National Weather Service United States Department of Commerce

Flash flooding possible for parts of Upper Midwest

A slow-moving weather system progressing from the northern Plains to the Great Lakes will bring excessive rainfall and a risk of flash flooding to portions of the Upper Midwest on Friday. The heaviest rainfall is expected from central Iowa northeastward across southeastern Minn. and into Wisc. Rainfall totals of 1-2 inches, with locally-higher amounts, are possible through Saturday morning.
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Hazardous Weather Conditions

Current Conditions

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Mammoth Hot Springs WY

7 Day Forecast

For More Weather Information:

Riverton, WY Local Forecast Office

This
Afternoon

Isolated Thunderstorms Chance for Measurable Precipitation 20%

Isolated
Thunderstorms

High: 74 °F

Tonight

Isolated Thunderstorms Chance for Measurable Precipitation 20%

Isolated
Thunderstorms

Low: 49 °F

Saturday

Scattered Thunderstorms Chance for Measurable Precipitation 50%

Scattered
Thunderstorms

High: 67 °F

Saturday
Night

Scattered Thunderstorms Chance for Measurable Precipitation 40%

Scattered
Thunderstorms

Low: 44 °F

Sunday

Isolated Thunderstorms Chance for Measurable Precipitation 20%

Isolated
Thunderstorms

High: 61 °F

Sunday
Night

Partly Cloudy

Partly
Cloudy

Low: 42 °F

Labor
Day

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

High: 61 °F

Monday
Night

Partly Cloudy

Partly
Cloudy

Low: 40 °F

Tuesday

Sunny

Sunny

High: 68 °F

Detailed Forecast

  • This Afternoon Isolated showers and thunderstorms before 5pm. Mostly sunny, with a high near 74. Southwest wind 6 to 11 mph. Chance of precipitation is 20%.
  • Tonight Isolated showers and thunderstorms after 9pm. Mostly cloudy, with a low around 49. South southwest wind 9 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.
  • Saturday Scattered showers and thunderstorms. Some of the storms could produce small hail and gusty winds. Mostly cloudy, with a high near 67. Light and variable wind becoming southwest 11 to 16 mph in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
  • Saturday Night Scattered showers and thunderstorms, mainly before midnight. Mostly cloudy, with a low around 44. West northwest wind 5 to 10 mph becoming light and variable. Chance of precipitation is 40%.
  • Sunday Isolated showers and thunderstorms before noon. Mostly sunny, with a high near 61. West northwest wind 5 to 10 mph becoming west southwest 11 to 16 mph in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 20%.
  • Sunday Night Partly cloudy, with a low around 42. West southwest wind 5 to 10 mph.
  • Labor Day A 20 percent chance of showers and thunderstorms after noon. Some of the storms could produce gusty winds. Mostly sunny, with a high near 61. South southwest wind 6 to 9 mph.
  • Monday Night Partly cloudy, with a low around 40.
  • Tuesday Sunny, with a high near 68.
  • Tuesday Night Mostly clear, with a low around 42.
  • Wednesday A slight chance of showers and thunderstorms. Some of the storms could produce gusty winds. Sunny, with a high near 69.
  • Wednesday Night A slight chance of showers and thunderstorms. Some of the storms could produce gusty winds. Partly cloudy, with a low around 43.
  • Thursday A slight chance of showers and thunderstorms. Some of the storms could produce gusty winds. Mostly sunny, with a high near 67.