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Severe Thunderstorms and Flooding from the Southern Plains to the Great Lakes; Record Heat in the East

Widely scattered severe thunderstorms may produce damaging winds, hail, and flash flooding from the southern Plains into the lower Great Lakes. Elevated to locally critical fire weather conditions will persist across portions of the Southwest and Southern High Plains due to gusty winds and dry conditions. An early-season heatwave will challenge temperature records across the eastern U.S.. Read More >

Hazardous Weather Conditions

Current conditions at

Rosebud Sioux Tribal Airport (KSUO)

Lat: 43.26°NLon: 100.86°WElev: 2724ft.

Overcast

39°F

4°C

Humidity 93%
Wind Speed NW 7 mph
Barometer 30.16 in
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill34°F (1°C)
Last update 19 May 7:15 am CDT
Extended Forecast for

Long Valley SD

Freeze Warning until May 19, 09:00am
Click here for hazard details and duration
...
  •  
    Freeze Warning until May 19, 09:00am

    NOW until 9:00am Tue

    Freeze Warning

  • Today

    High: 57 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 37. Breezy, with a northeast wind 5 to 10 mph becoming south 15 to 20 mph in the evening. Winds could gust as high as 30 mph.

    Low: 37 °F

    Mostly Clear
    then Mostly
    Clear and
    Breezy

  • Wednesday

    Wednesday: A 20 percent chance of showers. Increasing clouds, with a high near 62. Windy, with a south wind 22 to 27 mph increasing to 28 to 33 mph in the afternoon. Winds could gust as high as 44 mph.

    High: 62 °F

    Slight Chance
    Showers and
    Windy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 43. Windy, with a south wind 24 to 30 mph, with gusts as high as 40 mph.

    Low: 43 °F

    Partly Cloudy
    and Windy

  • Thursday

    Thursday: A 30 percent chance of showers after noon. Mostly sunny, with a high near 70. Breezy, with a south wind around 24 mph, with gusts as high as 32 mph.

    High: 70 °F

    Breezy.
    Mostly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 44. Breezy, with a south wind 15 to 23 mph, with gusts as high as 31 mph. Chance of precipitation is 60%.

    Low: 44 °F

    Showers
    Likely and
    Breezy

  • Friday

    Friday: A 50 percent chance of showers. Partly sunny, with a high near 64.

    High: 64 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A slight chance of showers before midnight. Mostly cloudy, with a low around 44.

    Low: 44 °F

    Slight Chance
    Showers then
    Partly Cloudy

Detailed Forecast

Today
Partly sunny, then gradually becoming sunny, with a high near 57. Northwest wind 8 to 18 mph, with gusts as high as 25 mph.
Tonight
Mostly clear, with a low around 37. Breezy, with a northeast wind 5 to 10 mph becoming south 15 to 20 mph in the evening. Winds could gust as high as 30 mph.
Wednesday
A 20 percent chance of showers. Increasing clouds, with a high near 62. Windy, with a south wind 22 to 27 mph increasing to 28 to 33 mph in the afternoon. Winds could gust as high as 44 mph.
Wednesday Night
Partly cloudy, with a low around 43. Windy, with a south wind 24 to 30 mph, with gusts as high as 40 mph.
Thursday
A 30 percent chance of showers after noon. Mostly sunny, with a high near 70. Breezy, with a south wind around 24 mph, with gusts as high as 32 mph.
Thursday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 44. Breezy, with a south wind 15 to 23 mph, with gusts as high as 31 mph. Chance of precipitation is 60%.
Friday
A 50 percent chance of showers. Partly sunny, with a high near 64.
Friday Night
A slight chance of showers before midnight. Mostly cloudy, with a low around 44.
Saturday
Mostly sunny, with a high near 76.
Saturday Night
Mostly clear, with a low around 51. Breezy.
Sunday
Sunny, with a high near 86. Breezy.
Sunday Night
Mostly clear, with a low around 55.
Memorial Day
Sunny, with a high near 90. Breezy.
Basemap Options
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Long Valley SD
 43.45°N 101.49°W (Elev. 2700 ft)
Last Update:
3:22 am MDT May 19, 2026
Forecast Valid:
6am MDT May 19, 2026-6pm MDT May 25, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation