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

Tracking Late December Winter Storm Expected to Impact the Northern Plains through the Northeast U.S.

A winter storm system will rapidly intensify over the Midwest on Sunday and track through the Great Lakes on Monday. Periods of heavy snow are anticipated across the Upper Great Lakes late Sunday and continuing into Monday. At least 1/10 inch of ice accumulation is expected from a wintry mix across much of the interior Northeast U.S. starting Sunday afternoon. Read More >

Hazardous Weather Conditions

Current conditions at

MAMMOTH AT YELLOWSTONE NATIONAL PARK (YLAW4)

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

NA

14°F

-10°C

Humidity 85%
Wind Speed SW 2 MPH
Barometer NA
Dewpoint 10°F (-12°C)
Visibility NA
Last update 27 Dec 08:15 PM MST
Extended Forecast for

Mammoth WY

  • Tonight

    Tonight: Partly cloudy, with a low around 4. Wind chill values as low as -5. West northwest wind 5 to 9 mph becoming southwest after midnight.

    Low: 4 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 21. Wind chill values as low as -5. Light south wind.

    High: 21 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 9. Wind chill values as low as zero. South southwest wind around 6 mph.

    Low: 9 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 30. Wind chill values as low as zero. South wind 3 to 6 mph.

    High: 30 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 17. South wind around 6 mph.

    Low: 17 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 37. South wind around 5 mph becoming calm.

    High: 37 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 17. South wind around 6 mph.

    Low: 17 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 40.

    High: 40 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 21.

    Low: 21 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 4. Wind chill values as low as -5. West northwest wind 5 to 9 mph becoming southwest after midnight.
Sunday
Sunny, with a high near 21. Wind chill values as low as -5. Light south wind.
Sunday Night
Mostly clear, with a low around 9. Wind chill values as low as zero. South southwest wind around 6 mph.
Monday
Sunny, with a high near 30. Wind chill values as low as zero. South wind 3 to 6 mph.
Monday Night
Partly cloudy, with a low around 17. South wind around 6 mph.
Tuesday
Mostly sunny, with a high near 37. South wind around 5 mph becoming calm.
Tuesday Night
Mostly clear, with a low around 17. South wind around 6 mph.
Wednesday
Mostly sunny, with a high near 40.
Wednesday Night
Mostly clear, with a low around 21.
New Year's Day
Mostly sunny, with a high near 42.
Thursday Night
Mostly cloudy, with a low around 27.
Friday
A chance of snow showers. Partly sunny, with a high near 40.
Friday Night
A chance of snow showers. Mostly cloudy, with a low around 24.
Saturday
A chance of snow showers. Partly sunny, with a high near 36.
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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:
7:18 pm MST Dec 27, 2025
Forecast Valid:
8pm MST Dec 27, 2025-6pm MST Jan 3, 2026
 
Forecast Discussion
 
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