Heavy Great Lakes Snow through Friday; Watching Potential for Major Winter Storm Late Week into this Weekend

Heavy lake effect snow will continue in the Great Lakes into Wednesday before another storm brings a widespread general snow followed by another round of heavy lake effect snow. A wide-ranging winter storm will produce great swaths of heavy snow, sleet, and treacherous freezing rain from the southern Rockies/Plains and Mid-South starting Friday and shifting toward the East Coast through Sunday. Read More >

Hazardous Weather Conditions

Current conditions at

MAMMOTH AT YELLOWSTONE NATIONAL PARK (YLAW4)

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

NA

24°F

-4°C

Humidity 75%
Wind Speed NNW 2 MPH
Barometer NA
Dewpoint 17°F (-8°C)
Visibility NA
Last update 20 Jan 11:15 AM MST
Extended Forecast for

Mammoth WY

  • This Afternoon

    This Afternoon: A 20 percent chance of snow showers before 1pm.  Mostly cloudy, then gradually becoming sunny, with a steady temperature around 25. Northwest wind 7 to 9 mph.

    High: 25 °F

    Slight Chance
    Snow Showers

  • Tonight

    Tonight: Mostly clear, with a low around 12. South southeast wind 7 to 9 mph.

    Low: 12 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 32. South wind around 5 mph becoming calm.

    High: 32 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 12. South wind around 6 mph.

    Low: 12 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 32. South wind around 5 mph becoming calm.

    High: 32 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 10. North northwest wind around 5 mph becoming light and variable  in the evening.

    Low: 10 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 28. Light and variable wind becoming north northwest around 5 mph in the afternoon.

    High: 28 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 3.

    Low: 3 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 29.

    High: 29 °F

    Sunny

Detailed Forecast

This Afternoon
A 20 percent chance of snow showers before 1pm. Mostly cloudy, then gradually becoming sunny, with a steady temperature around 25. Northwest wind 7 to 9 mph.
Tonight
Mostly clear, with a low around 12. South southeast wind 7 to 9 mph.
Wednesday
Sunny, with a high near 32. South wind around 5 mph becoming calm.
Wednesday Night
Partly cloudy, with a low around 12. South wind around 6 mph.
Thursday
Mostly sunny, with a high near 32. South wind around 5 mph becoming calm.
Thursday Night
Partly cloudy, with a low around 10. North northwest wind around 5 mph becoming light and variable in the evening.
Friday
Mostly sunny, with a high near 28. Light and variable wind becoming north northwest around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 3.
Saturday
Sunny, with a high near 29.
Saturday Night
Partly cloudy, with a low around 11.
Sunday
Mostly sunny, with a high near 32.
Sunday Night
Partly cloudy, with a low around 17.
Monday
A slight chance of snow showers. Partly sunny, with a high near 35.
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ABOUT THIS FORECAST

 
Point Forecast:
Mammoth WY
 44.98°N 110.69°W (Elev. 5745 ft)
11:02 am MST Jan 20, 2026
12pm MST Jan 20, 2026-6pm MST Jan 26, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database