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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Greybull/S Big Horn Airport WY

7 Day Forecast

For More Weather Information:

Riverton, WY Local Forecast Office

Overnight

Showers Likely Chance for Measurable Precipitation 60%

Showers
Likely

Low: 57 °F

Saturday

Scattered Showers Chance for Measurable Precipitation 50%

Scattered
Showers

High: 64 °F

Saturday
Night

Scattered Showers Chance for Measurable Precipitation 30%

Scattered
Showers

Low: 47 °F

Sunday

Isolated Showers Chance for Measurable Precipitation 20%

Isolated
Showers

High: 63 °F

Sunday
Night

Breezy

Breezy

Low: 45 °F

Monday

Isolated Thunderstorms Chance for Measurable Precipitation 20%

Isolated
Thunderstorms

High: 70 °F

Monday
Night

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

Low: 51 °F

Tuesday

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

High: 68 °F

Tuesday
Night

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

Low: 50 °F

Detailed Forecast

  • Overnight Showers likely. Cloudy, with a low around 57. Southeast wind around 6 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
  • Saturday Scattered showers, with thunderstorms also possible after noon. Some of the storms could produce small hail and gusty winds. Partly sunny, with a high near 64. Light and variable wind becoming west northwest 13 to 18 mph in the morning. Winds could gust as high as 25 mph. Chance of precipitation is 50%.
  • Saturday Night Scattered showers and thunderstorms. Mostly cloudy, with a low around 47. Windy, with a west northwest wind 21 to 26 mph increasing to 27 to 32 mph in the evening. Winds could gust as high as 45 mph. Chance of precipitation is 30%.
  • Sunday Isolated showers before noon. Partly sunny, with a high near 63. Breezy, with a west northwest wind around 23 mph, with gusts as high as 32 mph. Chance of precipitation is 20%.
  • Sunday Night Mostly cloudy, with a low around 45. Breezy, with a west northwest wind 17 to 22 mph becoming southwest 10 to 15 mph after midnight. Winds could gust as high as 31 mph.
  • Monday Isolated showers and thunderstorms after noon. Partly sunny, with a high near 70. South wind 10 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
  • Monday Night A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 51. Breezy, with a south southwest wind 16 to 21 mph, with gusts as high as 29 mph. Chance of precipitation is 20%.
  • Tuesday A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 68.
  • Tuesday Night A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 50.
  • Wednesday Sunny, with a high near 76.
  • Wednesday Night Mostly clear, with a low around 54.
  • Thursday Sunny, with a high near 86.
  • Thursday Night Mostly clear, with a low around 56.
  • Friday Sunny, with a high near 88.