Lake-effect Snow and Whiteout Conditions in the Great Lakes Region; Below-average Temperatures in the East

Heavy lake-effect and lake-enhanced snow will persist downwind of the Great Lakes and produce some whiteout conditions that could cause difficult travel conditions. A coastal low will produce moderate to heavy snow over parts of southern and eastern New England into the afternoon. Below average temperatures are expected across the eastern U.S., particularly with chilly morning temperatures. Read More >

Hazardous Weather Conditions

Current conditions at

MAMMOTH AT YELLOWSTONE NATIONAL PARK (YLAW4)

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

NA

21°F

-6°C

Humidity 68%
Wind Speed SSE 3 MPH
Barometer NA
Dewpoint 12°F (-11°C)
Visibility NA
Last update 20 Jan 04:15 AM MST
Extended Forecast for

Mammoth WY

  • Today

    Today: A 30 percent chance of snow showers, mainly before 1pm.  Mostly cloudy, then gradually becoming sunny, with a high near 30. South wind 6 to 13 mph becoming north northwest in the morning. Winds could gust as high as 20 mph.

    High: 30 °F

    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

Today
A 30 percent chance of snow showers, mainly before 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 30. South wind 6 to 13 mph becoming north northwest in the morning. Winds could gust as high as 20 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)
4:17 am MST Jan 20, 2026
4am MST Jan 20, 2026-6pm MST Jan 26, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database