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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4 Miles N Hamilton Dome WY

7 Day Forecast

For More Weather Information:

Riverton, WY Local Forecast Office

Overnight

Showers Likely Chance for Measurable Precipitation 70%

Showers
Likely

Low: 53 °F

Saturday

Scattered Showers Chance for Measurable Precipitation 50%

Scattered
Showers

High: 60 °F

Saturday
Night

Scattered Showers Chance for Measurable Precipitation 50%

Scattered
Showers

Low: 45 °F

Sunday

Isolated Showers Chance for Measurable Precipitation 20%

Isolated
Showers

High: 59 °F

Sunday
Night

Breezy

Breezy

Low: 48 °F

Monday

Isolated Thunderstorms Chance for Measurable Precipitation 20%

Isolated
Thunderstorms

High: 65 °F

Monday
Night

Scattered Showers Chance for Measurable Precipitation 30%

Scattered
Showers

Low: 47 °F

Tuesday

Chance Thunderstorms Chance for Measurable Precipitation 30%

Chance
Thunderstorms

High: 64 °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 53. South southwest wind around 6 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
  • Saturday Scattered showers, with thunderstorms also possible after noon. Partly sunny, with a high near 60. Northwest wind 9 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.
  • Saturday Night Scattered showers and thunderstorms. Mostly cloudy, with a low around 45. Breezy, with a west wind 7 to 12 mph increasing to 15 to 20 mph after midnight. Winds could gust as high as 28 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
  • Sunday Isolated showers. Partly sunny, with a high near 59. Breezy, with a west southwest wind 16 to 21 mph, with gusts as high as 29 mph. Chance of precipitation is 20%.
  • Sunday Night Mostly cloudy, with a low around 48. Breezy, with a south southwest wind 10 to 20 mph, with gusts as high as 28 mph.
  • Monday Isolated showers and thunderstorms after noon. Partly sunny, with a high near 65. Breezy, with a south southwest wind 13 to 21 mph, with gusts as high as 29 mph. Chance of precipitation is 20%.
  • Monday Night Scattered showers and thunderstorms before midnight, then isolated showers. Mostly cloudy, with a low around 47. Breezy, with a south southeast wind 15 to 22 mph, with gusts as high as 31 mph. Chance of precipitation is 30%.
  • Tuesday A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 64.
  • Tuesday Night A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 50.
  • Wednesday Sunny, with a high near 71.
  • Wednesday Night Mostly clear, with a low around 53.
  • Thursday Sunny, with a high near 80.
  • Thursday Night Mostly clear, with a low around 55.
  • Friday Mostly sunny, with a high near 81.