
Thursday Night
Mostly clear, with a low around -24. Wind chill values as low as -42. North northwest wind 9 to 16 mph, with gusts as high as 25 mph.
Friday
Sunny and cold, with a high near -12. Northwest wind 5 to 8 mph.
Friday Night
Mostly cloudy, with a low around -18. Light and variable wind becoming south southeast around 6 mph after midnight.
Saturday
Mostly sunny and cold, with a high near 1. South wind 6 to 9 mph.
Saturday Night
Partly cloudy, with a low around -13. South southeast wind around 7 mph becoming east northeast after midnight.
Sunday
Mostly sunny and cold, with a high near -2. Northeast wind 7 to 9 mph becoming north northwest in the afternoon.
Sunday Night
Partly cloudy, with a low around -17.
Monday
Mostly sunny, with a high near 13.
Monday Night
Partly cloudy, with a low around 1.
Tuesday
Partly sunny, with a high near 17.
Tuesday Night
Mostly cloudy, with a low around -2.
Wednesday
Mostly sunny, with a high near 11.
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ABOUT THIS FORECAST

 
Point Forecast:
Henry SD
 44.88°N 97.48°W (Elev. 1818 ft)
5:11 pm CST Jan 21, 2026
5pm CST Jan 21, 2026-6pm CST Jan 28, 2026
 
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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