National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Severe Thunderstorms in Portions of the Mississippi Valley and Great Lakes

A few severe thunderstorms with large hail, are expected across parts of the middle and upper Mississippi River Valley tonight through early morning. Snow and a wintry mix overnight in the Upper Midwest into the Great Lakes can cause hazardous travel conditions. Fire weather concerns continue for a large portion of the central and southern High Plains and Four Corners region this evening. Read More >

Hazardous Weather Conditions

Current conditions at

MAMMOTH AT YELLOWSTONE NATIONAL PARK (YLAW4)

Lat: 44.977222°NLon: 110.695278°WElev: 6138.0ft.

NA

31°F

-1°C

Humidity 98%
Wind Speed N 2 MPH
Barometer NA
Dewpoint 30°F (-1°C)
Visibility NA
Last update 31 Mar 02:15 AM MDT
Extended Forecast for

Mammoth WY

  • Overnight

    Overnight: Snow showers likely, mainly after 5am. Mostly cloudy, with a low around 31. Light north wind. Chance of precipitation is 70%. Total nighttime snow accumulation of less than a half inch possible.

    Low: 31 °F

    Snow Showers
    Likely

  • Tuesday

    Tuesday: Rain, possibly mixed with snow showers, becoming all rain after 5pm. Some thunder is also possible. Snow level rising to 7800 feet in the afternoon. High near 50. Light and variable wind becoming south southwest 5 to 10 mph in the morning. Winds could gust as high as 25 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    High: 50 °F

    Rain/Snow

  • Tuesday Night

    Tuesday Night: Rain and snow showers before 1am, then a chance of rain showers between 1am and 2am, then a chance of rain and snow showers after 2am. Some thunder is also possible. Snow level 7700 feet lowering to 6200 feet after midnight . Low around 37. South southwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    Low: 37 °F

    Rain/Snow
    then Chance
    Rain/Snow

  • Wednesday

    Wednesday: A chance of rain and snow showers before 9am, then rain showers. Some thunder is also possible. Snow level 6200 feet rising to 7400 feet in the afternoon. High near 52. Calm wind becoming southwest 5 to 8 mph in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    High: 52 °F

    Chance
    Rain/Snow
    then Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm. Low around 39. South wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 39 °F

    Showers

  • Thursday

    Thursday: Rain and snow showers, becoming all snow after noon. Some thunder is also possible. High near 45. Breezy, with a south southwest wind 10 to 15 mph, with gusts as high as 31 mph. Chance of precipitation is 100%.

    High: 45 °F

    Rain/Snow
    then Snow
    Showers and
    Breezy

  • Thursday Night

    Thursday Night: Snow showers. Low around 29. Southwest wind 7 to 14 mph becoming west northwest after midnight. Winds could gust as high as 29 mph. Chance of precipitation is 90%.

    Low: 29 °F

    Snow Showers

  • Friday

    Friday: Snow showers likely, mainly before noon. Mostly cloudy, with a high near 42. Chance of precipitation is 70%.

    High: 42 °F

    Snow Showers
    Likely

  • Friday Night

    Friday Night: A 20 percent chance of snow showers before midnight. Mostly cloudy, with a low around 26.

    Low: 26 °F

    Slight Chance
    Snow Showers
    then Partly
    Cloudy

Detailed Forecast

Overnight
Snow showers likely, mainly after 5am. Mostly cloudy, with a low around 31. Light north wind. Chance of precipitation is 70%. Total nighttime snow accumulation of less than a half inch possible.
Tuesday
Rain, possibly mixed with snow showers, becoming all rain after 5pm. Some thunder is also possible. Snow level rising to 7800 feet in the afternoon. High near 50. Light and variable wind becoming south southwest 5 to 10 mph in the morning. Winds could gust as high as 25 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Tuesday Night
Rain and snow showers before 1am, then a chance of rain showers between 1am and 2am, then a chance of rain and snow showers after 2am. Some thunder is also possible. Snow level 7700 feet lowering to 6200 feet after midnight . Low around 37. South southwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Wednesday
A chance of rain and snow showers before 9am, then rain showers. Some thunder is also possible. Snow level 6200 feet rising to 7400 feet in the afternoon. High near 52. Calm wind becoming southwest 5 to 8 mph in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Wednesday Night
Showers and possibly a thunderstorm. Low around 39. South wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
Rain and snow showers, becoming all snow after noon. Some thunder is also possible. High near 45. Breezy, with a south southwest wind 10 to 15 mph, with gusts as high as 31 mph. Chance of precipitation is 100%.
Thursday Night
Snow showers. Low around 29. Southwest wind 7 to 14 mph becoming west northwest after midnight. Winds could gust as high as 29 mph. Chance of precipitation is 90%.
Friday
Snow showers likely, mainly before noon. Mostly cloudy, with a high near 42. Chance of precipitation is 70%.
Friday Night
A 20 percent chance of snow showers before midnight. Mostly cloudy, with a low around 26.
Saturday
Sunny, with a high near 51.
Saturday Night
Mostly clear, with a low around 30.
Sunday
Sunny, with a high near 56.
Sunday Night
Partly cloudy, with a low around 33.
Monday
Mostly sunny, with a high near 60.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mammoth WY
 44.98°N 110.69°W (Elev. 5745 ft)
Last Update:
2:03 am MDT Mar 31, 2026
Forecast Valid:
3am MDT Mar 31, 2026-6pm MDT Apr 6, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation