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

Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Hazardous Weather Conditions

Current conditions at

Watertown, Watertown Municipal Airport (KATY)

Lat: 44.9°NLon: 97.15°WElev: 1745ft.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Henry SD

Dense Fog Advisory until December 25, 10:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory until December 25, 10:00am

    NOW until 10:00am Thu

    Dense Fog Advisory

  • Tonight

    Low: 24 °F

    Areas
    Freezing Fog

  • Christmas Day

    Christmas Day: Patchy fog before 3pm, then patchy fog after 4pm. Otherwise, mostly cloudy, with a high near 40. South wind 14 to 18 mph, with gusts as high as 29 mph.

    High: 40 °F

    Patchy Fog

  • Thursday Night

    Thursday Night: Patchy fog before 3am. Areas of freezing fog between 3am and 5am. Otherwise, mostly cloudy, with a low around 28. South wind 7 to 14 mph becoming northwest after midnight. Winds could gust as high as 23 mph.

    Low: 28 °F

    Areas
    Freezing Fog
    and Patchy
    Fog

  • Friday

    Friday: Partly sunny, with a high near 39. North northwest wind around 7 mph becoming south in the afternoon.

    High: 39 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 31. South wind 7 to 10 mph.

    Low: 31 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 47. South wind 10 to 13 mph becoming north northwest in the afternoon.

    High: 47 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A slight chance of snow after midnight. Mostly cloudy, with a low around 9. Blustery, with a north northwest wind 13 to 23 mph, with gusts as high as 36 mph. Chance of precipitation is 20%.

    Low: 9 °F

    Partly Cloudy
    then Slight
    Chance Snow
    and Blustery

  • Sunday

    Sunday: Partly sunny, with a high near 14. Blustery, with a northwest wind 23 to 29 mph, with gusts as high as 43 mph.

    High: 14 °F

    Partly Sunny
    and Blustery

Detailed Forecast

Tonight
Areas of freezing fog. Mostly cloudy, with a low around 24. East wind 10 to 15 mph, with gusts as high as 23 mph.
Christmas Day
Patchy fog before 3pm, then patchy fog after 4pm. Otherwise, mostly cloudy, with a high near 40. South wind 14 to 18 mph, with gusts as high as 29 mph.
Thursday Night
Patchy fog before 3am. Areas of freezing fog between 3am and 5am. Otherwise, mostly cloudy, with a low around 28. South wind 7 to 14 mph becoming northwest after midnight. Winds could gust as high as 23 mph.
Friday
Partly sunny, with a high near 39. North northwest wind around 7 mph becoming south in the afternoon.
Friday Night
Partly cloudy, with a low around 31. South wind 7 to 10 mph.
Saturday
Mostly sunny, with a high near 47. South wind 10 to 13 mph becoming north northwest in the afternoon.
Saturday Night
A slight chance of snow after midnight. Mostly cloudy, with a low around 9. Blustery, with a north northwest wind 13 to 23 mph, with gusts as high as 36 mph. Chance of precipitation is 20%.
Sunday
Partly sunny, with a high near 14. Blustery, with a northwest wind 23 to 29 mph, with gusts as high as 43 mph.
Sunday Night
Partly cloudy, with a low around 0. Blustery, with a northwest wind 14 to 24 mph, with gusts as high as 36 mph.
Monday
Mostly sunny, with a high near 16.
Monday Night
Mostly cloudy, with a low around 7.
Tuesday
Mostly cloudy, with a high near 33.
Tuesday Night
A slight chance of snow. Mostly cloudy, with a low around 9. Chance of precipitation is 20%.
Wednesday
Partly sunny, with a high near 21.
Basemap Options
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Henry SD
 44.88°N 97.48°W (Elev. 1818 ft)
Last Update:
8:36 pm CST Dec 24, 2025
Forecast Valid:
8pm CST Dec 24, 2025-6pm CST Dec 31, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation