National Weather Service United States Department of Commerce

Heavy rain possible for parts of the northern Rockies & Plains; Severe storms for the Upper Midwest

An unseasonably strong storm system in the northwest U.S. will bring showers and thunderstorms, some heavy, to parts of the northern Rockies and northern Plains through Saturday. Isolated flash floods will be possible in these areas. Some of the storms could be severe in parts of the Dakotas into Minnesota, with large hail and damaging winds.
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Hazardous Weather Conditions

Current Conditions

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Old Faithful WY

7 Day Forecast

For More Weather Information:

Riverton, WY Local Forecast Office

Tonight

Rain/Snow Likely Chance for Measurable Precipitation 70%

Rain/Snow
Likely

Low: 38 °F

Saturday

Chance Rain/Snow Chance for Measurable Precipitation 50%

Chance
Rain/Snow

High: 57 °F

Saturday
Night

Scattered Showers Chance for Measurable Precipitation 50%

Scattered
Showers

Low: 33 °F

Sunday

Scattered Showers Chance for Measurable Precipitation 40%

Scattered
Showers

High: 57 °F

Sunday
Night

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

Low: 33 °F

Monday

Scattered Showers Chance for Measurable Precipitation 40%

Scattered
Showers

High: 61 °F

Monday
Night

Scattered Showers Chance for Measurable Precipitation 40%

Scattered
Showers

Low: 34 °F

Tuesday

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

High: 65 °F

Tuesday
Night

Partly Cloudy

Partly
Cloudy

Low: 34 °F

Detailed Forecast

  • Tonight Rain showers likely before 5am, then scattered rain and snow showers. Some thunder is also possible. Mostly cloudy, with a low around 38. South southwest wind 7 to 9 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.
  • Saturday Scattered rain and snow showers before 9am, then scattered rain showers. Some thunder is also possible. Partly sunny, with a high near 57. South southwest wind 7 to 14 mph becoming west in the afternoon. Chance of precipitation is 50%. Little or no snow accumulation expected.
  • Saturday Night Scattered showers and thunderstorms. Mostly cloudy, with a low around 33. Northwest wind 6 to 10 mph becoming southwest in the evening. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
  • Sunday Scattered showers and thunderstorms. Mostly cloudy, with a high near 57. Southwest wind 5 to 9 mph becoming east southeast in the morning. Chance of precipitation is 40%.
  • Sunday Night A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 33. Southwest wind around 6 mph becoming calm.
  • Monday Scattered showers and thunderstorms, mainly after noon. Partly sunny, with a high near 61. South southeast wind 5 to 7 mph. Chance of precipitation is 40%.
  • Monday Night Scattered showers and thunderstorms, mainly before midnight. Mostly cloudy, with a low around 34. West southwest wind around 5 mph becoming light and variable after midnight. Chance of precipitation is 40%.
  • Tuesday A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 65.
  • Tuesday Night Partly cloudy, with a low around 34.
  • Wednesday Sunny, with a high near 70.
  • Wednesday Night Mostly clear, with a low around 37.
  • Thursday Mostly sunny, with a high near 72.
  • Thursday Night Partly cloudy, with a low around 39.
  • Friday A slight chance of showers and thunderstorms. Mostly sunny, with a high near 70.